2021-03-03

best RV observing strategies

I really solidly did actual coding today on a real research problem, which I have been working on with Megan Bedell (Flatiron) for a few years now. The context is: extreme precision radial-velocity surveys. The question is: Is there any advantage to taking one observation every night relative to taking K observations every K nights? I succeeded!

I can now show that the correlations induced in adjacent observations by asteroseismic p-modes makes it advantageous to do K observations every K nights. Why? Because you can better infer the center-of-mass motion of the star with multiple, coherently p-mode-shifted observations. The argument is a bit subtle, but it will have implications for Terra Hunting and EXPRES and other projects that are looking for long-period planets.

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