SN2018kzr: A Rapidly Declining Transient from the Destruction of a White Dwarf

Owen R. McBrien; Stephen J. Smartt; Ting Wan Chen; Cosimo Inserra; James H. Gillanders; Stuart A. Sim; Anders Jerkstrand; Armin Rest; Stefano Valenti; Rupak Roy; Mariusz Gromadzki; Stefan Taubenberger; Andreas Flörs; Mark E. Huber; Ken C. Chambers; Avishay Gal-Yam; David R. Young; Matt Nicholl; Erkki Kankare; Ken W. Smith; Kate Maguire; Ilya Mandel; Simon Prentice; Ósmar Rodríguez; Jonathan Pineda Garcia; Claudia P. Gutiérrez; Lluís Galbany; Cristina Barbarino; Peter S.J. Clark; Jesper Sollerman; Shrinivas R. Kulkarni; Kishalay De; David A.H. Buckley; Arne Rau

doi:10.3847/2041-8213/ab4dae

SN2018kzr: A Rapidly Declining Transient from the Destruction of a White Dwarf

Owen R. McBrien, Stephen J. Smartt, Ting Wan Chen, Cosimo Inserra, James H. Gillanders, Stuart A. Sim, Anders Jerkstrand, Armin Rest, Stefano Valenti, Rupak Roy, Mariusz Gromadzki, Stefan Taubenberger, Andreas Flörs, Mark E. Huber, Ken C. Chambers, Avishay Gal-Yam, David R. Young, Matt Nicholl, Erkki Kankare, Ken W. SmithKate Maguire, Ilya Mandel, Simon Prentice, Ósmar Rodríguez, Jonathan Pineda Garcia, Claudia P. Gutiérrez, Lluís Galbany, Cristina Barbarino, Peter S.J. Clark, Jesper Sollerman, Shrinivas R. Kulkarni, Kishalay De, David A.H. Buckley, Arne Rau

Department of Particle Physics and Astrophysics

Weizmann Institute of Science

Research output: Contribution to journal › Article › peer-review

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 _o. 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.

Original language	English
Article number	L23
Number of pages	9
Journal	Astrophysical Journal Letters
Volume	885
Issue number	1
DOIs	https://doi.org/10.3847/2041-8213/ab4dae
State	Published - 1 Nov 2019

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/2041-8213/ab4dae

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McBrien, O. R., Smartt, S. J., Chen, T. W., Inserra, C., Gillanders, J. H., Sim, S. A., Jerkstrand, A., Rest, A., Valenti, S., Roy, R., Gromadzki, M., Taubenberger, S., Flörs, A., Huber, M. E., Chambers, K. C., Gal-Yam, A., Young, D. R., Nicholl, M., Kankare, E., ... Rau, A. (2019). SN2018kzr: A Rapidly Declining Transient from the Destruction of a White Dwarf. Astrophysical Journal Letters, 885(1), Article L23. https://doi.org/10.3847/2041-8213/ab4dae

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title = "SN2018kzr: A Rapidly Declining Transient from the Destruction of a White Dwarf",

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 o. 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.",

author = "McBrien, {Owen R.} and Smartt, {Stephen J.} and Chen, {Ting Wan} and Cosimo Inserra and Gillanders, {James H.} and Sim, {Stuart A.} and Anders Jerkstrand and Armin Rest and Stefano Valenti and Rupak Roy and Mariusz Gromadzki and Stefan Taubenberger and Andreas Fl{\"o}rs and Huber, {Mark E.} and Chambers, {Ken C.} and Avishay Gal-Yam and Young, {David R.} and Matt Nicholl and Erkki Kankare and Smith, {Ken W.} and Kate Maguire and Ilya Mandel and Simon Prentice and {\'O}smar Rodr{\'i}guez and Garcia, {Jonathan Pineda} and Guti{\'e}rrez, {Claudia P.} and Llu{\'i}s Galbany and Cristina Barbarino and Clark, {Peter S.J.} and Jesper Sollerman and Kulkarni, {Shrinivas R.} and Kishalay De and Buckley, {David A.H.} and Arne Rau",

year = "2019",

month = nov,

day = "1",

doi = "10.3847/2041-8213/ab4dae",

language = "الإنجليزيّة",

volume = "885",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

number = "1",

}

McBrien, OR, Smartt, SJ, Chen, TW, Inserra, C, Gillanders, JH, Sim, SA, Jerkstrand, A, Rest, A, Valenti, S, Roy, R, Gromadzki, M, Taubenberger, S, Flörs, A, Huber, ME, Chambers, KC, Gal-Yam, A, Young, DR, Nicholl, M, Kankare, E, Smith, KW, Maguire, K, Mandel, I, Prentice, S, Rodríguez, Ó, Garcia, JP, Gutiérrez, CP, Galbany, L, Barbarino, C, Clark, PSJ, Sollerman, J, Kulkarni, SR, De, K, Buckley, DAH & Rau, A 2019, 'SN2018kzr: A Rapidly Declining Transient from the Destruction of a White Dwarf', Astrophysical Journal Letters, vol. 885, no. 1, L23. https://doi.org/10.3847/2041-8213/ab4dae

TY - JOUR

T1 - SN2018kzr

T2 - A Rapidly Declining Transient from the Destruction of a White Dwarf

AU - McBrien, Owen R.

AU - Smartt, Stephen J.

AU - Chen, Ting Wan

AU - Inserra, Cosimo

AU - Gillanders, James H.

AU - Sim, Stuart A.

AU - Jerkstrand, Anders

AU - Rest, Armin

AU - Valenti, Stefano

AU - Roy, Rupak

AU - Gromadzki, Mariusz

AU - Taubenberger, Stefan

AU - Flörs, Andreas

AU - Huber, Mark E.

AU - Chambers, Ken C.

AU - Gal-Yam, Avishay

AU - Young, David R.

AU - Nicholl, Matt

AU - Kankare, Erkki

AU - Smith, Ken W.

AU - Maguire, Kate

AU - Mandel, Ilya

AU - Prentice, Simon

AU - Rodríguez, Ósmar

AU - Garcia, Jonathan Pineda

AU - Gutiérrez, Claudia P.

AU - Galbany, Lluís

AU - Barbarino, Cristina

AU - Clark, Peter S.J.

AU - Sollerman, Jesper

AU - Kulkarni, Shrinivas R.

AU - De, Kishalay

AU - Buckley, David A.H.

AU - Rau, Arne

PY - 2019/11/1

Y1 - 2019/11/1

N2 - 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 o. 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.

AB - 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 o. 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.

UR - http://www.scopus.com/inward/record.url?scp=85075308144&partnerID=8YFLogxK

U2 - 10.3847/2041-8213/ab4dae

DO - 10.3847/2041-8213/ab4dae

M3 - مقالة

SN - 2041-8205

VL - 885

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 1

M1 - L23

ER -

SN2018kzr: A Rapidly Declining Transient from the Destruction of a White Dwarf

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