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

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Table 2

Atmospheric composition and temperature constraints obtained for different models used for the retrievals.

Model	CH₄	CO₂	H₂o	CS₂	C₂H₆	DMS	NH₃	T10_mbar/K	log(𝒵)
Canonical	$- {1.86}_{- 0.29}^{+ 0.30}$ $- 1.86_{ - 0.29}^{ + 0.30}$	$- {1.71}_{- 0.66}^{+ 0.38}$ $- 1.71_{ - 0.66}^{ + 0.38}$	$- {1.88}_{- 4.13}^{+ 0.78}$ $- 1.88_{ - 4.13}^{ + 0.78}$	$- {4.74}_{- 1.10}^{+ 0.65}$ $- 4.74_{ - 1.10}^{ + 0.65}$	$- {2.20}_{- 2.01}^{+ 0.87}$ $- 2.20_{ - 2.01}^{ + 0.87}$	(–4.58)	(–4.24)	$323_{- 52}^{+ 58}$ $323_{ - 52}^{ + 58}$	23 698.54
	6.36 σ	3.90 σ	2.11 σ	2.04 σ	2.14 σ	–	–	–

No C₂H₆	$- {1.77}_{- 0.30}^{+ 0.32}$ $- 1.77_{ - 0.30}^{ + 0.32}$	$- {1.89}_{- 0.77}^{+ 0.50}$ $- 1.89_{ - 0.77}^{ + 0.50}$	$- {1.52}_{- 4.07}^{+ 0.53}$ $- 1.52_{ - 4.07}^{ + 0.53}$	$- {4.81}_{- 1.14}^{+ 0.65}$ $- 4.81_{ - 1.14}^{ + 0.65}$	–	$- {5.80}_{- 3.71}^{+ 1.00}$ $- 5.80_{ - 3.71}^{ + 1.00}$	(–4.08)	$335_{- 49}^{+ 58}$ $335_{ - 49}^{ + 58}$	23 697.35
No C₂H₆. DMS	$- {1.70}_{- 0.31}^{+ 0.32}$ $- 1.70_{ - 0.31}^{ + 0.32}$	$- {1.82}_{- 0.76}^{+ 0.47}$ $- 1.82_{ - 0.76}^{ + 0.47}$	$- {1.64}_{- 5.25}^{+ 0.64}$ $- 1.64_{ - 5.25}^{ + 0.64}$	$- {4.78}_{- 1.42}^{+ 0.65}$ $- 4.78_{ - 1.42}^{ + 0.65}$	–	–	(–1.51)	$256_{- 72}^{+ 62}$ $256_{ - 72}^{ + 62}$	23 696.67

Liquid H₂O Aerosols	$- {2.17}_{- 0.50}^{+ 0.37}$ $- 2.17_{ - 0.50}^{ + 0.37}$	$- {1.73}_{- 0.83}^{+ 0.41}$ $- 1.73_{ - 0.83}^{ + 0.41}$	$- {2.15}_{- 1.25}^{+ 0.90}$ $- 2.15_{ - 1.25}^{ + 0.90}$	$- {4.87}_{- 0.92}^{+ 0.68}$ $- 4.87_{ - 0.92}^{ + 0.68}$	$- {1.94}_{- 2.14}^{+ 0.86}$ $- 1.94_{ - 2.14}^{ + 0.86}$	(–4.99)	(–4.58)	$302_{- 59}^{+ 56}$ $302_{ - 59}^{ + 56}$	23 697.38
Ice H₂O Aerosols	$- {2.21}_{- 0.46}^{+ 0.34}$ $- 2.21_{ - 0.46}^{ + 0.34}$	$- {1.74}_{- 0.79}^{+ 0.41}$ $- 1.74_{ - 0.79}^{ + 0.41}$	$- {2.22}_{- 1.26}^{+ 0.92}$ $- 2.22_{ - 1.26}^{ + 0.92}$	$- {4.88}_{- 0.94}^{+ 0.71}$ $- 4.88_{ - 0.94}^{ + 0.71}$	$- {1.79}_{- 1.46}^{+ 0.72}$ $- 1.79_{ - 1.46}^{ + 0.72}$	(–5.15)	(–4.61)	$295_{- 58}^{+ 60}$ $295_{ - 58}^{ + 60}$	23 697.32
Tholin Aerosols	$- {2.05}_{- 0.34}^{+ 0.29}$ $- 2.05_{ - 0.34}^{ + 0.29}$	$- {1.62}_{- 0.57}^{+ 0.33}$ $- 1.62_{ - 0.57}^{ + 0.33}$	$- {1.77}_{- 1.20}^{+ 1.67}$ $- 1.77_{ - 1.20}^{ + 1.67}$	$- {4.75}_{- 0.91}^{+ 0.65}$ $- 4.75_{ - 0.91}^{ + 0.65}$	$- {2.28}_{- 3.73}^{+ 1.07}$ $- 2.28_{ - 3.73}^{ + 1.07}$	(–4.93)	(–4.34)	$313_{- 59}^{+ 59}$ $313_{ - 59}^{ + 59}$	23 698.22

Notes. The models include our canonical atmospheric model, more restricted models with different combinations of C₂H₆ and DMS present, and models with Mie-scattering aerosols instead of parametric clouds and hazes. Also shown are the individual detection significances for the constrained species in the canonical model. The molecular abundances are shown as log-mixing ratios. Values in brackets denote the 2-σ upper limit, corresponding to the 95^th percentile. Dashes indicate molecules which were not present in a particular model.

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