The Fast and Faint SN 2010bh Associated with GRB 100316D

Details The Fast and Faint SN 2010bh Associated with GRB 100316D The Fast and Faint SN 2010bh Associated with GRB 100316D

2011-11-19

arxiv.org/abs/1111.4527v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

36 pages and 13 figures (one-column pre-print format), submitted to ApJ

Scientific paper

We present the spectroscopic and photometric evolution of the nearby (redshift 0.059) spectroscopically confirmed Type Ic supernova, SN 2010bh, associated with a 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 (300-2500 nm), 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 days) and a fainter absolute peak luminosity (L(bol)~3e42 ergs) 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 large expansion velocities, higher than those of SNe 1998bw (GRB 980425) and 2006aj (GRB 060218). The light-curve shape and photospheric expansion velocities of SN 2010bh suggest that we witnessed a relatively high-energy 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.

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