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| 題名: | LSQ13fn: A type II-Plateau supernova with a possibly low metallicity progenitor that breaks the standardised candle relation∗ |
| 作者: | 陳婷琬;Polshaw, J.;Kotak, R.;Dessart, L.;Fraser, M.;Gal-Yam, A.;Inserra, C.;Sim, S. A.;Smartt, S. J.;Sollerman, J.;Baltay, C.;Rabinowitz, D.;Benetti, S.;Botticella, M. T.;Campbell, H.;Chen, T.-W.;Galbany, L.;McKinnon, R.;Nicholl, M.;Smith, K. W.;Sullivan, M.;Takáts, K.;Valenti, S.;Young, D. R. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | Astrophysics;Breaking;Candles;Imaging;Massive stars;Metallicity;Physics;Progenitors (astrophysics);Spectral emission;supernovae: general;supernovae: individual: LSQ13fn;Supernovas |
| 日期: | 2016-04-01 |
| 上傳時間: | 2026-04-21 14:50:42 (UTC+8) |
| 出版者: | EDP Sciences |
| 摘要: | 摘要： We present optical imaging and spectroscopy of supernova (SN) LSQ13fn, a type II supernova with several hitherto-unseen properties. Although it initially showed strong symmetric spectral emission features attributable to He ii, N iii, and C iii, reminiscent of some interacting SNe, it transitioned into an object that would fall more naturally under a type II-Plateau (IIP) classification. However, its spectral evolution revealed several unusual properties: metal lines appeared later than expected, were weak, and some species were conspicuous by their absence. Furthermore, the line velocities were found to be lower than expected given the plateau brightness, breaking the SN IIP standardised candle method for distance estimates. We found that, in combination with a short phase of early-time ejecta-circumstellar material interaction, metal-poor ejecta, and a large progenitor radius could reasonably account for the observed behaviour. Comparisons with synthetic model spectra of SNe IIP of a given progenitor mass would imply a progenitor star metallicity as low as 0.1 Z⊙. LSQ13fn highlights the diversity of SNe II and the many competing physical effects that come into play towards the final stages of massive star evolution immediately preceding core-collapse.
出版者： EDP Sciences
出版日期： 2016-04-01
出處： Astronomy and astrophysics (Berlin), 2016-04, Vol.588, p.A1
資源來源： EDP Sciences
版權： licence_http://creativecommons.org/publicdomain/zero
識別號： ISSN: 0004-6361
識別號： ISSN: 1432-0746
識別號： EISSN: 1432-0746
識別號： DOI: 10.1051/0004-6361/201527682 |
| 顯示於類別: | [天文研究所] 期刊論文
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