TOI-4641b: an aligned warm Jupiter orbiting a bright (V=7.5) rapidly rotating F-star

Author:

Bieryla Allyson12ORCID,Zhou George2ORCID,García-Mejía Juliana13ORCID,Fairnington Tyler R1ORCID,Latham David W1ORCID,Carter Brad2ORCID,Dong Jiayin4ORCID,Huang Chelsea X2ORCID,Murphy Simon J2ORCID,Shporer Avi3ORCID,Collins Karen A1ORCID,Quinn Samuel N1ORCID,Everett Mark E5ORCID,Buchhave Lars A6ORCID,Tronsgaard René6ORCID,Charbonneau David1ORCID,Johnson Marshall C7ORCID,Esquerdo Gilbert A1ORCID,Calkins Michael1,Berlind Perry1,Jenkins Jon M8ORCID,Ricker George R3ORCID,Seager Sara3910ORCID,Winn Joshua N11ORCID,Barclay Thomas12ORCID,Mireles Ismael13ORCID,Paegert Martin1ORCID,Twicken Joseph D14ORCID

Affiliation:

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

2. Centre for Astrophysics, University of Southern Queensland , West Street, Toowoomba, QLD 4350 Australia

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

4. Center for Computational Astrophysics, Flatiron Institute , 162 Fifth Avenue, New York, NY 10010 , USA

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

6. DTU Space, Technical University of Denmark , Elektrovej 328, DK-2800 Kgs. Lyngby , Denmark

7. Department of Astronomy, The Ohio State University , 4055 McPherson Laboratory, 140 West 18th Ave., Columbus, OH 43210 USA

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

9. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology , 77 Massachusetts Ave, Cambridge, MA 02139 , USA

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

11. Department of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08544 , USA

12. NASA Goddard Space Flight Center , 8800 Greenbelt Road, Greenbelt, MD 20771 , USA

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

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

Abstract

ABSTRACT We report the discovery of TOI-4641b, a warm Jupiter transiting a rapidly rotating F-type star with a stellar effective temperature of 6560 K. The planet has a radius of 0.73 RJup, a mass smaller than 3.87 MJup(3σ), and a period of 22.09 d. It is orbiting a bright star (V=7.5 mag) on a circular orbit with a radius and mass of 1.73 R⊙ and 1.41 M⊙. Follow-up ground-based photometry was obtained using the Tierras Observatory. Two transits were also observed with the Tillinghast Reflector Echelle Spectrograph, revealing the star to have a low projected spin-orbit angle (λ=$1.41^{+0.76}_{-0.76}$°). Such obliquity measurements for stars with warm Jupiters are relatively few, and may shed light on the formation of warm Jupiters. Among the known planets orbiting hot and rapidly rotating stars, TOI-4641b is one of the longest period planets to be thoroughly characterized. Unlike hot Jupiters around hot stars which are more often misaligned, the warm Jupiter TOI-4641b is found in a well-aligned orbit. Future exploration of this parameter space can add one more dimension to the star–planet orbital obliquity distribution that has been well sampled for hot Jupiters.

Funder

Australian Research Council

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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