2009/02/12 by S. Daemgen, F. Hormuth, W. Brandner +5 · 1 citation
Mathematics · Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Binary number #Biology #Computer science #Exoplanet #Host (biology) #Light curve #Mathematics #Physics #Planet #Planetary system #RADIUS #Star (game theory) #Stars #Stellar, planetary, and galactic studies #Transit (satellite) #astro-ph.EP #astro-ph.SR
paper · pdf · doi:10.1051/0004-6361/200810988
9 pages, 3 Figures. Accepted by A&A
arxiv created 2009/02/12 · openalex publication_date 2009/03/11 · arxiv updated 2015/05/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
<i>Context. <i/>Straight-forward derivation of planetary parameters can only be achieved in transiting planetary systems. However, planetary attributes such as radius and mass strongly depend on stellar host parameters. Discovering a transit host star to be multiple leads to a necessary revision of the derived stellar and planetary parameters.<i>Aims. <i/>Based on our observations of 14 transiting exoplanet hosts, we derive parameters of the individual components of three transit host stars (WASP-2, TrES-2, and TrES-4) which we detected to be binaries. Two of these have not been known to be multiple before. Parameters of the corresponding exoplanets are revised.<i>Methods. <i/>High-resolution “Lucky Imaging” with AstraLux at the 2.2 m Calar Alto telescope provided near diffraction limited images in <i>i'<i/> and <i>z'<i/> passbands. These results have been combined with existing planetary data in order to recalibrate planetary attributes.<i>Results. <i/>Despite the faintness (<i>Δ<i/>mag ~ 4) of the discovered stellar companions to TrES-2, TrES-4, and WASP-2, light-curve deduced parameters change by up to more than 1<i>σ<i/>. We discuss a possible relation between binary separation and planetary properties, which – if confirmed – could hint at the influence of binarity on the planet formation process.