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    AT 2017gbl: A dust obscured TDE candidate in a luminous infrared galaxy

    90128.pdf (5.932Mb)
    Access Status
    Open access
    Authors
    Kool, E.C.
    Reynolds, T.M.
    Mattila, S.
    Kankare, E.
    Pérez-Torres, M.A.
    Efstathiou, A.
    Ryder, S.
    Romero-Cañizales, C.
    Lu, W.
    Heikkilä, T.
    Anderson, Gemma
    Berton, M.
    Bright, J.
    Cannizzaro, G.
    Eappachen, D.
    Fraser, M.
    Gromadzki, M.
    Jonker, P.G.
    Kuncarayakti, H.
    Lundqvist, P.
    Maeda, K.
    Mcdermid, R.M.
    Medling, A.M.
    Moran, S.
    Reguitti, A.
    Shahbandeh, M.
    Tsygankov, S.
    Lebouteiller, V.
    Wevers, T.
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Kool, E.C. and Reynolds, T.M. and Mattila, S. and Kankare, E. and Pérez-Torres, M.A. and Efstathiou, A. and Ryder, S. et al. 2020. AT 2017gbl: A dust obscured TDE candidate in a luminous infrared galaxy. Monthly Notices of the Royal Astronomical Society. 498 (2): pp. 2167-2195.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/staa2351
    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/DE180100346
    http://purl.org/au-research/grants/arc/DP200102471
    http://purl.org/au-research/grants/arc/FT150100333
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/90304
    Collection
    • Curtin Research Publications
    Abstract

    We present the discovery with Keck of the extremely infrared (IR) luminous transient AT 2017gbl, coincident with the Northern nucleus of the luminous infrared galaxy (LIRG) IRAS 23436+5257. Our extensive multiwavelength follow-up spans ∼900 d, including photometry and spectroscopy in the optical and IR, and (very long baseline interferometry) radio and X-ray observations. Radiative transfer modelling of the host galaxy spectral energy distribution and long-term pre-outburst variability in the mid-IR indicate the presence of a hitherto undetected dust obscured active galactic nucleus (AGN). The optical and near-IR spectra show broad ∼2000 km s-1 hydrogen, He i, and O i emission features that decrease in flux over time. Radio imaging shows a fast evolving compact source of synchrotron emission spatially coincident with AT 2017gbl. We infer a lower limit for the radiated energy of 7.3 × 1050 erg from the IR photometry. An extremely energetic supernova would satisfy this budget, but is ruled out by the radio counterpart evolution. Instead, we propose AT 2017gbl is related to an accretion event by the central supermassive black hole, where the spectral signatures originate in the AGN broad line region and the IR photometry is consistent with re-radiation by polar dust. Given the fast evolution of AT 2017gbl, we deem a tidal disruption event (TDE) of a star a more plausible scenario than a dramatic change in the AGN accretion rate. This makes AT 2017gbl the third TDE candidate to be hosted by a LIRG, in contrast to the so far considered TDE population discovered at optical wavelengths and hosted preferably by post-starburst galaxies.

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