OPTICAL OBSERVATIONS OF THE TYPE IA SUPERNOVA SN 2011fe IN M101 FOR NEARLY 500 DAYS

	OPTICAL OBSERVATIONS OF THE TYPE IA SUPERNOVA SN 2011fe IN M101 FOR NEARLY 500 DAYS
	Zhang, Kaicheng 1,2; Wang, Xiaofeng 1,2; Zhang, Jujia 3,4; Zhang, Tianmeng5 ; Ganeshalingam, Mohan 6; Li, Weidong 6; Filippenko, Alexei V.6; Zhao, Xulin 1,2; Zheng, Weikang 6; Bai, Jinming 3,4
刊名	ASTROPHYSICAL JOURNAL
	2016-03-20
卷号	820 期号:1
关键词	supernovae: general supernovae: individual (SN 2011fe)
英文摘要	We present well-sampled optical observations of the bright Type Ia supernova (SN Ia) SN 2011fe in M101. Our data, starting from similar to 16 days before maximum light and extending to similar to 463 days after maximum, provide an unprecedented time series of spectra and photometry for a normal SN Ia. Fitting the early-time rising light curve, we find that the luminosity evolution of SN 2011fe follows a t(n) law, with the index n being close to 2.0 in the VRI bands but slightly larger in the U and B bands. Combining the published ultraviolet (UV) and near-infrared (NIR) photometry, we derive the contribution of UV/NIR emission relative to the optical. SN 2011fe is found to have stronger UV emission and reaches its UV peak a few days earlier than other SNe Ia with similar Delta m(15)(B), suggestive of less trapping of high-energy photons in the ejecta. Moreover, the U-band light curve shows a notably faster decline at late phases (t approximate to 100-300 days), which also suggests that the ejecta may be relatively transparent to UV photons. These results favor the notion that SN 2011fe might have a progenitor system with relatively lower metallicity. On the other hand, the early-phase spectra exhibit prominent high-velocity features (HVFs) of O I lambda 7773 and the Ca II NIR triplet, but only barely detectable in Si II 6355. This difference can be caused by either an ionization/temperature effect or an abundance enhancement scenario for the formation of HVFs; it suggests that the photospheric temperature of SN 2011fe is intrinsically low, perhaps owing to incomplete burning during the explosion of the white dwarf.
收录类别	SCI
语种	英语
WOS记录号	WOS:000372787000066
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5354]
专题	国家天文台_光学天文研究部
作者单位	1.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China 2.Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China 3.Chinese Acad Sci, Yunnan Astron Observ China, Kunming 650011, Peoples R China 4.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Peoples R China 5.Chinese Acad Sci, Natl Astron Observ China, Beijing 100012, Peoples R China 6.Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA 7.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 8.Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA
推荐引用方式 GB/T 7714	Zhang, Kaicheng,Wang, Xiaofeng,Zhang, Jujia,et al. OPTICAL OBSERVATIONS OF THE TYPE IA SUPERNOVA SN 2011fe IN M101 FOR NEARLY 500 DAYS[J]. ASTROPHYSICAL JOURNAL,2016,820(1).
APA	Zhang, Kaicheng.,Wang, Xiaofeng.,Zhang, Jujia.,Zhang, Tianmeng.,Ganeshalingam, Mohan.,...&Wu, Chao.(2016).OPTICAL OBSERVATIONS OF THE TYPE IA SUPERNOVA SN 2011fe IN M101 FOR NEARLY 500 DAYS.ASTROPHYSICAL JOURNAL,820(1).
MLA	Zhang, Kaicheng,et al."OPTICAL OBSERVATIONS OF THE TYPE IA SUPERNOVA SN 2011fe IN M101 FOR NEARLY 500 DAYS".ASTROPHYSICAL JOURNAL 820.1(2016).