Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-09-13
Astrophys.J.656:552-559,2007
Astronomy and Astrophysics
Astrophysics
8 pages, accepted for publication in ApJ, see also http://www.hatnet.hu (www.hatnet.hu)
Scientific paper
10.1086/509874
Using small automated telescopes in Arizona and Hawaii, the HATNet project has detected an object transiting one member of the double star system ADS 16402 AB. This system is a pair of G0 main-sequence stars with age about 3 Gyr at a distance of ~139 pc and projected separation of ~1550 AU. The transit signal has a period of 4.46529 days and depth of 0.015 mag. From follow-up photometry and spectroscopy, we find that the object is a "hot Jupiter" planet with mass about 0.53 M_jup and radius ~1.36 R_jup traveling in an orbit with semimajor axis 0.055 AU and inclination about 85.9 deg, thus transiting the star at impact parameter 0.74 of the stellar radius. Based on a data set spanning three years, ephemerides for the transit center are: T_C = 2453984.397 + N_tr * 4.46529. The planet, designated HAT-P-1b, appears to be at least as large in radius, and smaller in mean density, than any previously-known planet.
Bakos Gustav A.
Butler Paul R.
Esquerdo Gilbert A.
Fischer Debra Ann
Johnson Jennifer A.
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