Data analysis of laboratory photometry experiments with GSENSE 1081BSI CMOS Detectors

The Earth 2.0 (ET) mission, led by China, aims to detect over 50000 exoplanets, including potentially habitable Earth-like planets around Sun-like stars (“Earth 2.0s”), cold low-mass planets, and free-floating planets. The mission will employ six 28-cm telescopes to conduct ultra-high-precision photometric monitoring for the detection of transiting planets. To verify that the telescopes can reliably detect exoplanet transit events, we have developed a high-precision photometry testbed. This system evaluates selected CMOS detectors for their ability to detect Earth 2.0 transit signals, specifically those exhibiting photometric variations at the 84-ppm level. This report presents the laboratory data processing and analysis pipeline. Preliminary results show that, for simulated sources equivalent to a 12.5-mag Sun-like star, a photometric precision of 10 ppm can be achieved over a 6.5-hour timescale. Moreover, we have successfully recovered injected Earth 2.0-like transit signals.