Ayush Moharana

Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences

Session VI: Stars, star systems and interstellar matter

Thursday 14th September 2023 10:11 – 10:24

abstract:
Compact Hierarchical Triple (CHT) is a triple system where a third star orbits around an inner binary in an orbit of fewer than 1000 days. This allows us to observe their dynamic evolution in the timescale of a few years. These systems were thought to be rare but thanks to space-based photometric missions we are discovering more of these systems. If we combine photometry with spectroscopy we are also able to obtain accurate stellar, orbital, and atmospheric parameters of all three stars in the system. In our work, we use time-series spectroscopic observations from different high-resolution spectrographs. We use spectral disentangling to obtain individual spectroscopic parameters and use them to constrain the evolution of the systems. Using radial velocities we constrain the current dynamics and use numerical integrations to predict their future dynamical evolution. We present our analysis of a few stars in our sample and talk about the different evolution scenarios visible in the systems and the effect of the third star on these scenarios.