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| 題名: | A statistical analysis of circumstellar material in type Ia supernovae |
| 作者: | 潘彥丞;Maguire, K.;Sullivan, M.;Patat, F.;Gal-Yam, A.;Hook, I. M.;Dhawan, S.;Howell, D. A.;Mazzali, P.;Nugent, P. E.;Pan, Y.-C.;Podsiadlowski, P.;Simon, J. D.;Sternberg, A.;Valenti, S.;Baltay, C.;Bersier, D.;Blagorodnova, N.;Chen, T.-W.;Ellman, N.;Feindt, U.;Förster, F.;Fraser, M.;González-Gaitán, S.;Graham, M. L.;Gutiérrez, C.;Hachinger, S.;Hadjiyska, E.;Inserra, C.;Knapic, C.;Laher, R. R.;Leloudas, G.;Margheim, S.;McKinnon, R.;Molinaro, M.;Morrell, N.;Ofek, E. O.;Rabinowitz, D.;Rest, A.;Sand, D.;Smareglia, R.;Smartt, S. J.;Taddia, F.;Walker, E. S.;Walton, N. A.;Young, D. R. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | Astronomy;circumstellar matter;Cosmology;distance scale;Red shift;Space telescopes;Supernovae;supernovae: general |
| 日期: | 2013-11-01 |
| 上傳時間: | 2026-04-21 14:22:16 (UTC+8) |
| 出版者: | Oxford University Press;London: Oxford University Press (OUP) |
| 摘要: | 摘要： A key tracer of the elusive progenitor systems of Type Ia supernovae (SNe Ia) is the detection of narrow blueshifted time-varying Na i D absorption lines, interpreted as evidence of circumstellar material surrounding the progenitor system. The origin of this material is controversial, but the simplest explanation is that it results from previous mass-loss in a system containing a white dwarf and a non-degenerate companion star. We present new single-epoch intermediate-resolution spectra of 17 low-redshift SNe Ia taken with XShooter on the European Southern Observatory Very Large Telescope. Combining this sample with events from the literature, we confirm an excess (∼20 per cent) of SNe Ia displaying blueshifted narrow Na i D absorption features compared to redshifted Na i D features. The host galaxies of SNe Ia displaying blueshifted absorption profiles are skewed towards later-type galaxies, compared to SNe Ia that show no Na i D absorption and SNe Ia displaying blueshifted narrow Na i D absorption features have broader light curves. The strength of the Na i D absorption is stronger in SNe Ia displaying blueshifted Na i D absorption features than those without blueshifted features, and the strength of the blueshifted Na i D is correlated with the B − V colour of the SN at maximum light. This strongly suggests the absorbing material is local to the SN. In the context of the progenitor systems of SNe Ia, we discuss the significance of these findings and other recent observational evidence on the nature of SN Ia progenitors. We present a summary that suggests that there are at least two distinct populations of normal, cosmologically useful SNe Ia.
其他題名： Mon. Not. R. Astron. Soc
出版者： London: Oxford University Press (OUP)
出版日期： 2013-11-21
出處： Monthly Notices of the Royal Astronomical Society, 2013-11, Vol.436 (1), p.222-240
資源來源： Alma/SFX Local Collection
版權： 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society 2013
版權： Copyright Oxford University Press, UK Nov 21, 2013
識別號： ISSN: 0035-8711
識別號： ISSN: 1365-2966
識別號： ISSN: 1365-8711
識別號： EISSN: 1365-2966
識別號： DOI: 10.1093/mnras/stt1586 |
| 顯示於類別: | [天文研究所] 期刊論文
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