CaltechAUTHORS
Published June 2022 | Version Published + Accepted Version
Journal Article Open

TOI-1268b: The youngest hot Saturn-mass transiting exoplanet

Creators

  • 1. ROR icon Astronomical Institute
  • 2. ROR icon European Southern Observatory
  • 3. ROR icon The University of Texas at Austin
  • 4. ROR icon University of Turin
  • 5. ROR icon Technical University of Berlin
  • 6. ROR icon German Aerospace Center
  • 7. ROR icon Vanderbilt University
  • 8. ROR icon Fisk University
  • 9. ROR icon Instituto de Astrofísica de Canarias
  • 10. ROR icon University of La Laguna
  • 11. ROR icon Chalmers University of Technology
  • 12. ROR icon Rhenish Institute for Environmental Research
  • 13. ROR icon Masaryk University
  • 14. ROR icon University of California, Berkeley
  • 15. ROR icon California Institute of Technology
  • 16. ROR icon Massachusetts Institute of Technology
  • 17. ROR icon University College London
  • 18. ROR icon Space Telescope Science Institute
  • 19. ROR icon Leiden University
  • 20. ROR icon Ames Research Center
  • 21. ROR icon University of Tokyo
  • 22. ROR icon Astrobiology Center
  • 23. ROR icon National Astronomical Observatory of Japan
  • 24. ROR icon Instituto de Astrofísica de Andalucía
  • 25. ROR icon University of Bern
  • 26. ROR icon Wesleyan University

Abstract

We report the discovery of TOI-1268b, a transiting Saturn-mass planet from the TESS space mission. With an age of less than 1 Gyr, derived from various age indicators, TOI-1268b is the youngest Saturn-mass planet known to date; it contributes to the small sample of well-characterised young planets. It has an orbital period of P = 8.1577080 ± 0.0000044 days, and transits an early K-dwarf star with a mass of M_* = 0.96 ± 0.04 M_⊙, a radius of R_* = 0.92 ± 0.06 R_⊙, an effective temperature of T_(eff) = 5300 ± 100 K, and a metallicity of 0.36 ± 0.06 dex. By combining TESS photometry with high-resolution spectra acquired with the Tull spectrograph at the McDonald Observatory, and the high-resolution spectrographs at the Tautenburg and Ondřejov Observatories, we measured a planetary mass of Mₚ = 96.4 ± 8.3 M_⊕ and a radius of Rₚ = 9.1 ± 0.6 R_⊕. TOI-1268 is an ideal system for studying the role of star-planet tidal interactions for non-inflated Saturn-mass planets. We used system parameters derived in this paper to constrain the planet's tidal quality factor to the range of 10^(4.5–5.3). When compared with the sample of other non-inflated Saturn-mass planets, TOI-1268b is one of the best candidates for transmission spectroscopy studies.

Additional Information

© ESO 2022. Received: 10 December 2021 Accepted: 16 February 2022. This work was supported by the KESPRINT collaboration, an international consortium devoted to the characterisation and research of exoplanets discovered with space-based missions (www.kesprint.science). J.S., R.K., M.S., M.K. and P.K. would like to acknowledge support from MSMT grant LTT-20015. J.S. and P.K. acknowledge a travel budget from ERASMUS+ grant 2020-1-CZ01-KA203-078200. J.S. would like to acknowledge support from the Grant Agency of Charles University: GAUK No. 314421. P.C. acknowledges the generous support from Deutsche Forschungsgemeinschaft (DFG) of the grant CH 2636/1-1. We are grateful for the generous support by Thüringer Ministerium für Wirtschaft, Wissenschaft und Digitale Gesellschaft. K.W.F.L. was supported by Deutsche Forschungsgemeinschaft grants RA714/14-1 within the DFG Schwerpunkt SPP 1992, Exploring the Diversity of Extrasolar Planets. N.L. was financially supported by the Ministerio de Economia y Competitividad and the Fondo Europeo de Desarrollo Regional (FEDER) under AYA2015-69350-C3-2-P. E.G. is thankful for the generously supported by the by the Thüringer Ministerium für Wirtschaft, Wissenschaft und Digitale Gesellschaft and the staff of the Alfred-Jensch-Teleskop. I.G., M.F., J.K., and C.M.P., gratefully acknowledge the support of the Swedish National Space Agency (DNR 174/18, 2020-00104, 65/19). This work was supported by JSPS KAKENHI grant number 20K14518. R.L. acknowledges financial support from the Spanish Ministerio de Ciencia e Innovación, through project PID2019-109522GB-C52, and the Centre of Excellence "Severo Ochoa" award to the Instituto de Astrofísica de Andalucía (SEV-2017-0709). L.M.S. gratefully acknowledges financial support from the CRT foundation under Grant No. 2018.2323 "Gaseous or rocky? Unveiling the nature of small worlds". This work has been carried out within the framework of the NCCR PlanetS supported by the Swiss National Science Foundation. We acknowledge the use of public TESS data from pipelines at the TESS Science Office and at the TESS Science Processing Operations Center. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center for the production of the SPOC data products. This paper includes data collected with the TESS mission, obtained from the MAST data archive at the Space Telescope Science Institute (STScI). Funding for the TESS mission is provided by the NASA Explorer Program. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This publication makes use of VOSA, developed under the Spanish Virtual Observatory project supported by the Spanish MINECO through grant AyA2017-84089. VOSA has been partially updated by using funding from the European Union's Horizon 2020 Research and Innovation Programme, under Grant Agreement no 776403 (EXOPLANETS-A). This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France.

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Accepted Version - 2201.13341.pdf

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Additional details

Identifiers

Eprint ID
115737
Resolver ID
CaltechAUTHORS:20220721-8563000

Related works

Describes
https://arxiv.org/abs/2201.13341 (URL)

Funding

Ministry of Education, Youth and Sports (Czech Republic)
LTT-20015
Erasmus+
2020-1-CZ01-KA203-078200
Charles University Grant Agency (GA UK)
314421
Deutsche Forschungsgemeinschaft (DFG)
CH 2636/1-1
Thüringer Ministerium für Wirtschaft, Wissenschaft und Digitale Gesellschaft
Deutsche Forschungsgemeinschaft (DFG)
RA714/14-1
Deutsche Forschungsgemeinschaft (DFG)
SPP 1992
Ministerio de Economía, Industria y Competitividad (MINECO)
AYA2015-69350-C3-2-P
European Regional Development Fund
Swedish National Space Agency
DNR 174/18, 2020-00104, 65/19
Japan Society for the Promotion of Science (JSPS)
20K14518
Ministerio de Ciencia e Innovación (MICINN)
PID2019-109522GB-C52
Severo Ochoa
SEV-2017-0709
CRT foundation
2018.2323
Swiss National Science Foundation (SNSF)
NASA
NAS 5-26555
Gaia Multilateral Agreement
Ministerio de Economía, Industria y Competitividad (MINECO)
AyA2017-84089
European Research Council (ERC)
776403

Dates

Created
2022-07-22
Created from EPrint's datestamp field
Updated
2022-07-22
Created from EPrint's last_modified field

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Caltech groups
Astronomy Department