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

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

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

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 ± 0.20 MJup and eccentricity 0.29 ± 0.02, and it orbits in 421 ± 2 days. WASP-47 c is a planet of minimum mass 1.24 ± 0.22 MJup and eccentricity 0.13 ± 0.10, and it orbits in 572 ± 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 Hα 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.
Original languageEnglish
Article numberA93
Number of pages12
JournalAstronomy & Astrophysics
Volume586
DOIs
Publication statusPublished - Feb 2016

Keywords

  • Stars: individual: WASP-47
  • Stars: individual: WASP-41
  • Techniques: photometric
  • Techniques: radial velocities
  • Techniques: spectroscopic
  • Planetary systems

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