ACCURATE LOW-MASS STELLAR MODELS OF KOI-126

作者：Feiden Gregory A^*; Chaboyer Brian; Dotter Aaron

来源：Astrophysical Journal Letters, 2011, 740(1): L25.

DOI：10.1088/2041-8205/740/1/L25

• binaries: eclipsing
• stars: evolution
• stars: low-mass
• starspots

The recent discovery of an eclipsing hierarchical triple system with two low-mass stars in a close orbit (KOI-126) by Carter et al. appeared to reinforce the evidence that theoretical stellar evolution models are not able to reproduce the observational mass-radius relation for low-mass stars. We present a set of stellar models for the three stars in the KOI-126 system that show excellent agreement with the observed radii. This agreement appears to be due to the equation of state implemented by our code. A significant dispersion in the observed mass-radius relation for fully convective stars is demonstrated; indicative of the influence of physics currently not incorporated in standard stellar evolution models. We also predict apsidal motion constants for the two M dwarf companions. These values should be observationally determined to within 1% by the end of the Kepler mission.

• 出版日期2011-10-10