... Very massivestar (having 40 solar mass or more at birth) evolved losing its hydrogen-rich envelope and helium layer, then finally the gravitational core collapse occured. ...
... similiar to SNIa, rather than to II-P. Both IIL and Ia are thought to result from the deflagration of C-O degenerate core of relatively low massstars, the only differance being that the II-L left a small hydrogen envelope at the time of the explosion ...