Fomalhaut

Fomalhaut is a bright, young white star about 25 light-years from Earth in the constellation Piscis Austrinus. Its circumstellar debris disk and candidate planets make it a prominent subject of planetary-system research.

Piscis Austrinus: Piscis Austrinus is a southern constellation whose brightest star is Fomalhaut. Fomalhaut’s position and traditional name are tied to this constellation.
Fomalhaut b: Fomalhaut b is a transient point source once interpreted as a directly imaged exoplanet, now understood as an expanding dust cloud. Its interpretation changed as repeated observations failed to show the behavior expected of a planet.
Poynting–Robertson effect: The Poynting–Robertson effect is the gradual inward drift of orbiting dust caused by radiation pressure and light aberration. It helps determine how quickly small grains in Fomalhaut’s disk migrate toward the star.
Alpha Piscis Austrini: Alpha Piscis Austrini is the Bayer designation for Fomalhaut, the brightest star in Piscis Austrinus. This designation identifies Fomalhaut by its rank in its constellation.
Planet formation: Planet formation is the process by which planets grow from gas, dust, and solid bodies around young stars. Fomalhaut’s debris structures preserve evidence of the system’s planet-forming history.
Main sequence: The main sequence is the long-lived phase in which stars fuse hydrogen in their cores. Fomalhaut is a young A-type star still burning hydrogen on the main sequence.
Fomalhaut's debris disk: Fomalhaut’s debris disk is a bright, sharply bounded ring of circumstellar dust and planetesimal material. The ring’s shape and brightness reveal structure within Fomalhaut’s planetary system.
Radiation pressure: Radiation pressure is the force exerted when electromagnetic radiation transfers momentum to matter. Fomalhaut’s luminous star can push small dust grains out of the system.
Arabic star names: Arabic star names are traditional stellar names derived from Arabic-language astronomy and transmitted through later catalogues. Fomalhaut’s name comes from an Arabic phrase meaning “mouth of the fish.”
Exozodiacal dust: Exozodiacal dust is warm dust orbiting a star in a region analogous to the Solar System’s zodiacal cloud. Warm inner dust around Fomalhaut may reveal ongoing collisions close to the star.

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Epsilon EridaniCompared with: Its debris ring offers a useful comparison for interpreting structures around Epsilon Eridani.