Abstract

Contributed Talk - Splinter CloseBinaries   (MW-0250)

dentifying double-detonation Supernova Ia progenitor systems in the galactic disk

Felix Arnon Teutloff
Universität Hamburg

Supernovae Ia (SNIa), the thermonuclear explosion of a White Dwarf (WD), are used as standardizable candles in the cosmic distance ladder to measure the largest distances in our universe. In the canonical picture this happens as the WD reaches the Chandrasekhar mass due to accretion from a close binary, explosively starting the Carbon-Oxygen burning in the core. Even though the explosion process is well studied, the progenitors have not been studied in detail so far. One possible evolution channel, the double-detonation (dd-SNIa) channel, describes a close binary system comprising a WD and a hot subdwarf star (sdO/B) with orbital periods of mathcal{O}(SI{1}{hour}). Due to the emission of gravitational waves the binary orbit shrinks until the sdO/B fills its Roche lobe and starts accreting Helium-rich material onto the WD, which builds up a layer that eventually ignites, compressing the core and starting the SNIa at sub-Chandrasekhar masses. To date, less than five dd-SNIa progenitor systems are known. The advent of large-scale surveys, such as BlackGEM and SDSS-V enables the systematic search for dd-SNIa progenitor systems. This presentation outlines our approach, initial results and further efforts to identify further dd-SNIa progenitor systems in the galactic disk.