Today was a low-research day (letters of recommendation), but Elisabeth Andersson (NYU) and I got an optimization working, comparing a batman periodic transit model to a Kepler light curve. I left her with the problem of characterizing the six planets in the Trappist 1 system.
At lunch, Foreman-Mackey (Flatiron) proposed a model for stellar spectra that is intermediate in sophistication and computational complexity between The Cannon and the Eilers (MPIA) GPLVM. He also has a fast implementation in TensorFlow. Most of the TensorFlow speed-up comes from its clever use of GPUs. Late in the day, Bedell proposed that we look for short-lived radioactive isotopes in her Solar twins. That’s a great idea!
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