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| 題名: | PS1-12sk is a peculiar supernova from a he-rich progenitor system in a brightest cluster galaxy environment |
| 作者: | 浦田裕次;Sanders, N. E.;Soderberg, A. M.;Foley, R. J.;Chornock, R.;Milisavljevic, D.;Margutti, R.;Drout, M. R.;Moe, M.;Berger, E.;Brown, W. R.;Lunnan, R.;Smartt, S. J.;Fraser, M.;Kotak, R.;Magill, L.;Smith, K. W.;Wright, D.;Huang, K.;Urata, Y.;Mulchaey, J. S.;Rest, A.;Sand, D. J.;Chomiuk, L.;Friedman, A. S.;Kirshner, R. P.;Marion, G. H.;Tonry, J. L.;Burgett, W. S.;Chambers, K. C.;Hodapp, K. W.;Kudritzki, R. P.;Price, P. A. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;Channels;EMISSION;ENERGY SPECTRA;ENVIRONMENT;Explosions;Explosive forming;Galactic clusters;GALAXIES;GALAXY CLUSTERS;MASS;MONITORING;PROBABILITY;Progenitors (astrophysics);PULSE RISE TIME;Spectral energy distribution;Star formation;SUPERNOVAE;Supernovas;WAVELENGTHS;WHITE DWARF STARS |
| 日期: | 2013-05-20 |
| 上傳時間: | 2026-04-21 14:20:24 (UTC+8) |
| 出版者: | IOP Publishing Ltd.;United States |
| 摘要: | 摘要： We report on our discovery and observations of the Pan-STARRS1 supernova (SN) PS1-12sk, a transient with properties that indicate atypical star formation in its host galaxy cluster or pose a challenge to popular progenitor system models for this class of explosion. The optical spectra of PS1-12sk classify it as a Type Ibn SN (SN Ibn; cf. SN 2006jc), dominated by intermediate-width (3 x 10 super(3) km s super(-1)) and time variable He I emission. Our multi-wavelength monitoring establishes the rise time dt ~ 9-23 days and shows an NUV-NIR spectral energy distribution with temperature [> ~]17 x 10 super(3) K and a peak magnitude of M sub(z) = -18.88 + or - 0.02 mag. SN Ibn spectroscopic properties are commonly interpreted as the signature of a massive star (17-100 M sub([middot in circle])) explosion within an He-enriched circumstellar medium. However, unlike previous SNe Ibn, PS1-12sk is associated with an elliptical brightest cluster galaxy, CGCG 208-042 (z = 0.054) in cluster RXC J0844.9+4258. The expected probability of an event like PS1-12sk in such environments is low given the measured infrequency of core-collapse SNe in red-sequence galaxies compounded by the low volumetric rate of SN Ibn. Furthermore, we find no evidence of star formation at the explosion site to sensitive limits ([Sigma] sub(H[alpha]) [<, ~] 2 x 10 super(-3) M sub([middot in circle]) yr super(-1) kpc super(-2)). We therefore discuss white dwarf binary systems as a possible progenitor channel for SNe Ibn. We conclude that PSl-12sk represents either a fortuitous and statistically unlikely discovery, evidence for a top-heavy initial mass function in galaxy cluster cooling flow filaments, or the first clue suggesting an alternate progenitor channel for SNe Ibn.
出版者： United States
出版日期： 2013-05-20
出處： The Astrophysical journal, 2013-05, Vol.769 (1), p.39-15
資源來源： IoP Science journals
識別號： ISSN: 0004-637X
識別號： ISSN: 1538-4357
識別號： EISSN: 1538-4357
識別號： DOI: 10.1088/0004-637X/769/1/39 |
| 顯示於類別: | [天文研究所] 期刊論文
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