Статья

THE VERY YOUNG TYPE Ia SUPERNOVA 2013dy: DISCOVERY, AND STRONG CARBON ABSORPTION IN EARLY-TIME SPECTRA

WeiKang ZhengDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]J. M. SilvermanDepartment of Astronomy, University of Texas, Austin, TX 78712, USAA. V. FilippenkoDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]Daniel KasenDepartment of Physics, University of California, Berkeley, CA 94720, USAP. NugentDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]M. L. GrahamDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]Xiaofeng WangDepartment of Physics, Tsinghua University, Beijing 100084, ChinaStefano ValentiDepartment of Physics, Broida Hall, University of California, Santa Barbara, CA 93106, USAF. CiabattariMonte Agliale Observatory, Borgo a Mozzano, Lucca, I-55023 ItalyPatrick L. KellyDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]Ori D. FoxDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]I. ShivversDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]K. I. ClubbDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]S. B. CenkoAstrophysics Science Division, NASA Goddard Space Flight Center, Mail Code 661, Greenbelt, MD 20771, USAD. BalamDominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council of Canada, 5071 West Saanich Road, Victoria, BC V9E 2E7, CanadaD. A. HowellDepartment of Physics, Broida Hall, University of California, Santa Barbara, CA 93106, USAE. Y. HsiaoCarnegie Observatories, Las Campanas Observatory, Colina El Pino, Casilla 601, ChileWeidong LiDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USA; [email protected]G. H. MarionDepartment of Astronomy, University of Texas, Austin, TX 78712, USADavid SandPhysics Department, Texas Tech University, Lubbock, TX 79409, USAJozsef VinkoDepartment of Astronomy, University of Texas, Austin, TX 78712, USAJ. Craig WheelerDepartment of Astronomy, University of Texas, Austin, TX 78712, USAJujia ZhangKey Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China

2013en

ABI

Аннотация

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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Идентификаторы

DOI: 10.1088/2041-8205/778/1/l15

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Цитирований: 2Использованных источников: 0

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