Type Ia supernova spectral features in the context of their host galaxy properties

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101352

Title:	Type Ia supernova spectral features in the context of their host galaxy properties
Authors:	潘彥丞;Pan, Y.-C.;Sullivan, M.;Maguire, K.;Gal-Yam, A.;Hook, I. M.;Howell, D. A.;Nugent, P. E.;Mazzali, P. A.
Contributors:	理學院天文研究所
Keywords:	Astronomical models;Explosions;Silicon;Spectra;Star & galaxy formation;Stellar mass;Strength;Supernovae;Symbols;Trends;Velocity
Date:	2015-01-01
Issue Date:	2026-04-21 14:31:17 (UTC+8)
Publisher:	Oxford University Press;London: Oxford University Press
Abstract:	摘要： We analyse spectroscopic measurements of 122 Type Ia supernovae (SNe Ia) with z < 0.09 discovered by the Palomar Transient Factory, focusing on the properties of the Si ii λ6355 and Ca ii ‘near-infrared triplet’ absorptions. We examine the velocities of the photospheric Si ii λ6355, and the velocities and strengths of the photospheric and high-velocity Ca ii, in the context of the stellar mass (M stellar) and star formation rate (SFR) of the SN host galaxies, as well as the position of the SN within its host. We find that SNe Ia with faster Si ii λ6355 tend to explode in more massive galaxies, with the highest velocity events only occurring in galaxies with M stellar > 3 × 109 M⊙. We also find some evidence that these highest velocity SNe Ia explode in the inner regions of their host galaxies, similar to the study of Wang et al., although the trend is not as significant in our data. We show that these trends are consistent with some SN Ia spectral models, if the host galaxy stellar mass is interpreted as a proxy for host galaxy metallicity. We study the strength of the high-velocity component of the Ca ii near-IR absorption, and show that SNe Ia with stronger high-velocity components relative to photospheric components are hosted by galaxies with low M stellar, blue colour, and a high sSFR. Such SNe are therefore likely to arise from the youngest progenitor systems. This argues against a pure orientation effect being responsible for high-velocity features in SN Ia spectra and, when combined with other studies, is consistent with a scenario where high-velocity features are related to an interaction between the SN ejecta and circumstellar medium local to the SN. 其他題名： Mon. Not. R. Astron. Soc 出版者： London: Oxford University Press 出版日期： 2015-01-01 出處： Monthly notices of the Royal Astronomical Society, 2015-01, Vol.446 (1), p.354-368 資源來源： Alma/SFX Local Collection 版權： 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society 2014 版權： Copyright Oxford University Press, UK Jan 2015 識別號： ISSN: 0035-8711 識別號： ISSN: 1365-8711 識別號： ISSN: 1365-2966 識別號： EISSN: 1365-2966 識別號： DOI: 10.1093/mnras/stu2121
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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