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

Hellier

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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 Ha 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.

Citation

Hellier. (2016). Hot Jupiters with relatives: discovery of additional planets in orbit around WASP-41 and WASP-47. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201526965

Acceptance Date Sep 30, 2015
Publication Date Feb 1, 2016
Journal ASTRONOMY & ASTROPHYSICS
Print ISSN 0004-6361
Publisher EDP Sciences
DOI https://doi.org/10.1051/0004-6361/201526965
Keywords Stars: Individual: WASP-47; Stars: Individual: WASP-41; techniques: photometric; techniques: radial velocities; techniques: spectroscopic; planetary systems
Publisher URL https://doi.org/10.1051/0004-6361/201526965

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