Abstract

Contributed Talk - Splinter CloseBinaries   (MW-0250)

Building Double-Detonation Supernovae: The Evolutionary Pathway of sdB+WD Binaries

Stephania Hernandez, Summit K. Maheshwari, Thomas Kupfer, Matthias R.Schreiber, Diogo Belloni
Universität Hamburg, Universität Hamburg, Universität Hamburg, Universidad Tecnica Federico Santa Maria, International Centre of Supernovae

White dwarf (WD) stars in close binaries with Hot subdwarf B (sdB) companions are promising progenitors of double-detonation supernovae. Systems such as PTF1J2238+7430 provide useful benchmarks for understanding the evolutionary pathways leading to these configurations. We reconstruct the evolutionary history of PTF1J2238+7430 as a representative pathway in which the sdB forms first via stable mass-transfer, followed by the formation of the WD through a common-envelope (CE) phase. Using MESA, we perform detailed binary evolution simulations from the zero-age main-sequence to the present-day configuration, exploring initial masses, orbital periods, and mass-loss fractions, as well as angular momentum transfer, tidal interactions, and gravitational-wave-driven orbital evolution. Our models reproduce the observed system, consisting of a 0.406Ms sdB star and a 0.72Ms WD in a 76.34-minute orbit. The sdB forms through stable Roche-lobe overflow from a 2.7Ms donor, while the WD originates during the CE phase from an initially less massive companion that accreted mass during the stable mass-transfer phase. This study serves as a starting point for ongoing work involving extensive, systematic grids of binary evolution models. We have performed 106,000 simulations, with the goal of characterize the population of viable double-detonation supernova progenitors and placing constraints on their evolutionary channels.