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    Evidence for rapid disc formation and reprocessing in the X-ray bright tidal disruption event candidate at 2018fyk

    80250.pdf (4.989Mb)
    Access Status
    Open access
    Authors
    Wevers, T.
    Pasham, D.R.
    van Velzen, S.
    Leloudas, G.
    Schulze, S.
    Miller-Jones, James
    Jonker, P.G.
    Gromadzki, M.
    Kankare, E.
    Hodgkin, S.T.
    Wyrzykowski
    Kostrzewa-Rutkowska, Z.
    Moran, S.
    Berton, M.
    Maguire, K.
    Onori, F.
    Mattila, S.
    Nicholl, M.
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Wevers, T. and Pasham, D.R. and van Velzen, S. and Leloudas, G. and Schulze, S. and Miller-Jones, J.C.A. and Jonker, P.G. et al. 2019. Evidence for rapid disc formation and reprocessing in the X-ray bright tidal disruption event candidate at 2018fyk. Monthly Notices of the Royal Astronomical Society. 488 (4): pp. 4816-4830.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stz1976
    ISSN
    0035-8711
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT140101082
    Remarks

    Copyright © 2019 The American Astronomical Society. All rights reserved.

    null

    URI
    http://hdl.handle.net/20.500.11937/80168
    Collection
    • Curtin Research Publications
    Abstract

    © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society We present optical spectroscopic and Swift UVOT/XRT observations of the X-ray and UV/optical bright tidal disruption event (TDE) candidate AT 2018fyk/ASASSN-18ul discovered by ASAS-SN. The Swift light curve is atypical for a TDE, entering a plateau after ∼40 d of decline from peak. After 80 d the UV/optical light curve breaks again to decline further, while the X-ray emission becomes brighter and harder. In addition to broad H, He, and potentially O/Fe lines, narrow emission lines emerge in the optical spectra during the plateau phase. We identify both high-ionization (O III) and low-ionization (Fe II) lines, which are visible for ∼45 d. We similarly identify Fe II lines in optical spectra of ASASSN-15oi 330 d after discovery, indicating that a class of Fe-rich TDEs exists. The spectral similarity between AT 2018fyk, narrow-line Seyfert 1 galaxies, and some extreme coronal line emitters suggests that TDEs are capable of creating similar physical conditions in the nuclei of galaxies. The Fe II lines can be associated with the formation of a compact accretion disc, as the emergence of low-ionization emission lines requires optically thick, high-density gas. Taken together with the plateau in X-ray and UV/optical luminosity this indicates that emission from the central source is efficiently reprocessed into UV/optical wavelengths. Such a two-component light curve is very similar to that seen in the TDE candidate ASASSN-15lh, and is a natural consequence of a relativistic orbital pericentre.

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