Spectropolarimetry of Extremely Luminous Type Ia Supernova 2009dc: Nearly Spherical Explosion of Super-Chandrasekhar Mass White Dwarf

We present the first spectropolarimetric observations of a candidate of super-Chandrasekhar mass Type Ia supernova (SN): SN 2009dc. The observations were performed at 5.6 and 89.5 days after the B-band maximum. The data taken at the later epoch are used to determine the interstellar polarization. Co...

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Bibliographic Details
Published in:arXiv.org 2010-03
Main Authors: Tanaka, Masaomi, Kawabata, Koji S, Yamanaka, Masayuki, Maeda, Keiichi, Hattori, Takashi, Aoki, Kentaro, Nomoto, Ken'ichi, Iye, Masanori, Sasaki, Toshiyuki, Mazzali, Paolo A, Pian, Elena
Format: Article
Language:English
Subjects:
Explosions
Interstellar
Photometry
Polarization
Silicon
White dwarf stars
Online Access:Get full text
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Summary:We present the first spectropolarimetric observations of a candidate of super-Chandrasekhar mass Type Ia supernova (SN): SN 2009dc. The observations were performed at 5.6 and 89.5 days after the B-band maximum. The data taken at the later epoch are used to determine the interstellar polarization. Continuum polarization is found to be small (~ 1.2 Msun). The observed spectropolarimetric properties, combined with the photometric and spectroscopic properties, suggest that the progenitor of SN 2009dc has a super-Chandrasekhar mass, and that the explosion geometry is globally spherically symmetric, with clumpy distribution of intermediate-mass elements.
ISSN:2331-8422
DOI:10.48550/arxiv.0908.2057