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Winn, Judah Van Zandt, Kaz Gary, Konstantin Batygin, Lauren M. Weiss, Malena Rice, Michelle L. Hill, Molly R. Kosiarek, Natalie M. Batalha, Nicholas Scarsdale, Paul A. Dalba, Paul Robertson, Rae Holcomb, Ryan A. Rubenzahl, Sarah Blunt, S. Seager, Stephen R. Kane, Steven Giacalone, Teo Mocnik","submitted_at":"2021-08-04T18:00:02Z","abstract_excerpt":"Exoplanet systems with multiple transiting planets are natural laboratories for testing planetary astrophysics. One such system is HD 191939 (TOI-1339), a bright (V=9) and Sun-like (G9V) star, which TESS found to host three transiting planets (b, c, and d). The planets have periods of 9, 29, and 38 days each with similar sizes from 3 to 3.4 $R_{\\oplus}$. To further characterize the system, we measured the radial velocity (RV) of HD 191939 over 415 days with Keck/HIRES and APF/Levy. 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Polanski, Andrew Mayo, Andrew W. Howard, Arpita Roy, Ashley Chontos, Benjamin Fulton, Corey Beard, Courtney Dressing, Daniel Huber, David W. Latham, Erik A Petigura, Fei Dai, Howard Isaacson, Ian J. M. Crossfield, Jack Lubin, Joseph M. Akana Murphy, Joshua N. Winn, Judah Van Zandt, Kaz Gary, Konstantin Batygin, Lauren M. Weiss, Malena Rice, Michelle L. Hill, Molly R. Kosiarek, Natalie M. Batalha, Nicholas Scarsdale, Paul A. Dalba, Paul Robertson, Rae Holcomb, Ryan A. Rubenzahl, Sarah Blunt, S. Seager, Stephen R. Kane, Steven Giacalone, Teo Mocnik","submitted_at":"2021-08-04T18:00:02Z","abstract_excerpt":"Exoplanet systems with multiple transiting planets are natural laboratories for testing planetary astrophysics. One such system is HD 191939 (TOI-1339), a bright (V=9) and Sun-like (G9V) star, which TESS found to host three transiting planets (b, c, and d). The planets have periods of 9, 29, and 38 days each with similar sizes from 3 to 3.4 $R_{\\oplus}$. 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