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

Šubjak, J. ; Endl, M. ; Chaturvedi, P. ; Karjalainen, R. ; Cochran, W. D. ; Esposito, M. ; Gandolfi, D. ; Lam, K. W. F. ; Stassun, K. and Žák, J. , et al. (2022) In Astronomy and Astrophysics 662.
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 Teff = 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 OndR ejov... (More)

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 Teff = 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 OndR ejov Observatories, we measured a planetary mass of Mp = 96.4 ± 8.3 Mp and a radius of Rp = 9.1 ± 0.6 Rp. 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 planeta's tidal quality factor to the range of 104.5-5.3. When compared with the sample of other non-inflated Saturn-mass planets, TOI-1268b is one of the best candidates for transmission spectroscopy studies.

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type
Contribution to journal
publication status
published
subject
keywords
Planetary systems, Planets and satellites: Atmospheres, Planets and satellites: gaseous planets, Techniques: photometric, Techniques: radial velocities, Techniques: spectroscopic
in
Astronomy and Astrophysics
volume
662
article number
A107
publisher
EDP Sciences
external identifiers
  • scopus:85133281398
ISSN
0004-6361
DOI
10.1051/0004-6361/202142883
language
English
LU publication?
no
additional info
Publisher Copyright: © ESO 2022.
id
2ae22dc5-442b-4dea-8b7b-7a232011cd75
date added to LUP
2023-01-17 09:38:58
date last changed
2023-01-25 11:25:03
@article{2ae22dc5-442b-4dea-8b7b-7a232011cd75,
  abstract     = {{<p>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 Teff = 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 OndR ejov Observatories, we measured a planetary mass of Mp = 96.4 ± 8.3 Mp and a radius of Rp = 9.1 ± 0.6 Rp. 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 planeta's tidal quality factor to the range of 104.5-5.3. When compared with the sample of other non-inflated Saturn-mass planets, TOI-1268b is one of the best candidates for transmission spectroscopy studies.</p>}},
  author       = {{Šubjak, J. and Endl, M. and Chaturvedi, P. and Karjalainen, R. and Cochran, W. D. and Esposito, M. and Gandolfi, D. and Lam, K. W. F. and Stassun, K. and Žák, J. and Lodieu, N. and Boffin, H. M. J. and MacQueen, P. J. and Hatzes, A. and Guenther, E. W. and Georgieva, I. and Grziwa, S. and Schmerling, H. and Skarka, M. and Blažek, M. and Karjalainen, M. and Špoková, M. and Isaacson, H. and Howard, A. W. and Burke, C. J. and Van Eylen, V. and Falk, B. and Fridlund, M. and Goffo, E. and Jenkins, J. M. and Korth, J. and Lissauer, J. J. and Livingston, J. H. and Luque, R. and Muresan, A. and Osborn, H. P. and Pallé, E. and Persson, C. M. and Redfield, S. and Ricker, G. R. and Seager, S. and Serrano, L. M. and Smith, A. M. S. and Kabáth, P.}},
  issn         = {{0004-6361}},
  keywords     = {{Planetary systems; Planets and satellites: Atmospheres; Planets and satellites: gaseous planets; Techniques: photometric; Techniques: radial velocities; Techniques: spectroscopic}},
  language     = {{eng}},
  month        = {{06}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{TOI-1268b : The youngest hot Saturn-mass transiting exoplanet}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/202142883}},
  doi          = {{10.1051/0004-6361/202142883}},
  volume       = {{662}},
  year         = {{2022}},
}