Photometric and Spectroscopic Properties of Type Ia Supernova 2018oh with Early Excess Emission from the Kepler 2 Observations

doi:10.3847/1538-4357/aaec74

	Photometric and Spectroscopic Properties of Type Ia Supernova 2018oh with Early Excess Emission from the Kepler 2 Observations
	Li, W.1,2,3; Wang, X.1,2 ; Vinko, J.4,5,6; Mo, J.1,2; Hosseinzadeh, G.3,7,8; Sand, D. J.9; Zhang, J.1,2,10,11,12 ; Lin, H.1,2; Zhang, T.13; Wang, L.13,14,15,19
刊名	ASTROPHYSICAL JOURNAL
	2019
卷号	870 期号:1 页码:33
关键词	supernovae: general supernovae: individual (SN 2018oh)
ISSN号	0004-637X
DOI	10.3847/1538-4357/aaec74
通讯作者	Li, W.()
英文摘要	Supernova (SN) 2018oh (ASASSN-18bt) is the first spectroscopically confirmed Type Ia supernova (SN Ia) observed in the Kepler field. The Kepler data revealed an excess emission in its early light curve, allowing us to place interesting constraints on its progenitor system. Here we present extensive optical, ultraviolet, and nearinfrared photometry, as well as dense sampling of optical spectra, for this object. SN 2018oh is relatively normal in its photometric evolution, with a rise time of 18.3 +/- 0.3 days and Delta m(15)(B) = 0.96 +/- 0.03 mag, but it seems to have bluer B - V colors. We construct the "UVOIR" bolometric light curve having a peak luminosity of 1.49. x. 10(43) erg s(-1), from which we derive a nickel mass as 0.55 +/- 0.04M(circle dot) by fitting radiation diffusion models powered by centrally located Ni-56. Note that the moment when nickel-powered luminosity starts to emerge is + 3.85 days after the first light in the Kepler data, suggesting other origins of the early-time emission, e. g., mixing of Ni-56 to outer layers of the ejecta or interaction between the ejecta and nearby circumstellar material or a nondegenerate companion star. The spectral evolution of SN 2018oh is similar to that of a normal SN Ia but is characterized by prominent and persistent carbon absorption features. The C. II features can be detected from the early phases to about 3 weeks after the maximum light, representing the latest detection of carbon ever recorded in an SN Ia. This indicates that a considerable amount of unburned carbon exists in the ejecta of SN 2018oh and may mix into deeper layers.
WOS关键词	HIGH-VELOCITY FEATURES ; WHITE-DWARF MODELS ; LIGHT CURVES ; CIRCUMSTELLAR MATERIAL ; FACTORY OBSERVATIONS ; IMPROVED DISTANCES ; DATA RELEASE ; SN 2011FE ; SPECTRA ; ULTRAVIOLET
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000454551600001
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/20481]
专题	中国科学院紫金山天文台
通讯作者	Li, W.
作者单位	1.Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China 2.Tsinghua Univ, Tsinghua Ctr Astrophys THCA, Beijing 100084, Peoples R China 3.Las Cumbres Observ, 6740 Cortona Dr Ste 102, Goleta, CA 93117 USA 4.Konkoly Observ Budapest, MTA CSFK, Konkoly Thege M Ut 15-17, H-1121 Budapest, Hungary 5.Univ Szeged, Dept Opt & Quantum Elect, Dom Ter 9, H-6720 Szeged, Hungary 6.Univ Texas Austin, Dept Astron, RLM 15308, Austin, TX 78712 USA 7.Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA 8.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA 9.Univ Arizona, Steward Observ, 933 North Cherry Ave,Rm N204, Tucson, AZ 85721 USA 10.Chinese Acad Sci, Yunnan Observ YNAO, Kunming 650216, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Li, W.,Wang, X.,Vinko, J.,et al. Photometric and Spectroscopic Properties of Type Ia Supernova 2018oh with Early Excess Emission from the Kepler 2 Observations[J]. ASTROPHYSICAL JOURNAL,2019,870(1):33.
APA	Li, W..,Wang, X..,Vinko, J..,Mo, J..,Hosseinzadeh, G..,...&Elsaesser, B..(2019).Photometric and Spectroscopic Properties of Type Ia Supernova 2018oh with Early Excess Emission from the Kepler 2 Observations.ASTROPHYSICAL JOURNAL,870(1),33.
MLA	Li, W.,et al."Photometric and Spectroscopic Properties of Type Ia Supernova 2018oh with Early Excess Emission from the Kepler 2 Observations".ASTROPHYSICAL JOURNAL 870.1(2019):33.