TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star-Reference-Cited by-同舟云学术

TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star

Published:2020-12-28 Issue:3 Volume:502 Page:3704-3722
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

Addison Brett C¹^ORCID,Wright Duncan J¹,Nicholson Belinda A²¹,Cale Bryson³,Mocnik Teo⁴,Huber Daniel⁵,Plavchan Peter³^ORCID,Wittenmyer Robert A¹,Vanderburg Andrew⁶,Chaplin William J⁷⁸,Chontos Ashley⁵⁹^ORCID,Clark Jake T¹^ORCID,Eastman Jason D¹⁰^ORCID,Ziegler Carl¹¹^ORCID,Brahm Rafael¹²¹³,Carter Bradley D¹,Clerte Mathieu¹,Espinoza Néstor¹⁴^ORCID,Horner Jonathan¹,Bentley John¹⁵,Jordán Andrés¹⁶¹³,Kane Stephen R⁴,Kielkopf John F¹⁷,Laychock Emilie¹⁸,Mengel Matthew W¹^ORCID,Okumura Jack¹,Stassun Keivan G¹⁹²⁰^ORCID,Bedding Timothy R²¹⁸^ORCID,Bowler Brendan P²²,Burnelis Andrius²³,Blanco-Cuaresma Sergi¹⁰^ORCID,Collins Michaela¹⁸,Crossfield Ian²⁴²⁵,Davis Allen B²⁶,Evensberget Dag¹^ORCID,Heitzmann Alexis¹,Howell Steve B²⁷^ORCID,Law Nicholas²⁸,Mann Andrew W²⁸,Marsden Stephen C¹,Matson Rachel A²⁹^ORCID,O’Connor James H¹,Shporer Avi³⁰,Stevens Catherine²³,Tinney C G¹⁵,Tylor Christopher¹,Wang Songhu³¹,Zhang Hui³²,Henning Thomas³³,Kossakowski Diana³³,Ricker George³⁰³⁴,Sarkis Paula³³,Schlecker Martin³³,Torres Pascal³⁵,Vanderspek Roland³⁰,Latham David W¹⁰,Seager Sara³⁰³⁶,Winn Joshua N³⁷,Jenkins Jon M³⁸,Mireles Ismael³⁰,Rowden Pam³⁹^ORCID,Pepper Joshua⁴⁰^ORCID,Daylan Tansu³⁰,Schlieder Joshua E⁴¹,Collins Karen A¹⁰,Collins Kevin I³^ORCID,Tan Thiam-Guan⁴²^ORCID,Ball Warrick H⁷⁸^ORCID,Basu Sarbani²⁶,Buzasi Derek L⁴³,Campante Tiago L⁴⁴⁴⁵^ORCID,Corsaro Enrico⁴⁶,González-Cuesta L⁴⁷⁴⁸^ORCID,Davies Guy R⁷⁸,de Almeida Leandro⁴⁹^ORCID,do Nascimento Jose-Dias⁴⁹¹⁰^ORCID,García Rafael A⁵⁰⁵¹,Guo Zhao⁵²,Handberg Rasmus⁸^ORCID,Hekker Saskia⁵³⁵⁴⁸^ORCID,Hey Daniel R²¹⁸,Kallinger Thomas⁵⁵,Kawaler Steven D⁵⁶,Kayhan Cenk⁵⁷^ORCID,S. Kuszlewicz James⁵⁸⁸^ORCID,Lund Mikkel N⁸^ORCID,Lyttle Alexander⁷⁸,Mathur Savita⁴⁷⁴⁸,Miglio Andrea⁷⁸^ORCID,Mosser Benoit⁵⁹,Nielsen Martin B⁷⁸⁶⁰,Serenelli Aldo M⁶¹⁶²^ORCID,Aguirre Victor Silva⁸,Themeßl Nathalie⁵⁸⁸

Affiliation:

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

2. Sub-department of Astrophysics, Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH, UK

3. Department of Physics & Astronomy, George Mason University, 4400 University Drive MS 3F3, Fairfax, VA 22030, USA

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

5. Institute for Astronomy, University of Hawai‘i, 2680 Woodlawn Drive, Honolulu, HI 96822, USA

6. Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706, USA

7. School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK

8. Stellar Astrophysics Centre (SAC), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

9. NSF Graduate Research Fellow

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

11. Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, Ontario M5S 3H4, Canada

12. Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Av. Diagonal las Torres 2640, Peñalolén, Santiago, Chile

13. Millennium Institute for Astrophysics, Faculty of Physics, Campus San Joaquin UC, Av. Vicuna Mackenna, 4860, Mascul, Santiago, Chile

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

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

16. Facultad de Ingeniera y Ciencias, Universidad Adolfo Ibáñez, Av. Diagonal las Torres 2640, Peñalolén, Santiago, Chile

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

18. Department of Physical Sciences, Kutztown University, Kutztown, PA 19530, USA

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

20. Department of Physics, Fisk University, 1000 18th Ave. N., Nashville, TN 37208, USA

21. Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, 2006, Sydney, Australia

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

23. Department of Physics, Westminster College, 319 South Market Street, New Wilmington, PA 16172, USA

24. Department of Physics and Astronomy, University of Kansas, 1251 Wescoe Hall Dr.,Lawrence, KS 66045, USA

25. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA

26. Department of Astronomy, Yale University, New Haven, CT 06511, USA

27. Space Science & Astrobiology Division, NASA Ames Research Center, Moffett Field, CA 94035, USA

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

29. U.S. Naval Observatory, 3450 Massachusetts Avenue NW, Washington, D.C. 20392, USA

30. MIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA

31. Astronomy Department, Indiana University Bloomington, 727 East 3rd Street, Swain West 318, IN 4740, USA

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

33. Max-Planck-Institut für Astronomie, Königstuhl 17, Heidelberg 69117, Germany

34. MIT Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA

35. Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile

36. Earth and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA

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

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

39. School of Physical Sciences, The Open University, Milton Keynes MK7 6AA, UK

40. Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, PA 18015, USA

41. Exoplanets and Stellar Astrophysics Laboratory, Mail Code 667, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA

42. Perth Exoplanet Survey Telescope, Perth, Western Australia

43. Department of Chemistry & Physics, Florida Gulf Coast University, 10501 FGCU Blvd. S., Fort Myers, FL 33965 USA

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

45. Departamento de Física e Astronomia, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, s/n, PT4169-007 Porto, Portugal

46. INAF - Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123, Catania, Italy

47. Instituto de Astrofísica de Canarias (IAC), 38205 La Laguna, Tenerife, Spain

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

49. Universidade Federal do Rio Grande do Norte (UFRN), Departamento de Física, 59078-970, Natal, RN, Brazil

50. IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France

51. AIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, F-91191 Gif-sur-Yvette, France

52. Center for Exoplanets and Habitable Worlds, Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvania State University, University Park, PA 16802, USA

53. Zentrum für Astronomy (ZAH/LSW) der Universität Heidelberg, Königstuhl 12, D-69117 Heidelberg, Germany

54. HITS gGmbH, Schloss-Wolfsbrunnenweg 35, 69118 Heidelberg, Germany

55. Institute of Astrophysics, University of Vienna, 1180 Vienna, Austria

56. Department of Physics and Astronomy, Iowa State University, Ames, IA 50011 USA

57. Department of Astronomy & Space Sciences, Erciyes University, Kayseri, Turkey

58. Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany

59. LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, 92195 Meudon, France

60. Center for Space Science, NYUAD Institute, New York University Abu Dhabi, PO Box 129188, Abu Dhabi, UAE

61. Institute of Space Sciences (ICE, CSIC) Campus UAB, Carrer de Can Magrans, s/n, E-08193, Barcelona, Spain

62. Institut d’Estudis Espacials de Catalunya (IEEC), C/Gran Capita, 2-4, E-08034, Barcelona, Spain

Abstract

ABSTRACT We report the discovery of a warm sub-Saturn, TOI-257b (HD 19916b), based on data from NASA’s Transiting Exoplanet Survey Satellite (TESS). The transit signal was detected by TESS and confirmed to be of planetary origin based on radial velocity observations. An analysis of the TESS photometry, the Minerva-Australis, FEROS, and HARPS radial velocities, and the asteroseismic data of the stellar oscillations reveals that TOI-257b has a mass of MP = 0.138 ± 0.023 $\rm {M_J}$ (43.9 ± 7.3 $\, M_{\rm \oplus}$), a radius of RP = 0.639 ± 0.013 $\rm {R_J}$ (7.16 ± 0.15 $\, \mathrm{ R}_{\rm \oplus}$), bulk density of $0.65^{+0.12}_{-0.11}$ (cgs), and period $18.38818^{+0.00085}_{-0.00084}$ $\rm {days}$. TOI-257b orbits a bright (V = 7.612 mag) somewhat evolved late F-type star with M* = 1.390 ± 0.046 $\rm {M_{sun}}$, R* = 1.888 ± 0.033 $\rm {R_{sun}}$, Teff = 6075 ± 90 $\rm {K}$, and vsin i = 11.3 ± 0.5 km s−1. Additionally, we find hints for a second non-transiting sub-Saturn mass planet on a ∼71 day orbit using the radial velocity data. This system joins the ranks of a small number of exoplanet host stars (∼100) that have been characterized with asteroseismology. Warm sub-Saturns are rare in the known sample of exoplanets, and thus the discovery of TOI-257b is important in the context of future work studying the formation and migration history of similar planetary systems.

Funder

Australian Research Council

University of Southern Queensland

Nanjing University

George Mason University

University of Louisville

University of Florida

University of Texas at Austin

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics