Revisiting the warm sub-Saturn TOI-1710b

J. Orell-Miquel*, I. Carleo, F. Murgas, G. Nowak, E. Pallé, R. Luque, T. Masseron, J. Sanz-Forcada, D. Dragomir, P. A. Dalba, R. Tronsgaard, J. Wittrock, K. Kim, C. Stibbards, K. I. Collins, P. Plavchan, S. B. Howell, E. Furlan, L. A. Buchhave, C. L. GnilkaA. F. Gupta, Th Henning, K. V. Lester, J. E. Rodriguez, N. J. Scott, H. P. Osborn, S. Villanueva, S. Seager, J. N. Winn, J. M. Jenkins, R. Vanderspek, D. W. Latham, P. Rowden, D. Watanabe, G. Torres, C. J. Burke, T. Daylan, T. Barclay, J. D. Twicken, G. R. Ricker

*Corresponding author for this work

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Abstract

The Transiting Exoplanet Survey Satellite (TESS) provides a continuous suite of new planet candidates that need confirmation and precise mass determination from ground-based observatories. This is the case for the G-type star TOI-1710, which is known to host a transiting sub-Saturn planet (Mp = 28.3 ± 4.7 M.) in a long-period orbit (P= 24.28 days). Here we combine archival SOPHIE and new and archival HARPS-N radial velocity data with newly available TESS data to refine the planetary parameters of the system and derive a new mass measurement for the transiting planet, taking into account the impact of the stellar activity on the mass measurement. We report for TOI-1710b a radius of Rp = 5.15 ± 0.12 R., a mass of Mp = 18.4 ± 4.5 M., and a mean bulk density of ρp = 0.73 ± 0.18 g cm−3, which are consistent at 1.2σ, 1.5σ, and 0.7σ, respectively, with previous measurements. Although there is not a significant difference in the final mass measurement, we needed to add a Gaussian process component to successfully fit the radial velocity dataset. This work illustrates that adding more measurements does not necessarily imply a better mass determination in terms of precision, even though they contribute to increasing our full understanding of the system. Furthermore, TOI-1710b joins an intriguing class of planets with radii in the range 4–8 R. that have no counterparts in the Solar System. A large gaseous envelope and a bright host star make TOI-1710b a very suitable candidate for follow-up atmospheric characterization.

Original languageEnglish
Article numberA96
JournalAstronomy and Astrophysics
Volume684
Number of pages19
ISSN0004-6361
DOIs
Publication statusPublished - 2024

Keywords

  • Planets and satellites: individual: TOI-1710b
  • Stars: individual: TOI-1710
  • Techniques: photometric
  • Techniques: radial velocities

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