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Supernova Shock Breakout from a Red Supergiant
K. Schawinski, S. Justham, Ph. Podsiadlowski, M. Sullivan, K. C. Steenbrugge, T. Bell, H.-J. Roser, E. Walker, P. Astier1, D. Balam, Ch. Balland1, S. Basa2, R. Carlberg, A. Conley, D. Fouchez3, J. Guy1, D. Hardin1, I. Hook, A. Howell, R. Pain1, K. Perrett, Ch. Pritchet, N. Regnault1, S. K. Yi
SUPERNOVAE Collaboration(s)
(2008)

Massive stars undergo a violent death when the supply of nuclear fuel in their cores is exhausted, resulting in a catastrophic `core-collapse' supernova. Such events are usually detected long after the star has exploded. Here we report the first detection of the radiative precursor from a supernova shock before it has reached the surface of a star followed by the initial expansion of the star at the beginning of the explosion. Theoretical models of the ultraviolet light curve show that the progenitor was a red supergiant, as expected for this type of supernova. These observations provide a promising and novel way to probe the physics of core-collapse supernovae and the internal structures of their progenitors.
1 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
2 :  LAM - Laboratoire d'Astrophysique de Marseille
3 :  CPPM - Centre de Physique des Particules de Marseille
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/0803.3596