Spectroscopic detection of narrow emission lines traces the presence of circumstellar mass distributions around massive stars exploding as core-collapse supernovae. Transient emission lines disappearing shortly after the supernova explosion suggest that the material spatial extent is compact and implies an increased mass loss shortly prior to explosion. Here, we present a systematic survey for such transient emission lines (Flash Spectroscopy) among Type II supernovae detected in the first year of the Zwicky Transient Facility survey. We find that at least six out of ten events for which a spectrum was obtained within two days of the estimated explosion time show evidence for such transient flash lines. Our measured flash event fraction (>30% at 95% confidence level) indicates that elevated mass loss is a common process occurring in massive stars that are about to explode as supernovae.

A Large Fraction of Hydrogen-rich Supernova Progenitors Experience Elevated Mass Loss Shortly Prior to Explosion

Bulla M;
2021

Abstract

Spectroscopic detection of narrow emission lines traces the presence of circumstellar mass distributions around massive stars exploding as core-collapse supernovae. Transient emission lines disappearing shortly after the supernova explosion suggest that the material spatial extent is compact and implies an increased mass loss shortly prior to explosion. Here, we present a systematic survey for such transient emission lines (Flash Spectroscopy) among Type II supernovae detected in the first year of the Zwicky Transient Facility survey. We find that at least six out of ten events for which a spectrum was obtained within two days of the estimated explosion time show evidence for such transient flash lines. Our measured flash event fraction (>30% at 95% confidence level) indicates that elevated mass loss is a common process occurring in massive stars that are about to explode as supernovae.
2021
Bruch Rachel, J.; Gal-Yam, Avishay; Schulze, Steve; Yaron, Ofer; Yang, Yi; Soumagnac, Maayane; Rigault, Mickael; Strotjohann Nora, L.; Ofek, Eran; Sollerman, Jesper; Masci Frank, J.; Barbarino, Cristina; Ho Anna, Y. Q.; Fremling, Christoffer; Perley, Daniel; Nordin, Jakob; Cenko S., Bradley; Adams, S.; Adreoni, Igor; Bellm Eric, C.; Blagorodnova, Nadia; Bulla, M; Burdge, Kevin; De, Kishalay; Dhawan, Suhail; Drake Andrew, J.; Duev Dmitry, A.; Dugas, Alison; Graham, Matthew; Graham Melissa, L.; Irani, Ido; Jencson, Jacob; Karamehmetoglu, Emir; Kasliwal, Mansi; Kim, Young-Lo; Kulkarni, Shrinivas; Kupfer, Thomas; Liang, Jingyi; Mahabal, Ashish; Miller, A. A.; Prince Thomas, A.; Riddle, Reed; Sharma, Y.; Smith, Roger; Taddia, Francesco; Taggart, Kirsty; Walters, Richard; Yan, Lin
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2494961
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