HD 183579b: a warm sub-Neptune transiting a solar twin detected by TESS

Author:

Gan Tianjun1ORCID,Bedell Megan2,Wang Sharon Xuesong1,Foreman-Mackey Daniel2,Meléndez Jorge3,Mao Shude14,Stassun Keivan G56ORCID,Howell Steve B7,Ziegler Carl8,Wittenmyer Robert A9,Hellier Coel10,Collins Karen A11,Shporer Avi12,Ricker George R12,Vanderspek Roland12,Latham David W11,Seager Sara121314,Winn Joshua N15,Jenkins Jon M7,Addison Brett C9ORCID,Ballard Sarah16,Barclay Thomas1718,Bean Jacob L19,Bowler Brendan P20,Briceño César21,Crossfield Ian J M22,Dittman Jason1123,Horner Jonathan9ORCID,Jensen Eric L N24,Kane Stephen R25,Kielkopf John26,Kreidberg Laura1123,Law Nicholas27,Mann Andrew W27,Mengel Matthew W9ORCID,Morgan Edward H12,Okumura Jack9,Osborn Hugh P1228,Paegert Martin11,Plavchan Peter29ORCID,Schwarz Richard P30,Shiao Bernie31,Smith Jeffrey C732,Spina Lorenzo33ORCID,Tinney C G34,Torres Guillermo11,Twicken Joseph D732,Vezie Michael12,Wang Gavin3536,Wright Duncan J9,Zhang Hui37

Affiliation:

1. Department of Astronomy and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, China

2. Center for Computational Astrophysics , Flatiron Institute, 162 Fifth Ave, New York, NY 10010, USA

3. Departamento de Astronomia , IAG, Universidade de São Paulo, Rua do Matão 1226, São Paulo 05509-900, Brazil

4. National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China

5. Department of Physics and Astronomy, Vanderbilt University, 6301 Stevenson Center Ln., Nashville, TN 37235, USA

6. Department of Physics, Fisk University, 1000 17th Avenue North, Nashville, TN 37208, USA

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

8. Department of Physics , Engineering and Astronomy, Stephen F. Austin State University, 1936 North St, Nacogdoches, TX 75962, USA

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

10. Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK

11. Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA

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

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

14. Department of Aeronautics and Astronautics , MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA

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

16. Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611, USA

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

18. University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA

19. Department of Astronomy and Astrophysics, University of Chicago, 5640 S. Ellis Ave, Chicago, IL 60637, USA

20. Department of Astronomy, The University of Texas at Austin, Austin, TX 78712, USA

21. Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile

22. Department of Physics & Astronomy, University of Kansas, 1082 Malott,1251 Wescoe Hall Dr., Lawrence, KS 66045, USA

23. Max Planck Institute for Astronomy, Konigstuhl 17, D-69117 Heidelberg, Germany

24. Department of Physics & Astronomy , Swarthmore College, Swarthmore, PA 19081, USA

25. Department of Earth and Planetary Sciences, University of California, Riverside, CA 92521, USA

26. Department of Physics and Astronomy, University of Louisville, Louisville, KY 40292, USA

27. Department of Physics and Astronomy, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3255, USA

28. NCCR/PlanetS, Centre for Space and Habitability, University of Bern, CH-3012 Bern, Switzerland

29. George Mason University, 4400 University Drive MS 3F3, Fairfax, VA 22030, USA

30. Patashnick Voorheesville Observatory, Voorheesville, NY 12186, USA

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

32. SETI Institute, 189 Bernardo Ave, Suite 200, Mountain View, CA 94043, USA

33. INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova, Italy

34. Exoplanetary Science at UNSW , School of Physics, UNSW Sydney, NSW 2052, Australia

35. Tsinghua International School, Beijing 100084, China

36. Stanford Online High School, 415 Broadway Academy Hall, Floor 2, 8853, Redwood City, CA 94063, USA

37. School of Astronomy and Space Science , Key Laboratory of Modern Astronomy and Astrophysics in Ministry of Education, Nanjing University, Nanjing 210046, Jiangsu, China

Abstract

ABSTRACT We report the discovery and characterization of a transiting warm sub-Neptune planet around the nearby bright (V = 8.75 mag, K = 7.15 mag) solar twin HD 183579, delivered by the Transiting Exoplanet Survey Satellite (TESS). The host star is located 56.8 ± 0.1 pc away with a radius of R* = 0.97 ± 0.02 R⊙ and a mass of M* = 1.03 ± 0.05 M⊙. We confirm the planetary nature by combining space and ground-based photometry, spectroscopy, and imaging. We find that HD 183579b (TOI-1055b) has a radius of Rp = 3.53 ± 0.13 R⊕ on a 17.47 d orbit with a mass of Mp = 11.2 ± 5.4 M⊕ (3σ mass upper limit of 27.4 M⊕). HD 183579b is the fifth brightest known sub-Neptune planet system in the sky, making it an excellent target for future studies of the interior structure and atmospheric properties. By performing a line-by-line differential analysis using the high-resolution and signal-to-noise ratio HARPS spectra, we find that HD 183579 joins the typical solar twin sample, without a statistically significant refractory element depletion.

Funder

National Science Foundation of China

FAPESP

NSFC

Swiss National Science Foundation

National Aeronautics and Space Administration

European Southern Observatory

European Space Agency

HEC

NAS

Australian Research Council

University of Southern Queensland

UNSW

MIT

Nanjing University

George Mason University

University of Louisville

University of Florida

University of Texas at Austin

ESO

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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