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Exo planets with a known atmosphere


Name Radius Planet type Molecules
WASP-96 b 1.2 hot gas giant Al2O3, H2O, Mg2SiO4, Na, SiO, TiO2
WASP-172 b 1.57 hot gas giant Fe, H
WASP-43 b 1.036 large hot gas giant AlO, C, CH4, CO, CO2, H, H2O, K, KCl, NH3, O I, SiO, TiO2
WASP-48 b 1.67 hot gas giant He
WASP-77 Ab 1.21 hot gas giant 13CO, CO, H2O
TOI-1518 b 1.878 hot gas giant Cr I, Fe I, Fe II, Ni I
WASP-17 b 1.991 hot gas giant C, H2O, K, Na, O I, VO
WASP-85 Ab 1.24 hot gas giant H, Li
WISE J0855-0714 0.9 huge cold gas giant CH4, CO, CO2, H2O, H2S, NH3, PH3
GJ 876 c ? cold planet CH4, H, OH
2MASS J0939-2448 1.11 huge cold gas giant KCl, Na2S
2MASS J0415-0935 0.855 huge cold gas giant CH4, CO, CO2, H2O, H2S, NH3, PH3
GJ 229 c ? cold planet CH4
GJ 229 Ba 0.92 huge cold gas giant CH4, CO, CO2, H2O, H2S, K, Na, NH3
GJ 570 D 0.855 huge cold gas giant NH3
SIMP J0136+09 1.2 huge cold gas giant CH4, CO, CO2, CrH, Fe, FeH, H2O, Mg2SiO4, NH3, SiO
GJ 581 c ? terrestrial CH4, H, OH
2MASS J0559-1404 0.97 huge cold gas giant CH4, FeH, H2, H2O
LTT 1445 Ab 0.116 hot planet H2O, NH3
CWISE J105512.11+544328.3 ? large cold gas giant CH4, H2O, NH3
GJ 486 b 0.11643 hot planet H2O
WISE J1118+3125 ? huge cold gas giant CH4, H2O
WISE J1738+2732 1.14 huge cold gas giant 15NH3, CH4, CO, CO2, H2O, NH3
2MASS J0355+1133 1.22 huge cold gas giant CO
WISE J0458+6434 b 1.141 huge cold gas giant C2H2, CH4, H2O, HCN, NH3
WISE J0458+6434 1.141 huge cold gas giant C2H2, CH4, H2O, HCN, NH3
WISE J1217+1626 b 0.96 huge cold gas giant CH4, H2, H2O
GJ 436 b 0.32519 small hot gas planet CH4, CO, CO2, H, H2O, Si
CFBDS J2139+0220 1.14 huge cold gas giant C, CH4, CO, CO2, CrH, Fe, FeH, H2O, Mg2SiO4, NH3, O, SiO
L 98-59 b 0.0758 hot planet CH4, H2, H2O
Name Radius Planet type Molecules
2MASS J1624+0029 0.94 huge cold gas giant CH4, H2O
WISE J1828+2650 b 0.97 large cold gas giant NH3
Ross 458 (AB)b 1.07 huge cold gas giant CH4, H2, H2O, K
EQ J1959-3338 0.85 huge cold gas giant KCl, Na2S
GJ 1132 b 0.1035 hot planet CO2, H2, N2, O2
TRAPPIST-1 g 0.1005 warm planet H2O
TRAPPIST-1 d 0.0689 hot planet H2O
TRAPPIST-1 f 0.09323 warm planet H2O
TRAPPIST-1 h 0.0674 terrestrial H2O
TRAPPIST-1 c 0.09421 hot planet CO2, H2O
TRAPPIST-1 e 0.0819 hot planet CO2, H2O
TRAPPIST-1 b 0.09689 hot planet H2O
55 Cnc Ae 0.1737 small hot gas planet Ca, Ca+, CCH, Fe, Fe+, H2O, HCN, K, Mg, N, NH3
VHS 1256-1257 b 1.25 huge cold gas giant C, CH4, CO, CO2, H2O, K, Na, O
GJ 1214 b 0.24463 small hot gas planet He
51 Peg b 1.9 hot gas giant CO, H2O
GJ 758 b ? huge cold gas giant CH4
tau Boo Ab 1.06 large hot gas giant CO, H2O
WISEA J1534-1043 0.79 huge cold gas giant CH4, H2O, SiH4
GJ 504 b 0.96 large cold gas giant CH4, NH3
HD 189733 Ab 1.138 hot gas giant C, Ca, CH4, CO, CO2, Fe I, H, H2O, H2S, HCN, He, K, Na, NH3, O, O I, Sc, Ti+
beta Pic b 1.65 huge cold gas giant C, CO, H, H2O, N, O I
HD 97658 b 0.20047 small warm gas planet C, O
2MASS J0949-1545 0.96 huge cold gas giant CH4
CFBDSIR J145829+101343 b ? huge cold gas giant CH4
PSO J318.5-22 1.41 large cold gas giant SiO
WD 1856+534 Ab 0.928 hot planet CH4, CO, CO2, H2O
HD 179949 b 1.05 hot planet CO, H2O
HD 102195 b ? hot gas giant CH4, H2O
SDSS J2047-0718 0.96 huge cold gas giant CH4, H2O
Name Radius Planet type Molecules
51 Eri Ab 1.11 large cold gas giant CH4, H2O
GJ 3470 b 0.38826 small hot gas planet CH4, CO2, H, H2O, He, SO2
GD 165 b 0.83 huge cold gas giant CO, CrH, FeH, H2O, K, Na, VO
J0438 ? huge cold gas giant Ar+, C2H2, CO, CO2, H2, H2O, HCN, Ne+
2MASS J0856-1342 ? huge cold gas giant Ca, CO, H2O, HF, Na, Ti
2MASS J1115+1937 1.5 huge cold gas giant H, He
HAT-P-11 b 0.389 small hot gas planet C, H, H2O, He
K2-18 b 0.211 small cold gas planet CH4, CO, CO2, H2O, NH3
HD 203030 Ab 1.3 huge cold gas giant H2O
HR 8799 b 1.2 large cold gas giant CH4, CO, H2O
HR 8799 c 1.3 huge cold gas giant CO, H2O
TOI-1430 b 0.1766 warm planet He
K2-3 d 0.135 cold planet H2O
K2-3 c 0.165 planet H2O
K2-3 b 0.194 terrestrial H2O
TOI-674 b 0.4693 small hot gas planet H2O
HD 209458 b 1.38 hot gas giant C, Ca, CCH, CH4, CO, CO2, Fe, Fe+, H, H2, H2O, HCN, He, K, Mg, Mn, Na, NH3, O2, O I, Sc, TiO, V, VO
HD 984 b 1.6 huge cold gas giant C, CO, O I
2MASS J0103-5515 (AB)b 1.54 huge cold gas giant H
GU Psc b 1.35 huge cold gas giant CH4
HD 187123 b ? hot gas giant H2O
kappa And b 1.42 huge cold gas giant H2O
WASP-69 b 1.057 hot gas giant CCH, CH4, CO, CO2, H2O, HCN, He, Na, NH3, TiO
PZ Tel b 2.42 huge cold gas giant H
HD 80606 b 1.032 large cold gas giant CH4, CO2, H2O, K
TWA 28 2.738 huge cold gas giant Al, Ca, CO, Fe, H2O, HF, K, Mg, Na, Ti
WASP-80 b 0.952 hot gas giant CCH, CH4, CO, CO2, H, H2O, HCN, He, K, Na, NH3
2MASS J2236+4751 b ? huge cold gas giant CO, H2O
2M1207 Ab 1.4 large cold gas giant CH4, CO, Fe, H2O, He, K, Mg, Na, SiO2
2M1207 A 3.5 huge cold gas giant CO, Fe, H2O, K, Mg, Na
Name Radius Planet type Molecules
WASP-107 b 0.94 small hot gas planet CCH, CH4, CO, CO2, H2O, H2S, HCN, He, NH3, PH3, SiO, SO, SO2
HD 149026 b 0.74 hot gas giant Fe, H2O, Ti
HD 106906 (AB) b ? huge cold gas giant C, CO, H2O, O
TYC 8998-760-1 b 3 huge cold gas giant 13CO, CO, H2O
KELT-11 Ab 1.3 small hot gas planet H2O, Na
WASP-189 Ab 1.619 hot gas giant Cr, Fe, Fe+, Mg, Mn, Ti, Ti+, TiO, V
WASP-18 Ab 1.165 huge hot gas giant CO, H, H2O
2MASS J1200-7845 4.6 huge cold gas giant Ca, CO, H2O, HF, Na, Ti
K2-309 Ab 0.8788 small gas planet C, CH4, CO, CO2, H, H2O, He, OCS, O I, SO2
WASP-166 b 0.6155 small hot gas planet Na
WASP-33 Ab 1.603 large hot gas giant AlO, Ca+, CO, Fe, Fe I, H, H2O, Ni, OH, Si, SiO, Ti, Ti+, V
WASP-74 b 1.248 hot gas giant Al, TiO, VO
IRAS 16253-2429 b ? huge cold gas giant H2
IRAS 16253-2429 ? huge cold gas giant H2
KELT-23 Ab 1.29 hot gas giant H2O
HIP 67522 b 0.897 small warm gas planet CO, CO2, H2O, H2S, SO2
KELT-7 b 1.293 hot gas giant H, H2O
HAT-P-26 b 0.57 small hot gas planet CH4, CO, CO2, CrH, H2O, ScH, TiH
DH Tau b 2.6 huge cold gas giant 13CO, CO, H2O
ROXs 42B (AB)b 2.1 huge cold gas giant CO, H2O, K
HAT-P-54 b 0.944 hot gas giant H2S
KELT-20 Ab 1.83 large hot gas giant Ca+, CO, Cr II, Fe, Fe+, Fe I, Fe II, H, H2O, Mg, Na, NI, Si, TiO
HAT-P-1 Bb 1.319 hot gas giant H2O, K, Na
WASP-52 b 1.27 hot gas giant H, H2O, K, Na
GQ Lup Ab 4 huge cold gas giant CO, H2O
PPL 15 b ? huge cold gas giant Li
HAT-P-12 b 0.949 hot gas giant CO, CO2, H2O, Na
ISO-Oph 200 ? huge cold gas giant CO, CS, H2CO, HCN
1RXS 1609 b 1.7 huge cold gas giant CO, H2O, K
XO-2N b 0.973 hot gas giant K, Na
Name Radius Planet type Molecules
IRAS 15398-3359 ? large cold gas giant CCH, H2CO, SO
8 Umi b ? cold planet C, Mg, N, Y
WASP-127 Ab 1.293 small hot gas planet CO, H2O, K, Li, Na
HAT-P-18 Ab 0.947 small hot gas planet H2O, He
HD 76920 b ? cold planet H
MASCARA-1 b 1.5 large hot gas giant CO, Cr, Fe, Fe I, H2O, Ti
WASP-49 Ab 1.198 hot gas giant K, Na
Cha J1107-7626 2.8 huge cold gas giant C2H2, CH4
WASP-76 Ab 1.83 hot gas giant Al2O3, Ba, Ca, Ca+, CH4, Fe, Fe I, H2O, HCN, He, Li, Mg, Mg2SiO4, Na, Ni, OH, S2, SiO, SO2, Ti, TiO, VO
XO-1 b 1.184 cold gas giant C, O I
KELT-9 Ab 1.936 large hot gas giant Ba, Ca, Cr, Cr II, Fe, Fe+, FeH, Fe II, H, H2, K, Mg, Na, NI, O, Sc, Sc II, Sr, Tb, Ti, Ti+, TiO, V, VO, Y II
WASP-20 Ab 1.459 hot gas giant H2O
WASP-39 b 1.27 hot gas giant CO, CO2, H2O, K, Na, O
WASP-21 b 1.21 hot gas giant Na
KELT-8 b 1.86 hot gas giant H2O
K2-22 Ab 0.223 hot gas giant Na
HATS-5 b 0.912 hot gas giant H2O
TOI-2109 b 1.347 large cold gas giant CO, Fe I
WASP-19 Ab 1.41 hot gas giant Al2O3, C, C2H2, CH4, CO, CO2, H2O, O I, TiO
WASP-121 b 1.865 hot gas giant Ba, C, Ca, Ca+, CO, Cr, Fe, Fe+, Fe I, Fe II, H, H2O, K, Li, Mg, Na, Ni, NI, O, Sc II, SH, SiO, Sr, Ti, TiO, V, VO
WASP-98 Ab 1.1 hot gas giant TiO, VO
WASP-5 b 1.171 hot gas giant Ag
WASP-6 b 1.224 hot gas giant H2O, K, Na
HAT-P-32 Ab 1.789 hot gas giant H, H2O, He
HAT-P-7 Ab 1.51 hot gas giant Al2O3, CaTiO3, TiO2
HAT-P-70 b 1.87 large hot gas giant Ca, Cr, Fe I, H, Mg, Na, V
Kepler-167 Ae 0.9064 large cold gas giant CH4, H2O, NH3
HAT-P-41 Ab 1.685 hot gas giant Al, C, Na, O I, Ti, TiO, V
S Ori 70 ? large cold gas giant CrH, FeH, H2O
G192.32-11.88 b ? huge cold gas giant CO, H2, H2CO, NH2
Name Radius Planet type Molecules
WASP-31 b 1.537 hot gas giant CrH, K
WASP-178 b 1.94 hot gas giant SiO
WASP-12 Ab 1.9 hot gas giant C, Ca, CH4, CO, CO2, Fe, H, H2, H2O, HCN, He, Mg, Na, Ni, O I, SiO, Ti, TiO, VO
Ser-emb 16 ? huge cold gas giant HCN
WASP-103 b 1.528 hot gas giant H2, H2O, K, Na
HAT-P-55 b 1.182 hot gas giant Na
Kepler-1520 b ? hot planet Na

157 hits in total. Data kindly provided by www.exoplanet.eu, last updated 11 Sep 2025.


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