NOAO >   Observing Info >   Approved Programs >   2012A-0172

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Proposal Information for 2012A-0172


PI: Yilen Gomez Maqueo Chew, Vanderbilt University, yilen.gomez@vanderbilt.edu
Address: Physics Department, 6301 Stevenson Center Lane, Nashville, TN 37235, USA

CoI: Francesca Faedi, Queen's University Belfast
CoI: Leslie Hebb, Vanderbilt University
CoI: Don Pollacco, Queen's University Belfast
CoI: Keivan Stassun, Vanderbilt University
CoI: Luan Ghezzi, Observatorio Nacional
CoI: Phillip Cargile, Vanderbilt University
CoI: Susana Barros, Queen's University Belfast
CoI: Barry Smalley, Keele University
CoI: Claude Mack, Vanderbilt University

Title: Homogeneous Characterization of Transiting Exoplanet Systems

Abstract: We aim to obtain a homogeneous set of high resolution, high signal- to-noise (S/N) spectra for a large and diverse sample of stars with transiting planets, using the Kitt Peak 4-m echelle spectrograph for bright Northern targets (7.7<V<11.7). We will consistently derive stellar parameters such as \teff, \feh, \logg, and \vsini by using four different spectral characterization tools %Our technique combines state- of-the-art spectral analysis with to derive the best parameters with formal and systematic uncertainties. By means of our homogeneous analysis of this high-quality dataset, we will be able to investigate any systematic uncertainties on the derived stellar properties, and consequently, on the planetary properties derived from the iterative combination of our spectral analysis with the best available radial velocity data and transit photometry. % to derive a homogeneous set of properties for the transiting systems. The resulting consistent set of physical properties will allow us to further explore known correlations, e.g., core-size of the planet and stellar metallicity, and to newly identify subtle relationships providing insight into our understanding of planetary formation, structure, and evolution. Our pilot study analyzing our WASP-13 HIRES spectrum (R~48 000, S/N>150) in combination with high precision light curves shows an improvement in the precision of the stellar parameters of 60% in \teff, 75% in \feh, 82% in \mstar, and 73% in \rstar, which translates into a 64% improvement in the precision of \rpl, and more than 2% on \mpl, relative to the discovery paper's values.


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NOAO >   Observing Info >   Approved Programs >   2012A-0172

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