51 Peg b revisited with VLT/CRIRES+. Constraints on atmospheric thermal structure, chemical composition, and an alternative orbital solution

arXiv:2605.23582 · astro-ph.EP · Submitted 2026-05-22 · Read on arXiv

D. Cont, L. Nortmann, F. Lesjak, U. Seemann, L. D. Nielsen, B. Wechselberger, F. Yan, S. Liu, A. Reiners, A. Lavail, D. Shulyak, A. Hatzes, N. Piskunov, L. Boldt-Christmas, S. Czesla, E. W. Guenther, O. Kochukhov, T. Marquart, E. Nagel, A. D. Rains, M. Rengel

astro-ph.EP

Submitted: 2026-05-22

Comments: Accepted for publication in A&A

Code: https://github.com/exoclime/FastChem

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Metallicity — 8× in this paper · explained in 3 episodes
• Abundance — 7× in this paper · explained in 1 episode
• Spectral Signature — 5× in this paper · explained in 2 episodes
• Alignment — 4× in this paper · explained in 1 episode
• Calibration — 3× in this paper · explained in 7 episodes
• Adaptive Optics (AO) — 1× in this paper · explained in 2 episodes
• Bayesian Framework — 1× in this paper · explained in 3 episodes
• Benchmark — 1× in this paper · explained in 2 episodes
• Degeneracy — 1× in this paper · explained in 3 episodes
• Robustness — 1× in this paper · explained in 5 episodes
• Trace — 1× in this paper · explained in 2 episodes
• Transmission spectroscopy — 1× in this paper · explained in 2 episodes

Sources

• On the robustness of exoplanet atmospheric detections: insights from extensive simulations
• Locked In Ice: how Pebble Drift and Volatile Entrapment can Significantly Impact Carbon and Oxygen Ratios in Evolving Protoplanetary Discs

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