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Caldwell, Edward Wiley, Elisa Quintana, Emily A. Gilbert, Eric Agol, Eric B. Ting, Eric G. Hintz, Eric L. N. Jensen, Ethan Kruse, Felipe Murgas, Gabor Furesz, George Ricker, Gongjie Li, Greg Olmschenk, Guillaume Hebrard, Guillermo Torres, Isabelle Boisse, Jack J. Lissauer, Jason Rowe, Jeffrey Herman, Jerome A. Orosz, Jessie Christiansen, Joe Ulowetz, John F. Kielkopf, Jon Jenkins, Joseph E. Rodriguez, Joshua N. Winn, Joshua Pepper, Joshua Schlieder, Karen A. Collins, Keivan G. Stassun, Kevin I. Collins, Knicole D. Colon, Lalitha Sairam, Laurance Doyle, Magali Deleuil, Matthew R. Standing, Matt Nelson, Michael B. Lund, Michael Endl, Michael Fausnaugh, Michael Richmond, Mitchell Yenawine, Nader Haghighipour, Nicholas M. Law, Pat Boyce, Pere Guerra, Phillip MacQueen, Pierre F. L. Maxted, Ravi Kopparapu, Richard C. Kidwell Jr., Richard P. Schwarz, Robert Buchheim, Robert F. Wilson, Robert Quimby, Roland Vanderspek, Samuel N. Quinn, Sara Seager, Scott Dixon, Sebastian Otero, Serge Bergeron, Stephen R. Kane, Steve Majewski, Thomas Barclay, Thomas G. Beatty, Tsevi Mazeh, Veselin B. Kostov, Ward S. Howard, William Cochran, William F. Welsh","submitted_at":"2021-05-18T15:47:01Z","abstract_excerpt":"We report the first discovery of a transiting circumbinary planet detected from a single sector of TESS data. During Sector 21, the planet TIC 172900988b transited the primary star and then 5 days later it transited the secondary star. The binary is itself eclipsing, with a period of P = 19.7 days and an eccentricity of e = 0.45. Archival data from ASAS-SN, Evryscope, KELT, and SuperWASP reveal a prominent apsidal motion of the binary orbit, caused by the dynamical interactions between the binary and the planet. 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