Analysis of Two Eclipsing Hot Subdwarf Binaries with a Low Mass Stellar and a Brown Dwarf Companion
Abstract
The formation of hot subdwarf stars (sdBs), which are core helium-burning stars located on the extended horizontal branch, is still not understood. Many of the known hot subdwarf stars reside in close binary systems with short orbital periods between a few hours and a few days with either M star or white dwarf companions. Common envelope ejection is the most probable formation channel. Among these, eclipsing systems are of special importance because it is possible to constrain the parameters of both components tightly by combining spectroscopic and light curve analyses. We report the discovery of two eclipsing binaries with a brown dwarf (<0.07 Msolar) and a 0.15 Msolar late main sequence star companion in close orbits around sdB stars.
- Publication:
-
Planetary Systems Beyond the Main Sequence
- Pub Date:
- March 2011
- DOI:
- 10.1063/1.3556199
- arXiv:
- arXiv:1102.0502
- Bibcode:
- 2011AIPC.1331..174S
- Keywords:
-
- eclipsing binary stars;
- brown dwarfs;
- white dwarfs;
- stellar mass;
- 95.10.Gi;
- 97.20.Vs;
- 97.20.Rp;
- 97.10.Nf;
- Eclipses transits and occultations;
- Low luminosity stars subdwarfs and brown dwarfs;
- Faint blue stars white dwarfs degenerate stars nuclei of planetary nebulae;
- Masses;
- Astrophysics - Earth and Planetary Astrophysics;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- Part of PlanetsbeyondMS/2010 proceedings http://arxiv.org/html/1011.6606