Discovery of the Closest Hot Subdwarf Binary with White Dwarf Companion

Geier, S.; Marsh, T. R.; Dunlap, B. H.; Barlow, B. N.; Schaffenroth, V.; Ziegerer, E.; Heber, U.; Kupfer, T.; Maxted, P. F. L.; Miszalski, B.; Shporer, A.; Telting, J. H.; Ostensen, R. H.; O'Toole, S. J.; Gänsicke, B. T.; Napiwotzki, R.

Abstract

We report the discovery of an extremely close, eclipsing binary system. A white dwarf is orbited by a core He-burning compact hot subdwarf star with a period as short as ≃ 0.04987 d making this system the most compact hot subdwarf binary discovered so far. The subdwarf will start to transfer helium-rich material on short timescales of less than 50 Myr. The ignition of He-burning at the surface may trigger carbon-burning in the core although the WD is less massive than the Chandrasekhar limit (> 0.74 M☉) making this binary a possible progenitor candidate for a supernova type Ia event.

Citation

Geier, S., Marsh, T. R., Dunlap, B. H., Barlow, B. N., Schaffenroth, V., Ziegerer, E., …Napiwotzki, R. (2013). Discovery of the Closest Hot Subdwarf Binary with White Dwarf Companion. In 18th European White Dwarf Workshop (EUROWD12) (373)

• Conference Location: Pedagogical University of Cracow, Poland
• Start Date: Aug 13, 2012
• End Date: Aug 17, 2012
• Publication Date: 2013
• Deposit Date: Jun 15, 2023
• Pages: 373
• Book Title: 18th European White Dwarf Workshop (EUROWD12)
• ISBN: 978-1-58381-820-6
• Publisher URL: https://www.aspbooks.org/a/volumes/article_details/?paper_id=35301