Hot Jupiters with relatives: discovery of additional planets in orbit around WASP-41 and WASP-47

M. Neveu-VanMalle, Didier Queloz, D.~R. Anderson, D.~J.~A. Brown, A. Collier Cameron, L. Delrez, R.~F. Díaz, M. Gillon, C. Hellier, E. Jehin, T. Lister, F. Pepe, P. Rojo, D. Ségransan, A.~H.~M.~J. Triaud, O.~D. Turner, S. Udry

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42 Citations (Scopus)


We report the discovery of two additional planetary companions to WASP-41 and WASP-47. WASP-41 c is a planet of minimum mass 3.18 plusmn 0.20 M$_Jup$ and eccentricity 0.29 plusmn 0.02, and it orbits in 421 plusmn 2 days. WASP-47 c is a planet of minimum mass 1.24 plusmn 0.22 M$_Jup$ and eccentricity 0.13 plusmn 0.10, and it orbits in 572 plusmn 7 days. Unlike most of the planetary systems that include a hot Jupiter, these two systems with a hot Jupiter have a long-period planet located at only 1 au from their host star. WASP-41 is a rather young star known to be chromospherically active. To differentiate its magnetic cycle from the radial velocity effect induced by the second planet, we used the emission in the H$ line and find this indicator well suited to detecting the stellar activity pattern and the magnetic cycle. The analysis of the Rossiter-McLaughlin effect induced by WASP-41 b suggests that the planet could be misaligned, though an aligned orbit cannot be excluded. WASP-47 has recently been found to host two additional transiting super Earths. With such an unprecedented architecture, the WASP-47 system will be very important for understanding planetary migration. Using data collected at ESO's La Silla Observatory, Chile: HARPS on the ESO 3.6 m (Prog ID 087.C-0649 amp 089.C-0151), the Swiss Euler Telescope, TRAPPIST, the 1.54-m Danish telescope (Prog CN2013A-159), and at the LCOGT's Faulkes Telescope South.Photometric lightcurve and RV tables are only available at the CDS via anonymous ftp to ( or via
Original languageEnglish
Pages (from-to)A93
JournalAstronomy and Astrophysics
Publication statusPublished - 1 Feb 2016


  • techniques: photometric
  • stars: individual: WASP-47
  • stars: individual: WASP-41
  • techniques: radial velocities
  • techniques: spectroscopic
  • planetary systems
  • stars: individual: WASP-50


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