WASP-128b: a transiting brown dwarf in the dynamical-tide regime

Vedad Hodžić; Amaury H. M. J. Triaud; David R. Anderson; François Bouchy; Andrew Collier Cameron; Laetitia Delrez; Michaël Gillon; Coel Hellier; Emmanuël Jehin; Monika Lendl; Pierre F. L. Maxted; Francesco Pepe; Don Pollacco; Didier Queloz; Damien Ségransan; Barry Smalley; Stéphane Udry; Richard West

doi:10.1093/mnras/sty2512

WASP-128b: a transiting brown dwarf in the dynamical-tide regime

Vedad Hodžić
, Amaury H. M. J. Triaud
, David R. Anderson
, François Bouchy
, Andrew Collier Cameron
, Laetitia Delrez
, Michaël Gillon
, Coel Hellier
, Emmanuël Jehin
, Monika Lendl
, Pierre F. L. Maxted
, Francesco Pepe
, Don Pollacco
, Didier Queloz
, Damien Ségransan
, Barry Smalley
, Stéphane Udry
, Richard West

Research output: Contribution to journal › Article › peer-review

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 ± 0.04 M⊙, R⋆ = 1.16 ± 0.02 R⊙, 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.

Original language	English
Pages (from-to)	5091–5097
Journal	Monthly Notices of the Royal Astronomical Society
Volume	481
Issue number	4
Early online date	14 Sept 2018
DOIs	https://doi.org/10.1093/mnras/sty2512
Publication status	Published - 21 Dec 2018

Keywords

Methods: data analysis
Brown dwarfs
Binaries: eclipsing
Planets and satellites: dynamical evolution and stability

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Hodzic_2018_MNRAS_WASP-128b_AAM
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnras/sty2512
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Hodžić, V., Triaud, A. H. M. J., Anderson, D. R., Bouchy, F., Cameron, A. C., Delrez, L., Gillon, M., Hellier, C., Jehin, E., Lendl, M., Maxted, P. F. L., Pepe, F., Pollacco, D., Queloz, D., Ségransan, D., Smalley, B., Udry, S., & West, R. (2018). WASP-128b: a transiting brown dwarf in the dynamical-tide regime. Monthly Notices of the Royal Astronomical Society, 481(4), 5091–5097. https://doi.org/10.1093/mnras/sty2512

@article{6139c327720c47488ba53876b1825a7d,

title = "WASP-128b: a transiting brown dwarf in the dynamical-tide regime",

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 ± 0.04 M⊙, R⋆ = 1.16 ± 0.02 R⊙, 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.",

keywords = "Methods: data analysis, Brown dwarfs, Binaries: eclipsing, Planets and satellites: dynamical evolution and stability",

author = "Vedad Hod{\v z}i{\'c} and Triaud, \{Amaury H. M. J.\} and Anderson, \{David R.\} and Fran{\c c}ois Bouchy and Cameron, \{Andrew Collier\} and Laetitia Delrez and Micha{\"e}l Gillon and Coel Hellier and Emmanu{\"e}l Jehin and Monika Lendl and Maxted, \{Pierre F. L.\} and Francesco Pepe and Don Pollacco and Didier Queloz and Damien S{\'e}gransan and Barry Smalley and St{\'e}phane Udry and Richard West",

year = "2018",

month = dec,

day = "21",

doi = "10.1093/mnras/sty2512",

language = "English",

volume = "481",

pages = "5091–5097",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "4",

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Hodžić, V, Triaud, AHMJ, Anderson, DR, Bouchy, F, Cameron, AC, Delrez, L, Gillon, M, Hellier, C, Jehin, E, Lendl, M, Maxted, PFL, Pepe, F, Pollacco, D, Queloz, D, Ségransan, D, Smalley, B, Udry, S & West, R 2018, 'WASP-128b: a transiting brown dwarf in the dynamical-tide regime', Monthly Notices of the Royal Astronomical Society, vol. 481, no. 4, pp. 5091–5097. https://doi.org/10.1093/mnras/sty2512

TY - JOUR

T1 - WASP-128b

T2 - a transiting brown dwarf in the dynamical-tide regime

AU - Hodžić, Vedad

AU - Triaud, Amaury H. M. J.

AU - Anderson, David R.

AU - Bouchy, François

AU - Cameron, Andrew Collier

AU - Delrez, Laetitia

AU - Gillon, Michaël

AU - Hellier, Coel

AU - Jehin, Emmanuël

AU - Lendl, Monika

AU - Maxted, Pierre F. L.

AU - Pepe, Francesco

AU - Pollacco, Don

AU - Queloz, Didier

AU - Ségransan, Damien

AU - Smalley, Barry

AU - Udry, Stéphane

AU - West, Richard

PY - 2018/12/21

Y1 - 2018/12/21

N2 - 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 ± 0.04 M⊙, R⋆ = 1.16 ± 0.02 R⊙, 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.

AB - 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 ± 0.04 M⊙, R⋆ = 1.16 ± 0.02 R⊙, 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.

KW - Methods: data analysis

KW - Brown dwarfs

KW - Binaries: eclipsing

KW - Planets and satellites: dynamical evolution and stability

UR - http://adsabs.harvard.edu/abs/2018MNRAS.tmp.2403H

U2 - 10.1093/mnras/sty2512

DO - 10.1093/mnras/sty2512

M3 - Article

SN - 0035-8711

VL - 481

SP - 5091

EP - 5097

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

WASP-128b: a transiting brown dwarf in the dynamical-tide regime

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Keywords

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