CzeV1731: The unique doubly eclipsing quadruple system

TL;DR

This paper reports the discovery and characterization of CzeV1731, a rare doubly eclipsing quadruple star system with well-determined orbits and stellar parameters, providing valuable insights into complex stellar configurations.

Contribution

It presents the first detailed analysis of a doubly eclipsing quadruple system with all four stellar masses measured and orbital parameters characterized, expanding knowledge of multiple star systems.

Findings

All four stars are main-sequence F/G types.

Inner binaries are well-detached and circular.

Mutual orbit period is about 34 years with eccentricity 0.38.

Abstract

We report the discovery of the relatively bright (V = 10.5 mag), doubly eclipsing 2+2 quadruple system CzeV1731. This is the third known system of its kind, in which the masses are determined for all four stars and both the inner and outer orbits are characterized. The inner eclipsing binaries are well-detached systems moving on circular orbits: pair A with period PA = 4.10843 d and pair B with PB = 4.67552 d. The inner binaries contain very similar components (q = 1.0), making the whole system a so-called double twin. The stars in pair B have slightly larger luminosities and masses and pair A shows deeper eclipses. All four components are main-sequence stars of F/G spectral type. The mutual orbit of the two pairs around the system barycenter has a period of about 34 yr and an eccentricity of about 0.38. However, further observations are needed to reveal the overall architecture of the whole system, including the mutual inclinations of all orbits. This is a promising target for interferometry to detect the double at about 59 mas and dMbol < 1 mag. (The RV and ETV data available via CDS)