期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 500, 期 2, 页码 1673-1696出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa3170
关键词
accretion, accretion discs; black hole physics; galaxies: nuclei
资金
- DDT award [2019B-003]
- Gordon and Betty Moore Foundation [GBMF5490]
- NSF [AST-1515927, AST-1908570, AST-0908816, AST-1907570/AST-1908952, AST-1920392, AST-1911074, AST-181440, AST-1815034, DGE1339067, AST-1518052, AST-1238877]
- Mt. Cuba Astronomical Foundation
- Center for Cosmology and AstroParticle Physics at the Ohio State University
- Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA)
- Villum Foundation
- George Skestos
- NASA [16-ADAP16-0232, 80NSSC20K0531, NNX08AR22G, NN12AR55G, 80NSSC18K0284, NNG05GF22G]
- DOE CSGF [DE-SC0019323]
- FONDECYT [1191038]
- Ministry of Economy, Development, and Tourism's Millennium Science Initiative [IC120009]
- NAOC
- CAS
- Special Fund for Astronomy from the Ministry of Finance
- Gordon & Betty Moore Foundation
- Heising-Simons Foundation
- David and Lucile Packard Foundation
- Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) [CE170100013]
- U.S. National Science Foundation [AST-0909182]
- W. M. Keck Foundation
This study presents observations of ASASSN-19dj, a tidal disruption event (TDE) discovered in the post-starburst galaxy KUG 0810+227 by ASAS-SN. Through high-cadence, multiwavelength spectroscopy and photometry, it was found that ASASSN-19dj peaked in the UV/optical on 6th March 2019, with a significant increase in X-ray flux after the peak.
We present observations of ASASSN-19dj, a nearby tidal disruption event (TDE) discovered in the post-starburst galaxy KUG 0810+227 by the All-Sky Automated Survey for Supernovae (ASAS-SN) at a distance of d similar or equal to 98 Mpc. We observed ASASSN-19dj from -21 to 392 d relative to peak ultraviolet (UV)/optical emission using high-cadence, multiwavelength spectroscopy and photometry. From the ASAS-SN g-band data, we determine that the TDE began to brighten on 2019 February 6.8 and for the first 16 d the rise was consistent with a flux proportional to t(2) power law. ASASSN-19dj peaked in the UV/optical on 2019 March 6.5 (MJD = 58548.5) at a bolometric luminosity of L = (6.2 +/- 0.2) x 10(44) erg s(-1). Initially remaining roughly constant in X-rays and slowly fading in the UV/optical, the X-ray flux increased by over an order of magnitude similar to 225 d after peak, resulting from the expansion of the X-ray emitting region. The late-time X-ray emission is well fitted by a blackbody with an effective radius of similar to 1 x 10(12) cm and a temperature of similar to x 10(5) K. The X-ray hardness ratio becomes softer after brightening and then returns to a harder state as the X-rays fade. Analysis of Catalina Real-Time Transient Survey images reveals a nuclear outburst roughly 14.5 yr earlier with a smooth decline and a luminosity of L-V >= 1.4 x 10(43) erg s(-1), although the nature of the flare is unknown. ASASSN-19dj occurred in the most extreme post-starburst galaxy yet to host a TDE, with Lick H delta A = 7.67 +/- 0.17 angstrom.
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