WASP-103 b: a new planet at the edge of tidal disruption

M. Gillon*, D. R. Anderson, A. Collier-Cameron, L. Delrez, C. Hellier, E. Jehin, M. Lendl, P. F. L. Maxted, F. Pepe, D. Pollacco, D. Queloz, D. Segransan, A. M. S. Smith, B. Smalley, J. Southworth, A. H. M. J. Triaud, S. Udry, V. Van Grootel, R. G. West

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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We report the discovery of WASP-103 b, a new ultra-short-period planet (P = 22.2 h) transiting a 12.1 V-magnitude F8-type main-sequence star (1.22 ± 0.04 M, 1.44-0.03+0.05 R, Teff = 6110 ± 160 K). WASP-103 b is significantly more massive (1.49 ± 0.09 MJup) and larger (1.53-0.07+0.05 RJup) than Jupiter. Its large size and extreme irradiation (~ 9 × 109 erg s-1 cm-2) make it an exquisite target for a thorough atmospheric characterization with existing facilities. Furthermore, its orbital distance is less than 20% larger than its Roche radius, meaning that it might be significantly distorted by tides and might experience mass loss through Roche-lobe overflow. It thus represents a new key object for understanding the last stage of the tidal evolution of hot Jupiters.

Original languageEnglish
Article numberL3
Number of pages4
JournalAstronomy & Astrophysics
Publication statusPublished - 5 Feb 2014


  • Planetary systems
  • Stars: individual: WASP-103
  • Techniques: photometric
  • Techniques: radial velocities
  • Techniques: spectroscopic
  • Hot-Jupiter
  • Extrasolar planet
  • Thermal emission
  • Star
  • Transits
  • Exoplanet
  • Stellar
  • Systems
  • Period
  • Disk


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