Premaximum spectropolarimetry of the type ia SN 2004dt

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 毫米波和亚毫米波技术实验室

	Premaximum spectropolarimetry of the type ia SN 2004dt
	Wang, Lifan; Baade, Dietrich ; Hoflich, Peter ; Wheeler, J. Craig ; Kawabata, Koji ; Khokhlov, Alexei ; Nomoto, Ken'ichi ; Patat, Ferdinando
刊名	ASTROPHYSICAL JOURNAL
	2006-12-10
卷号	653 期号:1 页码:490-502
关键词	supernovae : individual (SN 2004dt) techniques : polarimetric
ISSN号	0004-637X
英文摘要	We report observations of SN 2004dt obtained with the Very Large Telescope (VLT) of the European Southern Observatory (ESO) on 2004 August 13.30, when the supernova was more than a week before optical maximum. SN 2004dt showed strong lines of O I, Mg II, Si II, and Ca II, with typical velocities of absorption minimum around 17,000 km s(-1). The line profiles show material moving at velocities as high as 25,000 km s-1 in these lines. The observations also reveal absorption lines from S II and Si III with a velocity of only 11,000 km s(-1). The highest velocity in the S II features can be traced to about 15,000 km s(-1), much lower than those of 0, Mg, Si, and Ca. SN 2004dt has a polarization spectrum unlike any previously observed. The variation of the polarization across some Si II lines approaches 2%, making SN 2004dt the most highly polarized SN Ia ever observed. In contrast, the strong line of 0 1 at 777.4 nm shows little or no polarization signature. The degree of polarization points to a silicon layer with substantial departure from spherical symmetry. A geometry that would account for the observations is one in which the distribution of oxygen is essentially spherically symmetric, but with protrusions of intermediate-mass elements within the oxygen-rich region.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	WHITE-DWARF MODELS ; INFRARED-SPECTRA ; DELAYED DETONATION ; SUPER-NOVAE ; EJECTA ; POLARIZATION ; ASPHERICITY ; SIMULATIONS ; EXPLOSION ; 1999BY
收录类别	SCI
语种	英语
WOS记录号	WOS:000242913800039
公开日期	2012-02-07
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/3536]
专题	紫金山天文台_毫米波和亚毫米波技术实验室
作者单位	1.Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA 2.Lawrence Berkeley Lab, Berkeley, CA 94712 USA 3.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China 4.European So Observ, D-85748 Garching, Germany 5.Univ Texas, Dept Astron, Austin, TX 78712 USA 6.Univ Texas, McDonald Observ, Austin, TX 78712 USA 7.Hiroshima Univ, Ctr Astrophys Sci, Higashihiroshima, Hiroshima 7398526, Japan 8.Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA 9.Univ Tokyo, Dept Astron, Bunkyo Ku, Tokyo 1130033, Japan
推荐引用方式 GB/T 7714	Wang, Lifan,Baade, Dietrich,Hoflich, Peter,et al. Premaximum spectropolarimetry of the type ia SN 2004dt[J]. ASTROPHYSICAL JOURNAL,2006,653(1):490-502.
APA	Wang, Lifan.,Baade, Dietrich.,Hoflich, Peter.,Wheeler, J. Craig.,Kawabata, Koji.,...&Patat, Ferdinando.(2006).Premaximum spectropolarimetry of the type ia SN 2004dt.ASTROPHYSICAL JOURNAL,653(1),490-502.
MLA	Wang, Lifan,et al."Premaximum spectropolarimetry of the type ia SN 2004dt".ASTROPHYSICAL JOURNAL 653.1(2006):490-502.