DRAFT
2026-05-30 08:25:43
Type: Object/s-Discovery/Classification
ZTF classification of ZTF26aavrgaw / AT2026nuq and ZTF26aasemes / AT2026kce as likely TDEs
Authors: Erica Hammerstein (UC Berkeley), Ryan Chornock (UC Berkeley), Itai Sfaradi (UC Berkeley), Jonathan Carney (UNC), Robert Stein (UMD), on behalf of the ZTF AGN/TDE working group
Source Group: ZTF
Abstract:
We report the classification of the optical transients ZTF26aavrgaw / AT2026nuq and ZTF26aasemes / AT2026kce as likely TDEs. The sources were selected by the tdescore ML classifier (Stein+2024, doi: 10.3847/2041-8213/ad3337) as candidate TDEs primarily due to their persistent blue color, spectroscopic features, and the lack of AGN-like host signatures.

ZTF26aavrgaw / AT2026nuq was first detected by ZTF on 2026-05-10 as an alert with a detection of g = 20.503 AB mag. Forced photometry reveals detections as early as 2026-05-07, with a color of g-r = -0.366 mag. It was reported as a transient to TNS on 2026-05-28. The candidate was identified as a likely TDE by tdescore, and assigned for spectroscopic follow-up. We obtained an optical spectrum on 2026-05-24 with the Kast spectrograph on the Shane telescope, which revealed a blue continuum and broad features consistent with Halpha and He II emission at z=0.16, in line with the TDE-H+He class. No narrow emission lines are detected from the host galaxy. The transient is now post-peak with g-r = -0.182 mag. With these observations, coupled with the persistent blue light curve, we classify ZTF26aavrgaw / AT2026nuq as a likely TDE.

ZTF26aasemes / AT2026kce was first detected by ZTF on 2026-04-09 as an alert with a detection of r = 20.354 AB mag. Forced photometry reveals further r-band detections on 2026-04-05. It was reported as a transient to TNS on 2026-04-09. The candidate was identified as a likely TDE by tdescore, and assigned for spectroscopic follow-up. We obtained optical spectra on 2026-05-11 and 2026-05-24 with the Kast spectrograph on the Shane telescope, both of which revealed a persistent blue continuum and possible low amplitude broad features near lambda_obs ~ 7740 A, which may be consistent with Halpha at z~0.18. The transient is now post-peak with r = 19.439 mag. With these observations, coupled with the persistent blue light curve, we classify ZTF26aasemes / AT2026kce as a likely TDE.

Based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Award #2407588 and a partnership including Caltech, USA; Caltech/IPAC, USA; University of Maryland, USA; University of California, Berkeley, USA; University of Wisconsin at Milwaukee, USA; Cornell University, USA; Drexel University, USA; University of North Carolina at Chapel Hill, USA; Institute of Science and Technology, Austria; National Central University, Taiwan; Operations are conducted by Caltech's Optical Observatory (COO), Caltech/IPAC, and the University of Washington at Seattle, USA.

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2026nuq [ZTF26aavrgaw] 14:43:37.083 +58:53:08.27 TDE-H-He 0.16 14:43:37.083 +58:53:08.27 TDE-H-He 0.16
TNS 2026kce [ZTF26aasemes] 08:51:41.457 +42:50:34.82 TDE-H 0.18 08:51:41.457 +42:50:34.82 TDE-H 0.18

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