The atmospheric composition of TOI-270 d | Astronomy & Astrophysics (A&A)

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Table 3

Constraints on the cloud parameters, reference pressure, NIRISS-NIRSpec relative offset and inferred mean-molecular weight.

Model	f_c	log(a)	γ	log(P_c/bar)	log(P_ref/bar)	Offset (ppm)	MMW (amu)
Canonical	${0.82}_{- 0.20}^{+ 0.12}$ ${0.82_{ - 0.20}^{ + 0.12}}$	${1.11}_{- 3.29}^{+ 3.44}$ ${1.11_{ - 3.29}^{ + 3.44}}$	$- {11.33}_{- 3.29}^{+ 6.94}$ ${ - 11.33_{ - 3.29}^{ + 6.94}}$	$- {2.09}_{- 0.48}^{+ 0.50}$ ${ - 2.09_{ - 0.48}^{ + 0.50}}$	$- {3.41}_{- 0.24}^{+ 0.25}$ ${ - 3.41_{ - 0.24}^{ + 0.25}}$	${27.8}_{- 12.6}^{+ 12.4}$ ${27.8_{ - 12.6}^{ + 12.4}}$	${4.84}_{- 1.08}^{+ 1.10}$ ${4.84_{ - 1.08}^{ + 1.10}}$
No C₂H₆	${0.86}_{- 0.15}^{+ 0.09}$ ${0.86_{ - 0.15}^{ + 0.09}}$	${0.87}_{- 3.15}^{+ 3.48}$ ${0.87_{ - 3.15}^{ + 3.48}}$	$- {11.23}_{- 5.80}^{+ 6.85}$ ${ - 11.23_{ - 5.80}^{ + 6.85}}$	$- {2.37}_{- 0.43}^{+ 0.37}$ ${ - 2.37_{ - 0.43}^{ + 0.37}}$	$- {3.48}_{- 0.25}^{+ 0.24}$ ${ - 3.48_{ - 0.25}^{ + 0.24}}$	${29.4}_{- 12.9}^{+ 13.1}$ ${29.4_{ - 12.9}^{ + 13.1}}$	${4.10}_{- 1.15}^{+ 1.24}$ ${4.10_{ - 1.15}^{ + 1.24}}$
No C₂H₆, DMS	${0.87}_{- 0.15}^{+ 0.09}$ ${0.87_{ - 0.15}^{ + 0.09}}$	${0.89}_{- 3.15}^{+ 3.47}$ ${0.89_{ - 3.15}^{ + 3.47}}$	$- {11.26}_{- 5.78}^{+ 7.11}$ ${ - 11.26_{ - 5.78}^{ + 7.11}}$	$- {2.43}_{- 0.43}^{+ 0.37}$ ${ - 2.43_{ - 0.43}^{ + 0.37}}$	$- {3.51}_{- 0.23}^{+ 0.24}$ ${ - 3.51_{ - 0.23}^{ + 0.24}}$	${31.7}_{- 13.4}^{+ 13.4}$ ${31.7_{ - 13.4}^{ + 13.4}}$	${4.55}_{- 1.06}^{+ 1.04}$ ${4.55_{ - 1.06}^{ + 1.04}}$

Model	f_c	log(X_aerosol)	log(r_c∕μm)	H_c	log(P_ref/bar)	Offset (ppm)	MMW (amu)

Liquid H₂O Aerosols	${0.66}_{- 0.30}^{+ 0.23}$ ${0.66_{ - 0.30}^{ + 0.23}}$	$- {12.44}_{- 3.63}^{+ 4.54}$ ${ - 12.44_{ - 3.63}^{ + 4.54}}$	$- {0.85}_{- 0.79}^{+ 0.47}$ ${ - 0.85_{ - 0.79}^{ + 0.47}}$	${0.51}_{- 0.21}^{+ 0.25}$ ${0.51_{ - 0.21}^{ + 0.25}}$	$- {3.17}_{- 0.31}^{+ 0.39}$ ${ - 3.17_{ - 0.31}^{ + 0.39}}$	${21.1}_{- 11.4}^{+ 12.2}$ ${21.1_{ - 11.4}^{ + 12.2}}$	${4.59}_{- 1.77}^{+ 1.80}$ ${4.59_{ - 1.77}^{ + 1.80}}$
Ice H₂O Aerosols	${0.64}_{- 0.31}^{+ 0.25}$ ${0.64_{ - 0.31}^{ + 0.25}}$	$- {12.40}_{- 3.76}^{+ 4.57}$ ${ - 12.40_{ - 3.76}^{ + 4.57}}$	$- {0.84}_{- 0.95}^{+ 0.50}$ ${ - 0.84_{ - 0.95}^{ + 0.50}}$	${0.49}_{- 0.20}^{+ 0.23}$ ${0.49_{ - 0.20}^{ + 0.23}}$	$- {3.12}_{- 0.32}^{+ 0.36}$ ${ - 3.12_{ - 0.32}^{ + 0.36}}$	${21.7}_{- 11.6}^{+ 10.7}$ ${21.7_{ - 11.6}^{ + 10.7}}$	${5.35}_{- 1.40}^{+ 1.73}$ ${5.35_{ - 1.40}^{ + 1.73}}$
Titan-like Tholin Aerosols	${0.76}_{- 0.26}^{+ 0.17}$ ${0.76_{ - 0.26}^{ + 0.17}}$	$- {11.25}_{- 3.92}^{+ 3.40}$ ${ - 11.25_{ - 3.92}^{ + 3.40}}$	$- {1.20}_{- 0.94}^{+ 0.66}$ ${ - 1.20_{ - 0.94}^{ + 0.66}}$	${0.56}_{- 0.16}^{+ 0.22}$ ${0.56_{ - 0.16}^{ + 0.22}}$	$- {3.26}_{- 0.26}^{+ 0.03}$ ${ - 3.26_{ - 0.26}^{ + 0.03}}$	${23.4}_{- 12.0}^{+ 12.3}$ ${23.4_{ - 12.0}^{ + 12.3}}$	${5.13}_{- 1.05}^{+ 1.34}$ ${5.13_{ - 1.05}^{ + 1.34}}$

Notes. The above constraints are obtained with the canonical retrieved atmospheric model, more restricted models with various combinations of methyl-bearing species absent, and models with Mie-scattering aerosols instead of parametric clouds and hazes. X_Aerosol denotes the mixing ratio of the given aerosol species in each model. Also shown are the inferred MMW constraints, computed from the retrieved mixing ratio posterior distributions for all species present in each model.

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