WASP-104b and WASP-106b: two transiting hot Jupiters in 1.75-day and 9.3-day orbits

A. M. S. Smith , D. R. Anderson (1) , D. J. Armstrong , S. C. C. Barros (2) , A. S. Bonomo , F. Bouchy (3, 4) , D. J. A. Brown , A. Collier Cameron (5) , L. Delrez , F. Faedi , M. Gillon (6) , Y. Gomez Maqueo Chew , G. Hébrard (4) , E. Jehin (6) , M. Lendl , T. M. Louden , P. F. L. Maxted , G. Montagnier (7) , M. Neveu-Vanmalle , H. P. Osborn , F. Pepe (8) , D. Pollacco , D. Queloz (8) , J. W. Rostron , D. Ségransan (8) , B. Smalley , A. H. M. J. Triaud (8) , O. D. Turner , S. Udry (8) , S. R. Walker , R. G. West , P. J. Wheatley

1 DRA - Department of Medicine - Halifax
2 LAM - Laboratoire d'Astrophysique de Marseille
3 OHP - Observatoire de Haute-Provence
4 IAP - Institut d'Astrophysique de Paris
5 University of St Andrews [Scotland]
6 Institut d'Astrophysique et de Géophysique [Liège]
7 ESO - European Southern Observatory
8 ObsGE - Observatoire Astronomique de l'Université de Genève

We have used the WASP survey to discover two exoplanetary systems, each consisting of a Jupiter-sized planet transiting an 11th-magnitude (V) main-sequence star. WASP-104b orbits its star in 1.75 d, whereas WASP-106b has the fourth-longest orbital period of any planet discovered by means of transits observed from the ground, orbiting every 9.29 d. Each planet is more massive than Jupiter (WASP-104b has a mass of 1.27 +/- 0.05 M-Jup, while WASP-106b has a mass of 1.93 +/- 0.08 M-Jup). Both planets are just slightly larger than Jupiter, with radii of 1.14 +/- 0.04 and 1.09 +/- 0.04 R-Jup for WASP-104 and WASP-106, respectively. No significant orbital eccentricity is detected in either system, and while this is not surprising in the case of the short-period WASP-104b, it is interesting in the case of WASP-106b, because many otherwise similar planets are known to have eccentric orbits.

Domaines: Astrophysique [astro-ph]

A. M. S. Smith, D. R. Anderson, D. J. Armstrong, S. C. C. Barros, A. S. Bonomo, et al.. WASP-104b and WASP-106b: two transiting hot Jupiters in 1.75-day and 9.3-day orbits. Astronomy and Astrophysics - A&A, 2014, 570, ⟨10.1051/0004-6361/201424752⟩. ⟨hal-01441985⟩