Chariklo's Rings Show Density Changes Over a Decade
The James Webb Space Telescope has observed changes in the rings around the minor planet Chariklo. One ring has become denser, while another has nearly vanished.
Astronomers have documented significant changes in the rings surrounding the minor planet Chariklo over the past decade. Observations using the James Webb Space Telescope reveal that one of Chariklo's two known rings has become considerably denser, while the other has almost entirely disappeared.
Chariklo, a body approximately 250 kilometers in diameter orbiting between Saturn and Uranus, was first found to possess rings in 2013. The discovery during a stellar occultation revealed two narrow rings, challenging the long-held belief that rings were exclusive to giant planets. "It was a surprise," noted Pablo Santos-Sanz, an astronomer involved in the initial discovery.
Researchers, including Santos-Sanz, predicted another stellar occultation event involving Chariklo and utilized the James Webb Space Telescope to gather new data. The technique involves observing how the starlight dims as the object passes in front of it, which reveals details about the object and its surroundings. The recent observations indicate a thickening of one ring and a near-complete dissipation of the other.
The reasons behind these dynamic changes remain unclear. Scientists are working to understand the composition of the ring material and the factors influencing their longevity. Studying such phenomena in distant, small bodies is technically challenging but offers crucial insights into the formation and evolution of planetary systems.