THE WISE DETECTION OF AN INFRARED ECHO IN TIDAL DISRUPTION EVENT ASASSN-14li
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Jiang, N., Dou, L., Wang, T., Yang, C., Lyu, J., & Zhou, H. (2016). The WISE detection of an infrared echo in tidal disruption event ASASSN-14li. The Astrophysical Journal Letters, 828(1), L14.Journal
ASTROPHYSICAL JOURNAL LETTERSRights
© 2016. The American Astronomical Society. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
We report the detection of a significant infrared variability of the nearest tidal disruption event (TDE) ASASSN-14li using Wide-field Infrared Survey Explorer and newly released Near-Earth Object WISE Reactivation data. In comparison with the quiescent state, the infrared flux is brightened by 0.12 and 0.16 mag in the W1 (3.4 mu m) and W2 (4.6 mu m) bands at 36 days after the optical discovery (or similar to 110 days after the peak disruption date). The flux excess is still detectable similar to 170 days later. Assuming that the flare-like infrared emission is from the dust around the black hole, its blackbody temperature is estimated to be similar to 2.1 x 10(3) K, slightly higher than the dust sublimation temperature, indicating that the dust is likely located close to the dust sublimation radius. The equilibrium between the heating and radiation of the dust claims a bolometric luminosity of similar to 10(43) - 10(45) erg s(-1), comparable with the observed peak luminosity. This result has for the first time confirmed the detection of infrared emission from the dust echoes of TDEs.ISSN
2041-8205Version
Final published versionSponsors
National Basic Research Program of China [2015CB857005]; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences [XDB09000000]; NSFC [NSFC-11233002, NSFC-11421303, U1431229]; Fundamental Research Funds for the Central Universities; CAS "Light of West China" Program [2015-XBQN-B-5]; National Aeronautics and Space Administration; Planetary Science Division of the National Aeronautics and Space Administrationae974a485f413a2113503eed53cd6c53
10.3847/2041-8205/828/1/L14