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.
@article{arxiv.1109.4950,
title = {Fundamental Parameters of the Exoplanet Host K Giant Star iota Draconis from the CHARA Array},
author = {Ellyn K. Baines and Harold A. McAlister and Theo A. ten Brummelaar and Nils H. Turner and Judit Sturmann and Laszlo Sturmann and P. J. Goldfinger and Christopher D. Farrington and Stephen T. Ridgway},
journal= {arXiv preprint arXiv:1109.4950},
year = {2015}
}
Comments
Accepted to the Astrophysical Journal. arXiv admin note: substantial text overlap with arXiv:1103.2742