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SCAT Uncovers ATLAS's First Tidal Disruption Event ATLAS18mlw: A Faint and Fast TDE in a Quiescent Balmer Strong Galaxy by Hinkle, Jason T.; Tucker, Michael A.; Shappee, Benjamin. J.; Holoien, Thomas W. -S.; Vallely, Patrick J.; de Jaeger, Thomas; Auchettl, Katie; Aldering, Greg; Ashall, Chris; Desai, Dhvanil D.; Do, Aaron; Payne, Anna V.; Tonry, John L. is a scholarly article available to read on EtoBox.

What is SCAT Uncovers ATLAS's First Tidal Disruption Event ATLAS18mlw: A Faint and Fast TDE in a Quiescent Balmer Strong Galaxy about?

We present the discovery that ATLAS18mlw was a tidal disruption event (TDE) in the galaxy WISEA J073544.83+663717.3, at a luminosity distance of 334 Mpc. Initially discovered by the Asteroid Terrestrial Impact Last Alert System (ATLAS) on 2018 March 17.3, the TDE nature of the transient was uncovered only recently with the re-reduction of a SuperNova Integral Field Spectrograph (SNIFS) spectrum. This spectrum, taken by the Spectral Classification of Astronomical Transients (SCAT) survey, shows a strong blue continuum and a broad H$\alpha$ emission line. Here we present roughly six years of optical survey photometry beginning before the TDE to constrain AGN activity, optical spectroscopy of the transient, and a detailed study of the host galaxy properties through analysis of archival photometry and a host spectrum. ATLAS18mlw was detected in ground-based light curves for roughly two months. From a blackbody fit to the transient spectrum and bolometric correction of the optical light curve, we conclude that ATLAS18mlw is best explained by a low-luminosity TDE with a peak luminosity of log(L [erg s$^{-1}$]) = $43.5 \pm 0.2$. The TDE classification is further supported by the quiescent

Author

Hinkle, Jason T.; Tucker, Michael A.; Shappee, Benjamin. J.; Holoien, Thomas W. -S.; Vallely, Patrick J.; de Jaeger, Thomas; Auchettl, Katie; Aldering, Greg; Ashall, Chris; Desai, Dhvanil D.; Do, Aaron; Payne, Anna V.; Tonry, John L.

Published

2022

Language

EN