A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
The delay of shock breakout due to circumstellar material evident in most type II supernovae
Tekijät: Forster F, Moriya TJ, Maureira JC, Anderson JP, Blinnikov S, Bufano F, Cabrera-Vives G, Clocchiatti A, de Jaeger T, Estevez PA, Galbany L, Gonzalez-Gaitan S, Grafener G, Hamuy M, Hsiao EY, Huentelemu P, Huijse P, Kuncarayakti H, Martinez J, Medina G, Olivares F, Pignata G, Razza A, Reyes I, San Martin J, Smith RC, Vera E, Vivas AK, Postigo AD, Yoon SC, Ashall C, Fraser M, Gal-Yam A, Kankare E, Le Guillou L, Mazzali PA, Walton NA, Young DR, Young DR
Kustantaja: NATURE PUBLISHING GROUP
Julkaisuvuosi: 2018
Journal: Nature Astronomy
Tietokannassa oleva lehden nimi: NATURE ASTRONOMY
Lehden akronyymi: NAT ASTRON
Vuosikerta: 2
Numero: 10
Aloitussivu: 808
Lopetussivu: 818
Sivujen määrä: 11
ISSN: 2397-3366
eISSN: 2397-3366
DOI: https://doi.org/10.1038/s41550-018-0563-4
Rinnakkaistallenteen osoite: https://arxiv.org/abs/1809.06379
Type II supernovae (SNe II) originate from the explosion of hydrogen-rich supergiant massive stars. Their first electromagnetic signature is the shock breakout (SBO), a short-lived phenomenon that can last for hours to days depending on the density at shock emergence. We present 26 rising optical light curves of SN II candidates discovered shortly after explosion by the High Cadence Transient Survey and derive physical parameters based on hydrodynamical models using a Bayesian approach. We observe a steep rise of a few days in 24 out of 26 SN II candidates, indicating the systematic detection of SBOs in a dense circumstellar matter consistent with a mass loss rate of (M)over dot >10(-4)M(circle dot)yr(-1)or a dense atmosphere. This implies that the characteristic hour-timescale signature of stellar envelope SBOs may be rare in nature and could be delayed into longer-lived circumstellar material SBOs in most SNe II.
