Post common envelope binary
A Post Common Envelope Binary, PCEB or pre-cataclysmic variable is a binary consisting of a white dwarf and a main-sequence star or a brown dwarf[1]. The star or brown dwarf shared a common envelope with the white dwarf progenitor in the red giant phase. In this scenario the star or brown dwarf looses angular momentum as it orbits within the envelope, eventually leaving a main-sequence star and white dwarf in a short-period orbit. A PCEB will continue to lose angular momentum via magnetic braking and gravitational waves and will eventually begin mass-transfer, resulting in a cataclysmic variable. While there are thousands of PCEBs known, there are only a few eclipsing PCEBs, also called ePCEBs.[2] Even more rare are PCEBs with a brown dwarf as the secondary.[1] A brown dwarf with a mass lower than 20 MJ might evaporate during the common envelope phase and therefore the secondary is supposed to have a mass higher than 20 MJ.[3]
List of post common envelope binaries
| Name | Period | Secondary | Note |
|---|---|---|---|
| NN Serpentis | 0.13 days | red dwarf | eclipsing binary |
| K 1-2 | 0.6758 days[4] | planetary nebula | |
| RR Caeli | 7.2 hours | red dwarf | eclipsing binary |
| KOI-256 | 1.37865 days[2] | red dwarf | eclipsing binary |
| WD 0137−349 | 116 minutes | brown dwarf | first confirmed PCEB with a brown dwarf as a companion |
See also
References
- ^ a b Casewell, S. L.; Braker, I. P.; Parsons, S. G.; Hermes, J. J.; Burleigh, M. R.; Belardi, C.; Chaushev, A.; Finch, N. L.; Roy, M.; Littlefair, S. P.; Goad, M. (2018-05-01). "The first sub-70 minute non-interacting WD-BD system: EPIC212235321". Monthly Notices of the Royal Astronomical Society. 476 (1): 1405–1411. doi:10.1093/mnras/sty245. ISSN 0035-8711.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ a b Muirhead, Philip S.; Vanderburg, Andrew; Shporer, Avi; Becker, Juliette; Swift, Jonathan J.; Lloyd, James P.; Fuller, Jim; Zhao, Ming; Hinkley, Sasha; Pineda, J. Sebastian; Bottom, Michael (2013-04-02). "Characterizing the Cool KOIs. V. KOI-256: A Mutually Eclipsing Post-Common Envelope Binary". The Astrophysical Journal. 767 (2): 111. doi:10.1088/0004-637X/767/2/111. ISSN 0004-637X.
- ^ information@eso.org. "A Sub-Stellar Jonah - Brown Dwarf Survives Being Swallowed". www.eso.org. Retrieved 2020-02-02.
- ^ Ritter, H.; Kolb, U. (June 2003). "Catalogue of cataclysmic binaries, low-mass X-ray binaries and related objects (Seventh edition)". A&A. 404: 301–303. doi:10.1051/0004-6361:20030330. ISSN 0004-6361.