Many exoplanets have now been identified, and astronomers have been able to identify molecules in some of their atmospheres. Like all of the pages on this website, this is a work in progress.

MOLECULES (click for citation)
CI Tau b
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)
HD 102195b
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).
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).
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)
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).

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Updated 30 June 2019