Seeing Double: ASASSN-18bt Exhibits a Two-component Rise in the Early-time K2 Light
文献类型：期刊论文
| 作者 | Shappee, B. J.1; Holoien, T. W. -S.2; Drout, M. R.2; Auchettl, K.3,4,5; Stritzinger, M. D.6,7; Kochanek, C. S.3,8; Stanek, K. Z.3,8; Shaya, E.9; Narayan, G.10; Brown, J. S.8 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2019 |
| 卷号 | 870期号:1页码:14 |
| 关键词 | supernovae: individual (ASASSN-18bt, SN 2018oh) |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aaec79 |
| 通讯作者 | Shappee, B. J.(shappee@hawaii.edu) |
| 英文摘要 | On 2018 February 4.41, the All-Sky Automated Survey for SuperNovae (ASAS-SN) discovered ASASSN-18bt in the K2 Campaign 16 field. With a redshift of z = 0.01098 and a peak apparent magnitude of B-max = 14.31, ASASSN-18bt is the nearest and brightest SNe Ia yet observed by the Kepler spacecraft. Here we present the discovery of ASASSN-18bt, the K2 light curve, and prediscovery data from ASAS-SN and the Asteroid Terrestrial-impact Last Alert System. The K2 early-time light curve has an unprecedented 30-minute cadence and photometric precision for an SN. Ia light curve, and it unambiguously shows a similar to 4 day nearly linear phase followed by a steeper rise. Thus, ASASSN-18bt joins a growing list of SNe Ia whose early light curves are not well described by a single power law. We show that a double-power-law model fits the data reasonably well, hinting that two physical processes must be responsible for the observed rise. However, we find that current models of the interaction with a nondegenerate companion predict an abrupt rise and cannot adequately explain the initial, slower linear phase. Instead, we find that existing published models with shallow Ni-56 are able to span the observed behavior and, with tuning, may be able to reproduce the ASASSN-18bt light curve. Regardless, more theoretical work is needed to satisfactorily model this and other early-time SNe. Ia light curves. Finally, we use Swift X-ray nondetections to constrain the presence of circumstellar material (CSM) at much larger distances and lower densities than possible with the optical light curve. For a constant-density CSM, these nondetections constrain rho < 4.5 x 10(5) cm(-3) at a radius of 4 x 10(15) cm from the progenitor star. Assuming a wind-like environment, we place mass loss limits of <(M)over dot> < 8 x 10(-6) M-circle dot yr(-1). for v(w) =. 100 km s(-1), ruling out some symbiotic progenitor systems. This work highlights the power of well-sampled early-time data and the need for immediate multiband, high-cadence follow-up for progress in understanding SNe Ia. |
| WOS关键词 | WHITE-DWARF MODELS ; I SUPER-NOVAE ; ECCENTRICITY OSCILLATIONS ; EVOLUTION ; COMPANION ; BINARIES ; SPECTRA ; SYSTEMS ; STARS |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000454551600002 |
| 出版者 | IOP PUBLISHING LTD |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/20484]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Shappee, B. J. |
| 作者单位 | 1.Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA 2.Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA 3.Ohio State Univ, Ctr Cosmol & AstroParticle Phys CCAPP, 191 W Woodruff Ave, Columbus, OH 43210 USA 4.Ohio State Univ, Dept Phys, 191 W Woodruff Ave, Columbus, OH 43210 USA 5.Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, Blegdamsvej 17, DK-2100 Copenhagen, Denmark 6.Aarhus Univ, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus, Denmark 7.Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA 8.Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA 9.Univ Maryland, Dept Astron, College Pk, MD 20742 USA 10.Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA |
| 推荐引用方式 GB/T 7714 | Shappee, B. J.,Holoien, T. W. -S.,Drout, M. R.,et al. Seeing Double: ASASSN-18bt Exhibits a Two-component Rise in the Early-time K2 Light[J]. ASTROPHYSICAL JOURNAL,2019,870(1):14. |
| APA | Shappee, B. J..,Holoien, T. W. -S..,Drout, M. R..,Auchettl, K..,Stritzinger, M. D..,...&Strampelli, G. M..(2019).Seeing Double: ASASSN-18bt Exhibits a Two-component Rise in the Early-time K2 Light.ASTROPHYSICAL JOURNAL,870(1),14. |
| MLA | Shappee, B. J.,et al."Seeing Double: ASASSN-18bt Exhibits a Two-component Rise in the Early-time K2 Light".ASTROPHYSICAL JOURNAL 870.1(2019):14. |
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来源：紫金山天文台
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