#astrohackny, day N

At #astrohackny, Ben Weaver (NYU) showed a huge number of binary-star fits to the APOGEE individual-exposure heliocentric radial velocity measurements. He made his code fast, but not yet sensible, in that it treats all possible radial-velocity curves as equally likely, when some are much more easily realized physically than others. In the end, we hope that he can adjust the APOGEE shift-and-add methodology and make better combined spectra.

Glenn Jones (Columbia) and Malz showed some preliminary results building a linear Planck foreground model, using things that look a lot like PCA or HMF. We argued out next steps towards making it a probabilistic model with more realism (the beam and the noise model) and more flexibility (more components or nonlinear functions). Also, the model has massive degeneracies; we talked about breaking those.

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