A Search for Additional Bodies in the GJ 1132 Planetary System from 21 Ground-based Transits and a 100 Hour Spitzer Campaign
Jason A Dittmann, Jonathan M Irwin, David Charbonneau, Zachory K, Berta-Thompson, Elisabeth R Newton

TL;DR
This study searches for additional planets or moons in the GJ 1132 system using ground-based and space-based transit observations, finding no evidence of other bodies and refining the system's planetary parameters.
Contribution
It provides the first combined ground and space-based transit analysis of GJ 1132, setting stringent limits on additional bodies and refining planetary and stellar parameters.
Findings
Excluded transits of additional Mars-sized bodies with 99.7% confidence
Refined the radius of GJ 1132b to 1.130 ± 0.056 Earth radii
No evidence found for transit timing variations indicating additional planets
Abstract
We present the results of a search for additional bodies in the GJ 1132 system through two methods: photometric transits and transit timing variations of the known planet. We collected 21 transit observations of GJ 1132b with the MEarth-South array since 2015. We obtained 100 near-continuous hours of observations with the Space Telescope, including two transits of GJ 1132b and spanning 60\% of the orbital phase of the maximum period at which bodies coplanar with GJ 1132b would pass in front of the star. We exclude transits of additional Mars-sized bodies, such as a second planet or a moon, with a confidence of 99.7\%. When we combine the mass estimate of the star (obtained from its parallax and apparent band magnitude) with the stellar density inferred from our high-cadence light curve (assuming zero eccentricity), we measure the stellar radius of GJ 1132 to be…
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