期刊
ASTROPHYSICAL JOURNAL
卷 894, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab7ccc
关键词
Supernovae
资金
- Japanese Cabinet Office
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Japan Society for the Promotion of Science (JSPS)
- Japan Science and Technology Agency (JST)
- Toray Science Foundation
- NAOJ
- Kavli IPMU
- KEK
- ASIAA
- Princeton University
- National Aeronautics and Space Administration [NNX08AR22G]
- National Science Foundation [AST-1238877]
- JSPS [18H04585, 16H02183, 19H00694, 18H0455, 18H05223, 17H02864]
- MEXT [17H06363]
Rapidly evolving transients form a new class of transients that show shorter timescales of light curves than those of typical core-collapse and thermonuclear supernovae. We performed a systematic search for rapidly evolving transients using deep data taken with the Hyper Suprime-Cam Subaru Strategic Program Transient Survey. By measuring the timescales of the light curves of 1824 transients, we identified five rapidly evolving transients. Our samples are found in a wide range of redshifts (0.3 <= z <= 1.5) and peak absolute magnitudes (-17 >= M-i >= -20). The light-curve properties are similar to those of the previously discovered rapidly evolving transients. They show a relatively blue spectral energy distribution, with the best-fit blackbody of 8000-18,000 K. We show that some of the transients require power sources other than the radioactive decays of Ni-56 because of their high peak luminosities and short timescales. The host galaxies of all of the samples are star-forming galaxies, suggesting a massive star origin for the rapidly evolving transients. The event rate is roughly estimated to be similar to 4000 events yr(-1) Gpc(-3), which is about 1% of core-collapse supernovae.
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