Accurate Low-Mass Stellar Models of KOI-126

Abstract

The recent discovery of an eclipsing hierarchical triple system with two low-mass stars in a close orbit (KOI-126) by Carter et al. (2011) 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.

5 pages, 2 figures, Accepted for publication to ApJL

References in corpus (5)

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• Evolution of low-mass star and brown dwarf eclipsing binaries
• KOI-126: A Triply-Eclipsing Hierarchical Triple with Two Low-Mass Stars
• Atomic Diffusion and Mixing in Old Stars I. VLT/FLAMES-UVES Observations of Stars in NGC 6397
• Absolute properties of the low-mass eclipsing binary CM Draconis

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