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The Highly Energetic Expansion of SN2010bh Associated with GRB 100316D
Bufano F., Pian E., Sollerman J., Benetti S., Pignata G. et al
Astrophysical Journal 753 (2012) 67 - http://hal.archives-ouvertes.fr/hal-00712581
Physique/Astrophysique/Phénomènes cosmiques de haute energie
Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie
The Highly Energetic Expansion of SN2010bh Associated with GRB 100316D
Filomena Bufano, Elena Pian, Jesper Sollerman, Stefano Benetti, Giuliano Pignata, Stefano Valenti, Stefano Covino, Paolo D'Avanzo, Daniele Malesani, Enrico Cappellaro, Massimo Della Valle, Johan Fynbo, Jens Hjorth, Paolo A. Mazzali, Daniel E. Reichart, Rhaana L. C. Starling, Massimo Turatto, Susanna D. Vergani, Klass Wiersema, Lorenzo Amati, David Bersier, Sergio Campana, Zach Cano, Alberto J. Castro-Tirado, Guido Chincarini, Valerio D'Elia, Antonio de Ugarte Postigo, Jinsong Deng, Patrizia Ferrero, Alexei V. Filippenko, P. Goldoni1, 2, Javier Gorosabel, Jochen Greiner, F. Hammer3, Pall Jakobsson, Lex Kaper, Koji S. Kawabata, Sylvio Klose, Andrew J. Levan, Keiichi Maeda, Nicola Masetti, Bo Milvang-Jensen, Felix I. Mirabel2, Palle Moller, Kenichi Nomoto, Eliana Palazzi, Silvia Piranomonte, Ruben Salvaterra, Giulia Stratta, Gianpiero Tagliaferri, Masaomi Tanaka, Nial R. Tanvir, Ralph A. M. J. Wijers
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13
2 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
3 :  GEPI - Galaxies, Etoiles, Physique, Instrumentation
CNRS : UMR8111 – INSU – Observatoire de Paris – Université Paris VII - Paris Diderot
5, place Jules Janssen 92195 MEUDON CEDEX
We present the spectroscopic and photometric evolution of the nearby (z = 0.059) spectroscopically confirmed type Ic supernova, SN 2010bh, associated with the soft, long-duration gamma-ray burst (X-ray flash) GRB 100316D. Intensive follow-up observations of SN 2010bh were performed at the ESO Very Large Telescope (VLT) using the X-shooter and FORS2 instruments. Owing to the detailed temporal coverage and the extended wavelength range (3000--24800 A), we obtained an unprecedentedly rich spectral sequence among the hypernovae, making SN 2010bh one of the best studied representatives of this SN class. We find that SN 2010bh has a more rapid rise to maximum brightness (8.0 +/- 1.0 rest-frame days) and a fainter absolute peak luminosity (L_bol~3e42 erg/s) than previously observed SN events associated with GRBs. Our estimate of the ejected (56)Ni mass is 0.12 +/- 0.02 Msun. From the broad spectral features we measure expansion velocities up to 47,000 km/s, higher than those of SNe 1998bw (GRB 980425) and 2006aj (GRB 060218). Helium absorption lines He I lambda5876 and He I 1.083 microm, blueshifted by ~20,000--30,000 km/s and ~28,000--38,000 km/s, respectively, may be present in the optical spectra. However, the lack of coverage of the He I 2.058 microm line prevents us from confirming such identifications. The nebular spectrum, taken at ~186 days after the explosion, shows a broad but faint [O I] emission at 6340 A. The light-curve shape and photospheric expansion velocities of SN 2010bh suggest that we witnessed a highly energetic explosion with a small ejected mass (E_k ~ 1e52 erg and M_ej ~ 3 Msun). The observed properties of SN 2010bh further extend the heterogeneity of the class of GRB supernovae.

Astrophysical Journal (Astrophys. J.)
Publisher American Astronomical Society
ISSN 0004-637X 
Articles dans des revues avec comité de lecture

supernovae – general – supernovae – individual – SN 2010bh – GRB 100316D
37 pages and 12 figures (one-column pre-print format)

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