Revisiting the Warm Sub-Saturn TOI-1710b

J. Orell-Miquel,I. Carleo，J. D. Twicken,G. R. Ricker

Astronomy &amp Astrophysics（2024）

Cited 0|Views24

Abstract

The Transiting Exoplanet Survey Satellite (TESS) provides a continuous suiteof new planet candidates that need confirmation and precise mass determinationfrom ground-based observatories. This is the case for the G-type star TOI-1710,which is known to host a transiting sub-Saturn planet(M_p=28.3±4.7M_⊕) in a long-period orbit(P=24.28 d). Here we combine archival SOPHIE and new and archival HARPS-Nradial velocity data with newly available TESS data to refine the planetaryparameters of the system and derive a new mass measurement for the transitingplanet, taking into account the impact of the stellar activity on the massmeasurement. We report for TOI-1710b a radius ofR_p=5.15±0.12R_⊕, a mass ofM_p=18.4±4.5M_⊕, and a mean bulk density ofρ_ p=0.73±0.18g cm^-3, which are consistent at1.2σ, 1.5σ, and 0.7σ, respectively, with previousmeasurements. Although there is not a significant difference in the final massmeasurement, we needed to add a Gaussian process component to successfully fitthe radial velocity dataset. This work illustrates that adding moremeasurements does not necessarily imply a better mass determination in terms ofprecision, even though they contribute to increasing our full understanding ofthe system. Furthermore, TOI-1710b joins an intriguing class of planets withradii in the range 4-8 R_⊕ that have no counterparts in theSolar System. A large gaseous envelope and a bright host star make TOI-1710b avery suitable candidate for follow-up atmospheric characterization.

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