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Optical Observations of the Rapidly Expanding Type Ia Supernova 2007gi
Zhang, T.1,2,3,4,5; Wang, X.2,3,6,7; Li, W.6; Filippenko, A. V.6; Wang, L.7; Zhou, X.1; Brown, P. J.8; Silverman, J. M.6; Steele, T. N.6; Ganeshalingam, M.6; Li, J.2,3; Deng, J.1; Li, T.2,3; Qiu, Y.1; Zhai, M.1,5; Shang, R.2,3
2010
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
Volume122Issue:887Pages:1-11
AbstractWe present optical photometry and spectra for the Type Ia supernova (SN Ia) 2007gi in the nearby galaxy NGC 4036. SN 2007gi is characterized by extremely high-velocity (HV) features of the intermediate-mass elements (Si, Ca, and S), with expansion velocities (v(exp)) approaching similar to 15; 500 km s(-1) near-maximum brightness (compared to similar to 10; 600 km s(-1) for SNe Ia with normal v(exp)). SN 2007gi reached a B-band peak magnitude of 13: 25 +/- 0: 04 mag with a decline rate of Delta m(15)(B)(true) = 1: 33 +/- 0: 09 mag. The B-band light curve of SN 2007gi demonstrated an interesting two-stage evolution during the nebular phase, with a decay rate of 1: 16 +/- 0: 05 mag (100 days)(-1) during t 60-90 days and 1: 61 +/- 0: 04 mag (100 days)(-1) thereafter. Such behavior was also observed in the HV SN Ia 2006X, and might be caused by the interaction between supernova ejecta and circumstellar material (CSM) around HV SNe Ia. Based on a sample of a dozen well-observed R band (or unfiltered) light curves of SNe Ia, we confirm that the HV events may have a faster rise time to maximum than those with normal v(exp).
Indexed BySCI
Language英语
WOS IDWOS:000273072600001
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7731
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ China, Beijing 100012, Peoples R China
2.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
3.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China
4.CNRS, LAM, F-13376 Marseille 12, France
5.Chinese Acad Sci, Grad Univ, Beijing 100012, Peoples R China
6.Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
7.Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA
8.Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA
Recommended Citation
GB/T 7714
Zhang, T.,Wang, X.,Li, W.,et al. Optical Observations of the Rapidly Expanding Type Ia Supernova 2007gi[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,2010,122(887):1-11.
APA Zhang, T..,Wang, X..,Li, W..,Filippenko, A. V..,Wang, L..,...&Shang, R..(2010).Optical Observations of the Rapidly Expanding Type Ia Supernova 2007gi.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,122(887),1-11.
MLA Zhang, T.,et al."Optical Observations of the Rapidly Expanding Type Ia Supernova 2007gi".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC 122.887(2010):1-11.
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