Document Type

Article

Publication Date

10-10-2011

Publication Title

Letters of the Astrophysical Journal

Department

Department of Physics and Astronomy

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.

DOI

10.1088/2041-8205/740/1/L25

Original Citation

Gregory A. Feiden et al 2011 ApJL 740 L25

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