Novel Model of an Ultra-stripped Supernova Progenitor of a Double Neutron Star

(Inlist_2NS.tar.gz =inlist_2NS.zip) Recent discoveries of double neutron star (DNS) mergers and ultra-stripped supernovae (SNe) raise the questions of their origin and connection. We present the 1D model of a DNS progenitor system which is calculated self-consistently until an ultra-stripped iron core collapse. We apply the MESA code starting from a post-common envelope binary consisting of a  NS and a zero-age main-sequence helium star and continue the modelling via Case BB Roche-lobe over ow until the infall velocity of the collapsing iron core exceeds 1000 kms^-1. Depending on the initial conditions, this family of systems is anticipated to reproduce the DNS mergers detected by the LIGO-network.