V907 Sco Switched to the Eclipsing Mode Again
P. Zasche, D. Vokrouhlick\'y, B. N. Barlow, M. Ma\v{s}ek

TL;DR
This study uses recent satellite and ground data to analyze the unique triple star system V907 Sco, revealing its orbital parameters, eclipse behavior, and predicting future eclipsing phases to improve understanding of its dynamics.
Contribution
The paper provides new and refined measurements of the masses and orbital parameters of V907 Sco, and explains the eclipse switching mechanism through orbital inclination and precession analysis.
Findings
Inner binary masses: 2.74 and 2.56 solar masses
Third star mass: 1.06 solar masses
Nodal precession period: 63.5 years
Abstract
V907 Scorpii is a unique triple system in which the inner binary component has been reported to have switched on and off eclipses several times in modern history. In spite of its peculiarity, observational data on this system are surprisingly scarce. Here we make use of the recent Transiting Exoplanet Survey Satellite observations, as well as our own photometric and spectroscopic data, to expand the overall data set and study the V907 Sco system in more detail. Our analysis provides both new and improved values for several of its fundamental parameters: (i) the masses of the stars in the eclipsing binary are 2.74 +/- 0.02 M_0 and 2.56 +/- 0.02 M_0; and (ii) the third component is a solar-type star with mass 1.06 +/-0.11 M_0 (90% C.L.), orbiting the binary on an elongated orbit with an eccentricity of 0.47 +/- 0.02 and a period of 142.01 +/- 0.05 days. The intermittent intervals of time…
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