Discovery and characterization of two Neptune-mass planets orbiting HD 212729 with <i>TESS</i>-Reference-Cited by-同舟云学术

Discovery and characterization of two Neptune-mass planets orbiting HD 212729 with TESS

Published:2023-07-20 Issue:4 Volume:524 Page:5804-5816
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

Armstrong David J¹²^ORCID,Osborn Ares¹²^ORCID,Adibekyan Vardan³,Delgado-Mena Elisa³,Hojjatpanah Saeed⁴,Howell Steve B⁵,Hoyer Sergio⁴^ORCID,Knierim Henrik⁶,Sousa Sérgio G³^ORCID,Stassun Keivan G⁷^ORCID,Veras Dimitri¹²⁸^ORCID,Anderson David R¹²,Bayliss Daniel¹²,Bouchy François⁹,Burke Christopher J¹⁰,Christiansen Jessie L¹¹,Dumusque Xavier⁹,Keniger Marcelo Aron Fetzner¹²,Hadjigeorghiou Andreas¹²,Hawthorn Faith¹²,Helled Ravit⁶,Jenkins Jon M⁵,Latham David W¹²,Lillo-Box Jorge¹³,Nielsen Louise D¹⁴,Osborn Hugh P¹⁵,Rodrigues José³,Rodriguez David¹⁶,Santos Nuno C³¹⁷,Seager Sara¹⁰¹⁸¹⁹,Strøm Paul A¹²,Torres Guillermo¹²,Twicken Joseph D⁵²⁰,Udry Stephane⁹,Wheatley Peter J¹²,Winn Joshua N²¹

Affiliation:

1. Department of Physics, University of Warwick , Coventry CV4 7AL , UK

2. Centre for Exoplanets and Habitability, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL , UK

3. Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP , Rua das Estrelas, 4150-762 Porto , Portugal

4. Laboratoire d’Astrophysique de Marseille , Pole de l’Etoile Site de Chateau-Gombert, 38 Rue Frederic Joliot-Curie, Marseille 13338 , France

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

6. Institute for Computational Science, Center for Theoretical Astrophysics & Cosmology, University of Zurich , Winterthurerstr. 90, 8057 Zurich , Switzerland

7. Department of Physics and Astronomy, Vanderbilt University , Nashville, TN 37235 , USA

8. Centre for Space Domain Awareness, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL , UK

9. Department of Astronomy of the University of Geneva, Geneva Observatory , Chemin Pegasi 51, 1290 Versoix , Switzerland

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

11. Caltech/IPAC , Mail Code 100-22, 1200 E. California Blvd. Pasadena, CA 91125 , USA

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

13. Centro de Astrobiología (CAB, CSIC-INTA), Depto. de Astrofísica , ESAC campus, 28692, Villanueva de la Cañada (Madrid) , Spain

14. European Southern Observatory , Karl-Schwarzschild-Straße 2, 85748 Garching bei München , Germany

15. Physikalisches Institut, University of Bern , Gesellsschaftstrasse 6, 3012 Bern , Switzerland

16. Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218 , USA

17. Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto , Rua do Campo Alegre, 4169-007 Porto , Portugal

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

19. Department of Aeronautics and Astronautics, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA 02139 , USA

20. SETI Institute , Mountain View, CA 94043 , USA

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

Abstract

ABSTRACT We report the discovery of two exoplanets orbiting around HD 212729 (TOI 1052, TIC 317060587), a Teff = 6146 K star with V = 9.51 observed by TESS in Sectors 1 and 13. One exoplanet, TOI-1052b, is Neptune-mass and transits the star, and an additional planet TOI-1052c is observed in radial velocities but not seen to transit. We confirm the planetary nature of TOI-1052b using precise radial velocity observations from HARPS and determined its parameters in a joint RV and photometry analysis. TOI-1052b has a radius of $2.87^{+0.29}_{-0.24}$ R⊕, a mass of 16.9 ± 1.7 M⊕, and an orbital period of 9.14 d. TOI-1052c does not show any transits in the TESS data, and has a minimum mass of $34.3^{+4.1}_{-3.7}$ M⊕ and an orbital period of 35.8 d, placing it just interior to the 4:1 mean-motion resonance. Both planets are best fit by relatively high but only marginally significant eccentricities of $0.18^{+0.09}_{-0.07}$ for planet b and $0.24^{+0.09}_{-0.08}$ for planet c. We perform a dynamical analysis and internal structure model of the planets as well as deriving stellar parameters and chemical abundances. The mean density of TOI-1052b is $3.9^{+1.7}_{-1.3}$ g cm−3 consistent with an internal structure similar to Neptune. A nearby star is observed in Gaia DR3 with the same distance and proper motion as TOI-1052, at a sky projected separation of $\scriptstyle \sim$1500 au, making this a potential wide binary star system.

Funder

STFC

EPSRC

European Research Council

Fundação para a Ciência e a Tecnologia

FCT

Swiss National Science Foundation

CNES

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics