Clouds and chemistry across the brown dwarf T-Y sequence: Insights from JWST atmospheric retrievals

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Volume 707 (March 2026)

A&A, 707 (2026) A92

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Table B.2

Cloud-free BeAR retrieval outcomes for the curated sample of late-T and Y dwarfs, analogous to Table B.1.

Source	SpT	log₁₀ H₂S	log₁₀ K	log₁₀ SO₂	log₁₀ PH₃	log₁₀ NH₃	log₁₀ RCB	γ
SDSSJ1624+00	T6	$- {9.18}_{- 1.78}^{+ 1.79}$ $Mathematical equation: $-9.18_{-1.78}^{+1.79}$$	$- {6.36}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-6.36_{-0.03}^{+0.03}$$	$- {8.37}_{- 2.37}^{+ 1.29}$ $Mathematical equation: $-8.37_{-2.37}^{+1.29}$$	$- {7.45}_{- 0.16}^{+ 0.13}$ $Mathematical equation: $-7.45_{-0.16}^{+0.13}$$	$- {9.44}_{- 1.60}^{+ 1.59}$ $Mathematical equation: $-9.44_{-1.60}^{+1.59}$$	${1.12}_{- 0.08}^{+ 0.09}$ $Mathematical equation: $1.12_{-0.08}^{+0.09}$$	${1.06}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $1.06_{-0.03}^{+0.03}$$
WISEJ1501-40	T6	$- {8.92}_{- 2.11}^{+ 2.09}$ $Mathematical equation: $-8.92_{-2.11}^{+2.09}$$	$- {6.33}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-6.33_{-0.03}^{+0.03}$$	$- {6.24}_{- 1.22}^{+ 0.21}$ $Mathematical equation: $-6.24_{-1.22}^{+0.21}$$	$- {9.25}_{- 1.85}^{+ 1.75}$ $Mathematical equation: $-9.25_{-1.85}^{+1.75}$$	$- {9.05}_{- 1.98}^{+ 1.88}$ $Mathematical equation: $-9.05_{-1.98}^{+1.88}$$	${1.84}_{- 0.16}^{+ 0.16}$ $Mathematical equation: $1.84_{-0.16}^{+0.16}$$	${1.49}_{- 0.33}^{+ 0.33}$ $Mathematical equation: $1.49_{-0.33}^{+0.33}$$
SDSSpJ1346-00	T6.5	$- {9.48}_{- 1.63}^{+ 1.75}$ $Mathematical equation: $-9.48_{-1.63}^{+1.75}$$	$- {6.25}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-6.25_{-0.03}^{+0.03}$$	$- {6.70}_{- 0.23}^{+ 0.16}$ $Mathematical equation: $-6.70_{-0.23}^{+0.16}$$	$- {7.44}_{- 0.24}^{+ 0.20}$ $Mathematical equation: $-7.44_{-0.24}^{+0.20}$$	$- {8.59}_{- 2.22}^{+ 1.56}$ $Mathematical equation: $-8.59_{-2.22}^{+1.56}$$	${0.94}_{- 0.09}^{+ 0.09}$ $Mathematical equation: $0.94_{-0.09}^{+0.09}$$	${1.05}_{- 0.03}^{+ 0.02}$ $Mathematical equation: $1.05_{-0.03}^{+0.02}$$
ULASJ1029+09	T8	$- {9.22}_{- 1.81}^{+ 1.89}$ $Mathematical equation: $-9.22_{-1.81}^{+1.89}$$	$- {6.31}_{- 0.05}^{+ 0.07}$ $Mathematical equation: $-6.31_{-0.05}^{+0.07}$$	$- {6.64}_{- 0.18}^{+ 0.13}$ $Mathematical equation: $-6.64_{-0.18}^{+0.13}$$	$- {7.63}_{- 0.26}^{+ 0.21}$ $Mathematical equation: $-7.63_{-0.26}^{+0.21}$$	$- {6.16}_{- 0.75}^{+ 0.25}$ $Mathematical equation: $-6.16_{-0.75}^{+0.25}$$	${0.02}_{- 0.01}^{+ 0.69}$ $Mathematical equation: $0.02_{-0.01}^{+0.69}$$	${1.16}_{- 0.02}^{+ 0.01}$ $Mathematical equation: $1.16_{-0.02}^{+0.01}$$
WISEJ0247+37	T8	$- {9.13}_{- 1.69}^{+ 1.78}$ $Mathematical equation: $-9.13_{-1.69}^{+1.78}$$	$- {6.20}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-6.20_{-0.03}^{+0.03}$$	$- {7.60}_{- 1.43}^{+ 0.28}$ $Mathematical equation: $-7.60_{-1.43}^{+0.28}$$	$- {10.77}_{- 0.76}^{+ 0.80}$ $Mathematical equation: $-10.77_{-0.76}^{+0.80}$$	$- {6.52}_{- 0.16}^{+ 0.13}$ $Mathematical equation: $-6.52_{-0.16}^{+0.13}$$	${0.36}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $0.36_{-0.05}^{+0.05}$$	${1.17}_{- 0.03}^{+ 0.02}$ $Mathematical equation: $1.17_{-0.03}^{+0.02}$$
WISEJ0430+46	T8	$- {4.31}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-4.31_{-0.05}^{+0.05}$$	$- {8.03}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-8.03_{-0.04}^{+0.04}$$	$- {8.96}_{- 2.10}^{+ 1.61}$ $Mathematical equation: $-8.96_{-2.10}^{+1.61}$$	$- {10.45}_{- 1.04}^{+ 1.09}$ $Mathematical equation: $-10.45_{-1.04}^{+1.09}$$	$- {4.78}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-4.78_{-0.03}^{+0.03}$$	${1.84}_{- 0.16}^{+ 0.16}$ $Mathematical equation: $1.84_{-0.16}^{+0.16}$$	${1.50}_{- 0.33}^{+ 0.34}$ $Mathematical equation: $1.50_{-0.33}^{+0.34}$$
WISEPAJ1959-33	T8	$- {9.59}_{- 1.55}^{+ 1.58}$ $Mathematical equation: $-9.59_{-1.55}^{+1.58}$$	$- {6.33}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-6.33_{-0.04}^{+0.04}$$	$- {10.16}_{- 1.21}^{+ 1.28}$ $Mathematical equation: $-10.16_{-1.21}^{+1.28}$$	$- {7.28}_{- 0.08}^{+ 0.07}$ $Mathematical equation: $-7.28_{-0.08}^{+0.07}$$	$- {6.40}_{- 0.17}^{+ 0.14}$ $Mathematical equation: $-6.40_{-0.17}^{+0.14}$$	${0.70}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $0.70_{-0.06}^{+0.06}$$	${1.12}_{- 0.07}^{+ 0.06}$ $Mathematical equation: $1.12_{-0.07}^{+0.06}$$
WISEPAJ0313+78	T8.5	$- {8.82}_{- 2.17}^{+ 2.11}$ $Mathematical equation: $-8.82_{-2.17}^{+2.11}$$	$- {7.53}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-7.53_{-0.03}^{+0.03}$$	$- {9.41}_{- 1.72}^{+ 1.78}$ $Mathematical equation: $-9.41_{-1.72}^{+1.78}$$	$- {8.77}_{- 2.15}^{+ 1.36}$ $Mathematical equation: $-8.77_{-2.15}^{+1.36}$$	$- {4.53}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-4.53_{-0.03}^{+0.03}$$	${0.72}_{- 0.03}^{+ 0.05}$ $Mathematical equation: $0.72_{-0.03}^{+0.05}$$	${1.32}_{- 0.00}^{+ 0.01}$ $Mathematical equation: $1.32_{-0.00}^{+0.01}$$
WISEAJ2159-48	T9	$- {8.94}_{- 2.05}^{+ 2.12}$ $Mathematical equation: $-8.94_{-2.05}^{+2.12}$$	$- {7.56}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-7.56_{-0.04}^{+0.04}$$	$- {9.41}_{- 1.75}^{+ 1.74}$ $Mathematical equation: $-9.41_{-1.75}^{+1.74}$$	$- {7.43}_{- 0.10}^{+ 0.09}$ $Mathematical equation: $-7.43_{-0.10}^{+0.09}$$	$- {4.39}_{- 0.05}^{+ 0.03}$ $Mathematical equation: $-4.39_{-0.05}^{+0.03}$$	${0.80}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $0.80_{-0.05}^{+0.05}$$	${1.34}_{- 0.00}^{+ 0.00}$ $Mathematical equation: $1.34_{-0.00}^{+0.00}$$
WISEJ2102-44	T9	$- {8.87}_{- 2.09}^{+ 2.11}$ $Mathematical equation: $-8.87_{-2.09}^{+2.11}$$	$- {7.46}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-7.46_{-0.04}^{+0.04}$$	$- {8.42}_{- 2.40}^{+ 2.09}$ $Mathematical equation: $-8.42_{-2.40}^{+2.09}$$	$- {7.02}_{- 0.77}^{+ 0.20}$ $Mathematical equation: $-7.02_{-0.77}^{+0.20}$$	$- {4.41}_{- 0.03}^{+ 0.03}$ $Mathematical equation: $-4.41_{-0.03}^{+0.03}$$	${0.61}_{- 0.07}^{+ 0.08}$ $Mathematical equation: $0.61_{-0.07}^{+0.08}$$	${1.31}_{- 0.00}^{+ 0.00}$ $Mathematical equation: $1.31_{-0.00}^{+0.00}$$
WISEJ2209+27	Y0	$- {9.09}_{- 1.95}^{+ 2.04}$ $Mathematical equation: $-9.09_{-1.95}^{+2.04}$$	$- {8.92}_{- 2.02}^{+ 1.99}$ $Mathematical equation: $-8.92_{-2.02}^{+1.99}$$	$- {9.50}_{- 1.64}^{+ 1.55}$ $Mathematical equation: $-9.50_{-1.64}^{+1.55}$$	$- {10.16}_{- 1.23}^{+ 1.21}$ $Mathematical equation: $-10.16_{-1.23}^{+1.21}$$	$- {4.56}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-4.56_{-0.05}^{+0.05}$$	${1.64}_{- 0.07}^{+ 0.08}$ $Mathematical equation: $1.64_{-0.07}^{+0.08}$$	${1.58}_{- 0.35}^{+ 0.27}$ $Mathematical equation: $1.58_{-0.35}^{+0.27}$$
WISEJ0359-54	Y0	$- {8.24}_{- 2.47}^{+ 2.56}$ $Mathematical equation: $-8.24_{-2.47}^{+2.56}$$	$- {7.69}_{- 0.07}^{+ 0.06}$ $Mathematical equation: $-7.69_{-0.07}^{+0.06}$$	$- {9.58}_{- 1.59}^{+ 1.53}$ $Mathematical equation: $-9.58_{-1.59}^{+1.53}$$	$- {7.78}_{- 0.11}^{+ 0.10}$ $Mathematical equation: $-7.78_{-0.11}^{+0.10}$$	$- {4.61}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-4.61_{-0.05}^{+0.05}$$	${1.52}_{- 0.06}^{+ 0.05}$ $Mathematical equation: $1.52_{-0.06}^{+0.05}$$	${1.77}_{- 0.09}^{+ 0.11}$ $Mathematical equation: $1.77_{-0.09}^{+0.11}$$
WISEJ0734-71	Y0	$- {8.78}_{- 2.16}^{+ 2.24}$ $Mathematical equation: $-8.78_{-2.16}^{+2.24}$$	$- {8.21}_{- 0.08}^{+ 0.09}$ $Mathematical equation: $-8.21_{-0.08}^{+0.09}$$	$- {9.56}_{- 1.65}^{+ 1.68}$ $Mathematical equation: $-9.56_{-1.65}^{+1.68}$$	$- {7.44}_{- 0.17}^{+ 0.12}$ $Mathematical equation: $-7.44_{-0.17}^{+0.12}$$	$- {4.39}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-4.39_{-0.04}^{+0.04}$$	${0.81}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $0.81_{-0.05}^{+0.05}$$	${1.40}_{- 0.01}^{+ 0.01}$ $Mathematical equation: $1.40_{-0.01}^{+0.01}$$
WISEJ1206+84	Y0	$- {4.34}_{- 1.40}^{+ 0.21}$ $Mathematical equation: $-4.34_{-1.40}^{+0.21}$$	$- {8.28}_{- 0.06}^{+ 0.07}$ $Mathematical equation: $-8.28_{-0.06}^{+0.07}$$	$- {9.38}_{- 1.76}^{+ 1.80}$ $Mathematical equation: $-9.38_{-1.76}^{+1.80}$$	$- {6.96}_{- 0.10}^{+ 0.09}$ $Mathematical equation: $-6.96_{-0.10}^{+0.09}$$	$- {4.15}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $-4.15_{-0.06}^{+0.06}$$	${0.42}_{- 0.04}^{+ 0.05}$ $Mathematical equation: $0.42_{-0.04}^{+0.05}$$	${1.33}_{- 0.01}^{+ 0.01}$ $Mathematical equation: $1.33_{-0.01}^{+0.01}$$
WISEPCJ2056+14	Y0	$- {8.65}_{- 2.30}^{+ 2.35}$ $Mathematical equation: $-8.65_{-2.30}^{+2.35}$$	$- {8.18}_{- 0.11}^{+ 0.18}$ $Mathematical equation: $-8.18_{-0.11}^{+0.18}$$	$- {9.70}_{- 1.56}^{+ 1.62}$ $Mathematical equation: $-9.70_{-1.56}^{+1.62}$$	$- {7.05}_{- 0.12}^{+ 0.10}$ $Mathematical equation: $-7.05_{-0.12}^{+0.10}$$	$- {4.32}_{- 0.08}^{+ 0.06}$ $Mathematical equation: $-4.32_{-0.08}^{+0.06}$$	${0.73}_{- 0.06}^{+ 0.05}$ $Mathematical equation: $0.73_{-0.06}^{+0.05}$$	${1.41}_{- 0.01}^{+ 0.02}$ $Mathematical equation: $1.41_{-0.01}^{+0.02}$$
WISEJ0825+28	Y0.5	$- {9.04}_{- 1.92}^{+ 2.00}$ $Mathematical equation: $-9.04_{-1.92}^{+2.00}$$	$- {9.85}_{- 1.40}^{+ 1.24}$ $Mathematical equation: $-9.85_{-1.40}^{+1.24}$$	$- {9.23}_{- 1.83}^{+ 1.53}$ $Mathematical equation: $-9.23_{-1.83}^{+1.53}$$	$- {10.38}_{- 1.07}^{+ 1.13}$ $Mathematical equation: $-10.38_{-1.07}^{+1.13}$$	$- {4.71}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-4.71_{-0.05}^{+0.05}$$	${1.25}_{- 0.05}^{+ 0.06}$ $Mathematical equation: $1.25_{-0.05}^{+0.06}$$	${1.95}_{- 0.05}^{+ 0.03}$ $Mathematical equation: $1.95_{-0.05}^{+0.03}$$
WISEPCJ1405+55	Y0.5	$- {6.16}_{- 3.93}^{+ 1.28}$ $Mathematical equation: $-6.16_{-3.93}^{+1.28}$$	$- {8.41}_{- 1.48}^{+ 0.27}$ $Mathematical equation: $-8.41_{-1.48}^{+0.27}$$	$- {10.04}_{- 1.28}^{+ 1.34}$ $Mathematical equation: $-10.04_{-1.28}^{+1.34}$$	$- {9.40}_{- 1.65}^{+ 0.95}$ $Mathematical equation: $-9.40_{-1.65}^{+0.95}$$	$- {4.60}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-4.60_{-0.04}^{+0.04}$$	${1.04}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $1.04_{-0.04}^{+0.04}$$	${1.57}_{- 0.03}^{+ 0.04}$ $Mathematical equation: $1.57_{-0.03}^{+0.04}$$
WISEJ0535-75	Y1	$- {4.72}_{- 0.15}^{+ 0.13}$ $Mathematical equation: $-4.72_{-0.15}^{+0.13}$$	$- {7.75}_{- 0.18}^{+ 0.13}$ $Mathematical equation: $-7.75_{-0.18}^{+0.13}$$	$- {9.06}_{- 1.97}^{+ 1.47}$ $Mathematical equation: $-9.06_{-1.97}^{+1.47}$$	$- {10.58}_{- 0.94}^{+ 1.00}$ $Mathematical equation: $-10.58_{-0.94}^{+1.00}$$	$- {4.83}_{- 0.05}^{+ 0.05}$ $Mathematical equation: $-4.83_{-0.05}^{+0.05}$$	${0.98}_{- 0.08}^{+ 0.09}$ $Mathematical equation: $0.98_{-0.08}^{+0.09}$$	${1.66}_{- 0.09}^{+ 0.13}$ $Mathematical equation: $1.66_{-0.09}^{+0.13}$$
WISEPAJ1541-22	Y1	$- {4.94}_{- 4.29}^{+ 0.46}$ $Mathematical equation: $-4.94_{-4.29}^{+0.46}$$	$- {8.02}_{- 0.39}^{+ 0.16}$ $Mathematical equation: $-8.02_{-0.39}^{+0.16}$$	$- {9.67}_{- 1.52}^{+ 1.62}$ $Mathematical equation: $-9.67_{-1.52}^{+1.62}$$	$- {10.36}_{- 1.10}^{+ 1.14}$ $Mathematical equation: $-10.36_{-1.10}^{+1.14}$$	$- {4.56}_{- 0.07}^{+ 0.07}$ $Mathematical equation: $-4.56_{-0.07}^{+0.07}$$	${1.39}_{- 0.07}^{+ 0.08}$ $Mathematical equation: $1.39_{-0.07}^{+0.08}$$	${1.97}_{- 0.04}^{+ 0.02}$ $Mathematical equation: $1.97_{-0.04}^{+0.02}$$
CWISEPJ1047+54	Y1	$- {8.80}_{- 2.16}^{+ 2.19}$ $Mathematical equation: $-8.80_{-2.16}^{+2.19}$$	$- {10.64}_{- 0.92}^{+ 0.97}$ $Mathematical equation: $-10.64_{-0.92}^{+0.97}$$	$- {9.46}_{- 1.72}^{+ 1.64}$ $Mathematical equation: $-9.46_{-1.72}^{+1.64}$$	$- {10.00}_{- 1.36}^{+ 1.41}$ $Mathematical equation: $-10.00_{-1.36}^{+1.41}$$	$- {4.02}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $-4.02_{-0.06}^{+0.06}$$	${0.52}_{- 0.03}^{+ 0.04}$ $Mathematical equation: $0.52_{-0.03}^{+0.04}$$	${1.39}_{- 0.01}^{+ 0.01}$ $Mathematical equation: $1.39_{-0.01}^{+0.01}$$
WISEAJ2354+02	Y1	$- {8.77}_{- 2.15}^{+ 2.22}$ $Mathematical equation: $-8.77_{-2.15}^{+2.22}$$	$- {10.09}_{- 1.26}^{+ 1.22}$ $Mathematical equation: $-10.09_{-1.26}^{+1.22}$$	$- {9.81}_{- 1.46}^{+ 1.50}$ $Mathematical equation: $-9.81_{-1.46}^{+1.50}$$	$- {8.04}_{- 0.23}^{+ 0.15}$ $Mathematical equation: $-8.04_{-0.23}^{+0.15}$$	$- {4.39}_{- 0.04}^{+ 0.04}$ $Mathematical equation: $-4.39_{-0.04}^{+0.04}$$	${1.56}_{- 0.06}^{+ 0.05}$ $Mathematical equation: $1.56_{-0.06}^{+0.05}$$	${1.95}_{- 0.07}^{+ 0.04}$ $Mathematical equation: $1.95_{-0.07}^{+0.04}$$
CWISEPJ1446-23	Y1	$- {8.65}_{- 2.25}^{+ 2.35}$ $Mathematical equation: $-8.65_{-2.25}^{+2.35}$$	$- {9.94}_{- 1.37}^{+ 1.32}$ $Mathematical equation: $-9.94_{-1.37}^{+1.32}$$	$- {9.31}_{- 1.79}^{+ 1.75}$ $Mathematical equation: $-9.31_{-1.79}^{+1.75}$$	$- {10.44}_{- 1.04}^{+ 1.11}$ $Mathematical equation: $-10.44_{-1.04}^{+1.11}$$	$- {4.20}_{- 0.07}^{+ 0.07}$ $Mathematical equation: $-4.20_{-0.07}^{+0.07}$$	${1.46}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $1.46_{-0.06}^{+0.06}$$	${1.93}_{- 0.07}^{+ 0.05}$ $Mathematical equation: $1.93_{-0.07}^{+0.05}$$

Notes. Listed are the following parameters: Spectral type (SpT) and molecular volume mixing ratios for hydrogen sulfide (log₁₀ H₂S), potassium (log₁₀ K), sulfur dioxide (log₁₀ SO₂), phosphine (log₁₀ PH₃), and ammonia (log₁₀ NH₃). Additionally, the radiative-convective boundary (log₁₀ RCB) and adiabatic index (γ) are recorded.

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