MG14 - Talk detail

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Abstract

​All stars with an initial mass greater than 8 solar masses, but not massive enough to encounter the pair-production instability, eventually form a degenerate core and collapse to form a compact object, either a neutron star or a black hole. We have performed a large grid simulations designed to cover wide range of progenitor and explosion properties. Using MESA STAR, we compute a set of massive star models (12–30 solar masses) from the main sequence until core collapse. We then generate explosions with V1D to produce ejecta within a range of explosion energies and yields. Finally, all ejecta are evolved with CMFGEN to generate multi-band light curves and spectra. Low-energy explosions, characterized by low ejecta expansion rates, are more suitable for reliable spectral line identifications. Based on our models, we discuss the distinct signatures of low-energy explosions in lower and higher mass models. One important goal is to identify whether there is a progenitor-mass bias leading to such events.

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