NOAO >   Observing Info >   Approved Programs >   2017B-0118

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Program Information for 2017B-0118


PI: Kaspar Von Braun, Lowell Observatory, kaspar@lowell.edu
Address: 1400 W. Mars Hill Road, Flagstaff, AZ 86001 USA

CoI: Tabetha Boyajian, Louisiana State U.
CoI: Gerard Van Belle, Lowell Observatory
CoI: Tyler Ellis, Louisiana State U.

Title: Radii of late type-dwarfs, exoplanet hosts, and exoplanet host candidates

Abstract: We propose to use the CHARA Array in single baseline mode to measure fundamental properties of late-type dwarfs and exoplanet host stars. We aim to address the well-documented discrepancy between theory and observation: directly determined radii exceed theory predictions by $sim$5-10% especially for late-type dwarfs. Our results indicate that a change of the numerical value of the mixing-length parameter may reduce or eliminate radius discrepancies with stellar models. Additionally, we target the ever-growing number of stars known to host extrasolar planets / substellar companions. Stellar luminosities determine extent and location of the system habitable zones. Stellar radii enable model-independent measurements of radii of transiting planets, providing full orbital and astrophysical system characterizations. The principal scientific goals of this project in combination with our ongoing survey are to (1) significantly increase the number of low-mass stars with precise radius measurements, and (2) provide insights into exoplanetary environments by understanding the nature of the parent stars, such as stellar size, surface temperature, luminosity, planetary radiation environment, habitable zone, etc.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017B):  CHARA/Classic -- 30hrs


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2017B-0118

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