Tutorials

Sagan School 2023: Interpretting JWST Transmission Spectra

• Basics of analyzing transmission spectra with JWST
• Check PICASO Imports
  • Make sure we have the right data
• Observed Spectrum
• Spectra Ingredients
  • PICASO Basics
• Basic Inputs
  • Cross Section Connection
  • Set Basic Planet and Stellar Inputs
  • Set Climate and Chemistry
• Creating a Transmission Spectrum
  • First Run PICASO
  • Our Spectra
  • Model Investigation
• Increasing Model Complexity to Improve Fit: Chemistry, Climate, Clouds
  • Define Goodness of Fit
  • Revisiting Chemistry Assumption
  • Revisiting Climate Assumption
  • Revisiting Cloudless assumption
• Mystery absorbery : How to diagnose unfit spectral regions
  • Explore opacity database
  • Create Model with Fixed Chemistry
• Xarray output (.nc) the model
  • Save W39 case w/o SO2
  • Save SO2 case
• Cloud Modeling with Virga

ESO ATMO 2021

• Tutorial Material
  • What happens to a transit (transmission+emission) spectrum as a function of temperature
  • What molecules are most important to planetary spectroscopy?
  • Where in temperature space do chemical transitions seem to take place?
  • Is this molecule affecting my spectrum?
  • Understanding Models in the Context of Observing Modes
  • Adding Clouds to the Story using Virga

Early Release Workshop 2021

• Setup PICASO
• Basic Inputs
  • Cross Section Connection
  • Set Basic Planet and Stellar Inputs
• Toy Models
  • How does climate structure influence resultant thermal flux?
  • How does absorption influence resultant thermal flux?
  • How to determine what pressures you are sensitive to?
• Parameterized Pressure-Temperature Profiles
• Combing parameterized climate with chemistry
• Combing parameterized climate with chemistry AND clouds
  • Adding a box model cloud
• References

Sagan School 2021: Spectroscopy of Young Planets

• Building Intuition for Spectroscopy
  • Planet Evolution Tracks
  • Create and analyze the spectrum of a planet along this evolution track
  • How to dissect a planetary spectrum
  • References
• Differentiating Formation Scenarios
  • Planet Evolution Tracks in the Context of Planet Discoveries
  • Analyze the spectra of two planets with same age and luminosity
  • Application of Spectroscopy Analysis Skills
  • References
• What Happens to Atmospheres as They Cool
  • What happens to an observable atmospheric spectrum as the planet ages
  • What molecules are most important to planetary spectroscopy?
  • Where in temperature space do chemical transitions seem to take place?
• How Clouds Affect Planet Spectra
  • How do clouds affect an atmospheric spectrum compared to the cloud free cases?
  • What is the dominant cloud species for each case?
  • Plotting the optical contribution from the cloud in relation to the molecular gas
  • References

Sagan School 2020: Writing a JWST Proposal

• Initial Setup
  • Download Files and Install Extra Packages beyond PICASO
• What accuracy in planet properties do I need?
  • Using Exoplanet Archive API to Query Confirmed Targets
• What tools do I need? How do I use them?
  • Use PandExo to run initial constant \((R_p/R_*)^2\) to determine approx precision
  • Use PICASO to determine first guess atmospheric transmission signal
  • Check Exo.MAST for available data so we can validate our assumptions
  • Use PICASO to determine first guess atmospheric emission signal
  • Can an atmosphere be detected: Addressing cloud concerns and quantifying statistical significance in transmission
  • Can an atmosphere be detected: Addressing unknown climate and quantifying statistical significance in emission
  • Can a specific molecule be detected?
  • Can any physical parameters be constrained? Information content theory for initial constraint estimates