Exoplanetary Geophysics -- An Emerging Discipline
Gregory Laughlin, Jack J. Lissauer

TL;DR
This paper reviews the discovery, classification, properties, and formation theories of extrasolar planets, highlighting observational techniques, current findings, and future research directions in the emerging field of exoplanetary geophysics.
Contribution
It provides a comprehensive overview of exoplanet detection methods, planetary classifications, and discusses the implications for understanding planet formation and composition.
Findings
Identification of diverse exoplanet categories like hot Jupiters and ungiants.
Insights into planetary radius anomalies and size variations.
Use of transit observations to analyze atmospheric properties.
Abstract
Thousands of extrasolar planets have been discovered, and it is clear that the galactic planetary census draws on a diversity greatly exceeding that exhibited by the solar system's planets. We review significant landmarks in the chronology of extrasolar planet detection, and we give an overview of the varied observational techniques that are brought to bear. We then discuss the properties of the currently known distribution, using the mass-period diagram as a guide to delineating hot Jupiters, eccentric giant planets, and a third, highly populous, category that we term "ungiants", planets having masses less than 30 Earth masses and orbital periods less than 100 days. We then move to a discussion of the bulk compositions of the extrasolar planets. We discuss the long-standing problem of radius anomalies among giant planets, as well as issues posed by the unexpectedly large range in sizes…
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