For Kepler-48, -65, -90, and -139, a 1-20 Earth-mass planet could sit stably in the observed gap, but the outer giant cannot tilt it out of transit, disfavoring the secular explanation for the gaps.
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The Gap-Giant Association: Are Planets Hiding in the Gaps?
For Kepler-48, -65, -90, and -139, a 1-20 Earth-mass planet could sit stably in the observed gap, but the outer giant cannot tilt it out of transit, disfavoring the secular explanation for the gaps.