Nebular-phase spectra of nearby Type Ia Supernovae

被引：57

作者：

Graham, M. L. ^{[1
,2
]}

Kumar, S. ^{[2
]}

Hosseinzadeh, G. ^{[3
,4
]}

Hiramatsu, D. ^{[3
,4
]}

Arcavi, I. ^{[3
,4
]}

Howell, D. A. ^{[3
,4
]}

Valenti, S. ^{[5
]}

Sand, D. J. ^{[6
,7
]}

Parrent, J. T. ^{[8
]}

McCully, C. ^{[3
,4
]}

Filippenko, A. V. ^{[2
,9
]}

机构：

[1] Univ Washington, Dept Astron, Box 351580, Seattle, WA 98195 USA

[2] Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA

[3] Las Cumbres Observ, Goleta, CA 93117 USA

[4] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[5] Univ Calif Davis, Dept Phys, 1 Shields Ave, Davis, CA 95616 USA

[6] Univ Arizona, Dept Astron, 933 N Cherry Ave, Tucson, AZ 85719 USA

[7] Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85719 USA

[8] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[9] Univ Calif Berkeley, Miller Inst Basic Res Sci, Berkeley, CA 94720 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 472卷 / 03期

基金：

美国国家科学基金会;

关键词：

supernovae: general; supernovae: individual: SN2012fr; SN2012hr; SN2013aa; SN2013cs; ASASSN-14jg; SN2015F; SN2013dy; SN2013gy; TULLY-FISHER RELATION; LATE-TIME SPECTRA; EXPLOSION ASYMMETRY; SN; 2011FE; PROGENITOR; GALAXIES; HYDROGEN; SEARCH; 1991BG; SPECTROPOLARIMETRY;

D O I：

10.1093/mnras/stx2224

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present late-time spectra of eight Type Ia supernovae (SNe Ia) obtained at > 200 d after peak brightness using the Gemini South and Keck telescopes. All of the SNe Ia in our sample were nearby, well separated from their host galaxy's light, and have early-time photometry and spectroscopy from the Las Cumbres Observatory. Parameters are derived from the light curves and spectra such as peak brightness, decline rate, photospheric velocity and the widths and velocities of the forbidden nebular emission lines. We discuss the physical interpretations of these parameters for the individual SNe Ia and the sample in general, including comparisons to well-observed SNe Ia from the literature. There are possible correlations between early-time and late-time spectral features that may indicate an asymmetric explosion, so we discuss our sample of SNe within the context ofmodels for an offset ignition and/or white dwarf collisions. A subset of our late-time spectra are uncontaminated by host emission, and we statistically evaluate our non-detections of Ha emission to limit the amount of hydrogen in these systems. Finally, we consider the late-time evolution of the iron emission lines, finding that not all of our SNe follow the established trend of a redward migration at > 200 d after maximum brightness.

引用

页码：3437 / 3454

页数：18

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