HD 202772A b: A Transiting Hot Jupiter around a Bright, Mildly Evolved Star in a Visual Binary Discovered by TESS

February 2019 • 2019AJ....157...51W

Authors • Wang, Songhu • Jones, Matias • Shporer, Avi • Fulton, Benjamin J. • Paredes, Leonardo A. • Trifonov, Trifon • Kossakowski, Diana • Eastman, Jason • Redfield, Seth • Günther, Maximilian N. • Kreidberg, Laura • Huang, Chelsea X. • Millholland, Sarah • Seligman, Darryl • Fischer, Debra • Brahm, Rafael • Wang, Xian-Yu • Cruz, Bryndis • Henry, Todd • James, Hodari-Sadiki • Addison, Brett • Liang, En-Si • Davis, Allen B. • Tronsgaard, René • Worku, Keduse • Brewer, John M. • Kürster, Martin • Zhang, Hui • Beichman, Charles A. • Bieryla, Allyson • Brown, Timothy M. • Christiansen, Jessie L. • Ciardi, David R. • Collins, Karen A. • Esquerdo, Gilbert A. • Howard, Andrew W. • Isaacson, Howard • Latham, David W. • Mazeh, Tsevi • Petigura, Erik A. • Quinn, Samuel N. • Shahaf, Sahar • Siverd, Robert J. • Rodler, Florian • Reffert, Sabine • Zakhozhay, Olga • Ricker, George R. • Vanderspek, Roland • Seager, Sara • Winn, Joshua N. • Jenkins, Jon M. • Boyd, Patricia T. • Fűrész, Gábor • Henze, Christopher • Levine, Alen M. • Morris, Robert • Paegert, Martin • Stassun, Keivan G. • Ting, Eric B. • Vezie, Michael • Laughlin, Gregory

Abstract • We report the first confirmation of a hot Jupiter discovered by the Transiting Exoplanet Survey Satellite (TESS) mission: HD 202772A b. The transit signal was detected in the data from TESS Sector 1, and was confirmed to be of planetary origin through radial velocity (RV) measurements. HD 202772A b is orbiting a mildly evolved star with a period of 3.3 days. With an apparent magnitude of V = 8.3, the star is among the brightest and most massive known to host a hot Jupiter. Based on the 27 days of TESS photometry and RV data from the CHIRON, HARPS, and Tillinghast Reflector Echelle Spectrograph, the planet has a mass of {1.017}-0.068+0.070 {M}{{J}} and radius of {1.545}-0.060+0.052 {R}{{J}}, making it an inflated gas giant. HD 202772A b is a rare example of a transiting hot Jupiter around a quickly evolving star. It is also one of the most strongly irradiated hot Jupiters currently known.


IPAC Authors


Jessie Christiansen

Associate Scientist


David Ciardi

Senior Scientist


Benjamin Fulton

Assistant Scientist