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Exo planets with a known atmosphere


Name Radius Planet type Molecules
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-172 b 1.57 hot gas giant Fe, H
WASP-17 b 1.991 hot gas giant C, H2O, K, Na, O I, VO
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-85 Ab 1.24 hot gas giant H, Li
WASP-96 b 1.2 hot gas giant Al2O3, H2O, Mg2SiO4, Na, SiO, TiO2
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 Ba 0.92 huge cold gas giant CH4, CO, CO2, H2O, H2S, K, Na, NH3
GJ 229 c ? cold planet CH4
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 1.141 huge cold gas giant C2H2, CH4, H2O, HCN, NH3
WISE J0458+6434 b 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
EQ J1959-3338 0.85 huge cold gas giant KCl, Na2S
Ross 458 (AB)b 1.07 huge cold gas giant CH4, H2, H2O, K
GJ 1132 b 0.1035 hot planet CO2, H2, N2, O2
TRAPPIST-1 c 0.09421 hot planet CO2, H2O
TRAPPIST-1 d 0.0689 hot planet H2O
TRAPPIST-1 e 0.0819 hot planet CO2, H2O
TRAPPIST-1 f 0.09323 warm planet H2O
TRAPPIST-1 g 0.1005 warm planet H2O
TRAPPIST-1 h 0.0674 terrestrial 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
BR B1222-1221 0.91 huge cold gas giant CrH, Cs I, FeH, H2O, K I, Na I, TiO, VO
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
TOI-270 d 0.19 terrestrial H2O
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
Name Radius Planet type Molecules
HD 102195 b ? hot gas giant CH4, H2O
SDSS J2047-0718 0.96 huge cold gas giant CH4, H2O
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
LT UMa b 1.13 huge cold gas giant CH4, FeH, H, H2O, K, K I, Na, VO
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
WASP-69 b 1.057 hot gas giant CCH, CH4, CO, CO2, H2O, HCN, He, Na, NH3, TiO
kappa And b 1.42 huge cold gas giant H2O
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
Name Radius Planet type Molecules
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
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
PC 0025+0447 1.48 huge cold gas giant CrH, Cs I, FeH, H2O, Hα, K I, Li I, Na I, O I, TiO, VO
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 ? huge cold gas giant H2
IRAS 16253-2429 b ? 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
Rho Oph BD 1 2.8 huge cold gas giant CaH, FeH, H2O, Heα, Hα, K I, Li I, Na I, Rb I, TiO, VO
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
Name Radius Planet type Molecules
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
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-21 b 1.21 hot gas giant Na
WASP-39 b 1.27 hot gas giant CO, CO2, H2O, K, Na, O
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-7 Ab 1.51 hot gas giant Al2O3, CaTiO3, TiO2
HAT-P-32 Ab 1.789 hot gas giant H, H2O, He
Name Radius Planet type Molecules
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
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

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


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