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Peculiar architectures for the WASP-53 and WASP-81 planet-hosting systems

Triaud, Amaury H.M.J.; Neveu-VanMalle, Marion; Lendl, Monika; Anderson, David R.; Collier Cameron, Andrew; Delrez, Laetitia; Doyle, Amanda; Gillon, Michaël; Hellier, Coel; Jehin, Emmanuël; Maxted, Pierre F.L.; Ségransan, Damien; Smalley, Barry; Queloz, Didier; Pollacco, Don; Southworth, John; Tregloan-Reed, Jeremy; Udry, Stéphane; West, Richard

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Authors

Amaury H.M.J. Triaud

Marion Neveu-VanMalle

Monika Lendl

David R. Anderson

Andrew Collier Cameron

Laetitia Delrez

Amanda Doyle

Michaël Gillon

Emmanuël Jehin

Damien Ségransan

Didier Queloz

Don Pollacco

Jeremy Tregloan-Reed

Stéphane Udry

Richard West



Abstract

We report the detection of two new systems containing transiting planets. Both were identified by WASP as worthy transiting planet candidates. Radial velocity observations quickly verified that the photometric signals were indeed produced by two transiting hot Jupiters. Our observations also show the presence of additional Doppler signals. In addition to short-period hot Jupiters, we find that the WASP-53 and WASP-81 systems also host brown dwarfs, on fairly eccentric orbits with semimajor axes of a few astronomical units. WASP-53c is over 16 MJupsin?ic and WASP-81c is 57 MJupsin?ic. The presence of these tight, massive companions restricts theories of how the inner planets were assembled. We propose two alternative interpretations: the formation of the hot Jupiters within the snow line or the late dynamical arrival of the brown dwarfs after disc dispersal. We also attempted to measure the Rossiter–McLaughlin effect for both hot Jupiters. In the case of WASP-81b, we fail to detect a signal. For WASP-53b, we find that the planet is aligned with respect to the stellar spin axis. In addition we explore the prospect of transit-timing variations, and of using Gaia's astrometry to measure the true masses of both brown dwarfs and also their relative inclination with respect to the inner transiting hot Jupiters.

Citation

Triaud, A. H., Neveu-VanMalle, M., Lendl, M., Anderson, D. R., Collier Cameron, A., Delrez, L., …West, R. (2017). Peculiar architectures for the WASP-53 and WASP-81 planet-hosting systems. Monthly Notices of the Royal Astronomical Society, 467(2), 1714 - 1733. https://doi.org/10.1093/mnras/stx154

Journal Article Type Article
Acceptance Date Jan 17, 2017
Online Publication Date Jan 22, 2017
Publication Date 2017-05
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 467
Issue 2
Pages 1714 - 1733
DOI https://doi.org/10.1093/mnras/stx154
Keywords planets and satellites, WASP-81, WASP-53, binaries, eclipsing, brown dwarfs, planetary systems
Publisher URL https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stx154

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