期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 778, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/778/1/L15
关键词
supernovae: general; supernovae: individual (SN 2013dy)
资金
- TABASGO Foundation
- Sylvia and Jim Katzman Foundation
- Christopher R. Redlich Fund
- NSF [AST-1211916, AST-1302771, AST-1109801]
- NNSFC [11073013, 11178003]
- Foundation of Tsinghua University [2011Z02170]
- Major State Basic Research Development Program [2013CB834903]
- Hungarian OTKA [NN 107637]
- DoE [DE-AC02-05CH11231]
- W. M. Keck Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1302771, 1211916] Funding Source: National Science Foundation
The Type Ia supernova (SN Ia) 2013dy in NGC 7250 (d approximate to 13.7 Mpc) was discovered by the Lick Observatory Supernova Search. Combined with a prediscovery detection by the Italian Supernova Search Project, we are able to constrain the first-light time of SN 2013dy to be only 0.10 +/- 0.05 days (2.4 +/- 1.2 hr) before the first detection. This makes SN 2013dy the earliest known detection of an SN Ia. We infer an upper limit on the radius of the progenitor star of R-0 less than or similar to 0.25 R-circle dot, consistent with that of a white dwarf. The light curve exhibits a broken power law with exponents of 0.88 and then 1.80. A spectrum taken 1.63 days after first light reveals a C II absorption line comparable in strength to Si II. This is the strongest C II feature ever detected in a normal SN Ia, suggesting that the progenitor star had significant unburned material. The C II line in SN 2013dy weakens rapidly and is undetected in a spectrum 7 days later, indicating that C II is detectable for only a very short time in some SNe Ia. SN 2013dy reached a B-band maximum of M-B = -18.72 +/- 0.03 mag similar to 17.7 days after first light.
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