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[cea-02571500] A new set of atmosphere and evolution models for cool T–Y brown dwarfs and giant exoplanets  (6/5/20)   Moins
We present a new set of solar metallicity atmosphere and evolutionary models for very cool brown dwarfs and self-luminous giant exoplanets, which we term ATMO 2020. Atmosphere models are generated with our state-of-the-art 1D radiative-convective equilibrium code ATMO, and are used as surface boundary conditions to calculate the interior structure and evolution of 0.001–0.075 M⊙ objects. Our models include several key improvements to the input physics used in previous models available in the literature. Most notably, the use of a new H–He equation of state including ab initio quantum molecular dynamics calculations has raised the mass by ~1−2% at the stellar–substellar boundary and has altered the cooling tracks around the hydrogen and deuterium burning minimum masses. A second key improvement concerns updated molecular opacities in our atmosphere model ATMO, which now contains significantly more line transitions required to accurately capture the opacity in these hot atmospheres. This leads to warmer atmospheric temperature structures, further changing the cooling curves and predicted emission spectra of substellar objects. We present significant improvement for the treatment of the collisionally broadened potassium resonance doublet, and highlight the importance of these lines in shaping the red-optical and near-infrared spectrum of brown dwarfs. We generate three different grids of model simulations, one using equilibrium chemistry and two using non-equilibrium chemistry due to vertical mixing, all three computed self-consistently with the pressure-temperature structure of the atmosphere. We show the impact of vertical mixing on emission spectra and in colour-magnitude diagrams, highlighting how the 3.5−5.5 μm flux window can be used to calibrate vertical mixing in cool T–Y spectral type objects.

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22 pole cryogenic ion trap Piège à ions Niobates Dftb Agrégats moléculaires Electronic structure Argon Amorphous MINI-SYMPOSIUM SPECTROSCOPY OF INTERFACES Car-Parrinello molecular dynamics Density Functional Theory CAH Photon-dominated region PDR Excited states Ion trap Modeling Pesticide Organochlorine pesticides ISM lines and bands MAGNESIUM DEUTERIDE Molecular dynamics GALAXIES Ne tagging spectroscopy PAHS Mass spectrometry Molecular dynamic simulation Energie renouvelable Modélisation DFTB Molecule-photon collisions ISM molecules Infrared ISM EMISSION-SPECTRA Chemical shift Metadynamics Biodegradation DUST Fenhexamide CONSTANTS Approche mixte quantique/classique Molecular data Quantum chemistry POLARIZATION Molecular processes Métamitrone Photoelectron spectra Matrice de gaz rare Astrochemistry Modelling Effets de température Clusters LYING ELECTRONIC STATES Barium Carbon cluster Line profiles / brown dwarfs Nanoparticles IR EMISSION Infrared spectroscopy Force fields Optical spectra Brown dwarfs Argile Molecular clusters Interstellar extinction Molecular dynamics simulations Gold MOLECULE Dynamique Moléculaire Car-Parrinello Au147 Molecular modeling DFT PAH Metamitron Molecular aggregates Planets and satellites atmospheres Nanoparticules Chimie quantique Dynamique moléculaire Carbonaceous grains Auxiliary density functional theory Clay mineral NMR Alanine dipeptide Atrazine FAR-IR Partial least squares Catalyse Photoionisation Methods laboratory molecular Free energy surface Profiles Agrégats protonés CONFIGURATION-INTERACTION Champ de forces PHOTODISSOCIATION REGIONS EXTENDED RED EMISSION Finite-temperature effects INFRARED-EMISSION Fenhexamid Catalysis