Comparisons for Different State-of-art Planet Searching Scenarios: Transit, Radial Velocity and Direct-imaging

Abstract

The vastness of the universe has inspired mankind’s infinite imagination of the exoplanets with living. The exploration of them reflects human beings’ yearning for possible life and the pursuit of a possible future home. From the first detection of an exoplanet in 1992 to the detection of 5,747 exoplanets on August 16, 2024, scholars have worked hard to explore. This study presents typical results of exoplanet detection in recent years, describing in general terms which planet retrieval methods have been used, what results are obtained by each method and which parameters of the planet can be detected. To be specific, three main methods for detecting exoplanets are detailly evaluated, namely the transit, the radial velocity and the direct imaging. By comparing these three methods, detection methods suitable for different types of exoplanets are summarized. According to the analysis, the limitations of current exoplanet detection are summarized based on the results, and future countermeasures are outlined. These results offer a guideline for exoplanet exploration and shed light on understanding the three main methods of detecting exoplanets.