The TESS-Keck Survey. XXII. A Sub-Neptune Orbiting TOI-1437

Creators: Pidhorodetska, Daria¹; Gilbert, Emily A.²; Kane, Stephen R.¹; Barclay, Thomas³; Polanski, Alex S.⁴; Hill, Michelle L.¹; Stassun, Keivan G.⁵; Giacalone, Steven⁶; Ciardi, David R.⁷; Boyle, Andrew W.⁶; Howell, Steve B.⁸; Lillo-Box, Jorge⁹; MacDougall, Mason G.¹⁰; Fetherolf, Tara^{1, 11}; Batalha, Natalie M.¹²; Crossfield, Ian J. M.⁴; Dressing, Courtney¹³; Fulton, Benjamin⁷; Howard, Andrew W.⁶; Huber, Daniel^{14, 15}; Isaacson, Howard^{13, 16}; Petigura, Erik A.¹⁰; Robertson, Paul¹⁷; Weiss, Lauren M.¹⁸; Angelo, Isabel¹⁰; Beard, Corey¹⁷; Behmard, Aida¹⁹; Blunt, Sarah²⁰; Brinkman, Casey L.¹⁴; Chontos, Ashley²¹; Dai, Fei^{6, 14}; Dalba, Paul A.¹²; Holcomb, Rae¹⁷; Lubin, Jack^{10, 17}; Mayo, Andrew W.¹³; Murphy, Joseph M. Akana¹²; Rice, Malena²²; Rubenzahl, Ryan⁶; Scarsdale, Nicholas¹²; Turtelboom, Emma V.¹³; Tyler, Dakotah¹⁰; Van Zandt, Judah¹⁰; Schwieterman, Edward W.¹

1. University of California, Riverside
2. Jet Propulsion Lab
3. Goddard Space Flight Center
4. University of Kansas
5. Vanderbilt University
6. California Institute of Technology
7. NASA Exoplanet Science Institute
8. Ames Research Center
9. Centro de Astrobiología
10. University of California, Los Angeles
11. California State University, San Marcos
12. University of California, Santa Cruz
13. University of California, Berkeley
14. University of Hawaii at Manoa
15. University of Sydney
16. University of Southern Queensland
17. University of California, Irvine
18. University of Notre Dame
19. American Museum of Natural History
20. Northwestern University
21. Princeton University
22. Yale University

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Abstract

Exoplanet discoveries have revealed a dramatic diversity of planet sizes across a vast array of orbital architectures. Sub-Neptunes are of particular interest; due to their absence in our own solar system, we rely on demographics of exoplanets to better understand their bulk composition and formation scenarios. Here, we present the discovery and characterization of TOI-1437 b, a sub-Neptune with a 18.84 day orbit around a near-solar analog (M_⋆ = 1.10 ± 0.10 M_☉, R_⋆=1.17 ± 0.12 R_☉). The planet was detected using photometric data from the Transiting Exoplanet Survey Satellite (TESS) mission and radial velocity (RV) follow-up observations were carried out as a part of the TESS-Keck Survey using both the HIRES instrument at Keck Observatory and the Levy Spectrograph on the Automated Planet Finder telescope. A combined analysis of these data reveal a planet radius of R_p = 2.24 ± 0.23 R_⊕ and a mass measurement of M_p = 9.6 ± 3.9 M_⊕). TOI-1437 b is one of few (∼50) known transiting sub-Neptunes orbiting a solar-mass star that has a RV mass measurement. As the formation pathway of these worlds remains an unanswered question, the precise mass characterization of TOI-1437 b may provide further insight into this class of planet.

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Acknowledgement

We thank the time assignment committees of the University of California, the California Institute of Technology, NASA, and the University of Hawaii for supporting the TESS-Keck Survey with observing time at Keck Observatory and on the Automated Planet Finder. We thank NASA for funding associated with our Key Strategic Mission Support project. We gratefully acknowledge the efforts and dedication of the Keck Observatory staff for support of HIRES and remote observing. We recognize and acknowledge the cultural role and reverence that the summit of Maunakea has within the indigenous Hawaiian community. We are deeply grateful to have the opportunity to conduct observations from this mountain. 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. This paper includes data collected by the TESS mission that are publicly available from the Mikulski Archive for Space Telescopes (MAST). Data was taken from the TESS Input Catalog (STScI 2018).

D.P. acknowledges support from the NASA FINESST Fellowship issued via grant No. 80NSSC22K1319.

M.L.H. would like to acknowledge NASA support via the FINESST Planetary Science Division, NASA award number 80NSSC21K1536.

D.R.C. acknowledges partial support from NASA grant 18-2XRP18_2-0007.

D.H. acknowledges support from the Alfred P. Sloan Foundation, the National Aeronautics and Space Administration (80NSSC21K0652) and the Australian Research Council (FT200100871).

J.L.-B. was partly funded by the Ramón y Cajal program with code RYC2021-031640-I. and by the Spanish MCIN/AEI/10.13039/501100011033 grant PID2019-107061GB-C61.

J.M.A.M. is supported by the National Science Foundation Graduate Research Fellowship Program under grant No. DGE-1842400.

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The TESS-Keck Survey. XXII. A Sub-Neptune Orbiting TOI-1437

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