Photo-dynamical Analysis of Circumbinary Multi-planet system TOI-1338: a Fully Coplanar Configuration with a Puffy Planet
arxiv(2024)
摘要
TOI-1338 is the first circumbinary planet system discovered by TESS. It has
one transiting planet at P∼95 day and an outer non-transiting planet at
P∼215 day complemented by RV observation. Here we present a global
photo-dynamical modeling of the TOI-1338 system that self-consistently accounts
for the mutual gravitational interactions between all known bodies in the
system. As a result, the three-dimensional architecture of the system can be
established by comparing the model with additional data from TESS Extended
Mission and published HARPS/ESPRESSO radial velocity data. We report an
inconsistency of binary RV signal between HARPS and ESPRESSO, which could be
due to the contamination of the secondary star. According to stability
analysis, the RV data via ESPRESSO is preferred. Our results are summarized as
follows: (1) the inner transiting planet is extremely coplanar to the binary
plane Δ I_b ∼ 0.12 ^∘, making it a permanently transiting
circumbinary planet at any nodal precession phases. We updated the future
transit ephemerides with improved precisions. (2) The outer planet, despite its
non-transiting nature, is also coplanar with the binary plane by Δ
I_c=9.1^+6.0 ∘_-4.8 (22^∘ for 99% upper limit). (3) The inner
planet could have a density of 0.137 ± 0.026 g/cm^-3. With a TESS
magnitude of 11.45, TOI-1338 b is an optimal circumbinary planet for
ground-based follow-up and transit spectroscopy.
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