Near-resonance in a System of Sub-Neptunes from TESS

Quinn, Samuel N.; Becker, Juliette C.; Rodriguez, Joseph E.; Hadden, Sam; Huang, Chelsea X.; Morton, Timothy D.; Adams, Fred C.; Armstrong, David; Eastman, Jason D.; Horner, Jonathan; Kane, Stephen R.; Lissauer, Jack J.; Twicken, Joseph D.; Vanderburg, Andrew; Wittenmyer, Rob; Ricker, George R.; Vanderspek, Roland K.; Latham, David W.; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Agol, Eric; Barkaoui, Khalid; Beichman, Charles A.; Bouchy, François; Bouma, L. G.; Burdanov, Artem; Campbell, Jennifer; Carlino, Roberto; Cartwright, Scott M.; Charbonneau, David; Christiansen, Jessie L.; Ciardi, David; Collins, Karen A.; Collins, Kevin I.; Conti, Dennis M.; Crossfield, Ian J. M.; Daylan, Tansu; Dittmann, Jason; Doty, John; Dragomir, Diana; Ducrot, Elsa; Gillon, Michael; Glidden, Ana; Goeke, Robert F.; Gonzales, Erica J.; Hełminiak, Krzysztof G.; Horch, Elliott P.; Howell, Steve B.; Jehin, Emmanuel; Jensen, Eric L. N.; Kielkopf, John F.; Kristiansen, Martti H.; Law, Nicholas; Mann, Andrew W.; Marmier, Maxime; Matson, Rachel A.; Matthews, Elisabeth; Mazeh, Tsevi; Mori, Mayuko; Murgas, Felipe; Murray, Catriona; Narita, Norio; Nielsen, Louise D.; Ottoni, Gaël; Palle, Enric; Pawłaszek, Rafał; Pepe, Francesco; Pitogo de Leon, Jerome; Pozuelos, Francisco J.; Relles, Howard M.; Schlieder, Joshua E.; Sebastian, Daniel; Ségransan, Damien; Shporer, Avi; Stassun, Keivan G.; Tamura, Motohide; Udry, Stéphane; Waite, Ian; Winters, Jennifer G.; Ziegler, Carl
Bibliographical reference

The Astronomical Journal

Advertised on:
11
2019
Description
We report the Transiting Exoplanet Survey Satellite detection of a multi-planet system orbiting the V = 10.9 K0 dwarf TOI-125. We find evidence for up to five planets, with varying confidence. Three transit signals with high signal-to-noise ratio correspond to sub-Neptune-sized planets (2.76, 2.79, and 2.94 R ⊕), and we statistically validate the planetary nature of the two inner planets (P b = 4.65 days, P c = 9.15 days). With only two transits observed, we report the outer object (P .03 = 19.98 days) as a planet candidate with high signal-to-noise ratio. We also detect a candidate transiting super-Earth (1.4 R ⊕) with an orbital period of only 12.7 hr and a candidate Neptune-sized planet (4.2 R ⊕) with a period of 13.28 days, both at low signal-to-noise ratio. This system is amenable to mass determination via radial velocities and transit-timing variations, and provides an opportunity to study planets of similar size while controlling for age and environment. The ratio of orbital periods between TOI-125 b and c (P c /P b = 1.97) is slightly lower than an exact 2:1 commensurability and is atypical of multiple planet systems from Kepler, which show a preference for period ratios just wide of first-order period ratios. A dynamical analysis refines the allowed parameter space through stability arguments and suggests that despite the nearly commensurate periods, the system is unlikely to be in resonance.
Related projects
Projects' name image
Exoplanets and Astrobiology

The search for life in the universe has been driven by recent discoveries of planets around other stars (known as exoplanets), becoming one of the most active fields in modern astrophysics. The growing number of new exoplanets discovered in recent years and the recent advance on the study of their atmospheres are not only providing new valuable

Enric
Pallé Bago
Projects' name image
Exoplanets and Astrobiology

The search for life in the universe has been driven by recent discoveries of planets around other stars (known as exoplanets), becoming one of the most active fields in modern astrophysics. The growing number of new exoplanets discovered in recent years and the recent advance on the study of their atmospheres are not only providing new valuable

Enric
Pallé Bago