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ID 34779
本文ファイル
著者
Tanaka, Masaomi
Kawabata, Koji S.
Hattori, Takashi
Mazzali, Paolo A.
Aoki, Kentaro
Iye, Masanori
Maeda, Keiichi
Nomoto, Ken'ichi
Pian, Elena
Sasaki, Toshiyuki
キーワード
supernovae: general
supernovae: individual (SNe 2009jf, 2009mi)
techniques: polarimetric
NDC
天文学・宇宙科学
抄録(英)
We study the multi-dimensional geometry of supernova (SN) explosions by means of spectropolarimetric observations of stripped-envelope SNe, i.e., SNe without a hydrogen-rich layer. We perform spectropolarimetric observations of two stripped-envelope SNe, Type Ib SN 2009jf and Type Ic SN 2009mi. Both objects show non-zero polarization at the wavelength of the strong lines. They also show a loop in the Stokes Q-U diagram, which indicates a non-axisymmetric, three-dimensional ion distribution in the ejecta. We show that five out of six stripped-envelope SNe, which have been observed spectropolarimetrically so far, show such a loop. This implies that a three-dimensional geometry is common in stripped-envelope SNe. We find that stronger lines tend to show higher polarization. This effect is not related to the geometry, and must be corrected for to compare the polarization of different lines or different objects. Even after the correction, however, there remains a dispersion of polarization degree among different objects. Such a dispersion might be caused by three-dimensional clumpy ion distributions viewed from different directions.
掲載誌名
Astrophysical Journal
754巻
1号
開始ページ
63
出版年月日
2012
出版者
IOP Publishing Ltd
ISSN
0004-637X
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
(c) 2012. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
関連情報URL
部局名
宇宙科学センター