Explore Exoplanet Atmospheres

Investigate the atmospheres of planets outside our solar system, then make a pitch for what exoplanet spectra you’d like to capture with the James Webb Space Telescope.

Comparative Exoplanetology

Now that you’ve examined WASP-17b, let’s look at some other exoplanets to see how atmospheric conditions vary among them. All these exoplanets were observed with the Hubble Space Telescope (HST) in visible and near-IR wavelengths. A few of the exoplanets also have low-resolution, mid-IR data from the Spitzer Space Telescope.

Consistent with what you learned earlier, almost all the exoplanet spectra featured here are for Hot Jupiters. One planet available here, K2-18b, is a "Super Earth."

Spectrum Tool.

  1. Under Source 1, choose a transmission spectrum of any of the other exoplanet targets. Adjust the wavelength stretch as needed to view the entire spectrum.
  2. As with WASP-17b, explore comparison spectra for Atoms and Molecules under Source 2 to complete the Atmospheric Chemistry columns in your Notebook table.
  3. Explore comparison spectra for Exoplanet Models to complete the "Weather" columns in your Notebook table.
  4. Complete these steps for a second exoplanet target of your choice.

Spectrum Notebook. Answer these questions in your Notebook.

  1. Complete the table with an analysis of the Atmospheric Chemistry and “Weather” for two additional exoplanets and describe your evidence.
  2. For your chosen exoplanets, elaborate on any questions or challenges you had in filling out the evidence for your conclusions in the chart.
  3. How did your two exoplanet spectra compare? Describe which target had better resolution or data quality, which was easier to interpret, and why.
Source 1:
 
Brightness
Full-intensity spectrum backgroundTransparency increases or decreases based on chart intensity, hiding or revealing the background
Left axis ticks
Spectrum intensity vs wavelength chart
Bottom axis ticks
Wavelength (microns)
Source 2:
 
Brightness
Full-intensity spectrum backgroundTransparency increases or decreases based on chart intensity, hiding or revealing the background
Left axis ticks
Spectrum intensity vs wavelength chart
Bottom axis ticks
Wavelength (microns)