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Spectral properties...
Spectral properties of Type Ia supernovae up to z~0.3
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- Nordin, Jakob (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC),CoPS
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- Östman, Linda (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Goobar, Ariel (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Amanullah, Rahman (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Nichol, R. C. (author)
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Smith, M. (author)
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- Sollerman, Jesper (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Basset, B. A. (author)
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Frieman, J. A. (author)
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Garnavich, P. M. (author)
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Leloudas, G. (author)
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Sako, M. (author)
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Schneider, D. P. (author)
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(creator_code:org_t)
- 2011-01-10
- 2011
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 526, s. A119-
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Abstract
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- Aims: Spectroscopic observations of type Ia supernovae obtained at the New Technology Telescope (NTT) and the Nordic Optical Telescope (NOT), in conjunction with the SDSS-II Supernova Survey, are analysed. We use spectral indicators measured up to a month after the lightcurve peak luminosity to characterise the supernova properties, and examine these for potential correlations with host galaxy type, lightcurve shape, colour excess, and redshift. Methods: Our analysis is based on 89 type Ia supernovae at a redshift interval z = 0.05-0.3, for which multiband SDSS photometry is available. A lower-z spectroscopy reference sample was used for comparisons over cosmic time. We present measurements of time series of pseudo equivalent widths and line velocities of the main spectral features in type Ia supernovae. Results: Supernovae with shallower features are found predominantly among the intrinsically brighter slow declining supernovae. We detect the strongest correlation between lightcurve stretch and the Si ii λ4000 absorption feature, which also correlates with the estimated mass and star formation rate of the host galaxy. We also report a tentative correlation between colour excess and spectral properties. If confirmed, this would suggest that moderate reddening of type Ia supernovae is dominated by effects in the explosion or its immediate environment, as opposed to extinction by interstellar dust.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- methods: data analysis
- techniques: spectroscopic
- supernovae: general
- cosmology: observations
- line: profiles
- Cosmology
- Kosmologi
- Extragalactical astronomy
- Extragalaktisk astronomi
- Physics
- fysik
- Astronomy
- astronomi
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Nordin, Jakob
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Östman, Linda
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Goobar, Ariel
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Amanullah, Rahma ...
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Nichol, R. C.
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Smith, M.
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show more...
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Sollerman, Jespe ...
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Basset, B. A.
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Frieman, J. A.
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Garnavich, P. M.
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Leloudas, G.
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Sako, M.
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Schneider, D. P.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Astronomy and As ...
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Stockholm University