The TESS-keck survey. III: A stellar obliquity measurement of TOI-1726 c

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  • Fei Dai, California Institute of Technology
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  • Arpita Roy, California Institute of Technology
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  • Benjamin Fulton, National Aeronautics and Space Administration
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  • Paul Robertson, University of California at Irvine
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  • Lea Hirsch, Stanford University
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  • Howard Isaacson, University of California at Berkeley
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  • Simon Albrecht
  • Andrew W. Mann, University of North Carolina
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  • Martti H. Kristiansen, Brorfelde Observatory, Danmarks Tekniske Universitet
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  • Natalie M. Batalha, University of California at Santa Cruz
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  • Corey Beard, University of California at Irvine
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  • Aida Behmard, California Institute of Technology
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  • Ashley Chontos, University of Hawaii at Manoa
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  • Ian J.M. Crossfield, University of Kansas
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  • Paul A. Dalba, University of California at Riverside
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  • Courtney Dressing, University of California at Berkeley
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  • Steven Giacalone, University of California at Berkeley
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  • Michelle Hill, University of California at Riverside
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  • Andrew W. Howard, California Institute of Technology
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  • Daniel Huber, Institute for Astronomy, University of Hawaii at Manoa
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  • Stephen R. Kane, University of California at Riverside
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  • Molly Kosiarek, University of California at Santa Cruz
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  • Jack Lubin, University of California at Irvine
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  • Andrew Mayo, University of California at Berkeley
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  • Teo Mocnik, Gemini Observatory
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  • Joseph M. Akana Murphy, University of California at Santa Cruz
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  • Erik A. Petigura, University of California at Los Angeles
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  • Lee Rosenthal, California Institute of Technology
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  • Ryan A. Rubenzahl, California Institute of Technology
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  • Nicholas Scarsdale, University of California at Santa Cruz
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  • Lauren M. Weiss, University of Hawaii at Manoa
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  • Judah van Zandt, University of California at Los Angeles
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  • George R. Ricker, Massachusetts Institute of Technology
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  • Roland Vanderspek, Massachusetts Institute of Technology
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  • David W. Latham, Harvard University
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  • Sara Seager, Massachusetts Institute of Technology
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  • Joshua N. Winn, Princeton University
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  • Jon M. Jenkins, NASA Ames Research Center
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  • Douglas A. Caldwell, NASA Ames Research Center, SETI Institute
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  • David Charbonneau, Harvard University
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  • Tansu Daylan, Massachusetts Institute of Technology
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  • Maximilian N. Günther, Massachusetts Institute of Technology
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  • Edward Morgan, Massachusetts Institute of Technology
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  • Samuel N. Quinn, Harvard University
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  • Mark E. Rose, NASA Ames Research Center
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  • Jeffrey C. Smith, NASA Ames Research Center, SETI Institute

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.

OriginalsprogEngelsk
Artikelnummerabb3bd
TidsskriftAstronomical Journal
Vol/bind160
Nummer4
Antal sider8
ISSN0004-6256
DOI
StatusUdgivet - okt. 2020

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