Vedad Hodzic
WASP-128b: a transiting brown dwarf in the dynamical-tide regime
Hodzic, Vedad; Triaud, Amaury H. M. J.; Anderson, David R.; Bouchy, Francois; Cameron, Andrew Collier; Delrez, Laetitia; Gillon, Michael; Hellier, Coel; Jehin, Emmanuel; Lendl, Monika; Maxted, Pierre F. L.; Pepe, Francesco; Pollacco, Don; Queloz, Didier; Segransan, Damien; Smalley, Barry; Udry, Stephane; West, Richard
Authors
Amaury H. M. J. Triaud
David R. Anderson
Francois Bouchy
Andrew Collier Cameron
Laetitia Delrez
Michael Gillon
Coel Hellier c.hellier@keele.ac.uk
Emmanuel Jehin
Monika Lendl
Pierre Maxted p.maxted@keele.ac.uk
Francesco Pepe
Don Pollacco
Didier Queloz
Damien Segransan
Barry Smalley b.smalley@keele.ac.uk
Stephane Udry
Richard West
Abstract
Massive companions in close orbits around G dwarfs are thought to undergo rapid orbital decay due to runaway tidal dissipation. We report here the discovery of WASP-128b, a brown dwarf discovered by the WASP survey transiting a G0V host on a 2.2 d orbit, where the measured stellar rotation rate places the companion in a regime where tidal interaction is dominated by dynamical tides. Under the assumption of dynamical equilibrium, we derive a value of the stellar tidal quality factor logQ'?=6.96±0.19. A combined analysis of ground-based photometry and high-resolution spectroscopy reveals a mass and radius of the host, M? = 1.16 ± 0.04M?, R? = 1.16 ± 0.02R?, and for the companion, Mb = 37.5 ± 0.8Mj, Rb = 0.94 ± 0.02Rj, placing WASP-128b in the driest parts of the brown dwarf desert, and suggesting a mild inflation for its age. We estimate a remaining lifetime for WASP-128b similar to that of some ultra-short period massive hot Jupiters, and note it may be a propitious candidate for measuring orbital decay and testing tidal theories.
Journal Article Type | Article |
---|---|
Acceptance Date | Aug 27, 2018 |
Online Publication Date | Sep 14, 2018 |
Publication Date | 2018-12 |
Publicly Available Date | Mar 28, 2024 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Publisher | Oxford University Press |
Peer Reviewed | Peer Reviewed |
Volume | 481 |
Issue | 4 |
Pages | 5091-5097 |
DOI | https://doi.org/10.1093/mnras/sty2512 |
Keywords | methods, data analysis, brown dwarfs, binaries, eclipsing, planets and satellites, dynamical evolution and stability |
Publisher URL | http://dx.doi.org/10.1093/mnras/sty2512 |
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