WASP-128b: a transiting brown dwarf in the dynamical-tide regime. Issue 4 (14th September 2018)
- Record Type:
- Journal Article
- Title:
- WASP-128b: a transiting brown dwarf in the dynamical-tide regime. Issue 4 (14th September 2018)
- Main Title:
- WASP-128b: a transiting brown dwarf in the dynamical-tide regime
- Authors:
- Hodžić, Vedad
Triaud, Amaury H M J
Anderson, David R
Bouchy, François
Cameron, Andrew Collier
Delrez, Laetitia
Gillon, Michaël
Hellier, Coel
Jehin, Emmanuël
Lendl, Monika
Maxted, Pierre F L
Pepe, Francesco
Pollacco, Don
Queloz, Didier
Ségransan, Damien
Smalley, Barry
Udry, Stéphane
West, Richard - Abstract:
- 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 $2.2\, \mathrm{d}$ 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 $\log {Q_\star ^{\prime }} = 6.96 \pm 0.19$ . A combined analysis of ground-based photometry and high-resolution spectroscopy reveals a mass and radius of the host, $M_\star = 1.16\pm 0.04\, \mathrm{M}_{\odot }$, $R_\star = 1.16\pm 0.02\, \mathrm{R}_{\odot }$, and for the companion, $M_\mathrm{b} = 37.5\pm 0.8\, M_\mathrm{J}$, $R_\mathrm{b} = 0.94\pm 0.02\, R_\mathrm{J}$, 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.
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 481:Issue 4(2018)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 481:Issue 4(2018)
- Issue Display:
- Volume 481, Issue 4 (2018)
- Year:
- 2018
- Volume:
- 481
- Issue:
- 4
- Issue Sort Value:
- 2018-0481-0004-0000
- Page Start:
- 5091
- Page End:
- 5097
- Publication Date:
- 2018-09-14
- Subjects:
- methods: data analysis -- planets and satellites: dynamical evolution and stability -- binaries: eclipsing -- brown dwarfs
Astronomy -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://mnras.oxfordjournals.org/ ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966 ↗
http://www.blackwell-synergy.com/issuelist.asp?journal=mnr ↗
http://www.blackwell-synergy.com/loi/mnr ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnras/sty2512 ↗
- Languages:
- English
- ISSNs:
- 0035-8711
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5943.000000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 12198.xml