Atmospheric characterisation of HIP 67522 b with VLT/CRIRES+ - VLT/CRIRES+ suggests a heavier planet and hints at deuterium fractionation

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Table 1

Adopted HIP 67522 system parameters.

Stellar parameters	Value		Reference
Mass (M_⊙)		1.22	Rizzuto et al. (2020)
Radius (R_⊙)		1.38	Rizzuto et al. (2020)
Effective temperature (K)		5675	Rizzuto et al. (2020)
Systemic velocity (km s⁻¹)		7.4	Rizzuto et al. (2020)

Planetary parameters	Value		Reference
	Isothermal	Two-temperature

Epoch of transit (T₀)	2458604.02376		Barber et al. (2024)
Orbital Period (days)	6.9594731		Barber et al. (2024)
Mass (M_J)	0.087	0.11	This work
Mass (M_Earth)	27.7	34.5	This work
1 σ Mass uncertainty (M_Earth)	$_{- 5.5}^{+ 5.9}$ $Mathematical equation: $^{+5.9}_{-5.5}$$	7.7	This work
Planet-star radius ratio	0.0668		Rizzuto et al. (2020)
Uncertainty on planet-star radius ratio σ_TESS	0.001		Rizzuto et al. (2020)
Radius (R_J)	0.892		Rizzuto et al. (2020)
g (m s⁻²)	2.62	3.27	This work
Planet RV semi-amplitude (km s⁻¹)	120		Barber et al. (2024)
Semi-major axis (au)	0.075		Barber et al. (2024)
Inclination (deg)	89.3		Rizzuto et al. (2020)
Eccentricity	0.0		Fixed
Transit duration (h)	4.82		Rizzuto et al. (2020)
Equilibrium Temperature (K)	1100		Rizzuto et al. (2020)
Metallicity ([C+O/H])	$+ {0.6}_{- 0.4}^{+ 0.4}$ $Mathematical equation: $+0.6^{+0.4}_{-0.4}$$	$+ {1.9}_{- 0.4}^{+ 0.4}$ $Mathematical equation: $+1.9^{+0.4}_{-0.4}$$	This work
C/O ratio	${0.87}_{- 0.09}^{+ 0.05}$ $Mathematical equation: $0.87^{+0.05}_{-0.09}$$	${0.92}_{- 0.07}^{+ 0.04}$ $Mathematical equation: $0.92^{+0.04}_{-0.07}$$	This work

Notes. Parameters retrieved under the isothermal and two-temperature models are listed in separate columns (see text). The other parameters are common to both models. The metallicity and C/O ratio are determined from H₂O, CO, and HDO only.

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