TY - JOUR
T1 - Hot Jupiters with relatives
T2 - discovery of additional planets in orbit around WASP-41 and WASP-47
AU - Neveu-VanMalle, M.
AU - Queloz, Didier
AU - Anderson, D.~R.
AU - Brown, D.~J.~A.
AU - Collier Cameron, A.
AU - Delrez, L.
AU - Díaz, R.~F.
AU - Gillon, M.
AU - Hellier, C.
AU - Jehin, E.
AU - Lister, T.
AU - Pepe, F.
AU - Rojo, P.
AU - Ségransan, D.
AU - Triaud, A.~H.~M.~J.
AU - Turner, O.~D.
AU - Udry, S.
PY - 2016/2/1
Y1 - 2016/2/1
N2 - 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 http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/586/A93
AB - 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 http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/586/A93
KW - techniques: photometric
KW - stars: individual: WASP-47
KW - stars: individual: WASP-41
KW - techniques: radial velocities
KW - techniques: spectroscopic
KW - planetary systems
KW - stars: individual: WASP-50
U2 - 10.1051/0004-6361/201526965
DO - 10.1051/0004-6361/201526965
M3 - Article
SN - 0004-6361
VL - 586
SP - A93
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
ER -