Hot subdwarfs - Small stars marking important events in stellar evolution
S. Geier

TL;DR
This paper investigates hot subdwarfs as key indicators of critical stellar evolution events, emphasizing binary interactions, substellar companions, and their role in supernova progenitors and hypervelocity stars.
Contribution
It provides the first comprehensive study of close binary sdBs, highlighting the significance of star-substellar interactions and identifying a potential supernova progenitor system.
Findings
Discovery of sdB binaries with brown dwarf companions.
Identification of an sdB-white dwarf binary as a supernova progenitor candidate.
Connection between hypervelocity hot subdwarfs and supernova events.
Abstract
Hot subdwarfs are considered to be the compact helium cores of red giants, which lost almost their entire hydrogen envelope. What causes this enormous mass loss is still unclear. Binary interactions are invoked and a significant fraction of the hot subdwarf population is indeed found in close binaries. In a large project we search for the close binary sdBs with the most and the least massive companions. Significantly enhancing the known sample of close binary sdBs we performed the first comprehensive study of this population. Triggered by the discovery of two sdB binaries with close brown dwarf companions in the course of this project, we were able to show that the interaction of stars with substellar companions is an important channel to form sdB stars. Finally, we discovered a unique and very compact binary system consisting of an sdB and a massive white dwarf, which qualifies as…
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