A Caltech Library Service

The TESS-Keck Survey. III. A Stellar Obliquity Measurement of TOI-1726 c

Dai, Fei and Roy, Arpita and Fulton, Benjamin and Robertson, Paul and Hirsch, Lea and Isaacson, Howard and Albrecht, Simon and Mann, Andrew W. and Kristiansen, Martti H. and Batalha, Natalie M. and Beard, Corey and Behmard, Aida and Chontos, Ashley and Crossfield, Ian J. M. and Dalba, Paul A. and Dressing, Courtney and Giacalone, Steven and Hill, Michelle and Howard, Andrew W. and Huber, Daniel and Kane, Stephen R. and Kosiarek, Molly R. and Lubin, Jack and Mayo, Andrew and Mocnik, Teo and Murphy, Joseph M. Akana and Petigura, Erik A. and Rosenthal, Lee and Rubenzahl, Ryan A. and Scarsdale, Nicholas and Weiss, Lauren M. and Van Zandt, Judah and Ricker, George R. and Vanderspek, Roland and Latham, David W. and Seager, Sara and Winn, Joshua N. and Jenkins, Jon M. and Caldwell, Douglas A. and Charbonneau, David and Daylan, Tansu and Günther, Maximilian N. and Morgan, Edward and Quinn, Samuel N. and Rose, Mark E. and Smith, Jeffrey C. (2020) The TESS-Keck Survey. III. A Stellar Obliquity Measurement of TOI-1726 c. Astronomical Journal, 160 (4). Art. No. 193. ISSN 1538-3881. doi:10.3847/1538-3881/abb3bd.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


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^(+35)_(−32)∘. 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Dai, Fei0000-0002-8958-0683
Roy, Arpita0000-0001-8127-5775
Fulton, Benjamin0000-0003-3504-5316
Robertson, Paul0000-0003-0149-9678
Hirsch, Lea0000-0001-8058-7443
Isaacson, Howard0000-0002-0531-1073
Albrecht, Simon0000-0003-1762-8235
Mann, Andrew W.0000-0003-3654-1602
Kristiansen, Martti H.0000-0002-2607-138X
Batalha, Natalie M.0000-0002-7030-9519
Beard, Corey0000-0001-7708-2364
Behmard, Aida0000-0003-0012-9093
Chontos, Ashley0000-0003-1125-2564
Crossfield, Ian J. M.0000-0002-1835-1891
Dalba, Paul A.0000-0002-4297-5506
Dressing, Courtney0000-0001-8189-0233
Giacalone, Steven0000-0002-8965-3969
Hill, Michelle0000-0002-0139-4756
Howard, Andrew W.0000-0001-8638-0320
Huber, Daniel0000-0001-8832-4488
Kane, Stephen R.0000-0002-7084-0529
Kosiarek, Molly R.0000-0002-6115-4359
Lubin, Jack0000-0001-8342-7736
Mayo, Andrew0000-0002-7216-2135
Mocnik, Teo0000-0003-4603-556X
Murphy, Joseph M. Akana0000-0001-8898-8284
Petigura, Erik A.0000-0003-0967-2893
Rosenthal, Lee0000-0001-8391-5182
Rubenzahl, Ryan A.0000-0003-3856-3143
Scarsdale, Nicholas0000-0003-3623-7280
Weiss, Lauren M.0000-0002-3725-3058
Van Zandt, Judah0000-0002-4290-6826
Ricker, George R.0000-0003-2058-6662
Vanderspek, Roland0000-0001-6763-6562
Latham, David W.0000-0001-9911-7388
Seager, Sara0000-0002-6892-6948
Winn, Joshua N.0000-0002-4265-047X
Jenkins, Jon M.0000-0002-4715-9460
Caldwell, Douglas A.0000-0003-1963-9616
Charbonneau, David0000-0002-9003-484X
Daylan, Tansu0000-0002-6939-9211
Günther, Maximilian N.0000-0002-3164-9086
Morgan, Edward0000-0003-1447-6344
Quinn, Samuel N.0000-0002-8964-8377
Rose, Mark E.0000-0003-4724-745X
Alternate Title:TKS III: A Stellar Obliquity Measurement of TOI-1726 c
Additional Information:© 2020 The American Astronomical Society. Received 2020 May 6; revised 2020 August 19; accepted 2020 August 27; published 2020 September 30. We thank the time assignment committee of the University of California for observing time on the Automated Planet Finder for the TESS-Keck Survey. We thank NASA for funding associated with our Key Strategic Mission Support project for TESS–Keck–Survey. We thank Ken and Gloria Levy, who supported the construction of the Levy Spectrometer on the Automated Planet Finder. We thank the University of California and Google for supporting Lick Observatory and the UCO staff for their dedicated work scheduling and operating the telescopes of Lick Observatory. This paper is based on data collected by the TESS mission. Funding for the TESS mission is provided by the NASA Explorer Program. T.D. acknowledges support from MIT's Kavli Institute as a Kavli postdoctoral fellow. M.N.G. acknowledges support from MIT's Kavli Institute as a Torres postdoctoral fellow. P.D. acknowledges support from a National Science Foundation Astronomy and Astrophysics Postdoctoral Fellowship under award AST-1903811. J.M.A.M. gratefully acknowledges support from the National Science Foundation Graduate Research Fellowship under grant No. DGE-1842400. J.M.A.M. also thanks the LSSTC Data Science Fellowship Program, which is funded by LSSTC, NSF Cybertraining grant No. 1829740, the Brinson Foundation, and the Moore Foundation; his participation in the program has benefited this work. M.H.K. acknowledges Allan R. Schmitt for making his light curve examining software LcTools freely available. D.C. was supported by a grant from the John Templeton Foundation. The opinions expressed in this publication are those of the authors and do not necessarily reflect the views of the John Templeton Foundation. S.A. acknowledges the support from the Danish Council for Independent Research through the DFF Sapere Aude Starting grant No. 4181-00487B, and the Stellar Astrophysics Centre which funding is provided by The Danish National Research Foundation (grant agreement No.: DNRF106). Facilities: Automated Planet Finder (Levy) - , TESS. - Software: Batman (Kreidberg 2015), Emcee (Foreman-Mackey et al. 2013), EXOFAST (Eastman et al. 2013), Isoclassify (Huber 2017), lmfit(Newville et al. 2014) SpecMatch (Petigura 2015; Yee et al. 2017).
Group:Astronomy Department, Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Ken and Gloria LevyUNSPECIFIED
University of CaliforniaUNSPECIFIED
Massachusetts Institute of Technology (MIT)UNSPECIFIED
Kavli FoundationUNSPECIFIED
NSF Astronomy and Astrophysics FellowshipAST-1903811
NSF Graduate Research FellowshipDGE-1842400
LSSTC Institutional MembersUNSPECIFIED
Brinson FoundationUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
John Templeton FoundationUNSPECIFIED
Danish Council for Independent Research4181-00487B
Danish National Research FoundationDNRF106
Subject Keywords:Exoplanet dynamics ; Exoplanet formation
Issue or Number:4
Classification Code:Unified Astronomy Thesaurus concepts: Exoplanet dynamics (490); Exoplanet formation (492)
Record Number:CaltechAUTHORS:20200916-112854779
Persistent URL:
Official Citation:Fei Dai et al 2020 AJ 160 193
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105413
Deposited By: George Porter
Deposited On:23 Sep 2020 14:09
Last Modified:16 Nov 2021 18:42

Repository Staff Only: item control page