The effect of magnetic activity on low-mass stars in eclipsing binaries

Abstract

In recent years, analyses of eclipsing binary systems have unveiled differences between the observed fundamental properties of low-mass stars and those predicted by stellar structure models. Particularly, radius and effective temperatures computed from models are ~ 5-10% lower and ~ 3-5% higher than observed, respectively. These discrepancies have been attributed to different factors, notably to the high levels of magnetic activity present on these stars. In this paper, we test the effect of magnetic activity both on models and on the observational analysis of eclipsing binaries using a sample of such systems with accurate fundamental properties. Regarding stellar models, we have found that unrealistically high spot coverages need to be assumed to reproduce the observations. Tests considering metallicity effects and missing opacities on models indicate that these are not able to explain the radius discrepancies observed. With respect to the observations, we have tested the effect of several spot distributions on the light curve analysis. Our results show that spots cause systematic deviations on the stellar radii derived from light curve analysis when distributed mainly over the stellar poles. Assuming the existence of polar spots, overall agreement between models and observations is reached when ~ 35% spot coverage is considered on stellar models. Such spot coverage induces a systematic deviation in the radius determination from the light curve analysis of ~ 3% and is also compatible with the modulations observed on the light curves of these systems. Finally, we have found that the effect of activity or rotation on convective transport in partially radiative stars may also contribute to explain the differences seen in some of the systems with shorter orbital periods.

12 pages, 9 figures, accepted for publication in ApJ

References in corpus (10)

• Evolution of low-mass star and brown dwarf eclipsing binaries
• Imaging the Surface of Altair
• Hubble Space Telescope times-series photometry of the planetary transit of HD189733: no moon, no rings, starspots
• M dwarfs: effective temperatures, radii and metallicities
• Absolute properties of the low-mass eclipsing binary CM Draconis
• The effect of activity on stellar temperatures and radii
• First Results from the CHARA Array. IV. The Interferometric Radii of Low-Mass Stars
• Observational Evidence for Tidal Interaction in Close Binary Systems
• Estimating stellar rotation from starspot detection during planetary transits
• Magnetic activity on AB Doradus: Temporal evolution of starspots and differential rotation from 1988 to 1994

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