Simplified 3D GCM modelling of the irradiated brown dwarf WD0137-349B

Abstract

Context: White dwarf - Brown dwarf short period binaries (P${}_{\mathrm{orb}}$ $\lesssim$ 2 hours) are some of the most extreme irradiated atmospheric environments known. These systems offer an opportunity to explore theoretical and modelling efforts of irradiated atmospheres different to typical hot Jupiter systems. Aims: We aim to investigate the three dimensional atmospheric structural and dynamical properties of the Brown dwarf WD0137-349B. Methods: We use the three dimensional GCM model Exo-FMS, with a dual-band grey radiative-transfer scheme to model the atmosphere of WD0137-349B. The results of the GCM model are post-processed using the three dimensional Monte Carlo radiative-transfer model \textsc{cmcrt}. Results: Our results suggest inefficient day-night energy transport and a large day-night temperature contrast for WD0137-349B. Multiple flow patterns are present, shifting energy asymmetrically eastward or westward depending on their zonal direction and latitude. Regions of overturning are produced on the western terminator. We are able to reproduce the start of the system near-IR emission excess at $\gtrsim$ 1.95 $\mu$m as observed by the GNIRS instrument. Our model over predicts the IR phase curve fluxes by factors of $\approx$1-3, but generally fits the shape of the phase curves well. Chemical kinetic modelling using \textsc{vulcan} suggests a highly ionised region at high altitudes can form on the dayside of the Brown dwarf. Conclusions: We present a first attempt at simulating the atmosphere of a short period White dwarf - Brown dwarf binary in a 3D setting. Further studies into the radiative and photochemical heating from the UV irradiation is required to more accurately capture the energy balance inside the Brown dwarf atmosphere. Cloud formation may also play an important role in shaping the emission spectra of the Brown dwarf.

arXiv commentVersion 2 - Accepted June 19 2020 (MNRAS)

References in corpus (72)

• The chemical composition of the Sun
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• ExoMol molecular line lists XXX: a complete high-accuracy line list for water
• Atmospheric Circulation and Tides of "51Peg b-like" Planets
• Atmospheric circulation of hot Jupiters: Coupled radiative-dynamical general circulation model simulations of HD 189733b and HD 209458b
• On the radiative equilibrium of irradiated planetary atmospheres
• The ExoMol database: molecular line lists for exoplanet and other hot atmospheres
• Disequilibrium Carbon, Oxygen, and Nitrogen Chemistry in the Atmospheres of HD 189733b and HD 209458b
• Neglected Clouds in T and Y Dwarf Atmospheres
• Equatorial superrotation on tidally locked exoplanets
• A variationally computed line list for hot NH3
• Atmospheric Chemistry in Giant Planets, Brown Dwarfs, and Low-Mass Dwarf Stars II. Sulfur and Phosphorus
• Equilibrium chemistry down to 100 K - Impact of silicates and phyllosilicates on carbon/oxygen ratio
• Atmospheric Chemistry in Giant Planets, Brown Dwarfs, and Low-Mass Dwarf Stars III. Iron, Magnesium, and Silicon
• Extremely Irradiated Hot Jupiters: Non-Oxide Inversions, H- Opacity, and Thermal Dissociation of Molecules
• Atmospheric Circulation of Hot Jupiters: Three-dimensional circulation models of HD 209458b and HD 189733b with Simplified Forcing
• VULCAN: an Open-Source, Validated Chemical Kinetics Python Code for Exoplanetary Atmospheres
• Atmospheric Circulation of Hot Jupiters: Dayside-Nightside Temperature Differences
• The HST PanCET Program: Exospheric Mg II and Fe II in the Near-UV transmission spectrum of WASP-121b using Jitter Decorrelation
• The atmospheric circulation of a nine-hot Jupiter sample: Probing circulation and chemistry over a wide phase space
• Atmospheric Dynamics of Hot Exoplanets
• A General Circulation Model for Gaseous Exoplanets with Double-Gray Radiative Transfer
• A hybrid line list for CH${}_4$ and hot methane continuum
• Survival of a brown dwarf after engulfment by a red giant star
• Atmospheric Circulation of Eccentric Hot Neptune GJ436b
• High temperature condensate clouds in super-hot Jupiter atmospheres
• The Atmospheric Circulation of Ultra-hot Jupiters
• Atmospheric Circulation of Hot Jupiters: Dayside-Nightside Temperature Differences. II. Comparison with Observations
• A Chemical Kinetics Network for Lightning and Life in Planetary Atmospheres
• Dust in brown dwarfs and extra-solar planets II. Cloud formation for cosmologically evolving abundances
• Treatment of overlapping gaseous absorption with the correlated-k method in hot Jupiter and brown dwarf atmosphere models
• The Intrinsic Temperature and Radiative-Convective Boundary Depth in the Atmospheres of Hot Jupiters
• Atmospheric circulation of tidally locked exoplanets: II. Dual-band radiative transfer and convective adjustment
• Three-dimensional atmospheric circulation of hot Jupiters on highly eccentric orbits
• A Possible Brown Dwarf Companion to the White Dwarf GD1400
• Implications of three-dimensional chemical transport in hot Jupiter atmospheres: results from a consistently coupled chemistry-radiation-hydrodynamics model
• Observations of Disequilibrium CO Chemistry in the Coldest Brown Dwarfs
• Connecting the dots II: Phase changes in the climate dynamics of tidally locked terrestrial exoplanets
• Three-Dimensional Circulation Driving Chemical Disequilibrium in WASP-43b
• Linking the Climate and Thermal Phase Curve of 55 Cancri e
• Toward the analysis of JWST exoplanet spectra: Identifying troublesome model parameters
• White dwarfs in the UKIDSS Large Area Survey: The Substellar Companion Fraction
• Equatorial anti-rotating day side wind flow in WASP-43b elicited by deep wind jets?
• Atmospheric circulation of hot Jupiters: insensitivity to initial conditions
• The Effect of 3D Transport-Induced Disequilibrium Carbon Chemistry on the Atmospheric Structure and Phase Curves and Emission Spectra of Hot Jupiter HD 189733b
• Observable signatures of wind--driven chemistry with a fully consistent three dimensional radiative hydrodynamics model of HD 209458b
• The Atmospheric Circulation and Observable Properties of Non-Synchronously Rotating Hot Jupiters
• NLTT5306: The shortest Period Detached White Dwarf + Brown Dwarf Binary
• Two white dwarfs in ultrashort binaries with detached, eclipsing, likely substellar companions detected by K2
• Shear-driven instabilities and shocks in the atmospheres of hot Jupiters
• The substellar companion in the eclipsing white dwarf binary SDSS J141126.20+200911.1
• A near-infrared spectroscopic detection of the brown dwarf in the post common envelope binary WD0137-349
• Multiwaveband photometry of the irradiated brown dwarf WD0137-349B
• An irradiated brown-dwarf companion to an accreting white dwarf
• WD0837+185:the formation and evolution of an extreme mass ratio white dwarf-brown dwarf binary in Praesepe
• The first sub-70 minute non-interacting WD-BD system: EPIC212235321
• Composite biasing in Monte Carlo radiative transfer
• The eclipsing post-common envelope binary CSS21055: a white dwarf with a probable brown-dwarf companion
• Dynamics of atmospheres with a non-dilute condensible component
• Emission lines in the atmosphere of the irradiated brown dwarf WD0137-349B
• Aluminium oxide in the atmosphere of hot Jupiter WASP-43b
• Ozone chemistry on tidally locked M dwarf planets
• WD 1202-024: The Shortest-Period Pre-Cataclysmic Variable
• The thermal phase curve offset on tidally- and non-tidally-locked exoplanets: A shallow water model
• Atmospheric Circulation and Thermal Phase-Curve Offset of Tidally and Non-Tidally Locked Terrestrial Exoplanets
• The direct detection of the irradiated brown dwarf in the white dwarf - brown dwarf binary SDSS J141126.20+200911.1
• Exoplanetary Monte Carlo Radiative Transfer with Correlated-k I. Benchmarking Transit and Emission Observables
• Convective dynamics and disequilibrium chemistry in the atmospheres of giant planets and brown dwarfs
• Dynamic mineral clouds on HD 189733b II. Monte Carlo radiative transfer for 3D cloudy exoplanet atmospheres: combining scattering and emission spectra
• Hot Jupiter Atmospheric Flows at High Resolution
• A near-IR spectrum of the DO white dwarf RE J0503-285
• Brown Dwarf Companions to White Dwarfs

Cited by in corpus (26)

• The ExoMolOP Database: Cross-sections and k-tables for Molecules of Interest in High-Temperature Exoplanet Atmospheres
• Atmospheric Dynamics of Hot Giant Planets and Brown Dwarfs
• Atmospheric Regimes and Trends on Exoplanets and Brown Dwarfs
• Simulating gas giant exoplanet atmospheres with Exo-FMS: Comparing semi-grey, picket fence and correlated-k radiative-transfer schemes
• Grid of Pseudo-2D Chemistry Models for Tidally-Locked Exoplanets. I. The Role of Vertical and Horizontal Mixing
• 3D radiative-transfer for exoplanet atmospheres. gCMCRT: a GPU accelerated MCRT code
• Exoplanet weather and climate regimes with clouds and thermal ionospheres: A model grid study in support of large-scale observational campaigns
• A Mini-Chemical Scheme with Net Reactions for 3D GCMs II. 3D thermochemical modelling of WASP-39b and HD 189733b
• Atmospheric circulation of tidally locked gas giants with increasing rotation and implications for white-dwarf-brown-dwarf systems
• Atmosphere Models of Brown Dwarfs Irradiated by White Dwarfs: Analogues for Hot and Ultra-Hot Jupiters
• The THOR+HELIOS general circulation model: multi-wavelength radiative transfer with accurate scattering by clouds/hazes
• Day-night transport induced chemistry and clouds on WASP-39b I: Gas-phase composition
• Dynamically coupled kinetic chemistry in brown dwarf atmospheres I. Performing global scale kinetic modelling
• Atmospheric dynamics of temperate sub-Neptunes. Part I: dry dynamics
• HST/WFC3 Complete Phase-resolved Spectroscopy of White Dwarf-Brown Dwarf Binaries WD 0137 and EPIC 2122
• Exploring deep and hot adiabats as a potential solution to the radius inflation problem in brown dwarfs: Long-timescale models of the deep atmospheres of KELT-1b, Kepler-13Ab, and SDSS1411B
• Cloud-convection feedback in brown dwarfs atmosphere
• Mapping the pressure-dependent day-night temperature contrast of a strongly irradiated atmosphere with HST spectroscopic phase curve
• Hotter Than Expected: HST/WFC3 Phase-resolved Spectroscopy of a Rare Irradiated Brown Dwarf with Strong Internal Heat Flux
• Influences of internal forcing on atmospheric circulations of irradiated giant planets
• Examining NHD vs QHD in the GCM THOR with non-grey radiative transfer for the hot Jupiter regime
• An irradiated-Jupiter analogue hotter than the Sun
• Inferring Shallow Surfaces on sub-Neptune Exoplanets with JWST
• Flows, Circulations, and Energy Transport in the Outer and Deep Atmospheres of Synchronous and Non-synchronous Hot Jupiters
• Patchy nightside clouds on ultra-hot Jupiters: General Circulation Model simulations with radiatively active cloud tracers
• Dynamics of Y Dwarf Atmospheres