Abstract Details
| Name: Kapil Kumar Affiliation: Physical Research Laboratory, Ahmedabad, India Conference ID: ASI2025_617 Title : Indigenous Innovations for Achieving Sub m/s Precision in High-Resolution Spectroscopy with PARAS-2 Authors and Co-Authors : 1 Kapil Kumar 2 Kevi Kumar Lad 3 Prasad Neelam 4 Rishikesh Sharma 5 Prof. Abhijit Chakraborty Abstract Type : Poster Abstract Category : Facilities, Technologies and Data science Abstract : Achieving the precision required to detect Earth- to super-Earth-sized planets via radial velocity (RV) measurements demands an accuracy range of 10–30 cm/s, which necessitates exceptional long-term instrument stability in high-resolution Doppler spectroscopy. This work introduces the optical and opto-mechanical design and implementation of a double scrambler integrated with octagonal fibers, developed for the PARAS-2 high-resolution spectrograph (R ~100,000) at the Physical Research Laboratory (PRL) in Ahmedabad. The scrambler delivers significant scrambling gains (SGs), ensuring uniform and stable slit illumination by minimizing input-induced illumination variations on the fiber output. Consequently, this innovation enhances the stability of the spectrograph’s instrument profile, leading to improved Doppler precision. Additionally, the system is equipped with an Atmospheric Dispersion Corrector (ADC), utilizing counter-rotating prisms in the Cassegrain unit to counteract atmospheric dispersion effects. Operating successfully since May 2023, the ADC stabilizes RV accuracy under varying atmospheric conditions, advancing the capabilities of PARAS-2 for precise RV measurements in exoplanet detection. This development exemplifies India’s technological advancements under the "Make in India" initiative, contributing significantly to high-precision astronomical instrumentation. |