Astronomy and Astrophysics, volume 586A, 93-93 (2016/2-1)
Hot Jupiters with relatives: discovery of additional planets in orbit around WASP-41 and WASP-47.
NEVEU-VANMALLE M., QUELOZ D., ANDERSON D.R., BROWN D.J.A., COLLIER CAMERON A., DELREZ L., DIAZ R.F., GILLON M., HELLIER C., JEHIN E., LISTER T., PEPE F., ROJO P., SEGRANSAN D., TRIAUD A.H.M.J., TURNER O.D. and UDRY S.
Abstract (from CDS):
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±0.20MJup and eccentricity 0.29±0.02, and it orbits in 421±2-days. WASP-47 c is a planet of minimum mass 1.24±0.22MJup 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 ∼1au 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.
stars: individual: WASP-47 - stars: individual: WASP-41 - techniques: photometric - techniques: radial velocities - techniques: spectroscopic - planetary systems
VizieR on-line data:
<Available at CDS (J/A+A/586/A93): w41phz.dat w41piz.dat w41phr.dat w41rvcor.dat w41rvhar.dat w47rvc07.dat w47rvc14.dat>
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