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A statistical analysis of circumstellar material in Type Ia supernovae

Maguire, K and Sullivan, M and Patat, F and Gal-Yam, A and Hook, IM and Dhawan, S and Howell, DA and Mazzali, PA and Nugent, PE and Pan, Y-C and Podsiadlowski, P and Simon, JD and Sternberg, A and Valenti, S and Baltay, C and Bersier, D and Blagorodnova, N and Chen, T-W and Ellman, N and Feindt, U and Foerster, F and Fraser, M and Gonzalez-Gaitan, S and Graham, ML and Gutierrez, C and Hachinger, S and Hadjiyska, E and Inserra, C and Knapic, C and Laher, RR and Leloudas, G and Margheim, S and McKinnon, R and Molinaro, M and Morrell, N and Ofek, EO and Rabinowitz, D and Rest, A and Sand, D and Smareglia, R and Smartt, SJ and Taddia, F and Walker, ES and Walton, NA and Young, DR (2013) A statistical analysis of circumstellar material in Type Ia supernovae. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 436 (1). pp. 222-240. ISSN 0035-8711

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Abstract

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 (CSM) 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 ESO 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 non blueshifted 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 there are at least two distinct populations of normal, cosmologically useful SNe Ia.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the royal Astronomical Society following peer review. The version of record "A statistical analysis of circumstellar material in Type Ia supernovae" is available online at: http://dx.doi.org/10.1093/mnras/stt1586
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: OXFORD UNIV PRESS
Related URLs:
Date Deposited: 08 Feb 2016 12:41
Last Modified: 08 Feb 2016 12:41
DOI or Identification number: 10.1093/mnras/stt1586
URI: http://researchonline.ljmu.ac.uk/id/eprint/2866

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