Navy Precision Optical Interferometer Observations of the Exoplanet Host κ Coronae Borealis and Their Implications for the Star's and Planet's Masses and Ages
Abstract
We used the Navy Precision Optical Interferometer to measure the limb-darkened angular diameter of the exoplanet host star κ CrB and obtained a value of 1.543 ± 0.009 mas. We calculated its physical radius (5.06 ± 0.04 R ⊙) and used photometric measurements from the literature with our diameter to determine κ CrB's effective temperature (4788 ± 17 K) and luminosity (12.13 ± 0.09 L ⊙). We then placed the star on an Hertzsprung-Russell diagram to ascertain the star's age (3.42^+0.32_-0.25 Gyr) and mass (1.47 ± 0.04 M ⊙) using a metallicity of [Fe/H] = +0.15. With this mass, we calculated the system's mass function with the orbital elements from a variety of sources, which produced a range of planetary masses: m psin i = 1.61-1.88 M Jup. We also updated the extent of the habitable zone for the system using our new temperature.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- July 2013
- DOI:
- 10.1088/2041-8205/771/1/L17
- arXiv:
- arXiv:1306.4322
- Bibcode:
- 2013ApJ...771L..17B
- Keywords:
-
- infrared: stars;
- stars: fundamental parameters;
- stars: individual: HD 142091;
- techniques: interferometric;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 13 pages, 2 figures, 2 tables