T. Mocnik, J. Pepper, S. R. Kane, J. E. Rodriguez, T. L. Campante, P. A. Dalba, N. R. Hinkel, D. Huber, K. G. Stassun, A. Vanderburg

Abstract
The exoplanet HD 118203b, orbiting a bright (V = 8.05) host star, was discovered using the radial velocity method by da Silva et al. (2006), but was not previously known to transit. TESS photometry has revealed unambiguous transits, allowing us to measure the radius of the planet. With an orbital period of 6.13 days, the planet has 2.1 Jupiter masses, 1.1 Jupiter radii, and the host star is a slightly evolved K0 subgiant. With an eccentricity of 0.31, the planet occupies a transitional regime between circularized hot Jupiters and more dynamically complex planets at longer orbital periods. Given the bright host star, the system presents opportunities for both atmospheric and asteroseismic studies. From the nominal 2-year mission, TESS is expected to reveal novel transit detections for a only few exoplanets that have been discovered with the radial velocity method and have not been known to transit prior to the TESS mission. HD 118203b is one of the first such detections.

American Astronomical Society meeting #235

Bulletin of the American Astronomical Society
1
Volume 52, Number 349.
2020 January

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