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SN2018kzr :
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McBrien, Owen R.
(author)
SN2018kzr : A Rapidly Declining Transient from the Destruction of a White Dwarf
- Article/chapterEnglish2019
Publisher, publication year, extent ...
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2019-10-31
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American Astronomical Society,2019
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:su-176569
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-176569URI
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https://doi.org/10.3847/2041-8213/ab4daeDOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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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 & xfffd;=& xfffd;?17.98, a peak bolometric luminosity of ?1.4 & xfffd;& x5e0;10(43) erg s(?1), and a rapid decline rate of 0.48 & xfffd;& xfffd;0.03 mag day(?1) in the r band. The bolometric luminosity evolves too quickly to be explained by pure Ni-56 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 & xfffd;=& xfffd;0.10 & xfffd;& xfffd;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.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Smartt, Stephen J.
(author)
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Chen, Ting-Wan
(author)
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Inserra, Cosimo
(author)
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Gillanders, James H.
(author)
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Sim, Stuart A.
(author)
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Jerkstrand, Anders
(author)
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Rest, Armin
(author)
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Valenti, Stefano
(author)
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Roy, Rupak
(author)
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Gromadzki, Mariusz
(author)
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Taubenberger, Stefan
(author)
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Flörs, Andreas
(author)
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Huber, Mark E.
(author)
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Chambers, Ken C.
(author)
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Gal-Yam, Avishay
(author)
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Young, David R.
(author)
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Nicholl, Matt
(author)
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Kankare, Erkki
(author)
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Smith, Ken W.
(author)
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Maguire, Kate
(author)
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Mandel, Ilya
(author)
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Prentice, Simon
(author)
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Rodríguez, Ósmar
(author)
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Pineda Garcia, Jonathan
(author)
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Gutiérrez, Claudia P.
(author)
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Galbany, Lluís
(author)
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Barbarino, CristinaStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)cbarb
(author)
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Clark, Peter S. J.
(author)
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Sollerman, JesperStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)solle
(author)
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Kulkarni, Shrinivas R.
(author)
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De, Kishalay
(author)
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Buckley, David A. H.
(author)
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Rau, Arne
(author)
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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
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In:Astrophysical Journal Letters: American Astronomical Society885:12041-82052041-8213
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McBrien, Owen R.
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Smartt, Stephen ...
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Chen, Ting-Wan
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Inserra, Cosimo
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Gillanders, Jame ...
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Sim, Stuart A.
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Jerkstrand, Ande ...
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Rest, Armin
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Valenti, Stefano
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Roy, Rupak
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Gromadzki, Mariu ...
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Taubenberger, St ...
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Flörs, Andreas
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Huber, Mark E.
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Chambers, Ken C.
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Gal-Yam, Avishay
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Young, David R.
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Nicholl, Matt
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Kankare, Erkki
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Smith, Ken W.
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Maguire, Kate
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Mandel, Ilya
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Prentice, Simon
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Rodríguez, Ósmar
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Pineda Garcia, J ...
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Gutiérrez, Claud ...
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Galbany, Lluís
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Barbarino, Crist ...
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Clark, Peter S. ...
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Sollerman, Jespe ...
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Kulkarni, Shrini ...
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De, Kishalay
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Buckley, David A ...
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Rau, Arne
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Stockholm University