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SN2018kzr: a rapidly declining transient from the destruction of a white dwarf

McBrien, Owen R. and Kulkarni, Shrinivas R. and De, Kishalay (2019) SN2018kzr: a rapidly declining transient from the destruction of a white dwarf. Astrophysical Journal Letters, 885 (1). Art. No. L23. ISSN 2041-8213. https://resolver.caltech.edu/CaltechAUTHORS:20191007-140649649

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Abstract

We present SN2018kzr, the fastest declining supernova-like transient, second only to the kilonova, AT2017gfo. SN2018kzr is characterized by a peak magnitude of M_r = −17.98, a peak bolometric luminosity of ~1.4 × 10⁴³ erg s⁻¹, and a rapid decline rate of 0.48 ± 0.03 mag day⁻¹ in the r band. The bolometric luminosity evolves too quickly to be explained by pure ⁵⁶Ni heating, necessitating the inclusion of an alternative powering source. Incorporating the spin-down of a magnetized neutron star adequately describes the lightcurve and we estimate a small ejecta mass of M_(ej) = 0.10 ± 0.05 M⊙. Our spectral modeling suggests the ejecta is composed of intermediate mass elements including O, Si, and Mg and trace amounts of Fe-peak elements, which disfavors a binary neutron star merger. We discuss three explosion scenarios for SN2018kzr, given the low ejecta mass, intermediate mass element composition, and high likelihood of additional powering—the core collapse of an ultra-stripped progenitor, the accretion induced collapse (AIC) of a white dwarf, and the merger of a white dwarf and neutron star. The requirement for an alternative input energy source favors either the AIC with magnetar powering or a white dwarf–neutron star merger with energy from disk wind shocks.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/2041-8213/ab4daeDOIArticle
https://arxiv.org/abs/1909.04545arXivDiscussion Paper
ORCID:
AuthorORCID
McBrien, Owen R.0000-0001-8049-4036
Kulkarni, Shrinivas R.0000-0001-5390-8563
De, Kishalay0000-0002-8989-0542
Additional Information:© 2019 The American Astronomical Society. Received 2019 September 6; revised 2019 October 7; accepted 2019 October 15; published 2019 October 31. Based in part on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere, Chile as part of the extended Public ESO Spectroscopic Survey for Transient Objects (ePESSTO), program 199.D-0143, the SALT Large Science Programme on transients (2018-2-LSP-001), MNiSW DIR/WK/2016/07, GROND support through DFG grant HA 1850/28-1. ATLAS is supported primarily through NASA grant NN12AR55G, 80NSSC18K1575. This research made use of TARDIS supported by the Google Summer of Code, ESA's Summer of Code in Space program. Funding acknowledgments: STFC ST/P000312/1 (SJS, SAS); Alexander von Humboldt Foundation (TWC); ERC and H2020 MSC grants [615929, 725161, 758638] (A.G.Y., C.P.G., K.M., and L.G.); ISF GW excellence center, IMOS, BSF Transformative program, Benoziyo Endowment Fund for the Advancement of Science, Deloro Institute, Veronika A. Rabl Physics Discretionary Fund, Paul and Tina Gardner and the WIS-CIT, Helen and Martin Kimmel Award (AGY); RAS Research Fellowship (MN), Polish NCN MAESTRO grant 2014/14/A/ST9/00121 (MG), IC120009 "Millennium Institute of Astrophysics" of the Iniciativa Científica Milenio del Ministerio Economía, Fomento y Turismo de Chile and CONICYT PAI/INDUSTRIA 79090016 (OR); NRF South Africa (DAHB) lasair is supported by STFC grants ST/N002512/1 and ST/N002520/1. Facilities: ESO (NTT - , VLT) - , Gemini (GMOS) - , Keck (LRIS) - , SALT (RSS) - , Swift (XRT and UVOT) - , SALT - , - Max Planck:2.2m, ATLAS - , ZTF - , Liverpool:2m (IO:O) - , LCO. -
Group:Zwicky Transient Facility
Funders:
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)HA 1850/28-1
NASANN12AR55G
NASA80NSSC18K1575
GoogleUNSPECIFIED
European Space Agency (ESA)UNSPECIFIED
Science and Technology Facilities Council (STFC)ST/P000312/1
Alexander von Humboldt FoundationUNSPECIFIED
European Research Council (ERC)615929
European Research Council (ERC)725161
European Research Council (ERC)758638
Israel Science FoundationUNSPECIFIED
Ministry of Science (Israel)UNSPECIFIED
Binational Science Foundation (USA-Israel)UNSPECIFIED
Benoziyo Endowment FundUNSPECIFIED
Deloro InstituteUNSPECIFIED
Veronika A. Rabl Physics Discretionary FundUNSPECIFIED
Paul and Tina GardnerUNSPECIFIED
Helen and Martin Kimmel AwardUNSPECIFIED
Russian Academy of SciencesUNSPECIFIED
National Science Centre (Poland)2014/14/A/ST9/00121
Iniciativa Científica Milenio del Ministerio de Economía, Fomento y TurismoIC120009
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)79090016
National Research Foundation (South Africa)UNSPECIFIED
Science and Technology Facilities Council (STFC)ST/N002512/1
Science and Technology Facilities Council (STFC)ST/N002520/1
Subject Keywords:Magnetars; Supernovae; White dwarf stars
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Magnetars (992); Supernovae (1668); White dwarf stars (1799)
Record Number:CaltechAUTHORS:20191007-140649649
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20191007-140649649
Official Citation:Owen R. McBrien et al 2019 ApJL 885 L23
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99120
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Oct 2019 22:23
Last Modified:31 Oct 2019 20:12

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