Signatures of circumstellar interaction in the Type IIL supernova ASASSN-15oz

Azalee Bostroem K.; Valenti S.; Horesh A.; Morozova V.; Kuin N.P.M.; Wyatt S.; Jerkstrand A.; Sand, D. J.; Lundquist M.; Smith M.; Sullivan M.; Hosseinzadeh G.; Arcavi I.; Callis E.; Cartier R.; et. al.

Abstract

Hydrogen-rich, core-collapse supernovae are typically divided into four classes: IIP, IIL, IIn, and IIb. Recent hydrodynamic modelling shows that circumstellar material is required to produce the early light curves of most IIP/IIL supernovae. In this scenario, IIL supernovae experience large amounts of mass-loss before exploding. We test this hypothesis on ASASSN-15oz, a Type IIL supernova. With extensive follow-up in the X-ray, UV, optical, IR, and radio, we present our search for signs of interaction and the mass-loss history indicated by their detection. We find evidence of short-lived intense mass-loss just prior to explosion from light-curve modelling, amounting in 1.5 M-circle dot of material within 1800 R-circle dot of the progenitor. We also detect the supernova in the radio, indicating mass-loss rates of 10(-6) to 10(-7) M-circle dot yr(-1) prior to the extreme mass-loss period. Our failure to detect the supernova in the X-ray and the lack of narrow emission lines in the UV, optical, and NIR do not contradict this picture and place an upper limit on the mass-loss rate outside the extreme period of <10(-4) M-circle dot yr(-1). This paper highlights the importance gathering comprehensive data on more Type II supernovae to enable detailed modelling of the progenitor and supernova which can elucidate their mass-loss histories and envelope structures and thus inform stellar evolution models.

Más información

Título según WOS: Signatures of circumstellar interaction in the Type IIL supernova ASASSN-15oz
Título según SCOPUS: Signatures of circumstellar interaction in the Type IIL supernova ASASSN-15oz
Título de la Revista: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volumen: 485
Número: 4
Editorial: Oxford Academic
Fecha de publicación: 2019
Página de inicio: 5120
Página final: 5141
Idioma: English
DOI:

10.1093/mnras/stz570

Notas: ISI, SCOPUS