Many exoplanets have now been identified, and astronomers have been able to identify molecules in some of their atmospheres. The Extrasolar Planet Encylopedia (EPE) is an excellent technical resource about exoplanets. As of December 2021, it catalogs over 4900 exoplanets. The NASA Exoplanet Catalog is a more general interest catalog. Where available, links to Wikipedia, EPE, and NASA entries are given below.

Italics indicates tentative detections (beyond the fact that all detections need confirmation).

Like all of the pages on this website, this is a work in progress.


EXOPLANET
MOLECULES (click for citation)
EXOPLANET DISCOVERY CITATION
CI Tau b  EPE  NASA
CO
A Candidate Young Massive Planet in Orbit around the Classical T Tauri Star CI Tau
C. M. Johns-Krull, J. N. McLane, L. Prato, C. J. Crockett, D. T. Jaffe, P. M. Hartigan, C. A. Beichman, N. I. Mahmud, W. Chen, B. A. Skiff, P. Wilson Cauley, J. A. Jones, and G. N. Mace. ApJ 826, 206 (2016)
GJ 1132 b  EPE  NASA
HCN   CH4
A rocky planet transiting a nearby low-mass star
Z. K. Berta-Thompson, J. Irwin, D. Charbonneau, E. R. Newton, J. A. Dittmann, N. Astudillo-Defru, X. Bonfils, M. Gillon, E. Jehin, A. A. Stark, B. Stalder, F. Bouchy, X. Delfosse, T. Forveille, C. Lovis, M. Mayor, V. Neves, F. Pepe, N. C. Santos, S. Udry, and A. Wünsche. Nature 527:204 (2015)
HAT-P-65b  EPE  NASA
TiO
HAT-P-65b and HAT-P-66b: Two Transiting Inflated Hot Jupiters and Observational Evidence for the Reinflation of Close-In Giant Planets
J. D. Hartman, G. Á. Bakos, W. Bhatti, K. Penev, A. Bieryla, D. W. Latham, G. Kovács, G. Torres, Z. Csubry, M. de Val-Borro. AJ 152, 182 (2016).
HD 102195b  EPE  NASA
H2O   CH4
The First Extrasolar Planet Discovered with a New-Generation High-Throughput Doppler Instrument
J. Ge, J. van Eyken, S. Mahadevan, C. DeWitt, S. R. Kane, R. Cohen, A. Vanden Heuvel, S. W. Fleming, P. Guo, G. W. Henry, D. P. Schneider, L. W. Ramsey, R. A. Wittenmyer, M. End, W. D. Cochran, E. B. Ford, E. L. Martín, G. Israelian, J. Valenti, and D. Montes. ApJ 648:683 (2006).
HD 189733b  EPE  NASA
CO   H2O(1)   H2O(2)   H2O(3)
H2O(4)
ELODIE metallicity-biased search for transiting Hot Jupiters. II. A very hot Jupiter transiting the bright K star HD 189733
F. Bouchy, S. Udry, M. Mayor, C. Moutou, F. Pont, N. Iribarne, R. Da Silva, S. Ilovaisky, D. Queloz, N. C. Santos, D. Ségransan, and S. Zucker. A&A 444:L15 (2005).
HD 209458b  EPE  NASA
H2O   CH4   CO2   H+
3
(nd)

NH3   HCN   C2H2
A Transiting "51 Peg-like" Planet
G. W. Henry, G. W. Marcy, R. P. Butler, and S. S. Vogt. ApJ 529, L41 (2000).
Detection of Planetary Transits Across a Sun-like Star
D. Charbonneau, T. M. Brown, D. W. Latham, and M. Mayor. ApJ 529, L45 (2000),
KELT-20b  EPE  NASA
(MASCARA-2b)
H2O   CO  
MASCARA-2 b - A hot Jupiter transiting the mV = 7.6 A-star HD 185603
G. J. J. Talens, A. B. Justesen, S. Albrecht, J. McCormac, V. Van Eylen, G. P. P. L. Otten, F. Murgas, E. Palle, D. Pollacco, R. Stuik, A.-L. Lesage, F. Grundahl, M. Fredslund Andersen, V. Antoci, and I. A. G. Snellen. A&A 612:A57 (2018).
TOI-1431b  EPE  NASA
(MASCARA-5b)
TiO (nd)   VO (nd)
TOI-1431b/MASCARA-5b: A Highly Irradiated Ultra-Hot Jupiter Orbiting One of the Hottest & Brightest Known Exoplanet Host Stars
B. C. Addison, E. Knudstrup, I. Wong, G. Hebrard, P. Dorval, I. Snellen, S. Albrecht, A. Bello-Arufe, J.-M. Almenara, I. Boisse, X. Bonfils, S. Dalal, O. Demangeon, S. Hoyer, F. Kiefer, N. C. Santos, G. Nowak, R. Luque, M. Stangret, E. Palle, R. Tronsgaard, V. Antoci, L. A. Buchhave, M. N. Gunther, T. Daylan, F. Murgas, H. Parviainen, E. Esparza-Borges, N. Crouzet, N. Narita, A. Fukui, K. Kawauchi, N. Watanabe, M. Rabus, M. C. Johnson, G. P. P. L. Otten, G. J. Talens, S. H. C. Cabot, D. A. Fischer, F. Grundahl, M. Fredslund Andersen, J. Jessen-Hanse, P. Palle, A. Shporer, D. R. Ciardi, J. T. Clark, R. A. Wittenmyer, D. J. Wright, J. Horner, K. A. Collins, E. L. N. Jensen, J. F. Kielkopf, R. P. Schwarz, G. Srdoc, M. Yilmaz, H. V. Senavci, B. Diamond, D. Harbeck, T. D. Komacek, J. C. Smith, S. Wang, J. D. Eastman, K. G. Stassun, . W. Latham, R. Vanderspek, S. Seager, J. N. Winn, J. M. Jenkins, D. R. Louie, L. G. Bouma, J. D. Twicken, A. M. Levine, and B. McLean. AJ 162:292 (2021).
TYC 8998-760-1 b EPE NASA
H2O   CO   13CO
The Young Suns Exoplanet Survey: Detection of a wide-orbit planetary-mass companion to a solar-type Sco-Cen member
A. J. Bohn, M. A. Kenworthy, C. Ginski, C. F. Manara, M. J. Pecaut, J. de Boer, C. U. Keller, E. E. Mamajek, T. Meshkat, M. Reggiani, K. O. Todorov, and F. Snik. MNRAS 492:431-443 (2020).
WASP-19b  EPE  NASA
H2O   TiO
WASP-19b: The Shortest Period Transiting Exoplanet Yet Discovered
L. Hebb, A. Collier-Cameron, A. H. M. J. Triaud, T. A. Lister, B. Smalley, P. F. L. Maxted, C. Hellier, D. R. Anderson, D. Pollacco, M. Gillon, D. Queloz, R.G. West, S. Bentley, B. Enoch, C. A. Haswell, K. Horne, M. Mayor, F. Pepe, D. Segransan, I. Skillen, S. Udry, and P. J. Wheatley. ApJ 708:224 (2010).
WASP-31b  EPE  NASA
CrH   H2O
WASP-31b: a low-density planet transiting a metal-poor, late-F-type dwarf star
D. R. Anderson, A. Collier Cameron, C. Hellier, M. Lendl, T. A. Lister, P. F. L. Maxted, D. Queloz, B. Smalley, A. M. S. Smith, A. H. M. J. Triaud, R. G. West, D. J. A. Brown, M. Gillon, F. Pepe, D. Pollacco, D. Ségransan, R. A. Street, and S. Udry. A&A 531:A60 (2011).
WASP-33b  EPE  NASA
TiO (disputed) (new evidence)
OH   H2O
Line-profile tomography of exoplanet transits. II. A gas-giant planet transiting a rapidly rotating A5 star
A. Collier Cameron, E. Guenther, B. Smalley, I. McDonald, L. Hebb, J. Andersen, T. Augusteijn, S. C. C. Barros, D. J. A. Brown, W. D. Cochran, M. Endl, S. J. Fossey, M. Hartmann, P. F. L. Maxted, D. Pollacco, I. Skillen, J. Telting, I. P. Waldmann, and R. G. West. MNRAS 407:507-514 (2010)
WASP-76b  EPE  NASA
TiO (nd)   VO (nd)   ZrO (nd)
OH
Three irradiated and bloated hot Jupiters: WASP-76b, WASP-82b, and WASP-90b
R. G. West, C. Hellier, J.-M. Almenara, D. R. Anderson, S. C. C. Barros, F. Bouchy, D. J. A. Brown, A. Collier Cameron, M. Deleui, L. Delrez, A. P. Doyle, F. Faedi, A. Fumel, M. Gillon, Y. Gómez Maqueo Chew, G. Hébrard, E. Jehin, M. Lendl, P. F. L. Maxted, F. Pepe, D. Pollacco, D. Queloz, D. Ségransan, B. Smalley, A. M. S. Smith, J. Southworth, A. H. M. J. Triaud, and S. Udry. A&A 585:A126 (2016).
WASP-121b  EPE  NASA
H2O
An ultrahot gas-giant exoplanet with a stratosphere
T. M. Evans, D. K. Sing, T. Kataria, J. Goyal, N. Nikolov, H. R. Wakeford, D. Deming, M. S. Marley, D. S. Amundsen, G. E. Ballester, J. K. Barstow, L. Ben-Jaffel, V. Bourrier, L. A. Buchhave, O. Cohen, D. Ehrenreich, A. García Muñoz, G. W. Henry, H. Knutson, P. Lavvas, A. Lecavelier des Etangs, N. K. Lewis, M. López-Morales, A. M. Mandell, J. Sanz-Forcada, P. Tremblin, and R. Lupu. Nature 548:58-61 (2017).
WASP-189b  EPE  NASA
TiO
WASP-189b: an ultra-hot Jupiter transiting the bright A star HR 5599 in a polar orbit
D. R. Anderson, L. Y. Temple, L. D. Nielsen, A. Burdanov, C. Hellier, F. Bouchy, D. J. A. Brown, A. Collier Cameron, M. Gillon, E. Jehin, P. F. L. Maxted, F. Pepe, D. Pollacco, F. J. Pozuelos, D. Queloz, D. Ségransan, B. Smalley, A. H. M. J. Triaud, O. D. Turner, S. Udry, and R. G. West. arXiv: 1809.04897 (2018).

Acronymns & Acronyms within Acronyms
  GJ Gliese-Jahreiss Catalog  
  HAT-P HAT Planet  
  HAT Hungarian Automatic Telescope  
  HD Henry Draper Catalog  
  KELT Kilodegree Extremely Little Telescope  
  MASCARA Multi-site All-Sky CAmeRA  
  TOI TESS Object of Interest  
  TESS Transiting Exoplanetary Survey Satellite  
  TYC Tyco Catalog  
  WASP Wide Angle Search for Planets  

Maintained by DE Woon
Updated 30 January 2022