Authors

Khelfi Khaled

Affiliations

Algérie

Abstract

Astronomical observations, from ground-based telescopes on Earth or with spaceborn telescopes, provide direct and indirect evidence of extrasolar planets and circumstellar disks. Since each observational method has its own strengths and weaknesses, researchers need to combine various observational approaches to clarify the diversity of planetary systems. In this chapter, I describe the most frequently used methods, their current status, and their limitations in the detection of extrasolar planets and circumstellar disks.