High-Resolution Spectroscopy of the Transiting Planet Host Star TrES-1

A. Sozzetti; D. Yong; G. Torres; D. Charbonneau; D. W. Latham; C. A. Prieto; T. M. Brown; B. W. Carney; J. B. Laird

doi:10.1086/426864

paper

High-Resolution Spectroscopy of the Transiting Planet Host Star TrES-1

arXiv:astro-ph/0410483 · doi:10.1086/426864

Abstract

We report on a spectroscopic determination of the stellar parameters and chemical abundances for the parent star of the transiting planet TrES-1. Based on a detailed analysis of iron lines in our Keck and HET spectra we derive $T_{eff} = 5250 \pm 75$ K, $lo g g = 4.6 \pm 0.2$ , and [Fe/H] $= 0.00 \pm 0.09$ . By measuring the \ion{Ca}{2} activity indicator and by putting useful upper limits on the Li abundance we constrain the age of TrES-1 to be $2.5 \pm 1.5$ Gyr. By comparing theoretical stellar evolution models with the observational parameters we obtain $M_{⋆} = 0.89 \pm 0.05$ $M_{⊙}$ , and $R_{⋆} = 0.83 \pm 0.05$ $R_{⊙}$ . Our improved estimates of the stellar parameters are utilized in a new analysis of the transit photometry of TrES-1 to derive a mass $M_{p} = 0.76 \pm 0.05$ $M_{J}$ , a radius $R_{p} = 1.0 4_{- 0.05}^{+ 0.08}$ $R_{J}$ , and an inclination $i = 8 9^{\circ} . 5_{- 1.3}^{+ 0.5}$ . The improved planetary mass and radius estimates provide the grounds for new crucial tests of theoretical models of evolution and evaporation of irradiated extrasolar giant planets.

arXiv comment14 pages, 3 figures, Astrophysical Journal Letters, accepted

High-Resolution Spectroscopy of the Transiting Planet Host Star TrES-1

Abstract

References in corpus (20)

Cited by in corpus (49)