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Nebular phase observations of the type Ib supernova 2008D/X-ray transient 080109: side-viewed bipolar explosion

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dc.contributor.author Tanaka, M
dc.contributor.author Yamanaka, M
dc.contributor.author Maeda, K
dc.contributor.author Kawabata, K. S
dc.contributor.author Hattori, T
dc.contributor.author Minezaki, T
dc.contributor.author Valenti, S
dc.contributor.author Valle, M. D
dc.contributor.author Sahu, D. K
dc.contributor.author Anupama, G. C
dc.contributor.author Tominaga, N
dc.contributor.author Nomoto, K
dc.contributor.author Mazzali, P. A
dc.contributor.author Pian, E
dc.date.accessioned 2009-08-05T11:06:27Z
dc.date.available 2009-08-05T11:06:27Z
dc.date.issued 2009-08
dc.identifier.citation The Astrophysical Journal, Vol. 700, No. 2, pp. 1680 - 1685 en
dc.identifier.issn 0004-637X
dc.identifier.uri http://hdl.handle.net/2248/4719
dc.description.abstract Abstract We present optical spectroscopic and photometric observations of supernova (SN) 2008D, associated with the luminous X-ray transient 080109, at >300 days after the explosion (nebular phases). We also give flux measurements of emission lines from the H II region at the site of the SN, and estimates of the local metallicity. The brightness of the SN at nebular phases is consistent with the prediction of the explosion models with an ejected 56Ni mass of 0.07 M sun, which explains the light curve at early phases. The [O I] line in the nebular spectrum shows a double-peaked profile while the [Ca II] line does not. The double-peaked [O I] profile strongly indicates that SN 2008D is an aspherical explosion. The profile can be explained by a torus-like distribution of oxygen viewed from near the plane of the torus. We suggest that SN 2008D is a side-viewed, bipolar explosion with a viewing angle of >50° from the polar direction. en
dc.language.iso en en
dc.publisher The American Astronomical Society en
dc.relation.uri http://www.iop.org/EJ/abstract/0004-637X/700/2/1680/ en
dc.relation.uri http://arxiv.org/abs/0906.1061 en
dc.rights © Institute of Physics en
dc.subject Line: Profiles en
dc.subject Nuclear Reactions en
dc.subject Nucleosynthesis en
dc.subject Abundances en
dc.subject Supernovae: General en
dc.subject Supernovae: Individual: SN 2008D en
dc.title Nebular phase observations of the type Ib supernova 2008D/X-ray transient 080109: side-viewed bipolar explosion en
dc.type Article en

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