NOAO >   Observing Info >   Approved Programs >   2013A-0128

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Proposal Information for 2013A-0128


PI: Ellyn K. Baines, Naval Research Laboratory, ellyn.baines@nrl.navy.mil
Address: Remote Sensing Division, 4555 Overlook Ave SW, Washington, DC 20375, USA

CoI: Martin Vanko, Slovak Academy of Sciences
CoI: Pawel Zielinski, Nicolaus Copernicus University
CoI: Andrzej Niedzielski, Nicolaus Copernicus University
CoI: Aleksander Wolszczan, Pennsylvania State University

Title: Measuring Candidate Exoplanet Host Star Radii

Abstract: We propose to measure the radii of exoplanet host star candidates using the CHARA Array. The target sample consists of 17 giant and subgiant stars taken from Penn State-Torun Planet Search survey, and all of them are sufficiently bright and nearby that can be easily measured interferometrically. The radii of giant stars obtained from spectroscopic properties are usually ill-defined due to the indirect nature of the method used and evolutionary model dependency. However, the radius of the star is a critical parameter for the calculation of stellar luminosity and mass, which are often not well known for giant stars. Therefore, this problem also influences the determination of the orbital period, mass, and the surface temperature of the planet. Interferometric observations will significantly decrease the errors in these parameters.


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NOAO >   Observing Info >   Approved Programs >   2013A-0128

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