Dark planets
Pro Research Analysisby 
Searched over 200M research papers for "dark planets"
Dark Planets: An Overview of Recent Research
Dark Compact Planets: Formation and Characteristics
Recent studies have explored the formation of dark compact planets, which are unique celestial bodies composed of a mixture of dark matter and ordinary matter, such as neutron star material and white dwarf material. These planets are stabilized by the mutual presence of dark matter and compact star matter. For weakly interacting dark matter, these planets can have Earth-like masses with radii ranging from a few kilometers to a few hundred kilometers. In contrast, strongly interacting dark matter can result in dark compact planets with Jupiter-like masses but with much smaller radii of a few hundred kilometers. These unusual characteristics suggest that dark compact planets could be detected by observing exoplanets with unusually small radii .
The WASP-47 System: Dark Planets and Low Albedo
The WASP-47 planetary system provides a fascinating case study of dark planets. This system includes both compact planetary orbits and a giant planet on an eccentric orbit within the habitable zone. Analysis of precision photometry from the K2 mission has revealed that the inner-most planets in the WASP-47 system have low albedos, indicating they are "dark" planets. Specifically, WASP-47b has a geometric albedo of 0.016, with an upper limit of 0.17, while WASP-47e also shows signs of a low albedo. These findings contribute to the growing number of dark, short-period giant planets, which are ideal for studying the dependence of low albedo on atmospheric composition .
Dark Matter and Planetary Systems
The influence of dark matter on planetary systems has been a subject of significant research. For instance, the high precision of the planetary ephemeris EPM2011 has allowed for the exploration of small effects in the solar system, including the potential gravitational influence of dark matter. However, the density of dark matter within the solar system is estimated to be very low, with a mass inside the orbit of Saturn being less than 7.9 × 10^-11 M☉ . Additionally, studies have suggested that dark matter could accumulate in planets, such as Earth, through nuclear scattering, potentially heating the planet through dark matter annihilation .
Dark Matter in the Solar System: Theories and Observations
There is little direct evidence for dark matter within the solar system, but theoretical models suggest its presence in the form of fossil planetesimals. These could exist in an extended spherical cloud or a flat disk beyond the outer planets. The extended cloud is likely the source of new comets, while the disk could be the source of Jupiter-family comets. Despite these theories, the existence of a tenth planet, Planet X, or a companion star, Nemesis, remains improbable due to the lack of significant observational evidence .
Imaging Dark Planets: Technological Advances
Advancements in imaging technology are crucial for detecting dark planets. The Ames Coronagraph Experiment has demonstrated the potential of Spatial Linear Dark Field Control (LDFC) for imaging extrasolar planets in reflected light. This technique maintains a deep, temporally correlated null of the stellar halo, enabling the imaging of Jovian planets around Sun-like stars and exo-Earths around low-mass stars. LDFC has shown promise in maintaining high-contrast imaging, which is essential for observing dark planets .
Conclusion
The study of dark planets, whether through their unique formation involving dark matter or their low albedo characteristics, is a rapidly evolving field. Advances in observational technology and theoretical models continue to enhance our understanding of these mysterious celestial bodies. As research progresses, the detection and characterization of dark planets will provide deeper insights into the complex dynamics of planetary systems and the role of dark matter in the universe.
Sources and full results
Most relevant research papers on this topic