The Joker: A custom Monte Carlo sampler for binarystar and exoplanet radial velocity data
Abstract
Given sparse or lowquality radialvelocity measurements of a star, there are often many qualitatively different stellar or exoplanet companion orbit models that are consistent with the data. The consequent multimodality of the likelihood function leads to extremely challenging search, optimization, and MCMC posterior sampling over the orbital parameters. The Joker is a custombuilt Monte Carlo sampler that can produce a posterior sampling for orbital parameters given sparse or noisy radialvelocity measurements, even when the likelihood function is poorly behaved. The method produces correct samplings in orbital parameters for data that include as few as three epochs. The Joker can therefore be used to produce proper samplings of multimodal pdfs, which are still highly informative and can be used in hierarchical (population) modeling.
 Publication:

Astrophysics Source Code Library
 Pub Date:
 January 2017
 Bibcode:
 2017ascl.soft01001P
 Keywords:

 Software