A Transiting Planet of a Sun-like Star
Abstract
A planet transits an 11th magnitude, G1V 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 ten 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 R_Sun, its mass is 1.0+-0.03 M_Sun, V sini < 3 km/s, 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+-0.07 M_Jupiter, 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 R_Sun, then the planetary radius is 1.30+-0.11 R_Jupiter and the inclination of the orbit is 87.7+-1.2 degrees. We have demonstrated a productive international collaboration between professional and amateur astronomers that was important to distinguishing this planet from many other similar candidates.
Cite
@article{arxiv.astro-ph/0605414,
title = {A Transiting Planet of a Sun-like Star},
author = {P. R. McCullough and J. E. Stys and Jeff A. Valenti and C. M. Johns-Krull and K. A. Janes and J. N. Heasley and B. A. Bye and C. Dodd and S. W. Fleming and A. Pinnick and R. Bissinger and B. L. Gary and P. J. Howell and T. Vanmunster},
journal= {arXiv preprint arXiv:astro-ph/0605414},
year = {2008}
}
Comments
31 pages, 9 figures, accepted for part 1 of ApJ