Weighing the mass of LHS 3844 b
Alejandro Hacker, Nicola Astudillo-Defru, Rodrigo F. D\'iaz, Caroline Dorn, Xavier Bonfils, Jos\'e M. Almenara, P\'ia Cort\'es-Zuleta, Xavier Delfosse, Thierry Forveille, Stephane Udry

TL;DR
This study precisely measures the mass of exoplanet LHS 3844 b using Bayesian analysis of RV data, confirming its rocky nature and providing insights into its interior composition.
Contribution
It presents the first robust mass measurement of LHS 3844 b through Bayesian analysis of high-precision RV data, exploring various noise models for reliability.
Findings
Planetary mass is $2.27 1 0.23$ M$_\u2299$
Bulk density indicates a rocky composition
Model comparison favors stellar rotation-related variability kernels
Abstract
Context: LHS 3844 b (TOI-136 b) is a ultra short-period, Earth-size exoplanet detected by TESS. It is one of the most favourable object for atmospheric characterisation and the study of its surface with the James Webb Space Telescope. However, the dynamical mass of this planet has not been measured yet. Aims: We aim to determine the mass of LHS 3844 b using high-precision radial velocity (RV) measurements and assess the robustness of the inferred signal across different noise and orbital modelling assumptions. Methods: We analyse 25 ESPRESSO RV observations within a fully Bayesian framework. We explore 15 competing RV models that differ in their treatment of correlated stellar variability (through different Gaussian Process kernels) and long-term drifts. Marginal likelihoods are computed for all models and used for Bayesian model comparison and evidence-weighted parameter estimation.…
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