Understanding the Depths of Brown Dwarfs and Giant Exoplanets: Modelling Substellar Atmospheres
Lead Research Organisation:
UNIVERSITY OF EXETER
Department Name: Physics
Abstract
The main goal of the project is to develop atmosphere models to interpret observations of
exoplanets and brown dwarfs. Both types of objects are described by the same physics. Brown dwarfs
are particularly interesting to test various physical processes because this family of object are
currently much better observationally constrained than exoplanets.
The project will involve the use of state-of-the-art tools develped in Exeter, namely a one-dimensional
atmospheric code ATMO and the three-dimensional UK Metoffice General Circulation Model. The goal is to
perform further adaptations of these tools to improve the comparison of models with observations. One first aim is to focus
on brown dwarfs and improve our understanding of the role of clouds and other processes in these cool atmospheres.
The ultimate goal is to model a large variety of planets, from giant to Earth-like planets. In particular, the coupling between the dynamics and the chemistry is key for a correct interpretation of observations. For now, observational constraints are only available for exoplanets which are strongly irradiated by their parent star, as current observational techniques favour the detection of exoplanets located very close to their parent stars. Photochemical processes therefore play an important role in determining the atmospheric composition, properties of haze and/or clouds and spectroscopic signatures of these planets. Taking those processes into account in a consistent way within a GCM is critical, not only for guiding the future characterisation of potential biosignatures on exo-Earths, but also for the general understanding of exoplanet atmospheres and the interpretation of available observations.
exoplanets and brown dwarfs. Both types of objects are described by the same physics. Brown dwarfs
are particularly interesting to test various physical processes because this family of object are
currently much better observationally constrained than exoplanets.
The project will involve the use of state-of-the-art tools develped in Exeter, namely a one-dimensional
atmospheric code ATMO and the three-dimensional UK Metoffice General Circulation Model. The goal is to
perform further adaptations of these tools to improve the comparison of models with observations. One first aim is to focus
on brown dwarfs and improve our understanding of the role of clouds and other processes in these cool atmospheres.
The ultimate goal is to model a large variety of planets, from giant to Earth-like planets. In particular, the coupling between the dynamics and the chemistry is key for a correct interpretation of observations. For now, observational constraints are only available for exoplanets which are strongly irradiated by their parent star, as current observational techniques favour the detection of exoplanets located very close to their parent stars. Photochemical processes therefore play an important role in determining the atmospheric composition, properties of haze and/or clouds and spectroscopic signatures of these planets. Taking those processes into account in a consistent way within a GCM is critical, not only for guiding the future characterisation of potential biosignatures on exo-Earths, but also for the general understanding of exoplanet atmospheres and the interpretation of available observations.
People |
ORCID iD |
Isabelle Baraffe (Primary Supervisor) | |
Mark Phillips (Student) |
Studentship Projects
Project Reference | Relationship | Related To | Start | End | Student Name |
---|---|---|---|---|---|
ST/N504063/1 | 01/10/2015 | 31/03/2021 | |||
1786371 | Studentship | ST/N504063/1 | 01/10/2016 | 31/12/2020 | Mark Phillips |
Title | ATMO |
Description | A 1D atmosphere code which solves for the steady state pressure temperature profile of an atmosphere. |
Type Of Material | Computer model/algorithm |
Year Produced | 2015 |
Provided To Others? | Yes |
Impact | Development of brown dwarf and hot Jupiter exoplanet atmosphere model grids. |
Description | Collaboration with Pascal Tremblin |
Organisation | University of Paris-Saclay |
Country | France |
Sector | Academic/University |
PI Contribution | We have been working on grids of models generated using the atmosphere code developed by the collaborator. |
Collaborator Contribution | Teaching on how to use the code and discussion of results. |
Impact | Publications |
Start Year | 2016 |
Description | Pint of Science |
Form Of Engagement Activity | Participation in an activity, workshop or similar |
Part Of Official Scheme? | No |
Geographic Reach | Local |
Primary Audience | Public/other audiences |
Results and Impact | Organised and ran Pint of Science events which brings scientists to give talks at local pubs. |
Year(s) Of Engagement Activity | 2018 |