To confirm that the observed signal was indeed caused by a moon, the research team also examined other possible factors. These included apparent periods resulting from errors in corrections for Earth\u2019s orbital motion, seasonal variations in atmospheric conditions, and the effects of the brown dwarf\u2019s own rotation.<\/p>\n
An artist\u2019s concept of a moonlike object (center) orbiting the brown dwarf CD-35 2722 B (right). Researchers refer to this object as an \u201cexosatellite\u201d and describe it as a massive gas giant with a mass at least equal to that of Jupiter.<\/p>\n
Video: ESO\/M. Kornmesser<\/p>\n
Furthermore, calculations of the Roche limit\u2014the boundary beyond which a satellite would be torn apart by the brown dwarf\u2019s tidal forces\u2014and the Hill radius\u2014the radius of the brown dwarf\u2019s gravitational influence\u2014confirmed that the satellite\u2019s orbit falls within a range where it can exist in a physically stable manner.<\/p>\n
According to the researchers, this is the first evidence of a satellite orbiting a brown dwarf companion obtained using this method. A few months earlier, another team had gathered clues suggesting the presence of a satellite during observations of the HD 206893 star system using the VLT Interferometer but had not yet achieved a definitive detection.<\/p>\n
The object discovered in this study occupies a unique position that cannot be fully understood using the conventional framework for moons in our solar system. \u201cWe have a clear delineation between the planets and the Sun in the Solar System, so defining things like moons is simple,\u201d says<\/a> Alice Zurlo, an astrophysicist at Diego Portales University, in a news release. \u201cIn the CD-35 2722 system, where we are blurring the lines between stars, planets, and moons, the whole thing becomes more complicated to describe.\u201d<\/p>\n It remains unclear whether this object should be called a moon. ESO also notes that there is no officially recognized definition for exomoons and the researchers use the term \u201cexosatellite.\u201d The paper itself acknowledges that it is uncertain whether this object will meet future criteria to be considered a moon, but that the discovery is a step toward creating a definitive detection.<\/p>\n Researchers believe this discovery will serve as a catalyst for identifying new directions in future theories of planet formation and celestial mechanics. Furthermore, if there are smaller, rocky moons like the one in the new paper, they could be subjected to tidal heating from brown dwarfs, potentially creating environments suitable for life even at greater distances from their stars\u2014a development that might also have implications for the search for extraterrestrial life.<\/p>\n It\u2019s also possible that once the next-generation Extremely Large Telescope equipped with a 39-meter primary mirror is completed, it will be possible to detect even smaller exomoons.<\/p>\n