Spectroscopic Discovery of the Broad-Lined Type Ic Supernova 2010bh Associated with the Low-Redshift GRB 100316D
Abstract
We present the spectroscopic discovery of a broad-lined Type Ic supernova (SN 2010bh) associated with the nearby long-duration gamma-ray burst (GRB) 100316D. At z = 0.0593, this is the third-nearest GRB-SN. Nightly optical spectra obtained with the Magellan telescopes during the first week after explosion reveal the gradual emergence of very broad spectral features superposed on a blue continuum. The supernova features are typical of broad-lined SNe Ic and are generally consistent with previous supernovae associated with low-redshift GRBs. However, the inferred velocities of SN 2010bh at 21 days after explosion are a factor of ~2 times larger than those of the prototypical SN 1998bw at similar epochs, with v ~ 26,000 km/s, indicating a larger explosion energy or a different ejecta structure. A near-infrared spectrum taken 13.8 days after explosion shows no strong evidence for He I at 1.083 microns, implying that the progenitor was largely stripped of its helium envelope. The host galaxy is of low luminosity (M_R ~ -18.5 mag) and low metallicity (Z < 0.4 Z_solar), similar to the hosts of other low-redshift GRB-SNe.
Keywords
Cite
@article{arxiv.1004.2262,
title = {Spectroscopic Discovery of the Broad-Lined Type Ic Supernova 2010bh Associated with the Low-Redshift GRB 100316D},
author = {Ryan Chornock and Edo Berger and Emily M. Levesque and Alicia M. Soderberg and Ryan J. Foley and Derek B. Fox and Anna Frebel and Joshua D. Simon and John J. Bochanski and Peter J. Challis and Robert P. Kirshner and Philipp Podsiadlowski and Katherine Roth and Robert E. Rutledge and Brian P. Schmidt and Scott S. Sheppard and Robert A. Simcoe},
journal= {arXiv preprint arXiv:1004.2262},
year = {2010}
}
Comments
6 pages, 4 figures, 1 table, submitted to ApJ Letters