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=2009aipc.1111..448e&link_type=abstract

PROBING STELLAR POPULATIONS OUT TO THE DISTANT UNIVERSE: CEFALU 2008, Proceedings of the International Conference. AIP Conferen

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Supernova Remnants, X-Ray, Mossbauer, And Other Gamma-Ray Spectroscopic Analysis Methods, Cosmology

Scientific paper

We present spectroscopic and photometric data of the peculiar type Ib supernova 2001 gh, discovered by the Southern inTermediate Redshift ESO Supernova Search at a redshift z = 0.16. SN 2001 gh 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. He I 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 Mejecta~30Msolar, E~6x1052 erg and earlier explosion date; a moderate-mass progenitor with Mejecta~15Msolar, MNi = 0.65Msolar and E~18x1051 erg or a more canonical SN Ib with a dense, circumstellar shell.

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