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Distribution of Si II lambda 6355 velocities of Type Ia supernovae and implications for asymmetric explosions
Zhang, Keto D.1; Zheng, WeiKang1; de Jaeger, Thomas1; Stahl, Benjamin E.1,2; Brink, Thomas G.1; Han, Xuhui3; Kasen, Daniel1,2,4; Shen, Ken J.1; Tang, Kevin1; Filippenko, Alexei, V1,5
2020-12-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume499Issue:4Pages:5325-5333
AbstractThe ejecta velocity is a very important parameter in studying the structure and properties of Type Ia supernovae (SNe Ia) and is a candidate key parameter in improving the utility of SNe Ia for cosmological distance determinations. Here, we study the velocity distribution of a sample of 311 SNe Ia from the kaepora data base. The velocities are derived from the Si II lambda 6355 absorption line in optical spectra measured at (or extrapolated to) the time of peak brightness. We statistically show that the observed velocity has a bimodal Gaussian distribution (population ratio 201:110 or 65 per cent:35 per cent) consisting of two groups of SNe Ia: Group I with a lower but narrower scatter ( 11 000 +/- 700 km s(-1)), and Group II with a higher but broader scatter (12 300 +/- 1800 km s(-1)). The true origin of the two components is unknown. Naturally, there could exist two intrinsic velocity distributions observed. However, we try to use asymmetric geometric models through statistical simulations to reproduce the observed distribution assuming that all SNe Ia share the same intrinsic distribution. In the two cases we consider, 35 per cent of SNe Ia are considered to be asymmetric in Case 1, and all SNe Ia are asymmetric in Case 2. Simulations for both cases can reproduce the observed velocity distribution but require a significantly large portion (> 35 per cent) of SNe Ia to be asymmetric. In addition, the Case 1 result is consistent with recent SNe Ia polarization observations that higher Si II.6355 velocities tend to be more polarized.
Keywordmethods: statistical supernovae: general
Funding OrganizationAnslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Anslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Christopher R. Redlich Fund ; Christopher R. Redlich Fund ; TABASGO Foundation ; TABASGO Foundation ; Miller Institute for Basic Research in Science (U.C. Berkeley) ; Miller Institute for Basic Research in Science (U.C. Berkeley) ; Anslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Anslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Christopher R. Redlich Fund ; Christopher R. Redlich Fund ; TABASGO Foundation ; TABASGO Foundation ; Miller Institute for Basic Research in Science (U.C. Berkeley) ; Miller Institute for Basic Research in Science (U.C. Berkeley) ; Anslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Anslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Christopher R. Redlich Fund ; Christopher R. Redlich Fund ; TABASGO Foundation ; TABASGO Foundation ; Miller Institute for Basic Research in Science (U.C. Berkeley) ; Miller Institute for Basic Research in Science (U.C. Berkeley) ; Anslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Anslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Christopher R. Redlich Fund ; Christopher R. Redlich Fund ; TABASGO Foundation ; TABASGO Foundation ; Miller Institute for Basic Research in Science (U.C. Berkeley) ; Miller Institute for Basic Research in Science (U.C. Berkeley)
DOI10.1093/mnras/staa3191
WOS KeywordFAILED DEFLAGRATION MODEL ; THERMONUCLEAR SUPERNOVAE ; WHITE-DWARFS ; SPECTRA ; PROGRAM ; SPECTROPOLARIMETRY ; BINARIES ; UNIVERSE
Language英语
Funding ProjectAnslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Christopher R. Redlich Fund ; TABASGO Foundation ; Miller Institute for Basic Research in Science (U.C. Berkeley)
Funding OrganizationAnslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Anslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Christopher R. Redlich Fund ; Christopher R. Redlich Fund ; TABASGO Foundation ; TABASGO Foundation ; Miller Institute for Basic Research in Science (U.C. Berkeley) ; Miller Institute for Basic Research in Science (U.C. Berkeley) ; Anslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Anslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Christopher R. Redlich Fund ; Christopher R. Redlich Fund ; TABASGO Foundation ; TABASGO Foundation ; Miller Institute for Basic Research in Science (U.C. Berkeley) ; Miller Institute for Basic Research in Science (U.C. Berkeley) ; Anslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Anslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Christopher R. Redlich Fund ; Christopher R. Redlich Fund ; TABASGO Foundation ; TABASGO Foundation ; Miller Institute for Basic Research in Science (U.C. Berkeley) ; Miller Institute for Basic Research in Science (U.C. Berkeley) ; Anslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Anslem M&PS Fund through the Berkeley Summer Undergraduate Research Fellowship (SURF) program in 2019 ; Christopher R. Redlich Fund ; Christopher R. Redlich Fund ; TABASGO Foundation ; TABASGO Foundation ; Miller Institute for Basic Research in Science (U.C. Berkeley) ; Miller Institute for Basic Research in Science (U.C. Berkeley)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000599131700050
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/80335
Collection中国科学院国家天文台
Corresponding AuthorZhang, Keto D.; Zheng, WeiKang
Affiliation1.Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA
2.Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
3.Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100101, Peoples R China
4.Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
5.Univ Calif Berkeley, Miller Inst Basic Res Sci, Berkeley, CA 94720 USA
Recommended Citation
GB/T 7714
Zhang, Keto D.,Zheng, WeiKang,de Jaeger, Thomas,et al. Distribution of Si II lambda 6355 velocities of Type Ia supernovae and implications for asymmetric explosions[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,499(4):5325-5333.
APA Zhang, Keto D..,Zheng, WeiKang.,de Jaeger, Thomas.,Stahl, Benjamin E..,Brink, Thomas G..,...&Filippenko, Alexei, V.(2020).Distribution of Si II lambda 6355 velocities of Type Ia supernovae and implications for asymmetric explosions.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,499(4),5325-5333.
MLA Zhang, Keto D.,et al."Distribution of Si II lambda 6355 velocities of Type Ia supernovae and implications for asymmetric explosions".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 499.4(2020):5325-5333.
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