The bulk metal content of WASP-80 b from joint interior-atmosphere retrievals - Breaking degeneracies and exploring biases with panchromatic spectra

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Volume 706 (February 2026)

A&A, 706 (2026) A263

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Table 6

Atmospheric and bulk interior composition of WASP-80 b under the two fiducial scenarios.

Parameter	Secular cooling (JR6)	Additional heating (JR5*)
Atmospheric metallicity, M/H [× solar]	${2.75}_{- 0.56}^{+ 0.88}$ $2.75_{ - 0.56}^{ + 0.88}$	${10.00}_{- 4.75}^{+ 8.20}$ $10.00_{ - 4.75}^{ + 8.20}$
Atmospheric C/O	${0.12}_{- 0.02}^{+ 0.03}$ $0.12_{ - 0.02}^{ + 0.03}$	0.24 ± 0.09
Core mass, M_core (M_⊕)	${3.49}_{- 1.59}^{+ 3.49}$ $3.49_{ - 1.59}^{ + 3.49}$	${31.8}_{- 17.5}^{+ 21.3}$ $31.8_{ - 17.5}^{ + 21.3}$
Planetary bulk metal mass fraction, Z_planet	0.12 ± 0.02	0.28±0.11
Planet-to-star bulk metal mass fraction ratio, Z_planet/Z_star	${12.1}_{- 5.1}^{+ 4.9}$ $12.1_{ - 5.1}^{ + 4.9}$	${30.3}_{- 15.9}^{+ 15.5}$ $30.3_{ - 15.9}^{ + 15.5}$

Notes. The first fiducial scenario is secular cooling, where no additional heating sources exist. The internal temperature is constrained by age and equilibrium chemistry is assumed in this scenario, whereas the second scenario corresponds to additional heating sources (i.e., Ohmic dissipation).

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