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The First Tidal Disruption Flare in ZTF: From Photometric Selection to Multi-wavelength Characterization
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Number of Authors: 402019 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 872, no 2, article id 198Article in journal (Refereed) Published
Abstract [en]

We present Zwicky Transient Facility (ZTF) observations of the tidal disruption flare AT2018zr/PS18kh reported by Holoien et al. and detected during ZTF commissioning. The ZTF light curve of the tidal disruption event (TDE) samples the rise-to-peak exceptionally well, with 50. days of g- and r-band detections before the time of maximum light. We also present our multi-wavelength follow-up observations, including the detection of a thermal (kT approximate to 100 eV) X-ray source that is two orders of magnitude fainter than the contemporaneous optical/UV blackbody luminosity, and a stringent upper limit to the radio emission. We use observations of 128 known active galactic nuclei (AGNs) to assess the quality of the ZTF astrometry, finding a median host-flare distance of 0.'' 2 for genuine nuclear flares. Using ZTF observations of variability from known AGNs and supernovae we show how these sources can be separated from TDEs. A combination of light-curve shape, color, and location in the host galaxy can be used to select a clean TDE sample from multi-band optical surveys such as ZTF or the Large Synoptic Survey Telescope.

Place, publisher, year, edition, pages
2019. Vol. 872, no 2, article id 198
Keywords [en]
accretion, accretion disks, galaxies: nuclei
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-167517DOI: 10.3847/1538-4357/aafe0cISI: 000460814000021OAI: oai:DiVA.org:su-167517DiVA, id: diva2:1305983
Available from: 2019-04-21 Created: 2019-04-21 Last updated: 2019-04-21Bibliographically approved

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Miller-Jones, James C. A.Huppenkothen, DanielaSollerman, JesperNeill, James D.
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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