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This white paper describes the LSST Dark Energy Science Collaboration (DESC), whose goal is the study of dark energy and related topics in fundamental physics with data from the Large Synoptic Survey Telescope (LSST). It provides an overview of dark energy science and describes the current and anticipated state of the field. It makes the case for the DESC by laying out a robust analytical framework for dark energy science that has been defined by its members and the comprehensive three-year work plan they have developed for implementing that framework. The analysis working groups cover five key probes of dark energy: weak lensing, large scale structure, galaxy clusters, Type Ia supernovae, and strong lensing. The computing working groups span cosmological simulations, galaxy catalogs, photon simulations and a systematic software and co...
Aims: We present 139 spectra of 124 Type Ia supernovae (SNe Ia) that were observed at the ESO/VLT during the first three years of the Canada-France-Hawaï Telescope (CFHT) supernova legacy survey (SNLS). This homogeneous data set is used to test for redshift evolution of SN Ia spectra, and will be used in the SNLS 3rd year cosmological analyses. Methods: Spectra have been reduced and extracted with a dedicated pipeline that uses photometric information from deep CFHT legacy survey (CFHT-LS) reference images to trace, at sub-pixel accuracy, the position of the supernova on the spectrogram as a function of wavelength. It also separates the supernova and its host light in ~60% of cases. The identification of the supernova candidates is performed using a spectrophotometric SN Ia model. Results: A total of 124 SNe Ia, roughly 50% of the over...
We discuss the comprehensive analysis of spectrophotometric time-series observations of the Type Ia supernova SNF20080514-002. The data consist of 20 SuperNova Integral Field Spectrograph (SNIFS) spectra sampled over 50 days, commencing at 10 days before peak brightness. The analysis is part of a systematic effort to map out the time-dependent manifestation of ion species in Type Ia supernova spectra in detail. In general, the SN is relatively normal, but it possesses some noteworthy characteristics we explore in detail. C II footprints are detected in the spectra leading up to maximum light, suggesting that unburned material may be mixed with intermediate mass burning products. Though the light-curve qualifies as a moderately fast-decliner (s=0.87), its UV-optical colors are unusually blue. We attempt to place these findings into the ...
During the 2004-2008 period the Nearby Supernova Factory discovered ~1000 supernovæ, and obtained detailed spectrophotometric time series of ~190 SNe Ia with the SuperNova Integral Field Spectrograph. These supernovæ are located in the nearby Hubble flow (0.03
The Nearby Supernova Factory has successfully carried out a 4 year program of discovery and spectrophotometric follow-up of nearby Hubble-flow supernovae. The discoveries have been made from an impartial wide-field CCD survey spanning some 25,000 sq. degrees of sky to R 20 at between 30 and 150 epochs. This approach has resulted in over 1000 supernova discoveries, of which some 600 are spectroscopically confirmed and with almost 400 of these being Type Ia. Detailed spectrophotometric time series have been obtained for approximatiely 160 of the Type Ia supernovae for use as cosmological distance indicators and to probe the physics of supernovae. This presentation will highlight on-going studies of spectral luminosity indicators, a new low-redshift Hubble diagram, host galaxy properties, and an informal census of unusual supernovae disco...
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