The compact triply eclipsing triple star TIC 209409435 discovered with TESS

@article{Borkovits2020TheCT,
  title={The compact triply eclipsing triple star TIC 209409435 discovered with TESS},
  author={Tam{\'a}s Borkovits and Saul A. Rappaport and T. G. Tan and Robert Gagliano and Thomas Lee Jacobs and X. Huang and Tibor Mitnyan and Franz-josef Hambsch and Thomas G. Kaye and Pierre F. L. Maxted and Andr'as P'al and Allan R. Schmitt},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2020},
  volume={496},
  pages={4624-4636}
}
We report the discovery in $TESS$ Sectors 3 and 4 of a compact triply eclipsing triple star system. TIC 209409435 is a previously unknown eclipsing binary with a period of 5.717 days, and the presence of a third star in an outer eccentric orbit of 121.872 day period was found from two sets of third-body eclipses and from eclipse timing variations. The latter exhibit signatures of strong 3rd-body perturbations. After the discovery, we obtained follow-up ground-based photometric observations of… 
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