منابع مشابه
Type Ia Supernovae
Type Ia Supernovae are in many aspects still enigmatic objects. Their observational and theoretical exploration is in full swing, but we still have plenty to learn about these explosions. Recent years have already witnessed a bonanza of supernova observations. The increased samples from dedicated searches have allowed the statistical investigation of Type Ia Supernovae as a class. The observati...
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Aims. We present a quantitative study of a new data set of high redshift Type Ia supernovae spectra, observed at the Gemini telescopes during the first 34 months of the Supernova Legacy Survey. During this time 123 supernovae candidates were observed, of which 87 have been identified as SNe Ia at a median redshift of z = 0.720. Spectra from the entire second year of the survey and part of the t...
متن کاملDust around Type Ia supernovae
An explanation is given of the low value of Rλ ≡ Aλ/E(B − V ), the ratio of absolute to selective extinction deduced from Type Ia supernova observations. The idea involves scattering by dust clouds located in the circumstellar environment, or at the highest velocity shells of the supernova ejecta. The scattered light tends to reduce the effective Rλ in the optical, but has an opposite effect in...
متن کاملCosmology with Type Ia supernovae
Since 1998 (Riess et al. 1, Perlmutter et al. 2), surveys of cosmologically distant Type Ia supernovae (SNe Ia) have indicated an acceleration of the expansion of the Universe, distant SNe Ia being dimmer that expected in a decelerating Universe. With the assumption that the Universe can be described on average as isotropic and homogeneous, this acceleration implies either the existence of a fl...
متن کاملType Ia supernovae: spectroscopic surprises
Recent observations have extended the range of diversity among spectra of Type Ia supernovae. I briefly discuss SN Ia explosion models in the spectroscopic context, the observed diversity, and some recent results obtained with the Synow code for one normal and two peculiar SNe Ia. Relating the observational manifestations of diversity to their physical causes is looking like an ever more challe...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2008
ISSN: 0004-6256,1538-3881
DOI: 10.1088/0004-6256/135/4/1598