Explosion Of A Massive, He-rich Star At Z=0.16.

Details Explosion Of A Massive, He-rich Star At Z=0.16. Explosion Of A Massive, He-rich Star At Z=0.16.

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21431601e&link_type=abstract

American Astronomical Society, AAS Meeting #214, #316.01; Bulletin of the American Astronomical Society, Vol. 41, p.761

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We present spectroscopic and photometric data of the peculiar type Ib supernova 2001gh, discovered by the "Southern inTermediate Redshift ESO Supernova Search" at a redshift z=0.16. SN 2001gh has high luminosity at maximum, while the light curve shows a broad, delayed peak. An early-time spectrum shows an almost featureless blue continuum with a few weak P-Cygni lines that we attribute to He I. These lines remain the only spectral features visible in another spectrum obtained one month later. Three possible scenarios are considered: a massive and energetic progenitor with M(ejecta) 30 Mo, E 6xE52 erg and earlier explosion date; a moderate-mass progenitor with M(ejecta) 15 Mo, M(Ni) = 0.65 Mo and E 18xE51 erg; or a more canonical SN Ib with a dense, circumstellar shell.

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