* Astronomy

Title: WASP-104b and WASP-106b: two transiting hot Jupiters in 1.75-day and 9.3-day orbits
Author: A. M. S. Smith, D. R. Anderson, D. J. Armstrong, S. C. C. Barros, A. S. Bonomo, F. Bouchy, D. J. A. Brown, A. Collier Cameron, L. Delrez, F. Faedi, M. Gillon, Y. Gómez Maqueo Chew, G. Hébrard, E. Jehin, M. Lendl, T. M. Louden, P. F. L. Maxted, G. Montagnier, M. Neveu-VanMalle, H. P. Osborn, F. Pepe, D. Pollacco, D. Queloz, J. W. Rostron, D. Segransan, B. Smalley, A. H. M. J. Triaud, O. D. Turner, S. Udry, S. R. Walker, R. G. West, P. J. Wheatley
(version, v2)

We report the discovery from the WASP survey of 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 MJup, while WASP-106b has a mass of 1.93±0.08 MJup). Both planets are just slightly larger than Jupiter, with radii of 1.14±0.04 and 1.09±0.04 RJup 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.

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