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PTPS Candidate Exoplanet Host Star Radii Determination with CHARA Array

Published online by Cambridge University Press:  23 April 2012

Paweł Zieliński ,
Martin Vaňko ,
Ellyn Baines ,
Andrzej Niedzielski  and
Aleksander Wolszczan
Paweł Zieliński
Affiliation:
Toruń Centre for Astronomy, Nicolaus Copernicus University, Gagarina 11, 87100 Toruń, Poland, email: [email protected]
Martin Vaňko
Affiliation:
Astronomical Institute, Slovak Academy of Sciences, 05960 Tatranská Lomnica, Slovakia
Ellyn Baines
Affiliation:
Naval Research Laboratory, Remote Sensing Division, 4555 Overlook Ave. S.W., Washington, DC 20375
Andrzej Niedzielski
Affiliation:
Toruń Centre for Astronomy, Nicolaus Copernicus University, Gagarina 11, 87100 Toruń, Poland, email: [email protected]
Aleksander Wolszczan
Affiliation:
Department for Astronomy and Astrophysics & Center for Exoplanets and Habitable Worlds, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802
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Abstract

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We propose to measure the radii of the Penn State - Toruń Planet Search (PTPS) exoplanet host star candidates using the CHARA Array. Stellar radii estimated from spectroscopic analysis are usually inaccurate due to indirect nature of the method and strong evolutionary model dependency. Also, the so-called degeneracy of stellar evolutionary tracks due to convergence of many tracks in the giant branch decreases the precision of such estimates. However, the radius of a star is a critical parameter for the calculation of stellar luminosity and mass, which are often not well known especially for giants. With well determined effective temperature (from spectroscopy) and radius, the luminosity may be calculated precisely. In turn also stellar mass may be estimated much more precisely. Therefore, direct radii measurements increase precision in the determination of planetary candidates masses and the surface temperatures of the planets.

Keywords

techniques: interferometricstars: fundamental parametersstars: late-typeplanetary systems
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S282: From Interacting Binaries to Exoplanets: Essential Modeling Tools , July 2011 , pp. 203 - 204
Copyright
Copyright © International Astronomical Union 2012

References

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