TESS Reveals HD 118203 b to be a Transiting Planet

Joshua Pepper, Stephen R. Kane, Joseph E. Rodriguez, Natalie R. Hinkel, Jason D. Eastman, Tansu Daylan, Teo Mocnik, Paul A. Dalba, B. Scott Gaudi, Tara Fetherolf, Keivan G. Stassun, Tiago L. Campante, Tiago L. Campante, Andrew Vanderburg, Daniel Huber, Diego Bossini, Ian Crossfield, Ian Crossfield, Steve B. Howell, Andrew W. StephensE. Furlan, George R. Ricker, Roland Vanderspek, David W. Latham, S. Seager, S. Seager, S. Seager, Joshua N. Winn, Jon M. Jenkins, Joseph D. Twicken, Joseph D. Twicken, Mark Rose, Jeffrey C. Smith, Jeffrey C. Smith, Ana Glidden, Ana Glidden, Alan M. Levine, Stephen Rinehart, Karen A. Collins, Andrew W. Mann, Jennifer A. Burt, David J. James, David J. James, Robert J. Siverd, Maximilian N. Günther

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


The exoplanet HD 118203 b, orbiting a bright (V = 8.05) host star, was discovered using the radial velocity method by da Silva et al., but was not previously known to transit. Transiting Exoplanet Survey Satellite (TESS) photometry has revealed that this planet transits its host star. Nine planetary transits were observed by TESS, allowing us to measure the radius of the planet to be 1.136-0.028 +0.029 R J, and to calculate the planet mass to be 2.166-0.079 +0.074 M J. The host star is slightly evolved with an effective temperature of T eff=5683-85 +84 K and a surface gravity of log\,g=3.889 0.018-0.017. With an orbital period of 6.134985-0.000030 +0.000029 days and an eccentricity of 0.314 ± 0.017, the planet occupies a transitional regime between circularized hot Jupiters and more dynamically active planets at longer orbital periods. The host star is among the 10 brightest known to have transiting giant planets, providing opportunities for both planetary atmospheric and asteroseismic studies.

Original languageEnglish (US)
Article number243
JournalAstronomical Journal
Issue number6
StatePublished - Jun 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • data behind figure


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