Study of doubly eclipsing quadruples ─ I. Methodology and results for 10 Northern sky systems

Doubly eclipsing quadruple systems provide an excellent opportunity to analyse multiple stellar systems and their evolutionary processes. However, their fundamental parameters are derived in only a few cases. We conduct new observations and study 10 doubly eclipsing 2+2 candidates in the Northern sky. The new ground-based measurements are combined with TESS and archival data from available additional surveys (ASAS-SN, ZTF, and SuperWASP). We detrend and disentangle the light curves to derive precise minima timings. Further modelling is made using the PHOEBE 0.32 software package. Orbital period analysis using the O−C diagrams reveals seven candidates as newly confirmed quadruple systems. We identify ASASSN-V J020003.56+452605.2 as a blend of two independent binaries. The spectral analysis is carried out for ASASSN-V J233336.79+615012.0, and all four components and their radial velocities are measured from high-resolution spectra. Notably, 2MASS J04380244+5543535 is confirmed as a quadruple system with an additional detected cyclic O−C variation.