Bibcode
Korth, Judith; Chaturvedi, Priyanka; Parviainen, Hannu; Carleo, Ilaria; Endl, Michael; Guenther, Eike W.; Nowak, Grzegorz; Persson, Carina M.; MacQueen, Phillip J.; Mustill, Alexander J.; Cabrera, Juan; Cochran, William D.; Lillo-Box, Jorge; Hobbs, David; Murgas, Felipe; Greklek-McKeon, Michael; Kellermann, Hanna; Hébrard, Guillaume; Fukui, Akihiko; Pallé, Enric; Jenkins, Jon M.; Twicken, Joseph D.; Collins, Karen A.; Quinn, Samuel N.; Šubjak, Ján; Beck, Paul G.; Gandolfi, Davide; Mathur, Savita; Deeg, Hans J.; Latham, David W.; Albrecht, Simon; Barrado, David; Boisse, Isabelle; Bouy, Hervé; Delfosse, Xavier; Demangeon, Olivier; García, Rafael A.; Hatzes, Artie P.; Heidari, Neda; Ikuta, Kai; Kabáth, Petr; Knutson, Heather A.; Livingston, John; Martioli, Eder; Morales-Calderón, María; Morello, Giuseppe; Narita, Norio; Orell-Miquel, Jaume; Osborne, Hanna L. M.; Palakkatharappil, Dinil B.; Pinter, Viktoria; Redfield, Seth; Relles, Howard M.; Schwarz, Richard P.; Seager, Sara; Shporer, Avi; Skarka, Marek; Srdoc, Gregor; Stangret, Monika; Thomas, Luis; Van Eylen, Vincent; Watanabe, Noriharu; Winn, Joshua N.
Referencia bibliográfica
The Astrophysical Journal
Advertised on:
8
2024
Revista
Número de citas
0
Número de citas referidas
0
Descripción
We report the discovery and characterization of a small planet, TOI-1408 c, on a 2.2 day orbit located interior to a previously known hot Jupiter, TOI-1408 b (P = 4.42 days, M = 1.86 ± 0.02 M Jup, R = 2.4 ± 0.5 R Jup) that exhibits grazing transits. The two planets are near 2:1 period commensurability, resulting in significant transit timing variations (TTVs) for both planets and transit duration variations for the inner planet. The TTV amplitude for TOI-1408 c is 15% of the planet's orbital period, marking the largest TTV amplitude relative to the orbital period measured to date. Photodynamical modeling of ground-based radial velocity (RV) observations and transit light curves obtained with the Transiting Exoplanet Survey Satellite and ground-based facilities leads to an inner planet radius of 2.22 ± 0.06 R ⊕ and mass of 7.6 ± 0.2 M ⊕ that locates the planet into the sub-Neptune regime. The proximity to the 2:1 period commensurability leads to the libration of the resonant argument of the inner planet. The RV measurements support the existence of a third body with an orbital period of several thousand days. This discovery places the system among the rare systems featuring a hot Jupiter accompanied by an inner low-mass planet.