The Transiting Extrasolar Giant Planet around the Star OGLE-TR-113
Abstract
We report the independent discovery of a new extrasolar transiting planet around OGLE-TR-113, a candidate star from the Optical Gravitational Lensing Experiment. Small radial velocity variations have been detected based on observations conducted with the MIKE spectrograph on the Magellan I (Baade) telescope at the Las Campanas Observatory (Chile) during 2003. We have also carried out a light-curve analysis incorporating new photometry and realistic physical parameters for the star. OGLE-TR-113b has an orbital period of only 1.43 days, a mass of (1.08+/-0.28)MJup, and a radius of (1.09+/-0.10)RJup. Similar parameters have been obtained very recently in an independent study by Bouchy et al., from observations taken a year later. The orbital period of OGLE-TR-113b and the previously announced planet OGLE-TR-56b (Porb=1.21 days)-the first two found photometrically-are much shorter than the apparent cutoff of close-in giant planets at 3-4 day periods found in high-precision radial velocity surveys. Along with a third case reported by Bouchy et al. (OGLE-TR-132b, Porb=1.69 days), these objects appear to form a new class of ``very hot Jupiters'' that pose very interesting questions for theoretical study.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- July 2004
- DOI:
- 10.1086/422600
- arXiv:
- arXiv:astro-ph/0404541
- Bibcode:
- 2004ApJ...609L..37K
- Keywords:
-
- Line: Profiles;
- Stars: Planetary Systems;
- Stars: Evolution;
- Stars: Individual: Alphanumeric: OGLE-TR-113;
- Techniques: Radial Velocities;
- Astrophysics
- E-Print:
- Submitted to ApJL, additional color figures and data files at http://www.gps.caltech.edu/~maciej/TR-113/OGLE-TR-113b.html