We report the discovery of HAT-P-8b, a transiting planet with mass M p = 1.52+0.18 -0.16 M J, radius R p = 1.50+0.08 -0.06 R J, and photometric period P = 3.076 days. HAT-P-8b has a somewhat inflated radius for its mass, and a somewhat large mass for its period. The host star is a solar-metallicity F dwarf, with mass M sstarf = 1.28 ± 0.04 M sun and R sstarf = 1.58+0.08 -0.06 R sun. HAT-P-8b was initially identified as one of the 32 transiting-planet candidates in HATNet field G205. We describe the procedures that we have used to follow up these candidates with spectroscopic and photometric observations, and we present a status report on our interpretation for 28 of the candidates. Eight are eclipsing binaries with orbital solutions whose periods are consistent with their photometric ephemerides; two of these spectroscopic orbits are single-lined and six are double-lined.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 (A285Hr).
The Astrophysical Journal
- Pub Date:
- October 2009
- planetary systems;
- stars: individual: HAT-P-8 GSC 02757-01152;
- techniques: spectroscopic;
- 16 pages, 6 figures, 13 tables