PTPS candidate exoplanet host star radii determination with CHARA Array

Paweł Zieliński, Martin Vaňko, Ellyn Baines, Andrzej Niedzielski, Aleksander Wolszczan

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish (US)
Title of host publicationFrom Interacting Binaries to Exoplanets
Subtitle of host publicationEssential Modeling Tools
EditorsMercedes Richards, Ivan Hubeny
Number of pages2
StatePublished - Jul 2011

Publication series

NameProceedings of the International Astronomical Union
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science


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