TL;DR
This paper defines the boundaries of the Neptunian desert and identifies a new feature called the Neptunian ridge, revealing insights into the evolutionary processes shaping close-in exoplanets.
Contribution
It provides the first clear delineation of the Neptunian desert boundaries and introduces the Neptunian ridge as a new physical feature in the period-radius landscape.
Findings
Identified the Neptunian desert boundaries at a 3σ level.
Discovered the Neptunian ridge at 4.7σ significance.
Suggested high-eccentricity tidal migration as a key process.
Abstract
Atmospheric and dynamical processes are thought to play a major role in shaping the distribution of close-in exoplanets. A striking feature of such distribution is the Neptunian desert, a dearth of Neptunes on the shortest-period orbits. We aimed to define the boundaries of the Neptunian desert and study its transition into the savanna, a moderately populated region at larger orbital distances. We built a sample of planets and candidates based on the Kepler DR25 catalogue and weighed it according to the transit and detection probabilities. We delimited the Neptunian desert as the close-in region of the period-radius space with no planets at a 3 level, and provide the community with simple, ready-to-use approximate boundaries. We identified an overdensity of planets separating the Neptunian desert from the savanna (3.2 days 5.7 days) that…
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