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HAT-P-1b: A Large-Radius, Low-Density Exoplanet Transiting one Member of a Stellar Binary | G. A. Bakos
; R. W. Noyes
; G. Kovacs
; D. W. Latham
; D. D. Sasselov
; G. Torres
; D. A. Fischer
; R. P. Stefanik
; B. Sato
; J. A. Johnson
; A. Pal
; G. W. Marcy
; R. P. Butler
; G. A. Esquerdo
; K. Z. Stanek
; J. Lazar
; I. Papp
; P. Sari
; B. Sipocz
; | Date: |
13 Sep 2006 | Abstract: | 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. | Source: | arXiv, astro-ph/0609369 | Services: | Forum | Review | PDF | Favorites |
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