Rapidly Rising Transients from the Subaru Hyper Suprime-Cam Transient Survey
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2016Metadata
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Tanaka, Masaomi
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Rapidly Rising Transients from the Subaru Hyper Suprime-Cam Transient Survey
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Abstract
We present rapidly rising transients discovered by a high-cadence transient survey with the Subaru telescope and
Hyper Suprime-Cam. We discovered five transients at z=0.384–0.821, showing a rate of rise faster than 1 mag
per day in the restframe near-ultraviolet wavelengths. The fast rate of rise and brightness are most similar to SN
2010aq and PS1-13arp, for which ultraviolet emission was detected within a few days after the shock breakout.
The lower limit of the event rate of rapidly rising transients is ∼9% of core-collapse supernova rates, assuming the
duration of rapid rise to be 1 day. We show that the light curves of the three faint objects agree with the cooling
envelope emission from the explosion of red supergiants. The other two luminous objects, however, are brighter
and faster than the cooling envelope emission. We interpret these two objects to be the shock breakout from a
dense wind with a mass loss rate of ∼10−3 M yr−1, as also proposed for PS1-13arp. This mass loss rate is higher
than that typically observed for red supergiants. The event rate of these luminous objects is 1% of the corecollapse
supernova rate, and thus our study implies that more than ∼1% of massive stars can experience intense
mass loss a few years before the explosion.
General note
Artículo de publicación ISI
Patrocinador
Toyota foundation
D11-R-0830
RFBR-JSPS
Russian Science Foundation
14-12-00203
JSPS
26.51
Ministry of Economy, Development
Tourism's Millennium Science Initiative
IC120009
CONICYT through FONDECYT
3140563
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URI: https://repositorio.uchile.cl/handle/2250/139332
DOI: DOI: 10.3847/0004-637X/819/1/5
ISSN: 0004-637X
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The Astrophysical Journal, 819:5 (15 pp), 2016 March 1
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