Dynamical Mass Demography of Single S-type Planets Shaped by Stellar Companions
Abstract
More than 700 S-type planets have been identified from Gaia and TESS observations, including over 150 transiting targets, enabling the precise dynamical orbits and planetary mass characterization in binary environments. Here we present the first systematic N-body dynamical mass determination for 40 single S-type (Satellite-type orbit) planets in close binaries using an improved Markov Chain Monte Carlo (MCMC) framework with Gaussian priors to model stellar companion perturbations. {For binary systems with aB<100 au, companion-induced perturbations can bias the RV semi-amplitude and consequently the inferred planetary masses. The impact is strongest for short-period sub-Jovian planets, whose masses decrease by up to 20% when transitioning from Keplerian to N-body modeling, while massive Jovian planets with MJup < Mp < 5 MJup show only a 7.2% reduction.} Applying the NAFF stability criterion to TOI-4633, imut = 70∘ is the upper limit for the fast rejection of unstable orbital solutions. Our results reveal that intermediate-mass planets exhibit both positive or negative biases in the inferred masses and influence the observed population of the sub-Jovian desert.
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BibTeX
@misc{huang2026dynamical,
title = {{Dynamical Mass Demography of Single S-type Planets Shaped by Stellar Companions}},
author = {Xiumin Huang and Jianghui Ji},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.29140},
eprint = {2608.29140},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.29140},
}
RIS
TY - UNPB
TI - Dynamical Mass Demography of Single S-type Planets Shaped by Stellar Companions
AU - Xiumin Huang
AU - Jianghui Ji
PY - 2026
DA - 2026/08/29
PB - arXiv
DO - 10.48550/arxiv.2608.29140
UR - https://arxiv.org/abs/2608.29140
AB - More than 700 S-type planets have been identified from Gaia and TESS observations, including over 150 transiting targets, enabling the precise dynamical orbits and planetary mass characterization in binary environments. Here we present the first systematic N-body dynamical mass determination for 40 single S-type (Satellite-type orbit) planets in close binaries using an improved Markov Chain Monte Carlo (MCMC) framework with Gaussian priors to model stellar companion perturbations. {For binary systems with a_B<100 au, companion-induced perturbations can bias the RV semi-amplitude and consequently the inferred planetary masses. The impact is strongest for short-period sub-Jovian planets, whose masses decrease by up to 20% when transitioning from Keplerian to N-body modeling, while massive Jovian planets with M_Jup < M_p < 5 M_Jup show only a 7.2% reduction.} Applying the NAFF stability criterion to TOI-4633, i_mut = 70^∘ is the upper limit for the fast rejection of unstable orbital solutions. Our results reveal that intermediate-mass planets exhibit both positive or negative biases in the inferred masses and influence the observed population of the sub-Jovian desert.
ER -