Enhancement: Adding Kepler to tutorial

[bmorris3]

Since we'll have PHOENIX model spectra of HAT-P-11 and TRAPPIST-1, it would be fun to model their count rates through a second telescope 🔭 . I'm thinking perhaps we can use Kepler, since (1) Kepler observed both HAT-P-11 (Kepler) and TRAPPIST-1 (K2); (2) it's a space telescope and therefore shouldn't depend on our atmosphere model, making it a good sanity check.

Here's some of the info you'll need to do Kepler:

• Kepler instrument+filter response – remember to use astropy.units.data.download_file to grab this file rather than including it in the PR
• Answer key via MAST: HAT-P-11 measured counts: 2.8e6 e-/s; TRAPPIST-1 measured counts: 5.70e3 e-/s
• Kepler Gain (which you might not need since we're reporting e-/s above): 110 e-/ADU (source)

[tcjansen]

Think we should do this in the same tutorial or a separate tutorial? I'm leaning towards putting it in the same one.

[bmorris3]

I vote same one! 🗳

[bmorris3]

This looks great!