Triply eclipsing triple stars in the northern TESS fields: TICs 193993801, 388459317 and 52041148
T. Borkovits, T. Mitnyan, S. A. Rappaport, T. Pribulla, B. P. Powell,, V. B. Kostov, I. B. B\'ir\'o, I. Cs\'anyi, Z. Garai, B. L. Gary, T. G. Kaye,, R. Kom\v{z}\'ik, I. Terentev, M. Omohundro, R. Gagliano, T. Jacobs, M. H., Kristiansen, D. LaCourse, H. M. Schwengeler

TL;DR
This study reports the discovery and detailed analysis of three new triply eclipsing triple star systems using TESS data, combining photometry, spectroscopy, and archival data to determine their orbital and physical properties with high precision.
Contribution
It introduces a comprehensive photodynamical analysis method for triply eclipsing systems, including the first radial velocity measurements for one system, achieving 1-3% mass accuracy.
Findings
Outer orbital periods identified from archival photometry.
All systems are nearly coplanar within 1-3 degrees.
Outer eccentricities vary from nearly circular to highly eccentric.
Abstract
In this work we report the discovery and analysis of three new triply eclipsing triple star systems found with the TESS mission during its observations of the northern skies: TICs 193993801, 388459317, and 52041148. We utilized the TESS precision photometry of the binary eclipses and third-body eclipsing events, ground-based archival and follow-up photometric data, eclipse timing variations, archival spectral energy distributions, as well as theoretical evolution tracks in a joint photodynamical analysis to deduce the system masses and orbital parameters of both the inner and outer orbits. In one case (TIC 193993801) we also obtained radial velocity measurements of all three stars. This enabled us to `calibrate' our analysis approach with and without `truth' (i.e., RV) data. We find that the masses are good to 1-3% accuracy with RV data and 3-10% without the use of RV data. In all three…
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