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February 5, 20260 citations

The JADE Code: Modeling Atmospheric Evolution and Orbital Dynamics of Exoplanets

The JADE code

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Authors

MAM. AttiaVBV. BourrierEBE. Bolmont

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Overview

Simulations reveal the formation pathways of GJ 436 b, indicating survival mechanisms in close-in exoplanets.

Key Points

  • This research investigates the formation pathways and survival mechanisms of close-in exoplanets, particularly GJ 436 b.
  • Employed the JADE code to model planetary atmospheres and orbital dynamics.
  • Integrated atmospheric photoevaporation with high-eccentricity migration influenced by ZLK cycles.
  • Conducted over 500,000 fully coupled simulations with precomputed grids and Bayesian inference.
  • Constrained GJ 436 b's initial conditions based on simulation results.
  • GJ 436 b likely formed at ~0.3 AU with minimal cumulative mass loss despite atmospheric erosion.
  • Late inward migration triggered by a distant companion helped preserve GJ 436 b's atmosphere.
  • Initial mutual inclinations of 80°-100° best match the observed polar orbit.
  • Identified a viable parameter space for a potential companion, GJ 436 c, disfavoring stellar and brown dwarf masses.

Cite This Study

Attia et al. (2025) studied this question.

synapsesocial.com/papers/69843422f1d9ada3c1fb1ebfhttps://doi.org/10.1051/0004-6361/202555239/pdf
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