Kepler-90: Giant Transit-timing Variations Reveal a Super-puff

@article{Liang2020Kepler90GT,
  title={Kepler-90: Giant Transit-timing Variations Reveal a Super-puff},
  author={Yan Liang and Jakob Robnik and Uros Seljak},
  journal={The Astronomical Journal},
  year={2020},
  volume={161}
}
Exoplanet transit-timing variations (TTVs) caused by gravitational forces between planets can be used to determine planetary masses and orbital parameters. Most of the observed TTVs are small and sinusoidal in time, leading to degeneracies between the masses and orbital parameters. Here we report a TTV analysis of Kepler-90g and Kepler-90h, which exhibit large TTVs up to 25 hr. With optimization, we find a unique solution that allows us to constrain all of the orbital parameters. The best-fit… 

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