AT2021acak: a candidate tidal disruption event found in the Zwicky Transient Facility survey
arXiv:2206.13148 · doi:10.1088/1674-4527/acae6f
Abstract
We report a candidate tidal disruption event (TDE) found in the Zwicky Transient Facility (ZTF) survey data. This candidate, with its transient name AT2021acak, showed brightness increases of 1\,mag around MJD~59500 and subsequent power-law--like brightness declines. We have conducted multiple optical spectroscopic observations with the 2.4-m Lijiang telescope and one observation at X-ray and ultraviolet (UV) bands with the {\it Neil Gehrels Swift Observatory (Swift)}. The optical spectra of the source show broad H and He emission line and Fe emission features. Possible 0.3--2\,keV X-ray and bright UV emission of the source was detected. We analyze the declines of the optical light curves, the emission features of the optical spectra, and the constructed broad-band UV and optical spectrum. The properties derived from the analyses are consistent with those of reported (candidate) TDEs, and in particular very similar to those of ASASSN-18jd. The identification is complicated by the host being likely an AGN, and thus further observations of the event and quiescent host are required in order to have a clear understanding of the nature of this transient event.
arXiv comment11 pages, 6 figures, 2 tables, accepted for publication in RAA
References in corpus (36)
- emcee: The MCMC Hammer
- The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
- Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
- The Zwicky Transient Facility: System Overview, Performance, and First Results
- Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs
- HI4PI: A full-sky HI survey based on EBHIS and GASS
- ATLAS: A High-Cadence All-Sky Survey System
- Photometric Calibration of the Swift Ultraviolet/Optical Telescope
- An online repository of Swift/XRT light curves of GRBs
- Stellar Population Inference with Prospector
- Optical Flares from the Tidal Disruption of Stars by Massive Black Holes
- A Continuum of H- to He-Rich Tidal Disruption Candidates With a Preference for E+A Galaxies
- Tidal Disruption Events
- Seventeen Tidal Disruption Events from the First Half of ZTF Survey Observations: Entering a New Era of Population Studies
- A unified model for tidal disruption events
- Multiband lightcurves of tidal disruption events
- PS1-10jh: The Disruption of a Main-Sequence Star of Near-Solar Composition
- ASASSN-14ae: A Tidal Disruption Event at 200 Mpc
- Weighing Black Holes using Tidal Disruption Events
- Large-Amplitude X-ray Outbursts from Galactic Nuclei: A Systematic Survey Using ROSAT Archival Data
- 2SXPS: An improved and expanded Swift X-ray telescope point source catalog
- The Automatic Learning for the Rapid Classification of Events (ALeRCE) Alert Broker
- PS16dtm: A Tidal Disruption Event in a Narrow-line Seyfert 1 Galaxy
- Alert Classification for the ALeRCE Broker System: The Light Curve Classifier
- Tidal Disruption Event (TDE) Demographics
- Extreme Coronal Line Emitters: Tidal Disruption of Stars by Massive Black Holes in Galactic Nuclei?
- A new class of flares from accreting supermassive black holes
- Lijiang 2.4-meter Telescope and its Instruments
- Partial Stellar Disruption by a Supermassive Black Hole: Is the Lightcurve Really Proportional to ?
- Hot dust in Panchromatic SED Fitting: Identification of AGN and improved galaxy properties
- Infrared Echoes of Optical Tidal Disruption Events: ~1% Dust Covering Factor or Less at sub-parsec Scale
- To TDE or not to TDE: The luminous transient ASASSN-18jd with TDE-like and AGN-like qualities
- Reverberation in tidal disruption events: dust echoes, coronal emission lines, multi-wavelength cross-correlations, and QPOs
- Discovery of ATLAS17jrp as an Optical, X-ray and Infrared Bright TDE in a Star-forming Galaxy
- Classification Study of WISE Infrared Sources: Identification of Candidate Asymptotic Giant Branch Stars
- An Extraordinary Response of Iron Emission to the Central Outburst in a Tidal Disruption Event Candidate