First comparative exoplanetology within a transiting multi-planet system: Comparing the atmospheres of V1298 Tau b and c

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Volume 692 (December 2024)

A&A, 692 (2024) A198

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Table 2

Derived parameters from atmospheric retrievals run using ATMO (see Sect. 3.2) for planet c and planet b.

Planet	Parameter	Free mass retrieval (ATMO)	Fixed mass (10 M_⊕)	Fixed mass (50 M_⊕)
	logZ [solar]	$- {0.16}_{- 0.94}^{1.15}$ ${ - 0.16_{ - 0.94}^{1.15}}$	$- {0.02}_{- 1.2}^{1.3}$ ${ - 0.02_{ - 1.2}^{1.3}}$	$- {0.001}_{- 1.08}^{1.05}$ ${ - 0.001_{ - 1.08}^{1.05}}$
	Rp [RJ]	${0.48}_{- 0.01}^{0.01}$ ${0.48_{ - 0.01}^{0.01}}$	${0.48}_{- 0.01}^{0.03}$ ${0.48_{ - 0.01}^{0.03}}$	${0.48}_{- 0.01}^{0.01}$ ${0.48_{ - 0.01}^{0.01}}$
V1298 Tau c	T_eq [K]	$947_{- 80}^{+ 104}$ ${947_{ - 80}^{ + 104}}$	$921_{- 79}^{+ 113}$ ${921_{ - 79}^{ + 113}}$	$985_{- 105}^{+ 95}$ ${985_{ - 105}^{ + 95}}$
	logκ_cld	${0.26}_{- 0.83}^{+ 1.03}$ ${0.26_{ - 0.83}^{ + 1.03}}$	${0.73}_{- 0.94}^{+ 0.81}$ ${0.73_{ - 0.94}^{ + 0.81}}$	$- {0.11}_{- 0.60}^{+ 0.97}$ ${ - 0.11_{ - 0.60}^{ + 0.97}}$
	C/O	${0.06}_{- 0.05}^{+ 0.2}$ ${0.06_{ - 0.05}^{ + 0.2}}$	${0.07}_{- 0.06}^{+ 0.26}$ ${0.07_{ - 0.06}^{ + 0.26}}$	${0.06}_{- 0.04}^{+ 0.22}$ ${0.06_{ - 0.04}^{ + 0.22}}$
	Mass [M_⊕]	$17_{- 6}^{+ 13}$ ${17_{ - 6}^{ + 13}}$	10 (fixed)	50 (fixed)

Planet	Parameter	Free mass retrieval (ATMO)	Fixed mass (10 M_⊕)	Fixed mass (23 M_⊕)

	logZ [solar]	$- {2.04}_{- 0.59}^{0.69}$ ${ - 2.04_{ - 0.59}^{0.69}}$	$- {1.80}_{- 0.7}^{1.07}$ ${ - 1.80_{ - 0.7}^{1.07}}$	$- {0.86}_{- 0.85}^{1.05}$ ${ - 0.86_{ - 0.85}^{1.05}}$
	R_p [R_⊕]	${0.84}_{- 0.01}^{0.02}$ ${0.84_{ - 0.01}^{0.02}}$	${0.84}_{- 0.01}^{0.03}$ ${0.84_{ - 0.01}^{0.03}}$	${0.84}_{- 0.01}^{0.01}$ ${0.84_{ - 0.01}^{0.01}}$
V1298 Taub	T_eq [K]	$889_{- 180}^{+ 150}$ ${889_{ - 180}^{ + 150}}$	$806_{- 210}^{+ 196}$ ${806_{ - 210}^{ + 196}}$	$824_{- 125}^{+ 137}$ ${824_{ - 125}^{ + 137}}$
	logκ_cld	${1.03}_{- 0.75}^{+ 0.61}$ ${1.03_{ - 0.75}^{ + 0.61}}$	${0.88}_{- 0.98}^{+ 0.68}$ ${0.88_{ - 0.98}^{ + 0.68}}$	${0.25}_{- 0.62}^{+ 1.02}$ ${0.25_{ - 0.62}^{ + 1.02}}$
	C/O	${0.08}_{- 0.06}^{+ 0.18}$ ${0.08_{ - 0.06}^{ + 0.18}}$	${0.05}_{- 0.03}^{+ 0.18}$ ${0.05_{ - 0.03}^{ + 0.18}}$	${0.04}_{- 0.03}^{+ 0.15}$ ${0.04_{ - 0.03}^{ + 0.15}}$
	Mass [M_⊕]	$8_{- 2}^{+ 4}$ ${8_{ - 2}^{ + 4}}$	10 (fixed)	23 (fixed)

Notes. We ran retrievals keeping the planet mass both fixed and as a free parameter in our retrievals. The corresponding posterior distributions were uploaded to Zenodo. A description of the models used for the retrievals is given in Sect. 3.2. The quoted values are median and 68% confidence intervals from the retrieved posteriors.

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