Modelling the spectra of planets, brown dwarfs and stars using vstar

  title={Modelling the spectra of planets, brown dwarfs and stars using vstar},
  author={Jeremy Bailey and Lucyna Kedziora-Chudczer},
  journal={Monthly Notices of the Royal Astronomical Society},
We describe a new software package capable of predicting the spectra of Solar system planets, exoplanets, brown dwarfs and cool stars. The Versatile Software for Transfer of Atmospheric Radiation (vstar) code combines a line-by-line approach to molecular and atomic absorption with a full multiple scattering treatment of radiative transfer. vstar is a modular system incorporating an ionization and chemical equilibrium model, a comprehensive treatment of spectral line absorption using a data base… 
Polarized radiative transfer in planetary atmospheres and the polarization of exoplanets
We describe the incorporation of polarized radiative transfer into the atmospheric radiative transfer modelling code VSTAR (Versatile Software for Transfer of Atmospheric Radiation). Using a vector
Atmospheres From Very Low-Mass Stars to Extrasolar Planets
Within the next few years, several instruments aiming at imaging extrasolar planets will see first light. In parallel, low mass planets are being searched around red dwarfs which offer more favorable
The Dawes Review 3: The Atmospheres of Extrasolar Planets and Brown Dwarfs
  • J. Bailey
  • Geology, Physics
    Publications of the Astronomical Society of Australia
  • 2014
Abstract The last few years has seen a dramatic increase in the number of exoplanets known and in the range of methods for characterising their atmospheric properties. At the same time, new
The effective temperature scale of M dwarfs
Context. Despite their large number in the Galaxy, M dwarfs remain elusive objects and the modeling of their photospheres has long remained a challenge (molecular opacities, dust cloud formation).
Empirical Line Lists and Absorption Cross Sections for Methane at High Temperatures
Hot methane is found in many "cool" sub-stellar astronomical sources including brown dwarfs and exoplanets, as well as in combustion environments on Earth. We report on the first high-resolution
VSTAR Modelling of the Infrared Spectrum of Uranus
Summary: We modelled the H-band spectrum obtained with the Infrared Imaging Spectrograph (IRIS2) at the Anglo-Australian Telescope in order to infer the cloud structure and composition of the
Spectrum of hot methane in astronomical objects using a comprehensive computed line list
It is demonstrated that proper inclusion of the huge increase in hot transitions which are important at elevated temperatures is crucial for accurate characterizations of atmospheres of brown dwarfs and exoplanets, especially when observed in the near-infrared.
ARTS, the Atmospheric Radiative Transfer Simulator – version 2.2, the planetary toolbox edition
Abstract. This article describes the latest stable release (version 2.2) of the Atmospheric Radiative Transfer Simulator (ARTS), a public domain software for radiative transfer simulations in the
Atmospheric Modelling for the Removal of Telluric Features from Infrared Planetary Spectra
The effects of telluric absorption on infrared spectra present a problem for the observer. Strong molecular absorptions from species whose concentrations vary with time can be particularly
Connecting the dots: a versatile model for the atmospheres of tidally locked Super-Earths
Radiative equilibrium temperatures are calculated for the troposphere of a tidally locked Super-Earth based on a simple greenhouse model, using Solar System data as a guideline. These temperatures


Theoretical Spectra and Atmospheres of Extrasolar Giant Planets
We present a comprehensive theory of the spectra and atmospheres of irradiated extrasolar giant planets. We explore the dependences on stellar type, orbital distance, cloud characteristics, planet
A new model for brown dwarf spectra including accurate unified line shape theory for the Na I and K I resonance line profiles
We present the first brown dwarf atmosphere models based on theoretical calculations of absorption profiles of sodium and potassium perturbed by helium and molecular hydrogen. The synthetic spectra
TiO and H2O Absorption Lines in Cool Stellar Atmospheres
We compare the structures of model atmospheres and synthetic spectra calculated using different line lists for TiO and water vapor. We discuss the effects of different line list combinations on the
Modelling the near-infrared spectra of Jupiter using line-by-line methods
We have obtained long-slit, infrared spectra of Jupiter with the Anglo-Australian Telescope in the K and H bands at a resolving power of 2260. Using a line-by-line, radiative transfer model with the
Towards simulation of high temperature methane spectra
Methane plays a central role in gas layers of temperatures up to around 3000 K in a number of astrophysical objects ranging from giant planets to brown dwarfs, over proto-solar nebulae, to several
Using a model for refractory clouds, a novel algorithm for handling them, and the latest gas-phase molecular opacities, we have produced a new series of L and T dwarf spectral and atmosphere models
Spectropolarimetric signatures of Earth-like extrasolar planets
We present results of numerical simulations of flux F and degree of polarization P of light that is reflected by Earth–like extrasolar planets orbiting solar type stars. Our results are presented as
Line and Mean Opacities for Ultracool Dwarfs and Extrasolar Planets
Opacities and chemical abundance data are crucial ingredients of ultracool dwarf and extrasolar giant planet atmosphere models. We report here on the detailed sources of molecular opacity data
A grid of MARCS model atmospheres for late-type stars. I. Methods and general properties
Context. In analyses of stellar spectra and colours, and for the analysis of integrated light from galaxies, a homogeneous grid of model atmospheres of late-type stars and corresponding flux spectra
Calculations of the Far-Wing Line Profiles of Sodium and Potassium in the Atmospheres of Substellar-Mass Objects
At the low temperatures achieved in cool brown dwarf and hot giant planet atmospheres, the less refractory neutral alkali metals assume an uncharacteristically prominent role in spectrum formation.