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Astronomers detect first potential exomoon orbiting a brown dwarf in CD-35 2722 system
Key points
- ESO's VLT detected a moon-like object in the CD-35 2722 system.
- The object orbits a brown dwarf, not a star, challenging definitions.
- It is at least as massive as Jupiter; the brown dwarf is 30x Jupiter's mass.
- This could be the first exomoon discovered outside our Solar System.
Discovery of a Novel Celestial Body
Observations made with the European Southern Observatory’s Very Large Telescope (ESO’s VLT) have revealed evidence for a moon-like object in the CD-35 2722 system. This newly found object, termed an exosatellite, does not orbit a planet, but instead circles a brown dwarf, which itself orbits the star CD-35 2722. If confirmed, this would mark the first 'moon' discovered outside our Solar System.
Challenging Astronomical Definitions
The unique configuration of the CD-35 2722 system blurs the lines of traditional astronomical classifications. The exosatellite is at least as massive as Jupiter, while its host brown dwarf has over 30 times the mass of Jupiter. This challenges conventional definitions, as the object is massive enough to be a planet but orbits a brown dwarf rather than a star, leading researchers to consider it a moon despite its size.
The CD-35 2722 System
The CD-35 2722 system is described as 'super weird' compared to our own Solar System. The primary star, CD-35 2722, has about half the mass of the Sun. A brown dwarf, an object too massive to be a planet but too small to be a star, orbits this star. The newly discovered exosatellite then orbits this brown dwarf, creating a complex hierarchical structure that complicates existing nomenclature.
Implications for Exomoon Research
This potential discovery is significant for the field of exomoon research, as astronomers have been actively trying to detect satellites outside our Solar System. The unusual characteristics of this system highlight the diversity of celestial arrangements beyond our own and necessitate a re-evaluation of how astronomical bodies are categorized based on their mass and orbital relationships.
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Reporting from
Astronomers using the European Southern Observatory’s Very Large Telescope have found evidence of a moon-like object, dubbed an exosatellite, orbiting a brown dwarf in the CD-35 2722 system. This discovery challenges current definitions of planets and moons, as the object is massive enough to be a planet but orbits a brown dwarf, not a star, making it the first potential exomoon found outside our Solar System.