A statistical analysis of circumstellar material in type Ia supernovae

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101052

Title:	A statistical analysis of circumstellar material in type Ia supernovae
Authors:	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.
Contributors:	理學院天文研究所
Keywords:	Astronomy;circumstellar matter;Cosmology;distance scale;Red shift;Space telescopes;Supernovae;supernovae: general
Date:	2013-11-01
Issue Date:	2026-04-21 14:22:16 (UTC+8)
Publisher:	Oxford University Press;London: Oxford University Press (OUP)
Abstract:	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
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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