A Transiting Planet of a Sun-like Star
Abstract
A planet transits an 11th magnitude, G1 V star in the constellation Corona Borealis. We designate the planet XO-1b and the star XO-1, also known as GSC 02041-01657. XO-1 lacks a trigonometric distance; we estimate it to be 200+/-20 pc. Of the 10 stars currently known to host extrasolar transiting planets, the star XO-1 is the most similar to the Sun in its physical characteristics: its radius is 1.0+/-0.08 Rsolar, its mass is 1.0+/-0.03 Msolar, its Vsini<3 km s-1, and its metallicity [Fe/H] is 0.015+/-0.04. The orbital period of the planet XO-1b is 3.941534+/-0.000027 days, one of the longer ones known. The planetary mass is 0.90+/-0.07MJ, which is marginally larger than that of other transiting planets with periods between 3 and 4 days. Both the planetary radius and the inclination are functions of the spectroscopically determined stellar radius. If the stellar radius is 1.0+/-0.08 Rsolar, then the planetary radius is 1.30+/-0.11RJ and the inclination of the orbit is 87.7d+/-1.2d. We have demonstrated a productive international collaboration between professional and amateur astronomers that was important to distinguishing this planet from many other similar candidates.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 2006
- DOI:
- 10.1086/505651
- arXiv:
- arXiv:astro-ph/0605414
- Bibcode:
- 2006ApJ...648.1228M
- Keywords:
-
- Stars: Binaries: Eclipsing;
- Stars: Planetary Systems;
- stars: individual (GSC 02041-01657);
- Techniques: Photometric;
- Techniques: Radial Velocities;
- Astrophysics
- E-Print:
- 31 pages, 9 figures, accepted for part 1 of ApJ