Fundamental Parameters of the Exoplanet Host K Giant Star iota Draconis from the CHARA Array

Abstract

We measured the angular diameter of the exoplanet host star iota Dra with Georgia State University's Center for High Angular Resolution Astronomy (CHARA) Array interferometer, and, using the star's parallax and photometry from the literature, calculated its physical radius and effective temperature. We then combined our results with stellar oscillation frequencies from Zechmeister et al. (2008) and orbital elements from Kane et al. (2010) to determine the masses for the star and exoplanet. Our value for the central star's mass is 1.82 +/- 0.23 M_Sun, which means the exoplanet's minimum mass is 12.6 +/- 1.1 M_Jupiter. Using our new effective temperature, we recalculated the habitable zone for the system, though it is well outside the star-planet separation.

Accepted to the Astrophysical Journal. arXiv admin note: substantial text overlap with arXiv:1103.2742

References in corpus (5)

• Basic physical parameters of a selected sample of evolved stars
• Habitability of known exoplanetary systems based on measured stellar properties
• The limb-darkened Arcturus; Imaging with the IOTA/IONIC interferometer
• The Discovery of Stellar Oscillations in the K Giant $\iota$ Dra
• On the Transit Potential of the Planet Orbiting iota Draconis

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• Interferometric diameters of five evolved intermediate-mass planet-hosting stars measured with PAVO at the CHARA Array
• The Physical Parameters of the Retired A Star HD185351
• Beyond the Main Sequence: Testing the accuracy of stellar masses predicted by the PARSEC evolutionary tracks
• A search for radio emission from exoplanets around evolved stars
• Revisiting the Red-giant Branch Hosts KOI-3886 and $\iota$ Draconis. Detailed Asteroseismic Modeling and Consolidated Stellar Parameters
• Spectroscopic and Interferometric Measurements of Nine K Giant Stars
• High-Contrast Imaging of Intermediate-Mass Giants with Long-Term Radial Velocity Trends
• Asteroseismology of iota Draconis and Discovery of an Additional Long-Period Companion