학술논문
TKS III: A Stellar Obliquity Measurement of TOI-1726 c
Document Type
Working Paper
Author
Dai, Fei; Roy, Arpita; Fulton, Benjamin; Robertson, Paul; Hirsch, Lea; Isaacson, Howard; Albrecht, Simon; Mann, Andrew W.; Kristiansen, Martti H.; Batalha, Natalie M.; Beard, Corey; Behmard, Aida; Chontos, Ashley; Crossfield, Ian J. M.; Dalba, Paul A.; Dressing, y Courtney; Giacalone, Steven; Hill, Michelle; Howard, Andrew W.; Huber, Daniel; Kane, Stephen R.; Kosiarek, Molly; Lubin, Jack; Mayo, Andrew; Mocnik, Teo; Murphy, Joseph M. Akana; Petigura, Erik A.; Rosenthal, Lee; Rubenzahl, Ryan A.; Scarsdale, Nicholas; Weiss, Lauren M.; Van Zandt, Judah; Ricker, George R.; Vanderspek, Roland; Latham, David W.; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Caldwell, Douglas A.; Charbonneau, David; Daylan, Tansu; Günther, Maximilian N.; Morgan, Edward; Quinn, Samuel N.; Rose, Mark E.; Smith, Jeffrey C.
Source
Subject
Language
Abstract
We report the measurement of a spectroscopic transit of TOI-1726 c, one of two planets transiting a G-type star with $V$ = 6.9 in the Ursa Major Moving Group ($\sim$400 Myr). With a precise age constraint from cluster membership, TOI-1726 provides a great opportunity to test various obliquity excitation scenarios that operate on different timescales. By modeling the Rossiter-McLaughlin (RM) effect, we derived a sky-projected obliquity of $-1^{+35}_{-32}~^{\circ}$. This result rules out a polar/retrograde orbit; and is consistent with an aligned orbit for planet c. Considering the previously reported, similarly prograde RM measurement of planet b and the transiting nature of both planets, TOI-1726 tentatively conforms to the overall picture that compact multi-transiting planetary systems tend to have coplanar, likely aligned orbits. TOI-1726 is also a great atmospheric target for understanding differential atmospheric loss of sub-Neptune planets (planet b 2.2 $R_\oplus$ and c 2.7 $R_\oplus$ both likely underwent photoevaporation). The coplanar geometry points to a dynamically cold history of the system that simplifies any future modeling of atmospheric escape.
Comment: Accepted to AJ
Comment: Accepted to AJ