Fundamental Astrophysical Parameters For The Late-type Exoplanet Host Stars Gj 581, Gj 614, And Gj 649

Details Fundamental Astrophysical Parameters For The Late-type Exoplanet Host Stars Gj 581, Gj 614, And Gj 649 Fundamental Astrophysical Parameters For The Late-type Exoplanet Host Stars Gj 581, Gj 614, And Gj 649

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21741504v&link_type=abstract

American Astronomical Society, AAS Meeting #217, #415.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

The precision in the determination of the fundamental astrophysical parameters of extrasolar planets is, at best, as good as the precision in the characterization of their respective host stars, except in the currently rare cases in which the planets are directly imaged. Furthermore, the formation, evolution, and radiation environment of extrasolar planets are sensitively dependent on the astrophysical properties of the parent stars, including location and size of the habitable zone. The determination of these stellar astrophysical parameters is therefore critical to insights into exoplanet characterization. We use interferometric measurements obtained with the CHARA Array coupled with Hipparcos parallaxes to directly determine linear radii of the late-type exoplanet hosting stars GJ 581, GJ 614 (14 Her), and GJ 649. We additionally calculate their effective temperatures by means of spectral energy distribution fitting. Finally, we use literature log g values, combined with our directly determined radii, to constrain stellar masses. Of these targets, GJ 581 is of particular interest since it hosts four planets of which two are super earths and another one is in the habitable zone. In our presentation, we show the values of the stellar parameters and compare them to literature values calculated in a different manner.

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