Revisiting the warm sub-Saturn TOI-1710b
arxiv(2024)
摘要
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
(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-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
R_p=5.15±0.12R_⊕, a mass of
M_p=18.4±4.5M_⊕, and a mean bulk density of
ρ_ p=0.73±0.18g 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.
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