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	The Astrophysical Journal
	2017-11-17
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	Abstract PS16dtm was classified as a candidate tidal disruption event in a dwarf Seyfert 1 galaxy with a low-mass black hole ( ) 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 ～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 ～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.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-850-1-AA93F5
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32091]
专题	中国科学院上海天文台
作者单位	1.Key laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026, China; jnac@ustc.edu.cn 2.School of Astronomy and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China; twang@ustc.edu.cn 3.Caltech Optical Observatories, Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USA; lyan@ipac.caltech.edu 4.IPAC, Mail Code 100-22, California Institute of Technology, 1200 E. California Boulevard, Pasadena, CA 91125, USA 5.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Astronomical Society, 80 Nandan Road, Shanghai 200030, China 6.Center for Astrophysics, Guangzhou University, Guangzhou 510006, China 7.Jet Propulsion Laboratory, California Institute of Technology, 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]. The 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.The Astrophysical Journal,850(1).
MLA	Jiang,Ning,et al."Mid-infrared Flare of TDE Candidate PS16dtm: Dust Echo and Implications for the Spectral Evolution".The Astrophysical Journal 850.1(2017).