The Astronomical Journal (Jan 2024)
The TESS-Keck Survey. XVIII. A Sub-Neptune and Spurious Long-period Signal in the TOI-1751 System
- Anmol Desai,
- Emma V. Turtelboom,
- Caleb K. Harada,
- Courtney D. Dressing,
- David R. Rice,
- Joseph M. Akana Murphy,
- Casey L. Brinkman,
- Ashley Chontos,
- Ian J. M. Crossfield,
- Fei Dai,
- Michelle L. Hill,
- Tara Fetherolf,
- Steven Giacalone,
- Andrew W. Howard,
- Daniel Huber,
- Howard Isaacson,
- Stephen R. Kane,
- Jack Lubin,
- Mason G. MacDougall,
- Andrew W. Mayo,
- Teo Močnik,
- Alex S. Polanski,
- Malena Rice,
- Paul Robertson,
- Ryan A. Rubenzahl,
- Judah Van Zandt,
- Lauren M. Weiss,
- Allyson Bieryla,
- Lars A. Buchhave,
- Jon M. Jenkins,
- Veselin B. Kostov,
- Alan M. Levine,
- Jorge Lillo-Box,
- M. Paegert,
- Markus Rabus,
- S. Seager,
- Keivan G. Stassun,
- Eric B. Ting,
- David Watanabe,
- Joshua N. Winn
Affiliations
- Anmol Desai
- ORCiD
- Department of Astronomy, 501 Campbell Hall, University of California , Berkeley, CA 94720, USA ; [email protected]
- Emma V. Turtelboom
- ORCiD
- Department of Astronomy, 501 Campbell Hall, University of California , Berkeley, CA 94720, USA ; [email protected]
- Caleb K. Harada
- ORCiD
- Department of Astronomy, 501 Campbell Hall, University of California , Berkeley, CA 94720, USA ; [email protected]
- Courtney D. Dressing
- ORCiD
- Department of Astronomy, 501 Campbell Hall, University of California , Berkeley, CA 94720, USA ; [email protected]
- David R. Rice
- ORCiD
- Astrophysics Research Center, Department of Natural Sciences, The Open University of Israel , Raanana 4353701, Israel
- Joseph M. Akana Murphy
- ORCiD
- Department of Astronomy and Astrophysics, University of California , Santa Cruz, CA 95064, USA
- Casey L. Brinkman
- ORCiD
- Institute for Astronomy, University of Hawai‘i , 2680 Woodlawn Drive, Honolulu, HI 96822, USA
- Ashley Chontos
- ORCiD
- Department of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08540, USA
- Ian J. M. Crossfield
- Department of Physics and Astronomy, University of Kansas , Lawrence, KS, USA
- Fei Dai
- ORCiD
- Division of Geological and Planetary Sciences , 1200 E California Boulevard, Pasadena, CA 91125, USA; Department of Astronomy, California Institute of Technology , Pasadena, CA 91125, USA
- Michelle L. Hill
- ORCiD
- Department of Earth and Planetary Sciences, University of California , Riverside, CA 92521, USA
- Tara Fetherolf
- ORCiD
- Department of Earth and Planetary Sciences, University of California , Riverside, CA 92521, USA; Department of Physics, California State University , San Marcos, CA 92096, USA
- Steven Giacalone
- ORCiD
- Department of Astronomy, California Institute of Technology , Pasadena, CA 91125, USA
- Andrew W. Howard
- ORCiD
- Cahill Center for Astronomy & Astrophysics, California Institute of Technology , Pasadena, CA 91125, USA
- Daniel Huber
- ORCiD
- Institute for Astronomy, University of Hawai‘i , 2680 Woodlawn Drive, Honolulu, HI 96822, USA; Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney , NSW 2006, Australia
- Howard Isaacson
- ORCiD
- Department of Astronomy, 501 Campbell Hall, University of California , Berkeley, CA 94720, USA ; [email protected]; Centre for Astrophysics, University of Southern Queensland , Toowoomba, QLD, Australia
- Stephen R. Kane
- ORCiD
- Department of Earth and Planetary Sciences, University of California , Riverside, CA 92521, USA
- Jack Lubin
- ORCiD
- Department of Physics & Astronomy, University of California Irvine , Irvine, CA 92697, USA
- Mason G. MacDougall
- ORCiD
- Department of Physics & Astronomy, University of California Los Angeles , Los Angeles, CA 90095, USA
- Andrew W. Mayo
- ORCiD
- Department of Astronomy, 501 Campbell Hall, University of California , Berkeley, CA 94720, USA ; [email protected]; Centre for Star and Planet Formation, Natural History Museum of Denmark & Niels Bohr Institute, University of Copenhagen , Øster Voldgade 5-7, DK-1350 Copenhagen K., Denmark
- Teo Močnik
- ORCiD
- Gemini Observatory/NSF’s NOIRLab , 670 N. A’ohoku Place, Hilo, HI 96720, USA
- Alex S. Polanski
- ORCiD
- Department of Physics and Astronomy, University of Kansas , Lawrence, KS, USA
- Malena Rice
- ORCiD
- Department of Astronomy, Yale University , New Haven, CT 06511, USA
- Paul Robertson
- ORCiD
- Department of Physics & Astronomy, University of California Irvine , Irvine, CA 92697, USA
- Ryan A. Rubenzahl
- ORCiD
- Department of Astronomy, California Institute of Technology , Pasadena, CA 91125, USA
- Judah Van Zandt
- ORCiD
- Department of Physics & Astronomy, University of California Los Angeles , Los Angeles, CA 90095, USA
- Lauren M. Weiss
- ORCiD
- Department of Physics and Astronomy, University of Notre Dame , Notre Dame, IN 46556, USA
- Allyson Bieryla
- ORCiD
- Center for Astrophysics ∣Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Lars A. Buchhave
- ORCiD
- DTU Space, Technical University of Denmark , Elektrovej 328, DK-2800 Kgs. Lyngby, Denmark
- Jon M. Jenkins
- ORCiD
- NASA Ames Research Center , Moffett Field, CA 94035, USA
- Veselin B. Kostov
- ORCiD
- NASA Goddard Space Flight Center , 8800 Greenbelt Road, Greenbelt, MD 20771, USA; SETI Institute , 189 Bernardo Avenue, Suite 200, Mountain View, CA 94043, USA
- Alan M. Levine
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Jorge Lillo-Box
- ORCiD
- Centro de Astrobiología (CAB) , CSIC-INTA, Depto. de Astrofísica, ESAC campus, 28692, Villanueva de la Cañada (Madrid), Spain
- M. Paegert
- ORCiD
- Center for Astrophysics ∣Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Markus Rabus
- ORCiD
- Departamento de Matemática y Física Aplicadas, Facultad de Ingeniería, Universidad Católica de la Santísima Concepción , Alonso de Rivera 2850, Concepción, Chile
- S. Seager
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology , Cambridge, MA 02139, USA; Department of Aeronautics and Astronautics , MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
- Keivan G. Stassun
- ORCiD
- Department of Physics and Astronomy, Vanderbilt University , Nashville, TN 37235, USA
- Eric B. Ting
- ORCiD
- NASA Ames Research Center , Moffett Field, CA 94035, USA
- David Watanabe
- ORCiD
- Planetary Discoveries , 28935 Via Adelena, Santa Clarita, CA 91354, USA
- Joshua N. Winn
- ORCiD
- Department of Astrophysical Sciences, Princeton University , Princeton, NJ 08544, USA
- DOI
- https://doi.org/10.3847/1538-3881/ad29ee
- Journal volume & issue
-
Vol. 167,
no. 5
p. 194
Abstract
We present and confirm TOI-1751 b, a transiting sub-Neptune orbiting a slightly evolved, solar-type, metal-poor star ( T _eff = 5996 ± 110 K, $\mathrm{log}(g)=4.2\pm 0.1$ , V = 9.3 mag, [Fe/H] = −0.40 ± 0.06 dex) every 37.47 days. We use TESS photometry to measure a planet radius of ${2.77}_{-0.07}^{+0.15}\,{R}_{\oplus }$ . We also use both Keck/HIRES and APF/Levy radial velocities (RV) to derive a planet mass of ${14.5}_{-3.14}^{+3.15}\,{M}_{\oplus }$ , and thus a planet density of 3.6 ± 0.9 g cm ^−3 . There is also a long-period (∼400 days) signal that is observed in only the Keck/HIRES data. We conclude that this long-period signal is not planetary in nature and is likely due to the window function of the Keck/HIRES observations. This highlights the role of complementary observations from multiple observatories to identify and exclude aliases in RV data. Finally, we investigate the potential compositions of this planet, including rocky and water-rich solutions, as well as theoretical irradiated ocean models. TOI-1751 b is a warm sub-Neptune with an equilibrium temperature of ∼820 K. As TOI-1751 is a metal-poor star, TOI-1751 b may have formed in a water-enriched formation environment. We thus favor a volatile-rich interior composition for this planet.
Keywords
