The Tidal Disruption Event AT 2018hyz II: Light Curve Modeling of a Partially Disrupted Star

Understand

AT 2018hyz (=ASASSN-18zj) is a tidal disruption event (TDE) located in the nucleus of a quiescent E+A galaxy at a redshift of $z = 0.04573$, first detected by the All-Sky Automated Survey for Supernovae (ASAS-SN).

• We present optical+UV photometry of the transient, as well as an X-ray spectrum and radio upper limits.
• The bolometric light curve of AT 2018hyz is comparable to other known TDEs and declines at a rate consistent with a $t^{-5/3}$ at early times, emitting a total radiated energy of $E = 9\times10^{50}$ erg.
• An excess bump appears in the UV light curve about 50 days after bolometric peak, followed by a flattening beyond 250 days.