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The TESS-Keck Survey. III. A Stellar Obliquity Measurement of TOI-1726 c
- 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 JM;
- Dalba, Paul A;
- Dressing, 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
Abstract
We report the measurement of a spectroscopic transit of TOI-1726c, one of two planets transiting a G-type star with V = 6.9 in the Ursa Major Moving Group (∼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-+3235∘. 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 multitransiting 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☉ and c 2.7 R☉ both likely underwent photoevaporation). The coplanar geometry points to a dynamically cold history of the system that simplifies any future modeling of atmospheric escape.
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