Kavli Affiliate: Michael M. Fausnaugh
| First 5 Authors: Jason T. Hinkle, Katie Auchettl, Willem B. Hoogendam, Anna V. Payne, Thomas W. -S. Holoien
| Summary:
We present observations of ASASSN-22ci (AT2022dbl), a nearby tidal disruption
event (TDE) discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN)
at a distance of d$_L simeq 125$ Mpc. Roughly two years after the initial
ASAS-SN discovery, a second flare was detected coincident with ASASSN-22ci.
UV/optical photometry and optical spectroscopy indicate that both flares are
likely powered by TDEs. The striking similarity in flare properties suggests
that these flares result from subsequent disruptions of the same star. Each
flare rises on a timescale of $sim$30 days, has a temperature of
$approx$30,000 K, a peak bolometric luminosity of $L_{UV/Opt} = 10^{43.6 –
43.9} textrm{ erg} textrm{ s}^{-1}$, and exhibits a blue optical spectrum
with broad H, He, and N lines. No X-ray emission is detected during either
flare, but X-ray emission with an unabsorbed luminosity of $L_{X} =
3times10^{41} textrm{ erg} textrm{ s}^{-1}$ and $kT = 0.042$ eV is observed
between the flares. Pre-discovery survey observations rule out the existence of
earlier flares within the past $approx$6000 days, indicating that the
discovery of ASASSN-22ci likely coincides with the first flare. If the observed
flare separation of $720 pm 4.7$ days is the orbital period, the next flare of
ASASSN-22ci should occur near MJD 61075 (2026 February 04). Finally, we find
that the existing sample of repeating TDE candidates is consistent with Hills
capture of a star initially in a binary with a total mass between $sim$$1 – 4$
M$_{odot}$ and a separation of $sim$$0.01 – 0.1$ AU.
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