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Hinkle, Jason T; Holoien, T W-S; Auchettl, K; Shappee, B J; Neustadt, J M M; Payne, A V; Brown, J S; Kochanek, C S; Stanek, K Z; Graham, M J; Tucker, M A; Do, A; Anderson, J P; Bose, S; Chen, P; Coulter, D A; Dimitriadis, G; Dong, Subo; Foley, R J; Huber, M E; Hung, T; Kilpatrick, C D; Pignata, G; Piro, A L; Rojas-Bravo, C; Siebert, M R; Stalder, B; Thompson, Todd A; Tonry, J L; Vallely, P J; Wisniewski, J P
Monthly Notices of the Royal Astronomical Society, 01/2021, Letnik: 500, Številka: 2Journal Article
ABSTRACT 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 ≃ 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 ∝t2 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) × 1044 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 ∼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 ∼1 × 1012 cm and a temperature of ∼6 × 105 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 LV ≥ 1.4 × 1043 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 HδA = 7.67 ± 0.17 Å.
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