Discovery and follow-up of ASASSN-19dj: an X-ray and UV luminous TDE in an extreme post-starburst galaxy
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Discovery and follow-up of ASASSN-19dj : an X-ray and UV luminous TDE in an extreme post-starburst galaxy. / Hinkle, Jason T.; Holoien, T. W-S; Auchettl, K.; Shappee, B. J.; Neustadt, J. M. M.; Payne, A.; 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.
In: Monthly Notices of the Royal Astronomical Society, Vol. 500, No. 2, 15.01.2021, p. 1673-1696.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Discovery and follow-up of ASASSN-19dj
T2 - an X-ray and UV luminous TDE in an extreme post-starburst galaxy
AU - Hinkle, Jason T.
AU - Holoien, T. W-S
AU - Auchettl, K.
AU - Shappee, B. J.
AU - Neustadt, J. M. M.
AU - Payne, A.
AU - Brown, J. S.
AU - Kochanek, C. S.
AU - Stanek, K. Z.
AU - Graham, M. J.
AU - Tucker, M. A.
AU - Do, A.
AU - Anderson, J. P.
AU - Bose, S.
AU - Chen, P.
AU - Coulter, D. A.
AU - Dimitriadis, G.
AU - Dong, Subo
AU - Foley, R. J.
AU - Huber, M. E.
AU - Hung, T.
AU - Kilpatrick, C. D.
AU - Pignata, G.
AU - Piro, A. L.
AU - Rojas-Bravo, C.
AU - Siebert, M. R.
AU - Stalder, B.
AU - Thompson, Todd A.
AU - Tonry, J. L.
AU - Vallely, P. J.
AU - Wisniewski, J. P.
PY - 2021/1/15
Y1 - 2021/1/15
N2 - 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.
AB - 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.
KW - accretion, accretion discs
KW - black hole physics
KW - galaxies: nuclei
KW - TIDAL DISRUPTION EVENT
KW - SUPERMASSIVE BLACK-HOLES
KW - DIGITAL SKY SURVEY
KW - HOST GALAXIES
KW - SPECTROSCOPIC EVOLUTION
KW - STAR
KW - EMISSION
KW - CLASSIFICATION
KW - OUTBURST
KW - CALIBRATION
U2 - 10.1093/mnras/staa3170
DO - 10.1093/mnras/staa3170
M3 - Journal article
VL - 500
SP - 1673
EP - 1696
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 2
ER -
ID: 260407537