Keck/LRIS Spectroscopic Classification of AT2019qiz as a Tidal Disruption Event

ATel #13131; M. R. Siebert, E. Strasburger, C. Rojas-Bravo, R. J. Foley (UCSC)
on 25 Sep 2019; 18:47 UT
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Credential Certification: Matthew Siebert (msiebert@ucsc.edu)

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We report the following classification of AT2019qiz as a rising tidal disruption event from spectroscopic observations with the LRIS spectrograph on the Keck I telescope. The target was supplied by the ALeRCE broker using ZTF data. All observations were obtained on 2019 Sep 25 UT.

 
Name         | IAU Name  | RA (J2000)  | Dec (J2000)  | z      | Type  | Phase    | Notes
 
ZTF19abzrhgq | AT2019qiz | 04:46:37.88 | -10:13:34.92 | 0.0151 | TDE   | premax  | (1) 
 

Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) The spectrum is very blue, peaking blueward of 3200 A in the rest frame. Superposed on the continuum are several emission features, including He II 4686 and Balmer lines. We measure a He II 4686 FWHM of 17,700 km/s, and a H-alpha FWHM of 13,200 km/s. Assuming AT2019qiz is at a distance of 65 Mpc, it currently has an absolute g-band magnitude of Mg ~ -17.5 mag. The ZTF light curve indicates that the TDE is young and still increasing in brightness.