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- Preprint&Reprint
The Subaru Seminar is
usually held in Room 104 of the Hilo Base Facility, adjacent
to the main lobby. Everyone is welcome to attend. If you are
interested in giving a seminar, please contact Subaru
seminar organizers (Tomonori Usuda, Kumiko S. Usuda, Masahiko Hayashi, Masayuki Akiyama)
by email.
May 2, Monday at 3:30pm
" Probing the physics of supernova explosions with spectropolarimetry;
Lifan Wang (Lawrence Berkeley National Laboratory)
The tool of spectropolarimetry applied to supernovae has shown
that core collapse supernovae are strongly asymmetric and that
Type Ia supernovae are less so, but still systematically asymmetric.
These studies have led to new insights into the explosion mechanisms
of both core-collapse and thermonuclear supernovae. The explosion of
core-collapse supernovae is intrinsically 3-dimensional and there are
strong evidences that the explosion is affected by the rotation of the
progenitor star. Polarimetry studies of SN Ia may give long sought
clues to the binary nature of Type Ia supernovae. The outer most
layers of some SNIa are found to be consistent with being from
turbulent burning, but with iron confined into lower velocity
regions. These observations support the popular delayed-detonation
models but also provide clues for further improvement of explosion
models. These understandings of SNIa provide new insights into the
origin of the observed scatter in the properties of Type Ia. They may
help in making SN Ia even more precise tools of cosmology.