"supernova" is the phenomena of the explosion when the star evolved into the end of the life. In the case of Type Ia supernova, the light curve should reach maximum in three weeks after explosion. Our main goal is to obtain spectra earlier than two week before maximum. The spectra may be show the direct evidence whether the material in the outermost layer is synthesized to intermediate mass elements like Si, S ,Ca and so on, or, leaves the progenitor material unburnt like C and O. The expanding velocity of outer layer must be very high, which might be reached the ten first of light speed.

* はてなダイアリーキーワード:supernova