DRAFT
2021-07-01 21:14:00
Type: Object/s-Discovery/Classification
Bibcode: 2021TNSAN.183....1Y
AT2021ehb/ZTF21aanxhjv: Tidal Disruption Event that is Brightening in the X-rays
Authors: Yuhan Yao (Caltech), Murray Brightman (Caltech), Suvi Gezari (STScI), Sjoert van Velzen (Leiden University), Erica Hammerstein (UMD), Jean Somalwar (Caltech), S. R. Kulkarni (Caltech), on behalf of the ZTF Collaboration
Source Group: ZTF
Keywords: TDE, X-rays, Time-domain
Abstract:
We report Swift/XRT detection of X-ray emission in the tidal disruption event (TDE) AT2021ehb/ZTF21aanxhjv.

AT2021ehb was classified as a TDE in a galaxy at z=0.017 by the Zwicky Transient Facility (Gezari et al. 2021, AstroNote 2021-103). Four Swift observations from 2021 March 26 to April 2 showed no X-ray, with an average 3-sigma count rate upper limit of 0.0018 count/s. ZTF observations resumed during June  when the object came back into the night sky. The source has declined in optical flux. A 1.33ks swift observation on July 1 shows the detection of an X-ray source with 0.115 +/- 0.010 count/s. An absorbed blackbody (tbabs*zbbody) model fit to the XRT spectrum suggests a blackbody temperature of 167 +/- 23 eV, and a 0.3--3 keV flux of 1.6e-12 erg/cm^2/s, corresponding to a luminosity of 1.0e+42 erg/s.

 

We plan to continue Swift monitoring and spectroscopic follow-up observations. Further follow-up observations are encouraged.

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 2021ehb [ZTF21aanxhjv] 03:07:47.806 +40:18:40.57 TDE 0.017 WISEA J030747.82+401840.9 03:07:47.806 +40:18:40.57 TDE 0.018

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