Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-08
Astrophys.J. 645 (2006) 470-479
Astronomy and Astrophysics
Astrophysics
17 pages, 12 figures. Accepted for publication in the Astrophysical Journal
Scientific paper
10.1086/504102
Spectral synthesis in 3-dimensional (3D) space for the earliest spectra of Type Ia supernovae (SNe Ia) is presented. In particular, the high velocity absorption features that are commonly seen at the earliest epochs ($\sim 10$ days before maximum light) are investigated by means of a 3D Monte Carlo spectral synthesis code. The increasing number of early spectra available allows statistical study of the geometry of the ejecta. The observed diversity in strength of the high velocity features (HVFs) can be explained in terms of a ``covering factor'', which represents the fraction of the projected photosphere that is concealed by high velocity material. Various geometrical models involving high velocity material with a clumpy structure or a thick torus can naturally account for the observed statistics of HVFs. HVFs may be formed by a combination of density and abundance enhancements. Such enhancements may be produced in the explosion itself or may be the result of interaction with circumstellar material or an accretion disk. Models with 1 or 2 blobs, as well as a thin torus or disk-like enhancement are unlikely as a standard situation.
Maeda Kei--ichi
Mazzali Paolo A.
Nomoto Ken'ichi
Tanaka Masaomi
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