@article {28371, title = {CzeV1731: The unique doubly eclipsing quadruple system}, volume = {642}, year = {2020}, month = {2020/10/1}, pages = {A63}, 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 ΔMbol < 1 mag.

The RV and ETV data, and the light curves are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/642/A63}, keywords = {Astrophysics - Solar and Stellar Astrophysics, binaries: eclipsing, binaries: spectroscopic, stars: fundamental parameters}, isbn = {0004-6361}, url = {https://ui.adsabs.harvard.edu/abs/2020A\&A...642A..63Z}, author = {Zasche, P. and Henzl, Z. and Lehmann, H. and Pepper, J. and Powell, B. P. and Kostov, V. B. and Barclay, T. and Wolf, M. and Ku{\v c}{\'a}kov{\'a}, H. and Uhla{\v r}, R. and Ma{\v s}ek, M. and Palafouta, S. and Gazeas, K. and Stassun, K. G. and Gaudi, B. S. and Rodriguez, J. E. and Stevens, D. J.} }