Nebular Phase Observations of the Type Ib Supernova 2008D/X-Ray Transient 080109 : Side-Viewed Bipolar Explosion
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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 Ni-56 mass of 0.07 M-circle dot, 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 degrees from the polar direction.
収録刊行物
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- Astrophysical Journal
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Astrophysical Journal 700 (2), 1680-1685, 2009
IOP Publishing LTD
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詳細情報 詳細情報について
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- CRID
- 1050577740962961664
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- NII論文ID
- 120001898386
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- NII書誌ID
- AA00553253
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- 本文言語コード
- en
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- 資料種別
- journal article
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- IRDB
- CiNii Articles