Revisiting TOI-4438 and TOI-442 planetary systems with new observations from SPIRou and TESS

arXiv:2607.13333 · astro-ph.EP · Submitted 2026-07-14 · Read on arXiv

J. Serrano Bell, G. Hébrard, E. Martioli, R. F. Díaz, L. de Almeida, D. Lorenzo-Oliveira, A. Salmi, C. Dorn, M. Valatsou, A. Carmona, M. Ould-Elhkim, L. Arnold, É. Artigau, I. Boisse, X. Bonfils, C. Cadieux, Z. Chakir, N. J. Cook, X. Delfosse, J. -F. Donati, R. Doyon, N. Heidari, J. M. Jenkins, F. Kiefer, S. Lafrance, A. L'Heureux, C. Moutou, J. Morneau, X. Vandelac

astro-ph.EP

Submitted: 2026-07-14

Comments: Accepted for publication in A&A. 20 pages, 21 figures and 7 tables

Code: https://github.com/edermartioli/spirou-polarimetry

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

Terminology

• Core — 11× in this paper · explained in 2 episodes
• Aperture — 4× in this paper · explained in 1 episode
• Aperture Photometry — 4× in this paper · explained in 1 episode
• Metallicity — 4× in this paper · explained in 3 episodes
• Society of PhotoOptical Instrumentation Engineers — 4× in this paper
• Degeneracy — 3× in this paper · explained in 3 episodes
• Simple Aperture Photometry — 3× in this paper
• Accuracy — 2× in this paper · explained in 1 episode
• Active Regions — 2× in this paper · explained in 1 episode
• Transiting Exoplanet Survey Satellite — 2× in this paper
• Transmission spectroscopy — 2× in this paper · explained in 2 episodes
• Calibration — 1× in this paper · explained in 7 episodes
• Canada France Hawaii Telescope — 1× in this paper
• Equation of State (EoS) — 1× in this paper · explained in 4 episodes
• Gaussian Processes (GPs) — 1× in this paper · explained in 2 episodes
• James Webb Space Telescope — 1× in this paper
• Mikulski Archive for Space Telescopes — 1× in this paper
• Presearch Data Conditioning Simple Aperture Photometry — 1× in this paper
• Trace — 1× in this paper · explained in 2 episodes

Sources

• The No-U-Turn Sampler: Adaptively Setting Path Lengths in Hamiltonian Monte Carlo
• Radial velocity homogeneous analysis of M dwarfs observed with HARPS. II. Detection limits and planetary occurrence statistics
• Characterizing the bolometric-photoevaporative transition in young sub-Neptunes with radiation-hydrodynamic simulations
• Practical Bayesian model evaluation using leave-one-out cross-validation and WAIC

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