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Fomalhaut is a bright, nearby star surrounded by a vast system of dusty belts—and its once-famous planet candidate, Fomalhaut b, is now best explained as a dispersing cloud of collision debris. Observations from Hubble and the James Webb Space Telescope have made this system a valuable way to study the raw material and structure of planetary systems.
What is Fomalhaut?
Fomalhaut is the brightest star in the southern constellation Piscis Austrinus, or the Southern Fish, and it can be seen without a telescope. NASA gives its distance as about 25 light-years from Earth. Its brightness and relative proximity make it possible for astronomers to study the dusty material around it in detail. NASA’s Webb overview describes it as the brightest naked-eye star in the constellation.
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How did astronomers discover its dusty belts?
The story began with infrared observations. In 1983, NASA’s Infrared Astronomical Satellite (IRAS) detected the dust ring’s infrared signature. In 2004, Hubble’s Advanced Camera for Surveys resolved the outer belt in visible light for the first time. That image showed a sharp inner edge and an offset ring—features that helped prompt the idea that an unseen planet might be shaping the belt. NASA’s Hubble feature includes an updated note on how the interpretation of Fomalhaut b changed.
What did Webb discover around Fomalhaut?
In 2023, the James Webb Space Telescope’s Mid-Infrared Instrument (MIRI) revealed three nested belts, including inner structures that had not previously been resolved. The imaged system extends about 14 billion miles (23 billion kilometers) from the star, roughly 150 times the Earth–Sun distance. Its outermost belt is roughly twice the scale of our Solar System’s Kuiper Belt. NASA’s Webb report describes the observations.
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Hubble’s 2004 image showed the outer belt in visible light; Webb’s MIRI observations revealed additional structure using infrared emission. The belts themselves are observed features. NASA says their shapes are most likely carved by the gravity of unseen planets, but Webb did not directly image planets in the gaps. That explanation is an inference based on how planets shape debris structures in our own Solar System.
Why are the belts important?
The belts contain dust produced by collisions among larger bodies, analogous to asteroids and comets. Studying that debris gives astronomers clues about the larger objects that are otherwise difficult to observe and about how material is organized in a planetary system. András Gáspár, lead author of the Webb study at the University of Arizona, called Fomalhaut “the archetype of debris disks found elsewhere in our galaxy,” noting that it has components similar to those in our own planetary system. NASA’s report includes his description.
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Is Fomalhaut b a planet?
Fomalhaut b was announced in 2008 as a candidate planet, but it is no longer best described as a planet. Hubble observations showed that the source faded and spread out over time. A 2020 peer-reviewed analysis by András Gáspár and George H. Rieke found its changing appearance and motion consistent with a dispersing dust cloud from a catastrophic collision between large planetesimals. That is the best-supported interpretation, though it does not establish every detail of the collision. The 2020 analysis in PNAS reports the findings; NASA’s historical feature carries an editor’s note reflecting the later interpretation.
What is the “great dust cloud” Webb saw?
NASA also reported a separate feature called the “great dust cloud,” which may be evidence of a collision in Fomalhaut’s outer belt. It is not Fomalhaut b: Webb’s feature is distinct from the candidate source Hubble first detected inside the outer ring. NASA distinguishes the two features in its Webb report.
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Fomalhaut observations at a glance
- 1983: IRAS detects the dust ring’s infrared signature.
- 2004: Hubble resolves the outer belt in visible light.
- 2008: Fomalhaut b is announced as a candidate planet.
- 2020: A peer-reviewed analysis finds that Fomalhaut b’s fading and expansion fit a collision-produced dust cloud.
- 2023: Webb MIRI reveals three nested belts and reports the separate “great dust cloud.”
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