HAT-P-27b: A Hot Jupiter Transiting a G Star on a 3 Day Orbit
Abstract
We report the discovery of HAT-P-27b, an exoplanet transiting the moderately bright G8 dwarf star GSC 0333-00351 (V = 12.214). The orbital period is 3.039586 ± 0.000012 days, the reference epoch of transit is 2455186.01879 ± 0.00054 (BJD), and the transit duration is 0.0705 ± 0.0019 days. The host star with its effective temperature 5300 ± 90 K is somewhat cooler than the Sun and is more metal-rich with a metallicity of +0.29 ± 0.10. Its mass is 0.94 ± 0.04 M sun and radius is 0.90+0.05 - 0.04 R sun. For the planetary companion we determine a mass of 0.660 ± 0.033 M J and radius of 1.038+0.077 - 0.058 R J. For the 30 known transiting exoplanets between 0.3 M J and 0.8 M J, a negative correlation between host star metallicity and planetary radius and an additional dependence of planetary radius on equilibrium temperature are confirmed at a high level of statistical significance.
Based in part on observations obtained at the W. M. Keck Observatory, which is operated by the University of California and the California Institute of Technology. Keck time has been granted by NOAO (A201Hr) and NASA (N018Hr, N167Hr).- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 2011
- DOI:
- 10.1088/0004-637X/734/2/109
- arXiv:
- arXiv:1101.3511
- Bibcode:
- 2011ApJ...734..109B
- Keywords:
-
- planetary systems;
- stars: individual: HAT-P-27 GSC 0333-00351;
- techniques: photometric;
- techniques: spectroscopic;
- Astrophysics - Earth and Planetary Astrophysics;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- Submitted to ApJ on 2011-01-18. 12 pages, 7 figures, 7 tables