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ID 28876
file
creator
Tanaka, Masaomi
Maeda, Keiichi
Kawabata, Koji S
Hattori, Takashi
Minezaki, Takeo
Valenti, Stefano
Della Valle, Massimo
Sahu, D. K
Anupama, G. C
Tominaga, Nozomu
Nomoto, Ken'ichi
Mazzali, Paolo A
Pian, Elena
subject
line: profiles
nuclear reactions, nucleosynthesis, abundances
supernovae: general
supernovae: individual (SN 2008D)
NDC
Astronomy. Space sciences
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 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.
journal title
Astrophysical Journal
volume
Volume 700
issue
Issue 2
start page
1680
end page
1685
date of issued
2009
publisher
IOP Publishing LTD
issn
0004-637X
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
relation url
department
Graduate School of Science