| DOI | Resolve DOI: https://doi.org/10.1088/2041-8205/778/1/L15 |
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| Author | Search for: Zheng, W.; Search for: Silverman, J.M.; Search for: Filippenko, A.V.; Search for: Kasen, D.; Search for: Nugent, P.E.; Search for: Graham, M.; Search for: Wang, X.; Search for: Valenti, S.; Search for: Ciabattari, F.; Search for: Kelly, P.L.; Search for: Fox, O.D.; Search for: Shivvers, I.; Search for: Clubb, K.I.; Search for: Cenko, S.B.; Search for: Balam, D.1; Search for: Howell, D.A.; Search for: Hsiao, E.; Search for: Li, W.; Search for: Howie Marion, G.; Search for: Sand, D.; Search for: Vinko, J.; Search for: Wheeler, J.C.; Search for: Zhang, J. |
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| Affiliation | - National Research Council of Canada. NRC Herzberg Institute of Astrophysics
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| Format | Text, Article |
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| Abstract | The Type Ia supernova (SN Ia) 2013dy in NGC 7250 (d ≈ 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 ≲ 0.25 R ⊙, 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 MB = -18.72 ± 0.03 mag ∼17.7 days after first light. © 2013. The American Astronomical Society. All rights reserved. |
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| Publication date | 2013 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21269861 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 8048ad61-cb22-4c80-bbcc-637d87e8e20e |
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| Record created | 2013-12-13 |
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| Record modified | 2020-04-22 |
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