Tweeting the Kepler Dichotomy, feat. Sarah Ballard

@hubbahubble visited my group back in July and told me about an idea she had to study the multi-planet pop. in the Kepler data #RadIdea
— John Asher Johnson (@astrojohnjohn) October 17, 2014

@hubbahubble proposed using the 5-planet system around Kepler-32 as template for systems around M dwarfs, building on Swift et al. (2014)
— John Asher Johnson (@astrojohnjohn) October 17, 2014

She coined it a "self-similarity study" #AwesomeName. What if 4-pl, 3-pl sys are Kepler-32s tilted just a bit, so only some planets transit?
— John Asher Johnson (@astrojohnjohn) October 17, 2014

So @hubbahubble simulated N-planet systems, with free pars: N pl per sys, with mutual inclinations sigma from Fisher dist #MonteCarloFTW
— John Asher Johnson (@astrojohnjohn) October 17, 2014

was able to match # of observed systems with 2+ planets with N=~6 and sig=~2 deg, but underpredicted # of 1-planet systems #ThePlotThickens
— John Asher Johnson (@astrojohnjohn) October 17, 2014

I suggested a mixture model with fraction f of planets in multi-pl systems and (1-f) in singles. JJ with the assist, Sarah w the finish!
— John Asher Johnson (@astrojohnjohn) October 17, 2014

A few months later, Ballard & Johnson is born http://t.co/uMOnEzwXDU We find that ~half of systems are in multis w 5+ well+aligned planets
— John Asher Johnson (@astrojohnjohn) October 17, 2014

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