APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker: Elena Sorokina (Sternberg astronomical Institute)
Title: Expansion Opacity in Supernova Models: Line Lists and the Shape of Type Ia Supernova Light Curves
Date (JST): Wed, Oct 07, 2015, 15:40 - 16:40
Place: Seminar Room A
Abstract: Spectral lines are the main source of opacity for Type Ia Supernovae (SNe Ia), so correct treatment of them during the opacity calculation of expanding SN Ia ejecta is crucially important. In fact, the line list can change the shape of the light curve of SN Ia. We choose an extended Kurucz' line list which contains more than 43 million theoretically predicted lines as well as experimentally confirmed ones (CD1) and check the saturation effect: whether we need to use 25 million lines or lesser sub-list is enough. We suggest a fast statistical method of expansion opacity calculations. We apply this method to the calculations of the light curves of SNe Ia, either naked, or covered by circumstellar matter. We check how switching to the huge line list changes the shape of the light curve of SN Ia. This can be important for the interpretation of cosmological application of SNe Ia, since brightness of SNe Ia is based on the SN Ia light curve shape.