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23 April 2024

» arxiv » 2008.12397

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TKS III: A Stellar Obliquity Measurement of TOI-1726 c
Fei Dai ; Arpita Roy ; Benjamin Fulton ; Paul Robertson ; Lea Hirsch ; Howard Isaacson ; Simon Albrecht ; Andrew W. Mann ; Martti H. Kristiansen ; Natalie M. Batalha ; Corey Beard ; Aida Behmard ; Ashley Chontos ; Ian J. M. Crossfield ; Paul A. Dalba ; y Courtney Dressing ; Steven Giacalone ; Michelle Hill ; Andrew W. Howard ; Daniel Huber ; Stephen R. Kane ; Molly Kosiarek ; Jack Lubin ; Andrew Mayo ; Teo Mocnik ; Joseph M. Akana Murphy ; Erik A. Petigura ; Lee Rosenthal ; Ryan A. Rubenzahl ; Nicholas Scarsdale ; Lauren M. Weiss ; Judah Van Zandt ; George R. Ricker ; Roland Vanderspek ; David W. Latham ; Sara Seager ; Joshua N. Winn ; Jon M. Jenkins ; Douglas A. Caldwell ; David Charbonneau ; Tansu Daylan ; Maximilian N. Günther ; Edward Morgan ; Samuel N. Quinn ; Mark E. Rose ; Jeffrey C. Smith ;
Date:	28 Aug 2020
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.
Source:	arXiv, 2008.12397
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