TIC 172900988: A Transiting Circumbinary Planet Detected in One Sector of TESS Data
Creators: name: Kostov, Veselin B.
name: Powell, Brian P.
name: Orosz, Jerome A.
name: Welsh, William F.
name: Cochran, William
name: Collins, Karen A.
name: Endl, Michael
name: Hellier, Coel
name: Latham, David W.
name: MacQueen, Phillip
name: Pepper, Joshua
name: Quarles, Billy
name: Sairam, Lalitha
name: Torres, Guillermo
name: Wilson, Robert F.
name: Bergeron, Serge
name: Boyce, Pat
name: Bieryla, Allyson
name: Buchheim, Robert
name: Christiansen, Caleb Ben
name: Ciardi, David R.
name: Collins, Kevin I.
name: Conti, Dennis M.
name: Dixon, Scott
name: Guerra, Pere
name: Haghighipour, Nader
name: Herman, Jeffrey
name: Hintz, Eric G.
name: Howard, Ward S.
name: Jensen, Eric L. N.
name: Kielkopf, John F.
name: Kruse, Ethan
name: Law, Nicholas M.
name: Martin, David
name: Maxted, Pierre F. L.
name: Montet, Benjamin T.
name: Murgas, Felipe
name: Nelson, Matt
name: Olmschenk, Greg
name: Otero, Sebastian
name: Quimby, Robert
name: Richmond, Michael
name: Schwarz, Richard P.
name: Shporer, Avi
name: Stassun, Keivan G.
name: Stephens, Denise C.
name: Triaud, Amaury H. M. J.
name: Ulowetz, Joe
name: Walter, Bradley S.
name: Wiley, Edward
name: Wood, David
name: Yenawine, Mitchell
name: Agol, Eric
name: Barclay, Thomas
name: Beatty, Thomas G.
name: Boisse, Isabelle
name: Caldwell, Douglas A.
name: Christiansen, Jessie
name: Colon, Knicole D.
name: Deleuil, Magali
name: Doyle, Laurance
name: Fabrycky, Daniel
name: Fausnaugh, Michael
name: Furesz, Gabor
name: Gilbert, Emily A.
name: Hebrard, Guillaume
name: James, David J.
name: Jenkins, Jon
name: Kane, Stephen R.
name: Kidwell, Richard C.
name: Kopparapu, Ravi
name: Li, Gongjie
name: Lissauer, Jack J.
name: Lund, Michael B.
name: Majewski, Steve
name: Mazeh, Tsevi
name: Quinn, Samuel N.
name: Quintana, Elisa
name: Ricker, George
name: Rodriguez, Joseph E.
name: Rowe, Jason
name: Santerne, Alexander
name: Schlieder, Joshua
name: Seager, Sara
name: Standing, Matthew R.
name: Stevens, Daniel J.
name: Ting, Eric B.
name: Vanderspek, Roland
name: Winn, Joshua N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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. A comprehensive photodynamical analysis of the TESS, archival and follow-up data yields stellar masses and radii of M1 = 1.2384 +/- 0.0007 MSun and R1 = 1.3827 +/- 0.0016 RSun for the primary and M2 = 1.2019 +/- 0.0007 MSun and R2 = 1.3124 +/- 0.0012 RSun for the secondary. The radius of the planet is R3 = 11.25 +/- 0.44 REarth (1.004 +/- 0.039 RJup). The planet's mass and orbital properties are not uniquely determined - there are six solutions with nearly equal likelihood. Specifically, we find that the planet's mass is in the range of 824 &lt; M3 &lt; 981 MEarth (2.65 &lt; M3 &lt; 3.09 MJup), its orbital period could be 188.8, 190.4, 194.0, 199.0, 200.4, or 204.1 days, and the eccentricity is between 0.02 and 0.09. At a V = 10.141 mag, the system is accessible for high-resolution spectroscopic observations, e.g. Rossiter-McLaughlin effect and transit spectroscopy.
description: 57 pages, 30 figures, 25 tables; Accepted AJ