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Tytuł:
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A Large Fraction of Hydrogen-rich Supernova Progenitors Experience Elevated Mass Loss Shortly Prior to Explosion.
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Autorzy:
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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.
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Temat:
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TYPE II supernovae
SUPERGIANT stars
MASS loss (Astrophysics)
EXPLOSIONS
SUPERNOVAE
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Źródło:
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Astrophysical Journal; 5/1/2021, Vol. 912 Issue 1, p1-20, 20p
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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. [ABSTRACT FROM AUTHOR]
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