prof. dr. L. (Lex) Kaper


  • Faculty of Science
    Anton Pannekoek Institute of Astronomy
  • Visiting address
    Science Park A
    Science Park 904  Room number: C4.116
  • Postal address:
    Postbus  94249
    1090 GE  Amsterdam
  • L.Kaper@uva.nl
    T: 0205257474
    T: 0205257491

Profile

Lex Kaper is Associate Professor at the University of Amsterdam and Professor at the VU University Amsterdam.  He obtained his PhD (cum laude) at the University of Amsterdam in 1993, and worked for four years at the Headquarters of the European Southern Observatory in Garching near Munich (Germany). He returned at the Anton Pannekoek Institute for Astronomy in 1998 with a Royal Academy fellowship. Kaper is the NL-PI of X-shooter, the most powerful spectrograph in the world, mounted on the ESO Very Large Telescope in 2009. He is the NL-PI of MOSAIC, the multi-object spectrograph for the ESO Extremely Large Telescope (2024), the biggest eye on the sky. Kaper is the secretary of the Netherlands Committee for Astronomy and is member of the Council of the European Astronomical Society.

Research and teaching

His research group works on the formation, evolution and fate of massive stars. Recent research highlights include the first spectroscopic identification of young massive stars that are still on their way to become main-sequence stars, the detection of dust waves in Galactic H II regions, and the study of distant galaxies using gamma-ray bursts, the most powerful cosmic explosions. He has also been involved in the search for variations of the fundamental constants of nature. Kaper teaches the second-year bachelor course on Astrophysics and coordinates the Master’s course Observation Project where UvA students observe with the Mercator Telescope on La Palma.

Keywords 

Massive stars, star formation, stellar evolution, gamma-ray bursts, spectroscopy

2017

  • Christensen, L., Vergani, S. D., Schulze, S., Annau, N., Selsing, J., Fynbo, J. P. U., ... Worseck, G. (2017). Solving the conundrum of intervening strong Mg II absorbers towards gamma-ray bursts and quasars. Astronomy & Astrophysics, 608. DOI: 10.1051/0004-6361/201731382 
  • Covino, S., Wiersema, K., Fan, Y. Z., Toma, K., Higgins, A. B., Melandri, A., ... Wijers, R. A. M. J. (2017). Author Correction: The unpolarized macronova associated with the gravitational wave event GW 170817. Nature Astronomy, 1, 805-805. DOI: 10.1038/s41550-017-0319-6 
  • Covino, S., Wiersema, K., Fan, Y. Z., Toma, K., Higgins, A. B., Melandri, A., ... Wijers, R. A. M. J. (2017). The unpolarized macronova associated with the gravitational wave event GW 170817. Nature Astronomy, 1, 791-794. DOI: 10.1038/s41550-017-0285-z 
  • Abbott, B. P., et al., Kaper, L., Rowlinson, A., Wijers, R. A. M. J., Balzer, A., ... Shulevski, A. (2017). Multi-messenger Observations of a Binary Neutron Star Merger. Astrophysical Journal Letters, 848(2), [L12]. DOI: 10.3847/2041-8213/aa91c9 
  • Cox, N. L. J., Cami, J., Farhang, A., Smoker, J., Monreal-Ibero, A., Lallement, R., ... Spaans, M. (2017). The ESO Diffuse Interstellar Bands Large Exploration Survey (EDIBLES) . I. Project description, survey sample, and quality assessment. Astronomy & Astrophysics, 606. DOI: 10.1051/0004-6361/201730912 
  • Hyde, E. A., Russell, D. M., Ritter, A., Filipović, M. D., Kaper, L., Grieve, K., & O'Brien, A. N. (2017). LMC X-1: A New Spectral Analysis of the O-star in the Binary and Surrounding Nebula. Publications of the Astronomical Society of the Pacific, 129(979), 94201. DOI: 10.1088/1538-3873/aa7407 
  • Ramirez Tannus, M. C., Kaper, L., de Koter, A., Tramper, F., Bik, A., Ellerbroek, L. E., ... Sana, H. (2017). Massive pre-main-sequence stars in M17. Astronomy & Astrophysics, 604, [A78]. DOI: 10.1051/0004-6361/201629503 
  • Hernandez, S., Larsen, S., Trager, S., Groot, P., & Kaper, L. (2017). Chemical abundances of two extragalactic young massive clusters. Astronomy & Astrophysics, 603. DOI: 10.1051/0004-6361/201730550 
  • Wehres, N., Ochsendorf, B. B., Tielens, A. G. G. M., Cox, N. L. J., Kaper, L., Bally, J., & Snow, T. P. (2017). Medium-resolution échelle spectroscopy of the Red Square Nebula, MWC 922. Astronomy & Astrophysics, 601, [A69]. DOI: 10.1051/0004-6361/201628723  [details] 
  • Sana, H., Ramírez-Tannus, M. C., de Koter, A., Kaper, L., Tramper, F., & Bik, A. (2017). A dearth of short-period massive binaries in the young massive star forming region M 17. Evidence for a large orbital separation at birth? Astronomy & Astrophysics, 599. DOI: 10.1051/0004-6361/201630087 

2016

  • Ubachs, W., Bagdonaite, J., Salumbides, E. J., Murphy, M. T., & Kaper, L. (2016). Colloquium: Search for a drifting proton-electron mass ratio from H2. Reviews of Modern Physics, 88(2), 21003. DOI: 10.1103/RevModPhys.88.021003 
  • Wade, G. A., Neiner, C., Alecian, E., Grunhut, J. H., Petit, V., Batz, B. D., ... Yakunin, I. (2016). The MiMeS survey of magnetism in massive stars: introduction and overview. Monthly Notices of the Royal Astronomical Society, 456(1), 2-22. DOI: 10.1093/mnras/stv2568 

2015

  • Ellerbroek, L. E., Benisty, M., Kraus, S., Perraut, K., Kluska, J., de Bouquin, J. B., ... Russell, R. W. (2015). A resolved, au-scale gas disk around the B[e] star HD 50138. Astronomy & Astrophysics, 573, A77. DOI: 10.1051/0004-6361/201424143  [details] 
  • Hartoog, O. E., Fynbo, J. P. U., Kaper, L., De Cia, A., & Bagdonaite, J. (2015). Galaxy counterparts of metal-rich damped Lyα absorbers: the case of J205922.4-052842. Monthly Notices of the Royal Astronomical Society, 447(3), 2738-2752. DOI: 10.1093/mnras/stu2578  [details] 
  • Hartoog, O. E., Malesani, D., Fynbo, J. P. U., Goto, T., Krühler, T., Vreeswijk, P. M., ... Aghanim, N. (2015). VLT/X-Shooter spectroscopy of the afterglow of the Swift GRB 130606A. Chemical abundances and reionisation at z ~ 6. Astronomy & Astrophysics, 580, [A139]. DOI: 10.1051/0004-6361/201425001  [details] 
  • Tramper, F., Sana, H., Fitzsimons, N. E., de Koter, A., Kaper, L., Mahy, L., & Moffat, A. (2015). The mass of the very massive binary WR21a. Monthly Notices of the Royal Astronomical Society, 455(2), 1275-1281. DOI: 10.1093/mnras/stv2373  [details] 
  • Tramper, F., Straal, S. M., Gräfener, G., Kaper, L., de Koter, A., Langer, N., ... Vink, J. S. (2015). The properties of single WO stars. Proceedings of the National Academy of Sciences of the United States of America, 307, 144-145. DOI: 10.1017/S1743921314006590  [details] 
  • Tramper, F., Straal, S. M., Sanyal, D., Sana, H., de Koter, A., Gräfener, G., ... Kaper, L. (2015). Massive stars on the verge of exploding: the properties of oxygen sequence Wolf-Rayet stars. Astronomy & Astrophysics, 581, [A110]. DOI: 10.1051/0004-6361/201425390  [details] 
  • Friis, M., De Cia, A., Krühler, T., Fynbo, J. P. U., Ledoux, C., Vreeswijk, P. M., ... Vergani, S. D. (2015). The warm, the excited, and the molecular gas: GRB 121024A shining through its star-forming galaxy. Monthly Notices of the Royal Astronomical Society, 451(1), 167-183. DOI: 10.1093/mnras/stv960  [details] 
  • Japelj, J., Covino, S., Gomboc, A., Vergani, S. D., Goldoni, P., Selsing, J., ... Wijers, R. A. M. J. (2015). Spectrophotometric analysis of gamma-ray burst afterglow extinction curves with X-Shooter. Astronomy & Astrophysics, 579, [A74]. DOI: 10.1051/0004-6361/201525665  [details] 
  • Krühler, T., Malesani, D., Fynbo, J. P. U., Hartoog, O. E., Hjorth, J., Jakobsson, P., ... Xu, D. (2015). GRB hosts through cosmic time. VLT/X-Shooter emission-line spectroscopy of 96 γ-ray-burst-selected galaxies at 0.1 <z < 3.6. Astronomy & Astrophysics, 581, [A125]. DOI: 10.1051/0004-6361/201425561  [details] 

2014

  • Cox, N. L. J., Cami, J., Kaper, L., Ehrenfreund, P., Foing, B. H., Ochsendorf, B. B., ... Salama, F. (2014). VLT/X-Shooter survey of near-infrared diffuse interstellar bands. Astronomy & Astrophysics, 569, A117. DOI: 10.1051/0004-6361/201323061  [details] 
  • Ellerbroek, L. E., Podio, L., Dougados, C., Cabrit, S., Sitko, M. L., Sana, H., ... Grindlay, J. (2014). Relating jet structure to photometric variability: the Herbig Ae star HD 163296. Astronomy & Astrophysics, 563, A87. DOI: 10.1051/0004-6361/201323092  [details] 
  • Ochsendorf, B. B., Verdolini, S., Cox, N. L. J., Berné, O., Kaper, L., & Tielens, A. G. G. M. (2014). Radiation-pressure-driven dust waves inside bursting interstellar bubbles. Astronomy & Astrophysics, 566, A75. DOI: 10.1051/0004-6361/201423545  [details] 
  • Ochsendorf, B. B., Cox, N. L. J., Krijt, S., Salgado, F., Berné, O., Bernard, J. P., ... Tielens, A. G. G. M. (2014). Blowing in the wind: The dust wave around σ Orionis AB. Astronomy & Astrophysics, 563, A65. DOI: 10.1051/0004-6361/201322873  [details] 
  • Tramper, F., Sana, H., de Koter, A., Kaper, L., & Ramírez-Agudelo, O. H. (2014). The properties of ten O-type stars in the low-metallicity galaxies IC 1613, WLM, and NGC 3109. Astronomy & Astrophysics, 572, [A36]. DOI: 10.1051/0004-6361/201424312  [details] 
  • Cirasuolo, M., et al., . U., Kaper, L., & Lemasle, B. (2014). MOONS: the Multi-Object Optical and Near-infrared Spectrograph for the VLT. Proceedings of SPIE, the International Society for Optical Engineering, 9147, 0N. DOI: 10.1117/12.2056012  [details] 
  • D'Elia, V., Fynbo, J. P. U., Goldoni, P., Covino, S., de Ugarte Postigo, A., Ledoux, C., ... Xu, D. (2014). VLT/X-shooter spectroscopy of the GRB 120327A afterglow. Astronomy & Astrophysics, 564, A38. DOI: 10.1051/0004-6361/201323057  [details] 
  • Evans, C. J., Puech, M., Barbuy, B., Bonifacio, P., Cuby, J. G., Guenther, E., ... Ziegler, B. (2014). Science case and requirements for the MOSAIC concept for a multi-object spectrograph for the European Extremely Large Telescope. Proceedings of SPIE, the International Society for Optical Engineering, 9147, 96. DOI: 10.1117/12.2055857  [details] 
  • Fynbo, J. P. U., Krühler, T., Leighly, K., Ledoux, C., Vreeswijk, P. M., Schulze, S., ... Zafar, T. (2014). The mysterious optical afterglow spectrum of GRB 140506A at z = 0.889. Astronomy & Astrophysics, 572, [A12]. DOI: 10.1051/0004-6361/201424726  [details] 
  • Hammer, F., Barbuy, B., Cuby, J. G., Kaper, L., Morris, S., Evans, C. J., ... Disseau, K. (2014). MOSAIC at the E-ELT: A multi-object spectrograph for astrophysics, IGM and cosmology. Proceedings of SPIE, the International Society for Optical Engineering, 9147, 27. DOI: 10.1117/12.2055148  [details] 
  • Levan, A. J., Tanvir, N. R., Starling, R. L. C., Wiersema, K., Page, K. L., Perley, D. A., ... Zauderer, B. A. (2014). A New Population of Ultra-long Duration Gamma-Ray Bursts. Astrophysical Journal, 781(1), 13. DOI: 10.1088/0004-637X/781/1/13  [details] 
  • Meyer, D. M-A., Mackey, J., Langer, N., Gvaramadze, V. V., Mignone, A., Izzard, R. G., & Kaper, L. (2014). Models of the circumstellar medium of evolving, massive runaway stars moving through the Galactic plane. Monthly Notices of the Royal Astronomical Society, 444(3), 2754-2775. DOI: 10.1093/mnras/stu1629  [details] 
  • Pita, S., Goldoni, P., Boisson, C., Lenain, J-P., Punch, M., Gérard, L., ... Sol, H. (2014). Spectroscopy of high-energy BL Lacertae objects with X-shooter on the VLT. Astronomy & Astrophysics, 565, A12. DOI: 10.1051/0004-6361/201323071  [details] 
  • Schulze, S., et al., . U., Ellerbroek, L. E., Kaper, L., & Hartoog, O. E. (2014). GRB 120422A/SN 2012bz: Bridging the gap between low- and high-luminosity gamma-ray bursts. Astronomy & Astrophysics, 566, A102. DOI: 10.1051/0004-6361/201423387  [details] 
  • Sparre, M., Hartoog, O. E., Krühler, T., Fynbo, J. P. U., Watson, D. J., Wiersema, K., ... Wijers, R. A. M. J. (2014). The Metallicity and Dust Content of a Redshift 5 Gamma-Ray Burst Host Galaxy. Astrophysical Journal, 785(2), 150. DOI: 10.1088/0004-637X/785/2/150  [details] 
  • de Ugarte Postigo, A., Thöne, C. C., Rowlinson, A., García-Benito, R., Levan, A. J., Gorosabel, J., ... Wijers, R. A. M. J. (2014). Spectroscopy of the short-hard GRB 130603B: The host galaxy and environment of a compact object merger. Astronomy & Astrophysics, 563, A62. DOI: 10.1051/0004-6361/201322985  [details] 

2013

  • Ellerbroek, L. E., Podio, L., Kaper, L., Sana, H., Huppenkothen, D., de Koter, A., & Monaco, L. (2013). The outflow history of two Herbig-Haro jets in RCW 36: HH 1042 and HH 1043. Astronomy & Astrophysics, 551, 5. DOI: 10.1051/0004-6361/201220635  [details] 
  • Ellerbroek, L. E., Bik, A., Kaper, L., Maaskant, K. M., Paalvast, M., Tramper, F., ... Balog, Z. (2013). RCW36: characterizing the outcome of massive star formation. Astronomy & Astrophysics, 558, A102. DOI: 10.1051/0004-6361/201321752  [details] 
  • Hartoog, O. E., Wiersema, K., Vreeswijk, P. M., Kaper, L., Tanvir, N. R., Savaglio, S., ... Wijers, R. A. M. J. (2013). The host-galaxy response to the afterglow of GRB 100901A. Monthly Notices of the Royal Astronomical Society, 430(4), 2739-2754. DOI: 10.1093/mnras/stt078  [details] 
  • Henrichs, H. F., de Jong, J. A., Verdugo, E., Schnerr, R. S., Neiner, C., Donati, J-F., ... Rygl, K. L. J. (2013). Discovery of the magnetic field in the pulsating B star β Cephei. Astronomy & Astrophysics, 555, A46. DOI: 10.1051/0004-6361/201321584  [details] 
  • Lemasle, B., François, P., Genovali, K., Kovtyukh, V. V., Bono, G., Inno, L., ... Romaniello, M. (2013). Galactic abundance gradients from Cepheids. α and heavy elements in the outer disk. Astronomy & Astrophysics, 558, A31. DOI: 10.1051/0004-6361/201322115  [details] 
  • Sana, H., van Boeckel, T., Tramper, F., Ellerbroek, L. E., de Koter, A., Kaper, L., ... Gies, D. R. (2013). R144 revealed as a double-lined spectroscopic binary. Monthly Notices of the Royal Astronomical Society. Letters, 432(1), L26-L30. DOI: 10.1093/mnrasl/slt029  [details] 
  • Tramper, F., Gräfener, G., Hartoog, O., Sana, H., de Koter, A., Vink, J. S., ... de Mink, S. E. (2013). On the nature of WO stars: a quantitative analysis of the WO3 star DR1 in IC 1613. Astronomy & Astrophysics, 559, A72. DOI: 10.1051/0004-6361/201322155  [details] 
  • Boley, P. A., Linz, H., van Boekel, R., Henning, T., Feldt, M., Kaper, L., ... Zinnecker, H. (2013). The VLTI/MIDI survey of massive young stellar objects: Sounding the inner regions around intermediate- and high-mass young stars using mid-infrared interferometry. Astronomy & Astrophysics, 558, A24. DOI: 10.1051/0004-6361/201321539  [details] 
  • Krühler, T., Ledoux, C., Fynbo, J. P. U., Vreeswijk, P. M., Schmidl, S., Malesani, D., ... Xu, D. (2013). Molecular hydrogen in the damped Lyman α system towards GRB 120815A at z = 2.36. Astronomy & Astrophysics, 557, A18. DOI: 10.1051/0004-6361/201321772  [details] 
  • Starkenburg, E., Hill, V., Tolstoy, E., François, P., Irwin, M. J., Boschman, L., ... Kaper, L. (2013). The extremely low-metallicity tail of the Sculptor dwarf spheroidal galaxy. Astronomy & Astrophysics, 549, A88. DOI: 10.1051/0004-6361/201220349  [details] 
  • Thöne, C. C., Fynbo, J. P. U., Goldoni, P., Postigo de Ugarte, A., Campana, S., Vergani, S. D., ... Wijers, R. A. M. J. (2013). GRB 100219A with X-shooter - abundances in a galaxy at z =4.7. Monthly Notices of the Royal Astronomical Society, 428(4), 3590-3606. DOI: 10.1093/mnras/sts303  [details] 
  • Xu, D., de Ugarte Postigo, A., Leloudas, G., Krühler, T., Cano, Z., Hjorth, J., ... Zou, Y. C. (2013). Discovery of the Broad-lined Type Ic SN 2013cq Associated with the Very Energetic GRB 130427A. Astrophysical Journal, 776(2), 98. DOI: 10.1088/0004-637X/776/2/98  [details] 

2012

  • Hartoog, O. E., Sana, H., de Koter, A., & Kaper, L. (2012). First Very Large Telescope/X-shooter spectroscopy of early-type stars outside the Local Group. Monthly Notices of the Royal Astronomical Society, 422(1), 367-378. DOI: 10.1111/j.1365-2966.2012.20615.x  [details] 
  • Kaur, R., Kaper, L., Ellerbroek, L. E., Russell, D. M., Altamirano, D., Wijnands, R., ... Kuulkers, E. (2012). Very large telescope/X-shooter spectroscopy of the candidate black hole X-ray binary MAXI J1659-152 in outburst. Astrophysical Journal Letters, 746(2), L23. DOI: 10.1088/2041-8205/746/2/L23  [details] 
  • Wiersema, K., Curran, P., Krühler, T., Melandri, A., Rol, E., Starling, R. L. C., ... Vergani, S. D. (2012). Detailed optical and near-infrared polarimetry, spectroscopy and broad-band photometry of the afterglow of GRB 091018: polarization evolution. Monthly Notices of the Royal Astronomical Society, 426(1), 2-22. DOI: 10.1111/j.1365-2966.2012.20943.x  [details] 
  • van der Horst, A. J., Kouveliotou, C., Gorgone, N. M., Kaneko, Y., Baring, M. G., Guiriec, S., ... Wijers, R. A. M. J. (2012). SGR J1550-5418 Bursts Detected with the Fermi Gamma-Ray Burst Monitor during its Most Prolific Activity. Astrophysical Journal, 749(2), [122]. DOI: 10.1088/0004-637X/749/2/122  [details] 
  • Bagdonaite, J., Murphy, M. T., Kaper, L., & Ubachs, W. (2012). Constraint on a variation of the proton-to-electron mass ratio from H2 absorption towards quasar Q2348-011. Monthly Notices of the Royal Astronomical Society, 421(1), 419-425. DOI: 10.1111/j.1365-2966.2011.20319.x  [details] 
  • Bufano, F., Pian, E., Sollerman, J., Benetti, S., Pignata, G., Valenti, S., ... Wijers, R. A. M. J. (2012). The Highly Energetic Expansion of SN 2010bh Associated with GRB 100316D. Astrophysical Journal, 753(1), 67. DOI: 10.1088/0004-637X/753/1/67  [details] 
  • Cirasuolo, M., Afonso, J., Bender, R., Bonifacio, P., Evans, C., Kaper, L., ... Wright, G. (2012). MOONS: a multi-object optical and near-infrared spectrograph for the VLT. Proceedings of SPIE, the International Society for Optical Engineering, 8446, 0S. DOI: 10.1117/12.925871  [details] 
  • Evans, C. J., Barbuy, B., Bonifacio, P., Chemla, F., Cuby, J. G., Dalton, G. B., ... Yang, Y. (2012). Multi-object spectroscopy with the European ELT: scientific synergies between EAGLE and EVE. Proceedings of SPIE, the International Society for Optical Engineering, 8446, 7K. DOI: 10.1117/12.924819  [details] 
  • Grunhut, J. H., Wade, G. A., Sundqvist, J. O., ud-Doula, A., Neiner, C., Ignace, R., ... Ubaud, S. (2012). Investigating the spectroscopic, magnetic and circumstellar variability of the O9 subgiant star HD 57682. Monthly Notices of the Royal Astronomical Society, 426(3), 2208-2227. DOI: 10.1111/j.1365-2966.2012.21799.x  [details] 
  • Oliva, E., Diolaiti, E., Garilli, B., Gratton, R., Lorenzetti, D., Schipani, P., ... Vitali, F. (2012). The design of the MOONS-VLT spectrometer. Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, 8446, 187. DOI: 10.1117/12.925309  [details] 

2011

  • Ellerbroek, L., Kaper, L., Bik, A., de Koter, A., Horrobin, M., Puga, E., ... Waters, L. B. F. M. (2011). The Intermediate-mass Young Stellar Object 08576nr292: discovery of a disk-jet system. Astrophysical Journal Letters, 732. DOI: 10.1088/2041-8205/732/1/L9  [details] 
  • Kaper, L., Ellerbroek, L. E., Ochsendorf, B. B., & Caballero Pouroutidou, R. N. (2011). Studying the formation of massive stars with VLT/X-shooter. Astronomische Nachrichten, 332(3), 232-237. DOI: 10.1002/asna.201111524  [details] 
  • Lin, L., Kouveliotou, C., Baring, M. G., van der Horst, A. J., Guiriec, S., Woods, P. M., ... Wilson-Hodge, C. (2011). Fermi/Gamma-ray burst monitor observations of SGR J0501+4516 bursts. Astrophysical Journal, 739. DOI: 10.1088/0004-637X/739/2/87  [details] 
  • Maaskant, K. M., Bik, A., Waters, L. B. F. M., Kaper, L., Henning, T., Puga, E., ... Kainulainen, J. (2011). Sequential star formation in IRAS 06084-0611 (GGD 12-15): from intermediate-mass to high-mass stars. Astronomy & Astrophysics, 531. DOI: 10.1051/0004-6361/201116743  [details] 
  • Starling, R. L. C., Wiersema, K., Levan, A. J., Sakamoto, T., Bersier, D., Goldoni, P., ... Woosley, S. E. (2011). Discovery of the nearby long, soft GRB 100316D with an associated supernova. Monthly Notices of the Royal Astronomical Society, 411(4), 2792-2803. DOI: 10.1111/j.1365-2966.2010.17879.x  [details] 
  • Tramper, F., Sana, H., de Koter, A., & Kaper, L. (2011). On the mass-loss rate of massive stars in the low-metallicity galaxies IC 1613, WLM, and NGC 3109. Astrophysical Journal Letters, 741. DOI: 10.1088/2041-8205/741/1/L8  [details] 
  • Fynbo, J. P. U., Ledoux, C., Noterdaeme, P., Christensen, L., Møller, P., Durgapal, A. K., ... Zafar, T. (2011). Galaxy counterparts of metal-rich damped Lyα absorbers: II. A solar-metallicity and dusty DLA at zabs= 2.58. Monthly Notices of the Royal Astronomical Society, 413, 2481-2488. DOI: 10.1111/j.1365-2966.2011.18318.x  [details] 
  • Ochsendorf, B. B., Ellerbroek, L. E., Chini, R., Hartoog, O. E., Hoffmeister, V., Waters, L. B. F. M., & Kaper, L. (2011). First firm spectral classification of an early-B pre-main-sequence star: B275 in M 17. Astronomy & Astrophysics, 536. DOI: 10.1051/0004-6361/201118089  [details] 
  • Sande, J., Kriek, M., Franx, M., Dokkum, P. G., Bezanson, R., Whitaker, K. E., ... Kaper, L. (2011). The stellar velocity dispersion of a compact massive galaxy at z = 1.80 using X-Shooter: confirmation of the evolution in the mass-size and mass-dispersion relations. Astrophysical Journal Letters, 736. DOI: 10.1088/2041-8205/736/1/L9  [details] 
  • Sparre, M., Sollerman, J., Fynbo, J. P. U., Malesani, D., Goldoni, P., de Ugarte Postigo, A., ... Wijers, R. A. M. J. (2011). Spectroscopic evidence for SN 2010ma associated with GRB 101219B. Astrophysical Journal Letters, 735. DOI: 10.1088/2041-8205/735/1/L24  [details] 
  • Taylor, W. D., Evans, C. J., Sana, H. A. A., Walborn, N. R., de Mink, S. E., Stroud, V. E., ... Vink, J. S. (2011). The VLT-FLAMES Tarantula Survey: II. R139 revealed as a massive binary system. Astronomy & Astrophysics, 530. DOI: 10.1051/0004-6361/201116785  [details] 
  • Vergani, S. D., Flores, H., Covino, S., Fugazza, D., Gorosabel, J., Levan, A. J., ... Wijers, R. A. M. J. (2011). GRB 091127/SN 2009nz and the VLT/X-shooter spectroscopy of its host galaxy: probing the faint end of the mass-metallicity relation. Astronomy & Astrophysics, 535. DOI: 10.1051/0004-6361/201117726  [details] 
  • Vernet, J., Dekker, H., D'Odorico, S., Kaper, L., Kjaergaard, P., Hammer, F., ... Zacchei, A. (2011). X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope. Astronomy & Astrophysics, 536. DOI: 10.1051/0004-6361/201117752  [details] 
  • Vos, D. A. I., Cox, N. L. J., Kaper, L., Spaans, M., & Ehrenfreund, P. (2011). Diffuse interstellar bands in Upper Scorpius: probing variations in the DIB spectrum due to changing environmental conditions. Astronomy & Astrophysics, 533. DOI: 10.1051/0004-6361/200809746  [details] 
  • van Weerdenburg, F., Murphy, M. T., Malec, A. L., Kaper, L., & Ubachs, W. (2011). First constraint on cosmological variation of the proton-to-electron mass ratio from two independent telescopes. Physical Review Letters, 106. DOI: 10.1103/PhysRevLett.106.180802  [details] 

2010

  • Bik, A., Puga, E., Waters, L. B. F. M., Horrobin, M., Henning, T., Vasyunina, T., ... Waelkens, C. (2010). Sequential star formation in RCW 34: a spectroscopic census of the stellar content of high-mass star-forming regions. Astrophysical Journal, 713(2), 883-899. DOI: 10.1088/0004-637X/713/2/883  [details] 
  • D'Elia, V., Fynbo, J. P. U., Covino, S., Goldoni, P., Jakobsson, P., Matteucci, F., ... Tanvir, N. R. (2010). VLT/X-shooter spectroscopy of the GRB 090926A afterglow. Astronomy & Astrophysics, 523, A36. DOI: 10.1051/0004-6361/201015216  [details] 
  • Fynbo, J. P. U., Laursen, P., Ledoux, C., Møller, P., Durgapal, A. K., Goldoni, P., ... Zafar, T. (2010). Galaxy counterparts of metal-rich damped Lyα absorbers - I. The case of the z= 2.35 DLA towards Q 2222−0946. Monthly Notices of the Royal Astronomical Society, 408(4), 2128-2136. DOI: 10.1111/j.1365-2966.2010.17294.x  [details] 
  • Hammer, F., Kaper, L., & Dalton, G. (2010). OPTIMOS-EVE: a fibre-fed optical-near-infrared multi-object spectrograph for the E-ELT. The Messenger, (140), 36-37. [details] 
  • Malec, A. L., Buning, R., Murphy, M. T., Milutinovic, N., Ellison, S. L., Prochaska, J. X., ... Ubachs, W. (2010). Keck telescope constraint on cosmological variation of the proton-to-electron mass ratio. Monthly Notices of the Royal Astronomical Society, 403(3), 1541-1555. DOI: 10.1111/j.1365-2966.2009.16227.x  [details] 
  • de Ugarte Postigo, A., Goldoni, P., Thöne, C. C., Vergani, S. D., D'Elia, V., Piranomonte, S., ... Vernet, J. (2010). GRB 090313: X-shooter's first shot at a gamma-ray burst. Astronomy & Astrophysics, 513, A42. DOI: 10.1051/0004-6361/200913113  [details] 

2009

  • Henrichs, H. F., Schnerr, R. S., de Jong, J. A., Kaper, L., Donati, J. F., & Catala, C. (2009). Search for the magnetic field of the O7.5 III star ξ Persei. Proceedings of the International Astronomical Union, 4, 383-384. DOI: 10.1017/S1743921309030774  [details] 
  • Kaper, L., D'Odorico, S., Hammer, F., Pallavicini, R., Kjaergaard Rasmussen, P., Dekker, H. A., ... Zerbi, F. (2009). X-shooter: A medium-resolution, wide-band spectrograph for the VLT. Astrophysics and Space Science Proceedings, 319-324. DOI: 10.1007/978-1-4020-9190-2_53  [details] 
  • Kouwenhoven, M. B. N., Brown, A. G. A., Goodwin, S. P., Portegies Zwart, S. F., & Kaper, L. (2009). Exploring the consequences of pairing algorithms for binary stars. Astronomy & Astrophysics, 493(3), 979-1016. DOI: 10.1051/0004-6361:200810234  [details] 
  • Caballero-Nieves, S. M., Gies, D. R., Bolton, C. T., Hadrava, P., Herrero, A., Hillwig, T. C., ... McSwain, M. V. (2009). The ultraviolet spectrum and physical properties of the mass donor star in HD 226868 = Cygnus X-1. Astrophysical Journal, 701(2), 1895-1905. DOI: 10.1088/0004-637X/701/2/1895  [details] 

2008

  • Bik, A., Kaper, L., Hanson, M. M., & Waters, L. B. F. M. (2008). K-band spectroscopy of deeply embedded, young OB stars. Astronomical Society of the Pacific conference series, 388, 143-144. [details] 
  • Bik, A., Lenorzer, A., Thi, W. F., Puga Antolín, E., Waters, L. B. F. M., Kaper, L., & Martín-Hernández, L. N. (2008). An infrared view of (candidate accretion) disks around massive young stars. Astronomical Society of the Pacific conference series, 387, 78-85. [details] 
  • Kouwenhoven, M. B. N., Brown, A. G. A., Goodwin, S. P., Portegies Zwart, S. F., & Kaper, L. (2008). Pairing mechanisms for binary stars. Astronomische Nachrichten, 329(9-10), 984-987. DOI: 10.1002/asna.200811061  [details] 
  • Gies, D. R., Bolton, C. T., Blake, R. M., Caballero-Nieves, S. M., Crenshaw, D. M., Hadrava, P., ... McSwain, M. V. (2008). Stellar wind variations during the X-ray high and low states of Cygnus X-1. Astrophysical Journal, 678(2), 1237-1247. DOI: 10.1086/586690  [details] 
  • Navarro, R., Elswijk, E., Tromp, N., ter Horst, R., Horrobin, M., Vernet, J., ... Kaper, L. (2008). X-shooter near-IR spectrograph arm realisation. Proceedings of SPIE, the International Society for Optical Engineering, 7014, 70141Y. DOI: 10.1117/12.789778  [details] 
  • Puga, E., Bik, A., Waters, L. B. F. M., Henning, T., Kaper, L., van den Ancker, M., ... Feldt, M. (2008). Probing the early evolution of young high-mass stars. Astronomical Society of the Pacific conference series, 387, 331-337. [details] 
  • Vernet, J., Kerber, F., Saitta, F., Mainieri, V., D'Odorico, S., Lidman, C., ... Royer, F. (2008). Building up a database of spectro-photometric standard stars from the UV to the near-IR: A status report. Proceedings of SPIE, the International Society for Optical Engineering, 7016, 70161G. DOI: 10.1117/12.788676  [details] 
  • Williams, S. J., Gies, D. R., Henry, T. J., Orosz, J. A., McSwain, M. V., Hillwig, T. C., ... Kaper, L. (2008). Dynamical masses for the Large Magellanic Cloud massive binary system [L72] LH 54-425. Astrophysical Journal, 682(1), 492-498. DOI: 10.1086/589687  [details] 

2017

  • Kaper, L., Fynbo, J. P. U., Pugliese, V., & van Rest, D. (2017). The VLT/X-shooter GRB afterglow legacy survey. Proceedings of the International Astronomical Union, 329, 410-410. DOI: 10.1017/S1743921317003428 
  • Ramírez-Tannus, M. C., Kaper, L., de Koter, A., Tramper, F., Sana, H., Ramírez-Agudelo, O. H., ... Ochsendorf, B. B. (2017). Massive pre-main-sequence stars in M17. Proceedings of the International Astronomical Union, 329, 439-439. DOI: 10.1017/S1743921317002897 

2016

  • Evans, C. J., Puech, M., Rodrigues, M., Barbuy, B., Cuby, J-G., Dalton, G., ... Morris, T. J. (2016). Science requirements and trade-offs for the MOSAIC instrument for the European ELT. Proceedings of the SPIE, 9908. DOI: 10.1117/12.2231675 
  • Hammer, F., Morris, S., Kaper, L., Barbuy, B., Cuby, J. G., Roth, M., ... Rodrigues, M. (2016). The E-ELT multi-object spectrograph: latest news from MOSAIC. Proceedings of the SPIE, 9908, 990824. DOI: 10.1117/12.2232427 

2015

  • Martins, F., Bergemann, M., Bestenlehner, J. M., Crowther, P. A., Hamann, W. R., Najarro, F., ... Kaper, L. (2015). SpS5 - II. Stellar and wind parameters. Proceedings of the International Astronomical Union, 10(H16), 420-428. DOI: 10.1017/S1743921314011788  [details] 
  • Vink, J. S., Heger, A., Krumholz, M. R., Puls, J., Banerjee, S., Castro, N., ... Zhang, Y. (2015). Very Massive Stars in the local Universe. Proceedings of the International Astronomical Union, 10(H16), 51-79. DOI: 10.1017/S1743921314004657  [details] 

2014

  • Cox, N. L. J., Cami, J., Kaper, L., Foing, B. H., Ehrenfreund, P., Ochsendorf, B. B., ... Salama, F. (2014). X-Shooter Survey of Near-Infrared DIBs. Proceedings of the International Astronomical Union, 9(S297), 103-105. DOI: 10.1017/S1743921313015664  [details] 
  • Hartoog, O. E., Malesani, D., Sanchez-Ramirez, R., de Ugarte Postigo, A., Levan, A. J., Fynbo, J. P. U., ... Kaper, L. (2014). GRB 140622A: VLT/X-shooter redshift. GRB Coordinates Network, Circular Service, 16437(1). [details] 
  • Kaper, L. (2014). The Promise of Recent and Future Observatories and Instruments. Proceedings of the International Astronomical Union, 9(S297), 389-398. DOI: 10.1017/S1743921313016190  [details] 

2013

  • Hartoog, O. E., Xu, D., Malesani, D., Tanvir, N. R., Fynbo, J. P. U., Kaper, L., & D'Elia, V. (2013). GRB 131117A: VLT/X-shooter redshift. GRB Coordinates Network, Circular Service, 15494. [details] 
  • Flores, H., Covino, S., Xu, D., Kruehler, T., Fynbo, J., Milvang-Jensen, B., ... Wiersema, K. (2013). GRB 130427A: VLT/X-shooter redshift confirmation. GRB Coordinates Network, Circular Service, 14491(1). [details] 
  • Klaassen, P. D., Mottram, J. C., Longmore, S. N., Fuller, G. A., van der Tak, F. F. S., & Kaper, L. (2013). High-mass star formation. Astronomy & Geophysics, 54(3), 3.33. DOI: 10.1093/astrogeo/att083  [details] 
  • Wehres, N., Ochsendorf, B., Bally, J., Snow, T., Bierbaum, V., Cox, N. L. J., ... Tielens, A. G. G. M. (2013). Search for DIBs in Emission: MWC 922 - The Red Square Nebula. Proceedings of the International Astronomical Union, 9(S297), 226-228. DOI: 10.1017/S1743921313015913  [details] 
  • Xu, D., Malesani, D., Kruehler, T., Fynbo, J. P. U., Perley, D. A., Goldoni, P., ... Tanvir, N. R. (2013). GRB 111123A: Keck-I host detection and VLT/X-shooter redshift. GRB Coordinates Network, Circular Service, 14273(1). [details] 
  • Xu, D., Malesani, D., Schulze, S., Fynbo, J. P. U., D'Elia, V., Goldoni, P., ... Wiersema, K. (2013). GRB 130606A: VLT/X-shooter redshift confirmation. GRB Coordinates Network, Circular Service, 14816(1). [details] 
  • Xu, D., de Ugarte Postigo, A., Malesani, D., Vreeswijk, P., D'Elia, V., Fynbo, J. P. U., ... Vergani, S. D. (2013). GRB 130701A: VLT/X-shooter redshift. GRB Coordinates Network, Circular Service, 14956(1). [details] 

2012

  • Ellerbroek, L., Kaper, L., Bik, A., Maaskant, K. M., & Podio, L. (2012). The Star Formation History of RCW 36. Astronomical Society of the Pacific conference series, 464, 351-360. [details] 
  • Sana, H., de Koter, A., Garcia, M., Hartoog, O., Kaper, L., Tramper, F., ... Castro, N. (2012). X-shooter Spectroscopy of Massive Stars in the Local Group and Beyond. The Messenger, 148, 33-37. [details] 
  • D'Avanzo, P., Milvang-Jensen, B., Vreeswijk, P., Tanvir, N., Malesani, D., Goldoni, P., ... Fynbo, J. (2012). GRB 120311A: VLT/X-shooter observations. GRB Coordinates Network, Circular Service, 13051, 1. [details] 
  • Kruehler, T., Tanvir, N. R., de Ugarte Postigo, A., Malesani, D., Fynbo, J., Melandri, A., ... Kaper, L. (2012). GRB 121027A: x-shooter redshift confirmation. GRB Coordinates Network, Circular Service, 13930, 1. [details] 
  • Sanchez-Ramirez, R., de Ugarte Postigo, A., Kruehler, T., Milvang-Jensen, B., Fynbo, J. P. U., Tanvir, N., ... Flores, H. (2012). GRB 121201A: x-shooter redshift. GRB Coordinates Network, Circular Service, 14035, 1. [details] 

2011

  • Cirasuolo, M., Afonso, J., Bender, R., Bonifacio, P., Evans, C., Kaper, L., ... Vanzi, L. (2011). MOONS: The Multi-Object Optical and Near-infrared Spectrograph. The Messenger, 145, 11-13. [details] 
  • Piranomonte, S., Vergani, S. D., Malesani, D., Fynbo, J. P. U., Wiersema, K., & Kaper, L. (2011). GRB110715A: VLT redshift. GRB Coordinates Network, Circular Service, 1216.
  • Ubachs, W., Bagdonaite, J., Murphy, M. T., Buning, R., Kaper, L., Martins, C., & Molaro, P. (2011). Search for Cosmological µ-Variation from High-Redshift H2 Absorption; A Status Report. Astrophysics and Space Science Proceedings, 125-137.
  • Vergani, S. D., Piranomonte, S., Hartoog, O. E., D'Elia, V., Cupani, G., de Ugarte Postigo, A., ... Kaper, L. (2011). GRB 111211A: VLT/X-shooter redshift. GRB Coordinates Network, Circular Service, 12667.

2010

  • Chemla, F., Dalton, G., Guinouard, I., Pragt, J., Sawyer, E., Spanò, P., ... Kaper, L. (2010). OPTIMOS-EVE design trade-off analysis. Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, 7735, 184. DOI: 10.1117/12.857519 
  • Groot, P., Kaper, L., Ellerbroek, L., Malesani, D., Jakobsson, P., Fynbo, J. P. U., ... Mason, E. (2010). GRB 100219A: VLT/X-shooter redshift. GRB Coordinates Network, Circular Service, 10441. [details] 
  • Iping, R., Kaper, L., & Sonneborn, G. (2010). Wavelength-Dependent Structure in the Vela X-1 Bow Shock. Bulletin - American Astronomical Society, 215, 365.
  • Milvang-Jensen, B., Goldoni, P., Tanvir, N. R., Wiersema, K., Malesani, D., de Ugarte Postigo, A., ... Kruehler, T. (2010). GRB 100621A: VLT/X-shooter redshift. GRB Coordinates Network, Circular Service, 10876. [details] 
  • Navarro, R., Chemla, F., Bonifacio, P., Flores, H., Guinouard, I., Huet, J-M., ... Hammer, F. (2010). Project overview of OPTIMOS-EVE: the fibre-fed multi-object spectrograph for the E-ELT. Proceedings of SPIE, the International Society for Optical Engineering, 7735, 77352L. DOI: 10.1117/12.857638  [details] 
  • Vernet, J., Dekker, H., D'Odorico, S., Mason, E., Di Marcantonio, P., Downing, M., ... Zerbi, F. (2010). Performances of X-shooter, the new wide-band intermediate resolution spectrograph at the VLT. Proceedings of SPIE, the International Society for Optical Engineering, 7735, 77351I. DOI: 10.1117/12.857124  [details] 

2009

  • de Ugarte Postigo, A., D'Odorico, S., Vernet, J., Modigliani, A., Ramsay, S., Covino, S., ... Groot, P. J. (2009). X-shooter observations of GRB 090313. GRB Coordinates Network, Circular Service, 9015. [details] 

Award

  • Kaper, L. (2016): NWO-FAPESP Advanced Instrumentation for Astronomy.

Scientific position

  • Kaper, L. (2016): Lid Bestuur, Stichting Het Leids Kerkhoven-Bosscha Fonds.
  • Kaper, L. (2016): Membership Committee member, International Astronomical Union.
  • Kaper, L. (2016): EAS Council (since 2016)
    Responsibility: overseeing the organisation of EWASS, European Astronomical Society.

Media appearance

  • Kaper, Lex (26-01-2016): Vier Nederlands – Braziliaanse projecten 'Advanced Instrumentation for Astronomy' van start [Web] Nederlandse Organisatie voor Wetenschappelijk Onderzoek. Toekenning grant NWO-FAPESP voor E-ELT MOSAIC.

Talk / presentation

  • Kaper, L. (speaker) (30-3-2016): Quantitative spectroscopy of OB-type stars, SWEDIBLES, Leiden, Netherlands.

Others

  • Hessels, J.W.T. (chair), Rowlinson, B.A. (organiser), Kaper, L. (organiser) & de Koter, A. (organiser) (2016): Nederlandse Astronomen Conferentie 2016 (organising a conference, workshop, ...).
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  • No ancillary activities

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