Table · dataset · 2026

Chabrier+2019/2021 hydrogen and helium EOS tables in PALEOS format for PROTEUS

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Description

Hydrogen, helium, and hydrogen-helium mixture equation of state (EOS) tables converted to the PALEOS column format used by the PROTEUS planetary evolution framework. The original EOS data are from Chabrier, Mazevet & Soubiran (2019, ApJ 872, 51) and Chabrier & Debras (2021, ApJ 917, 4), available at perso.ens-lyon.fr/gilles.chabrier/DirEOS/DirEOS2021 Each table provides pressure, temperature, density, internal energy, entropy, heat capacity at constant pressure (cp), heat capacity at constant volume (cv), thermal expansivity (alpha), and the adiabatic gradient (nabla_ad) on a regular grid in log10(P) and log10(T).

The tables cover temperatures from 100 to 10^8 K, pressures from 1 Pa to 10^22 Pa, spanning the full range from giant planet envelopes to stellar interiors. Converted tables (PALEOS format, used by Zalmoxis and SPIDER): - chabrier2021_H.dat: Pure hydrogen - chabrier2021_HE.dat: Pure helium - chabrier2021_HHe_Y0275.dat: H/He mixture, Y = 0.275 (protosolar) - chabrier2021_HHe_Y0292.dat: H/He mixture, Y = 0.292 (DUSTY/COND models) - chabrier2021_HHe_Y0297.dat: H/He mixture, Y = 0.297 (BHAC2015 models) Original tables from Chabrier are included in the original_tables/ subdirectory for reproducibility.

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Columns directly from the Chabrier tables: P, T, rho, u, s, nabla_ad. Derived columns: cp (from nabla_ad and alpha), cv (from the Mayer relation), alpha (from the logarithmic density derivative). Full derivation details and reliability assessment are documented in the conversion script available in Zalmoxis/src/tools.

Known limitations: - cp is unreliable in the H2 dissociation zone (T ~ 3000-30000 K, P ~ 0.1-1000 GPa) where nabla_ad is clamped at 0.100 in the original tables. These points are flagged as phase_id = "dissociating". - cv may be numerically unreliable near phase transitions due to cancellation in the Mayer relation. Flagged points have ":cv_unreliable" appended to the phase_id column.

The "effective" hydrogen table (TABLE_H_TP_effective) is included in not_used_in_zalmoxis/ but must NOT be used as a standalone pure H EOS. It is designed only for computing H/He mixtures beyond the ideal volume law, following Eqs. 8-11 of Chabrier et al. (2019). Mirror of Zenodo deposit 10.5281/zenodo.19135021.

Zenodo is the primary source.

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Stated by source: Astronomy and Astrophysics
From keywords: Astronomy & Astrophysics
Inferred from text: Tabular 65%

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IISH Dataverse	doi:10.34894/VFKWLJ	10 d ago	JSON v1

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concepts[field].local:field:astronomy	mapping · datasets iisg amsterdam	connector:datasets_iisg_amsterdam@1.0.0	/subjects
concepts[modality].local:modality:tabular	enrichment · datasets iisg amsterdam	keyword-concept-rules@1.0.0	title+description (65%)
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Chabrier+2019/2021 hydrogen and helium EOS tables in PALEOS format for PROTEUS

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