
TL;DR
This review discusses recent advances in high-contrast adaptive optics imaging for detecting and studying giant exoplanets, including survey results, discoveries, and future prospects for understanding planetary demographics.
Contribution
It provides a comprehensive overview of observational progress, survey results, and statistical analysis of giant planet occurrence rates from high-contrast imaging.
Findings
The occurrence rate of 5-13 Mjup companions at 30-300 AU is about 0.6%.
Giant planets are as rare as hot Jupiters around Sun-like stars.
No significant trend in planet frequency with host star mass was observed.
Abstract
High-contrast adaptive optics imaging is a powerful technique to probe the architectures of planetary systems from the outside-in and survey the atmospheres of self-luminous giant planets. Direct imaging has rapidly matured over the past decade and especially the last few years with the advent of high-order adaptive optics systems, dedicated planet-finding instruments with specialized coronagraphs, and innovative observing and post-processing strategies to suppress speckle noise. This review summarizes recent progress in high-contrast imaging with particular emphasis on observational results, discoveries near and below the deuterium-burning limit, and a practical overview of large-scale surveys and dedicated instruments. I conclude with a statistical meta-analysis of deep imaging surveys in the literature. Based on observations of 384 unique and single young (5--300~Myr) stars…
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