Mid-infrared Flare of TDE Candidate PS16dtm: Dust Echo and Implications for the Spectral Evolution

doi:10.3847/1538-4357/aa93f5

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	Mid-infrared Flare of TDE Candidate PS16dtm: Dust Echo and Implications for the Spectral Evolution
	Jiang, Ning 1,2; Wang, Tinggui 1,2; Yan, Lin 3,4; Xiao, Ting 5; Yang, Chenwei 1,2; Dou, Liming 6; Wang, Huiyuan 1,2; Cutri, Roc 4; Mainzer, Amy 7
刊名	ASTROPHYSICAL JOURNAL
	2017-11-20
卷号	850 期号:1
关键词	Galaxies: Active Galaxies: Individual (Ps16dtm) Galaxies: Nuclei
ISSN号	0004-637X
DOI	10.3847/1538-4357/aa93f5
英文摘要	PS16dtm was classified as a candidate tidal disruption event in a dwarf Seyfert 1 galaxy with a low-mass black hole (similar to 10(6) M-circle dot) and has presented various intriguing photometric and spectra characteristics. Using the archival Wide-field Infrared Survey Explorer and the newly released NEOWISE data, we found that PS16dtm is experiencing a mid-infrared (MIR) flare that started similar to 11 days before the first optical detection. Interpreting the MIR flare as a dust echo requires close pre-existing dust with a high covering factor and suggests that the optical flare may have brightened slowly for some time before it became bright detectable from the ground. More evidence is given at the later epochs. At the peak of the optical light curve, the new inner radius of the dust torus has grown to a much larger size (i.e., a factor of seven of the initial radius) due to the strong radiation field. At similar to 150 days after the first optical detection, the dust temperature has dropped well below the sublimation temperature. Other peculiar spectral features shown by PS16dtm are the transient, prominent Fe II emission lines and outflows indicated by broad absorption lines detected during the optical flare. Our model explains the enhanced Fe II. emission from iron that is newly released from the evaporated dust. The observed broad absorption line outflow could be explained by accelerated gas in the dust torus due to the radiation pressure.
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000415832400006
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32445]
专题	中国科学院上海天文台
通讯作者	Jiang, Ning
作者单位	1.Univ Sci & Technol China, Chinese Acad Sci, Dept Astron, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China 2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China 3.CALTECH, Cahill Ctr Astron & Astrophys, Caltech Opt Observ, Pasadena, CA 91125 USA 4.CALTECH, IPAC, Mail Code 100-22,1200 E Calif Blvd, Pasadena, CA 91125 USA 5.Chinese Astron Soc, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China 6.Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Guangdong, Peoples R China 7.CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
推荐引用方式 GB/T 7714	Jiang, Ning,Wang, Tinggui,Yan, Lin,et al. Mid-infrared Flare of TDE Candidate PS16dtm: Dust Echo and Implications for the Spectral Evolution[J]. ASTROPHYSICAL JOURNAL,2017,850(1).
APA	Jiang, Ning.,Wang, Tinggui.,Yan, Lin.,Xiao, Ting.,Yang, Chenwei.,...&Mainzer, Amy.(2017).Mid-infrared Flare of TDE Candidate PS16dtm: Dust Echo and Implications for the Spectral Evolution.ASTROPHYSICAL JOURNAL,850(1).
MLA	Jiang, Ning,et al."Mid-infrared Flare of TDE Candidate PS16dtm: Dust Echo and Implications for the Spectral Evolution".ASTROPHYSICAL JOURNAL 850.1(2017).