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| 題名: | SUPERLUMINOUS SUPERNOVA SN 2015bn in the NEBULAR PHASE: EVIDENCE for the ENGINE-POWERED EXPLOSION of A STRIPPED MASSIVE STAR |
| 作者: | 陳婷琬;Nicholl, M.;Berger, E.;Margutti, R.;Chornock, R.;Blanchard, P. K.;Jerkstrand, A.;Smartt, S. J.;Arcavi, I.;Challis, P.;Chambers, K. C.;Chen, T.-W.;Cowperthwaite, P. S.;Gal-Yam, A.;Hosseinzadeh, G.;Howell, D. A.;Inserra, C.;Kankare, E.;Magnier, E. A.;Maguire, K.;Mazzali, P. A.;McCully, C.;Milisavljevic, D.;Smith, K. W.;Taubenberger, S.;Valenti, S.;Wainscoat, R. J.;Yaron, O.;Young, D. R. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | ABSORPTION;ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;CALCIUM;COSMIC GAMMA BURSTS;EMISSION;EXPLOSIONS;GAMMA RADIATION;HYDROGEN;Imaging;INTERACTIONS;Light curve;LUMINOSITY;MAGNESIUM;MASS;Massive stars;NICKEL 56;OPACITY;OXYGEN;Photosphere;RED SHIFT;Signatures;SPECTRA;SPECTROSCOPY;SUPERNOVAE;supernovae: general;supernovae: individual (2015bn);VISIBLE RADIATION |
| 日期: | 2016-09-10 |
| 上傳時間: | 2026-04-21 14:57:03 (UTC+8) |
| 出版者: | IOP Publishing Ltd.;United States: The American Astronomical Society |
| 摘要: | 摘要： ABSTRACT We present nebular-phase imaging and spectroscopy for the hydrogen-poor superluminous supernova (SLSN) SN 2015bn, at redshift z = 0.1136, spanning +250-400 days after maximum light. The light curve exhibits a steepening in the decline rate from 1.4 mag (100 days)−1 to 1.7 mag (100 days)−1, suggestive of a significant decrease in the opacity. This change is accompanied by a transition from a blue continuum superposed with photospheric absorption lines to a nebular spectrum dominated by emission lines of oxygen, calcium, and magnesium. There are no obvious signatures of circumstellar interaction or large 56Ni mass. We show that the spectrum at +400 days is virtually identical to a number of energetic SNe Ic such as SN 1997dq, SN 2012au, and SN 1998bw, indicating similar core conditions and strengthening the link between "hypernovae"/long gamma-ray bursts and SLSNe. A single explosion mechanism may unify these events that span absolute magnitudes of −22 < MB < −17. Both the light curve and spectrum of SN 2015bn are consistent with an engine-driven explosion ejecting 7-30 M of oxygen-dominated ejecta (for reasonable choices in temperature and opacity). A strong and relatively narrow O i λ7774 line, seen in a number of these energetic events but not in normal supernovae, may point to an inner shell that is the signature of a central engine.
其他題名： APJL
其他題名： Astrophys. J. Lett
出版者： United States: The American Astronomical Society
出版日期： 2016-09-10
出處： Astrophysical journal. Letters, 2016-09, Vol.828 (2), p.L18--L18
資源來源： Institute of Physics Journals
版權： 2016. The American Astronomical Society. All rights reserved.
識別號： ISSN: 2041-8205
識別號： ISSN: 2041-8213
識別號： EISSN: 2041-8213
識別號： DOI: 10.3847/2041-8205/828/2/L18 |
| 顯示於類別: | [天文研究所] 期刊論文
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