Computational Tools in Planetary Astrophysics - Fall 2017

Explore a limited subset of computational tools in planetary astrophysics used for modeling planetary transits, secondary eclipses, phase curves, radial velocities, Bayesian parameter estimation, and atmospheric modeling. Tools include BATMAN, SPIDERMAN, RadVel, e.emcee, and Exo_Transmit, each serving unique purposes in the study of exoplanets and their atmospheres.

• - Planetary Astrophysics
• - Computational Tools
• - Exoplanets
• - Transit Modeling
• - Atmospheric Spectra

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1. (A limited subset of the many) COMPUTATIONAL TOOLS IN PLANETARY ASTROPHYSICS C249: PLANETARY ASTROPHYSICS COURTNEY DRESSING FALL 2017

2. BATMAN: transit modeling package developed by Laura Kreidberg Link: https://github.com/lkreidberg/batman Uses: Fit transit light curves How to learn: Download & install the package Try the tutorial Change the input parameters & see what happens Challenge: fit planetary transit (pset #2)

3. SPIDERMAN: secondary eclipse & phase curve modeler developed by Tom Louden Link: spiderman.readthedocs.io/en/latest/ack.html Uses: Fit secondary eclipses & phase curves How to learn: Download & install the package Read the docs Work through the quickstart example Challenge: reproduce a published phase curve or secondary eclipse measurement

4. RadVel: radial velocity simulator Developed by BJ Fulton & Erik Petigura Link: radvel.readthedocs.io/en/latest/ Uses: Fit radial velocity data sets How to learn: Download & install the package Try the tutorial Make the problem more complicated by changing the data set Challenge: fit radial velocities (pset #3)

5. e emcee mcee: Markov Chain Monte Carlo package developed by Daniel Foreman-Mackey Link: dfm.io/emcee/current/ Uses: Bayesian parameter estimation How to learn: Download & install the emcee package using pip Try the tutorial Make the problem more complicated by changing the data set Challenges: determine errors on light curve fit (pset #2) Determine errors on RV fit (pset #3)

6. Exo_Transmit Exo_Transmit: atmospheric modeling package developed by Eliza Kempton Link: https://github.com/elizakempton/Exo_Transmit Uses: Generate model transmission spectra How to learn: Download & install the package Try the tutorial Change the input parameters & compare the resulting spectra Challenges: Model the transmission spectrum of your favorite planet Reproduce a published transmission spectrum

7. Other Python Packages ExoData (developed by Ryan Varley) Tool for querying Open Exoplanet Catalogue PyKE (developed by many people at NASA) Tools interacting with data from Kepler, K2, (and soon) TESS python-bls Generates Box Least Squares periodogram Useful for transit searches LombScargle Generates Lomb Scargle periodogram Useful for RV searches