TOI-5126: a hot super-Neptune and warm Neptune pair discovered by TESS and CHEOPS

Author:

Fairnington Tyler R1ORCID,Nabbie Emma1,Huang Chelsea X1,Zhou George1,Foo Orion2,Millholland Sarah2,Wright Duncan1,Belinski Alexandre A3,Bieryla Allyson4ORCID,Ciardi David R5,Collins Karen A4,Collins Kevin I6,Everett Mark7,Howell Steve B8,Lissauer Jack J8,Lund Michael B5,Murgas Felipe910,Palle Enric910,Quinn Samuel N4,Relles Howard M4,Safonov Boris S3,Schwarz Richard P4,Scott Nicholas J8,Srdoc Gregor11,Ricker George2,Vanderspek Roland2,Seager Sara21213,Latham David W4,Winn Joshua W14,Jenkins Jon M8,Bouma Luke G15ORCID,Shporer Avi2,Ting Eric B8,Dragomir Diana16ORCID,Kunimoto Michelle2,Eisner Nora L1517

Affiliation:

1. Centre for Astrophysics, University of Southern Queensland , West St, Darling Heights, Toowoomba, Queensland 4350 , Australia

2. Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , 77 Massachusetts Ave, Cambridge, MA 02139 , USA

3. Sternberg Astronomical Institute, Lomonosov Moscow State University, Universitetskii prospekt 13, 119992 , Moscow , Russia

4. Center for Astrophysics|Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138 , USA

5. NASA Exoplanet Science Institute - Caltech/IPAC , 1200 E. California Blvd, Pasadena, CA 91125 , USA

6. George Mason University , 4400 University Drive, Fairfax, VA 22030 , USA

7. NSF’s National Optical-Infrared Astronomy Research Laboratory , 950 N. Cherry Avenue, Tucson, AZ 85719 , USA

8. NASA Ames Research Center , Moffett Field, CA 94035 , USA

9. Instituto de Astrofísica de Canarias (IAC) , E-38205 La Laguna, Tenerife , Spain

10. Departamento de Astrofísica, Universidad de La Laguna (ULL) , E-38206 La Laguna, Tenerife , Spain

11. Kotizarovci Observatory , Sarsoni 90, 51216 Viskovo , Croatia

12. Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology , Cambridge, MA 02139 , USA

13. Department of Aeronautics and Astronautics, Massachusetts Institute of Technology , Cambridge, MA 02139 , USA

14. Department of Astrophysical Sciences, Princeton University , Princeton, NJ 08544 , USA

15. Department of Astronomy , California Institute of Technology, MC 249-17, Pasadena, CA 91125 , USA

16. Department of Physics and Astronomy, University of New Mexico , 210 Yale Blvd NE, Albuquerque, NM 87106 , USA

17. Center for Computational Astrophysics, Flatiron Institute , 162 5th Ave New York, NY 10010 , USA

Abstract

ABSTRACT We present the confirmation of a hot super-Neptune with an exterior Neptune companion orbiting a bright (V  = 10.1 mag) F-dwarf identified by the Transiting Exoplanet Survey Satellite (TESS). The two planets, observed in sectors 45, 46, and 48 of the TESS extended mission, are $4.74_{-0.14}^{+0.16}$ and $3.86_{-0.16}^{+0.17}$ R⊕ with $5.4588385_{-0.0000072}^{+0.0000070}$ and $17.8999_{-0.0013}^{+0.0018}$ d orbital periods, respectively. We also obtained precise space-based photometric follow-up of the system with ESA’s CHaracterising ExOplanets Satellite to constrain the radius and ephemeris of TOI-5126 b. TOI-5126 b is located in the ‘hot Neptune Desert’ and is an ideal candidate for follow-up transmission spectroscopy due to its high-predicted equilibrium temperature (Teq = ${1442}_{-40}^{+46}$ K) implying a cloud-free atmosphere. TOI-5126 c is a warm Neptune (Teq = $971_{-27}^{+31}$ K) also suitable for follow-up. Tentative transit timing variations have also been identified in analysis, suggesting the presence of at least one additional planet, however this signal may be caused by spot-crossing events, necessitating further precise photometric follow-up to confirm these signals.

Funder

ARC

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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