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About

S. Poshyachinda is an observational astrophysicist whose work centers on eclipsing binary systems and the development of astronomical instrumentation. Their major contributions include detailed photometric studies of short-period contact binaries and white dwarf–M dwarf eclipsing systems, with a particular focus on eclipse timing variations (ETVs) that reveal orbital dynamics and potential third-body companions. Poshyachinda’s most cited paper, “RW Doradus: A solar-type shallow contact binary with a new orbital period investigation” (2019, 13 citations), presents new CCD light curves from the PROMPT-8 robotic telescope in Chile, offering fresh insights into the orbital evolution of this 0.285-day binary. Their follow-up work on RR Cae (2023, 7 citations) combines TESS data with ground-based photometry to model the binary and detect subtle timing variations—a key technique for probing circumbinary planets or stellar evolution. Beyond observational studies, Poshyachinda contributed to the opto-mechanical design of an all-spherical five-lens focal reducer for Thailand’s 2.3 m National Telescope, enhancing its wide-field imaging capability. This blend of hands-on instrumentation and binary-star research underscores their role in advancing both Thai astronomy and the broader understanding of close binary evolution.