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    A radio-emitting outflow produced by the tidal disruption event AT2020vwl

    96204.pdf (4.230Mb)
    Access Status
    Open access
    Authors
    Goodwin, Adelle
    Alexander, K.D.
    Miller-Jones, James
    Bietenholz, M.F.
    van Velzen, S.
    Anderson, Gemma
    Berger, E.
    Cendes, Y.
    Chornock, R.
    Coppejans, D.L.
    Eftekhari, T.
    Gezari, S.
    Laskar, T.
    Ramirez-Ruiz, E.
    Saxton, R.
    Date
    2023
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Goodwin, A.J. and Alexander, K.D. and Miller-Jones, J.C.A. and Bietenholz, M.F. and van Velzen, S. and Anderson, G.E. and Berger, E. et al. 2023. A radio-emitting outflow produced by the tidal disruption event AT2020vwl. Monthly Notices of the Royal Astronomical Society. 522 (4): pp. 5084-5097.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stad1258
    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/DP200102471
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2023 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/96440
    Collection
    • Curtin Research Publications
    Abstract

    A tidal disruption event (TDE) occurs when a star is destroyed by a supermassive black hole. Broad-band radio spectral observations of TDEs trace the emission from any outflows or jets that are ejected from the vicinity of the supermassive black hole. However, radio detections of TDEs are rare, with <20 published to date, and only 11 with multi-epoch broad-band coverage. Here we present the radio detection of the TDE AT2020vwl and our subsequent radio monitoring campaign of the outflow that was produced, spanning 1.5 yr post-optical flare. We tracked the outflow evolution as it expanded between 1016 and 1017 cm from the supermassive black hole, deducing it was non-relativistic and launched quasi-simultaneously with the initial optical detection through modelling the evolving synchrotron spectra of the event. We deduce that the outflow is likely to have been launched by material ejected from stream-stream collisions (more likely), the unbound debris stream, or an accretion-induced wind or jet from the supermassive black hole (less likely). AT2020vwl joins a growing number of TDEs with well-characterized prompt radio emission, with future timely radio observations of TDEs required to fully understand the mechanism that produces this type of radio emission in TDEs.

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