K2 Observations of SN 2018oh Reveal a Two-component Rising Light Curve for a Type Ia Supernova
文献类型：期刊论文
| 作者 | Dimitriadis, G.1; Foley, R. J.1; Rest, A.2,3; Kasen, D.4,5; Piro, A. L.6; Polin, A.4,7; Jones, D. O.1; Villar, A.8; Narayan, G.3; Coulter, D. A.1 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2019 |
| 卷号 | 870期号:1页码:16 |
| ISSN号 | 2041-8205 |
| 关键词 | supernovae: general supernovae: individual (SN 2018oh) |
| DOI | 10.3847/2041-8213/aaedb0 |
| 通讯作者 | Dimitriadis, G.() |
| 英文摘要 | We present an exquisite 30 minute cadence Kepler (K2) light curve of the Type Ia supernova (SN Ia) 2018oh (ASASSN-18bt), starting weeks before explosion, covering the moment of explosion and the subsequent rise, and continuing past peak brightness. These data are supplemented by multi-color Panoramic Survey Telescope (Pan-STARRS1) and Rapid Response System 1 and Cerro Tololo Inter-American Observatory 4 m Dark Energy Camera (CTIO 4-m DECam) observations obtained within hours of explosion. The K2 light curve has an unusual two-component shape, where the flux rises with a steep linear gradient for the first few days, followed by a quadratic rise as seen for typical supernovae (SNe). Ia. This "flux excess" relative to canonical SN. Ia behavior is confirmed in our i-band light curve, and furthermore, SN 2018oh is especially blue during the early epochs. The flux excess peaks 2.14 +/- 0.04 days after explosion, has a FWHM of 3.12 +/- 0.04 days, a blackbody temperature of T=17,500(-9,000)(+11,500) K, a peak luminosity of 4.3 +/- 0.2 x 10(37) erg s(-1), and a total integrated energy of 1.27 +/- 0.01 x 10(43) erg. We compare SN 2018oh to several models that may provide additional heating at early times, including collision with a companion and a shallow concentration of radioactive nickel. While all of these models generally reproduce the early K2 light curve shape, we slightly favor a companion interaction, at a distance of similar to 2x10(12) cm based on our early color measurements, although the exact distance depends on the uncertain viewing angle. Additional confirmation of a companion interaction in future modeling and observations of SN 2018oh would provide strong support for a single-degenerate progenitor system. |
| WOS关键词 | CIRCUMSTELLAR MATERIAL ; RISE-TIME ; COMPANION ; EXPLOSION ; PROGENITORS ; BINARIES ; LAMBDA ; GALAXY ; GIANT ; OMEGA |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000454558000001 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/20490]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Dimitriadis, G. |
| 作者单位 | 1.Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA 2.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA 3.Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA 4.Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA 5.Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA 6.Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA 7.Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA 8.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA 9.State Univ New Jersey, Dept Phys & Astron, Rutgers, 136 Frelinghuysen Rd, Piscataway, NJ 08854 USA 10.Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA |
| 推荐引用方式 GB/T 7714 | Dimitriadis, G.,Foley, R. J.,Rest, A.,et al. K2 Observations of SN 2018oh Reveal a Two-component Rising Light Curve for a Type Ia Supernova[J]. ASTROPHYSICAL JOURNAL LETTERS,2019,870(1):16. |
| APA | Dimitriadis, G..,Foley, R. J..,Rest, A..,Kasen, D..,Piro, A. L..,...&Bilinski, C..(2019).K2 Observations of SN 2018oh Reveal a Two-component Rising Light Curve for a Type Ia Supernova.ASTROPHYSICAL JOURNAL LETTERS,870(1),16. |
| MLA | Dimitriadis, G.,et al."K2 Observations of SN 2018oh Reveal a Two-component Rising Light Curve for a Type Ia Supernova".ASTROPHYSICAL JOURNAL LETTERS 870.1(2019):16. |
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来源：紫金山天文台
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