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213th Meeting of the American Astronomical Society with HAD and HEAD, Long Beach, CA : États-Unis (2009)
Direct Analysis of Type Ia Supernovae Observed by The Nearby Supernova Factory
T. Rollin, G. Aldering, P. Antilogus1, C. Aragon, S. Bailey1, C. Baltay, S. Bongard1, C. Buton2, M. Childress, Y. Copin2, E. Gangler2, J. Jerke, S. Loken, P. Nugent, R. Pain1, E. Pecontal3, R. Pereira1, S. Perlmutter, D. Rabinowitz, G. Rigaudier3, P. Ripoche1, K. Runge, R. Scalzo, G. Smadja2, H. Swift, C. Tao2, C. Wu1

Over the past four years, the Nearby Supernova Factory (SNfactory) has obtained hundreds of time-series spectra of Type Ia supernovae (SNe Ia) using its SuperNova Integral Field Spectrograph (SNIFS). This dataset is a promising resource for improving our understanding of SN Ia explosion physics and progenitor models --- key issues that, if resolved, could further improve the utility of and confidence in SNe Ia as reliable cosmological distance indicators. Using a new, automated direct analysis code we have developed (SYNAPPS), we have commenced a systematic study of the SNfactory spectroscopic data set. SYNAPPS solves for a highly parameterized synthetic spectrum consistent with the observed spectrum, enabling line identification and ejecta velocity measurements, while treating line-blending explicitly. These results provide important constraints on stellar explosion models. We present preliminary results including, for example, an investigation of some early-phase spectra, and examine trends in spectral behavior noted previously by others. We also address future directions for code development to bring about a deeper physics analysis of the data.
1 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
2 :  IPNL - Institut de Physique Nucléaire de Lyon
3 :  CRAL - Centre de Recherche Astrophysique de Lyon
Physique/Astrophysique/Astrophysique galactique

Planète et Univers/Astrophysique/Astrophysique galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique