TNS Classification Report No. 12040 [ 2022TNSCR.620....1Y ]
Date Received (UTC): 2022-03-05 18:45:49 Sender: Yuhan Yao
Group: ZTF
Yuhan Yao, Matthew Graham, Antonio Rodriguez, Jean Somalwar (Caltech), Sjoert van Velzen (Leiden University), Suvi Gezari (STScI), Erica Hammerstein (UMD) report/s a classification of object: TDE 2021lo
Type: TDERedshift: 0.152
Remarks: In a retrospective search of tidal disruption event (TDE) candidates in the ZTF database, we selected ZTF21aabiipy/AT2021lo as a TDE candidate based on its light curve properties (long rise time, no sign of cooling, post-peak plateau). A Keck/LRIS spectrum was obtained on 2022 Feb 25, roughly one year after the peak of this optical transient. We observed broad emission lines of Halpha and He II complex at z=0.152, suggesting that AT2021lo is a TDE-H+He. We also observed host galaxy lines of [N II] emission and Ca II absorption at the same redshift.
The following Classification spectrum was provided:
Obsdate: 2022-02-25 05:17:13
Instrument: LRIS
Telescope: Keck I 10m
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2021lo
Date Received (UTC): 2022-03-05 18:45:49 Sender: Yuhan Yao
Group: ZTF
Yuhan Yao, Matthew Graham, Antonio Rodriguez, Jean Somalwar (Caltech), Sjoert van Velzen (Leiden University), Suvi Gezari (STScI), Erica Hammerstein (UMD) report/s a classification of object: TDE 2021lo
Type: TDERedshift: 0.152
Remarks: In a retrospective search of tidal disruption event (TDE) candidates in the ZTF database, we selected ZTF21aabiipy/AT2021lo as a TDE candidate based on its light curve properties (long rise time, no sign of cooling, post-peak plateau). A Keck/LRIS spectrum was obtained on 2022 Feb 25, roughly one year after the peak of this optical transient. We observed broad emission lines of Halpha and He II complex at z=0.152, suggesting that AT2021lo is a TDE-H+He. We also observed host galaxy lines of [N II] emission and Ca II absorption at the same redshift.
The following Classification spectrum was provided:
Obsdate: 2022-02-25 05:17:13
Instrument: LRIS
Telescope: Keck I 10m
Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2021lo