Example application: joint fit of RV and astrometric data

[ericagol]

@dfm The planet candidate &epsilon Indi A b has a claimed detection in combined RV and astrometric data. This might be an interesting case to study with exoplanet:

https://arxiv.org/abs/1910.06804

although this star is active:

https://arxiv.org/abs/1803.08163

[ericagol]

And also join fit of direct-imaging and astrometric data:

https://arxiv.org/abs/1910.10169