Article (Scientific journals)
Hot Jupiters with relatives: discovery of additional planets in orbit around WASP-41 and WASP-47
Neveu-VanMalle, M.; Queloz, D.; Anderson, D. R. et al.
2016In Astronomy and Astrophysics, 586, p. 93
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Keywords :
Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] 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 $\pm$ 0.20 M$_{\rm Jup}$ and eccentricity 0.29 $\pm$ 0.02, and it orbits in 421 $\pm$ 2 days. WASP-47 c is a planet of minimum mass 1.24 $\pm$ 0.22 M$_{\rm Jup}$ and eccentricity 0.13 $\pm$ 0.10, and it orbits in 572 $\pm$ 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 $\sim$1 au from their host star. WASP-41 is a rather young star known to be chromospherically active. To differentiate its magnetic cycle from the radial velocity effect induced by the second planet, we used the emission in the H$\alpha$ 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Neveu-VanMalle, M.
Queloz, D.
Anderson, D. R.
Brown, D. J. A.
Collier Cameron, A.
Delrez, Laetitia ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Díaz, R. F.
Gillon, Michaël  ;  Université de Liège - ULiège
Hellier, C.
Jehin, Emmanuel  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Lister, T.
Pepe, F.
Rojo, P.
Ségransan, D.
Triaud, A. H. M. J.
Turner, O. D.
Udry, S.
More authors (7 more) Less
Language :
English
Title :
Hot Jupiters with relatives: discovery of additional planets in orbit around WASP-41 and WASP-47
Publication date :
01 February 2016
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
586
Pages :
93
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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