System Parameters, Transit Times, and Secondary Eclipse Constraints of the Exoplanet Systems HATP4, TrES2, TrES3, and WASP3 from the NASA EPOXI Mission of Opportunity
Abstract
As part of the NASA EPOXI Mission of Opportunity, we observed seven known transiting extrasolar planet systems in order to construct time series photometry of extremely high phase coverage and precision. Here we present the results for four "hotJupiter systems" with nearsolar stars—HATP4, TrES3, TrES2, and WASP3. We observe 10 transits of HATP4, estimating the planet radius R_{p} = 1.332 ± 0.052 R _{Jup}, the stellar radius R _{sstarf} = 1.602 ± 0.061 R _{sun}, the inclination i = 89.67 ± 0.30 deg, and the transit duration from first to fourth contact τ = 255.6 ± 1.9 minutes. For TrES3, we observe seven transits and find R_{p} = 1.320 ± 0.057 R _{Jup}, R _{sstarf} = 0.817 ± 0.022 R _{sun}, i = 81.99 ± 0.30 deg, and τ = 81.9 ± 1.1 minutes. We also note a longterm variability in the TrES3 light curve, which may be due to star spots. We observe nine transits of TrES2 and find R_{p} = 1.169 ± 0.034 R _{Jup}, R _{sstarf} = 0.940 ± 0.026 R _{sun}, i = 84.15 ± 0.16 deg, and τ = 107.3 ± 1.1 minutes. Finally, we observe eight transits of WASP3, finding R_{p} = 1.385 ± 0.060 R _{Jup}, R _{sstarf} = 1.354 ± 0.056 R _{sun}, i = 84.22 ± 0.81 deg, and τ = 167.3 ± 1.3 minutes. We present refined orbital periods and times of transit for each target. We state 95% confidence upper limits on the secondary eclipse depths in our broadband visible bandpass centered on 650 nm. These limits are 0.073% for HATP4, 0.062% for TrES3, 0.16% for TrES2, and 0.11% for WASP3. We combine the TrES3 secondary eclipse information with the existing published data and confirm that the atmosphere likely does not have a temperature inversion.
 Publication:

The Astrophysical Journal
 Pub Date:
 January 2011
 DOI:
 10.1088/0004637X/726/2/94
 arXiv:
 arXiv:1011.2229
 Bibcode:
 2011ApJ...726...94C
 Keywords:

 eclipses;
 planetary systems;
 stars: individual: HATP4 WASP3 TrES2 TrES3;
 Astrophysics  Earth and Planetary Astrophysics
 EPrint:
 34 pages, 21 figures, accepted by ApJ