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| 題名: | Late-time spectroscopy of Type Iax Supernovae |
| 作者: | 潘彥丞;Foley, Ryan J.;Jha, Saurabh W.;Pan, Yen-Chen;Zheng, WeiKang;Bildsten, Lars;Filippenko, Alexei V.;Kasen, Daniel |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | Astronomy;Brightness;Continuums;Ejecta;Kinematics;Luminosity;Photosphere;Spectra;Spectral lines;Spectrum analysis;Supernovae;Symbols;Velocity |
| 日期: | 2016-09-01 |
| 上傳時間: | 2026-04-21 14:55:58 (UTC+8) |
| 出版者: | Oxford University Press;London: Oxford University Press |
| 摘要: | 摘要： We examine the late-time (t ≳ 200 d after peak brightness) spectra of Type Iax supernovae (SNe Iax), a low-luminosity, low-energy class of thermonuclear stellar explosions observationally similar to, but distinct from, Type Ia supernovae. We present new spectra of SN 2014dt, resulting in the most complete late-time spectral sequence of an SN Iax. At late times, SNe Iax have generally similar spectra, all with a similar continuum shape and strong forbidden-line emission. However, there is also significant diversity where some SN Iax spectra display narrow P-Cygni features from permitted lines and a continuum indicative of a photosphere at late times in addition to strong narrow (FWHM < 3500 km s−1) forbidden lines, others have no obvious P-Cygni features, strong broad (FWHM > 6000 km s−1) forbidden lines, and weak narrow forbidden lines, and some SNe Iax have spectra intermediate to these two varieties. We find that SNe Iax with strong broad forbidden lines are more luminous and have higher velocity ejecta at peak brightness. We estimate blackbody and kinematic radii of the late-time photosphere, finding the latter significantly larger than the former. We propose a two-component model that solves this discrepancy and explains the diversity of the late-time spectra of SNe Iax. In this model, the broad forbidden lines originate from the SN ejecta, while the photosphere, P-Cygni lines, and narrow forbidden lines originate from a wind launched from the remnant of the progenitor white dwarf and is driven by the radioactive decay of newly synthesized material left in the remnant. The relative strength of the two components accounts for the diversity of late-time SN Iax spectra. This model also solves the puzzle of a long-lived photosphere and the slow late-time decline of SNe Iax.
出版者： London: Oxford University Press
出版日期： 2016-09-01
出處： Monthly notices of the Royal Astronomical Society, 2016-09, Vol.461 (1), p.433-457
資源來源： Alma/SFX Local Collection
版權： 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society 2016
版權： Copyright Oxford University Press, UK Sep 1, 2016
識別號： ISSN: 0035-8711
識別號： ISSN: 1365-8711
識別號： ISSN: 1365-2966
識別號： EISSN: 1365-2966
識別號： DOI: 10.1093/mnras/stw1320 |
| 顯示於類別: | [天文研究所] 期刊論文
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