More than a hundred light years from the earth, a young star surrounded by dust has long intrigued astronomers. Material rings, curiously empty areas, but no visible planet sign. Until an infrared light betrays the presence of an unknown star. For the first time, the James Webb space telescope has just drawn an exoplanet directly observed by humanity, nestled at the heart of a system in training.
The James Webb space telescope has changed the situation. Using a coronographer installed on his Miri instrument, capable of blocking the light of the central star, the researchers were able to spot an infrared source housed in one of these shortcomings. The data show that the object observed is a giant gasel planet of about 0.3 times the mass of Jupiter, which makes it the lightest ever image directly. The study led by astronomer Anne-Marie Lagrange, the CNRS and the Paris Observatory, published in the Revue Nature, confirms that it is neither an object of the solar system nor a background galaxy.
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What this exoplanet reveals on the formation of rings and young systems
The newly detected planet, called TWA 7B, evolves in a system still in full youth. The star around which it gravitates has only six million years, a minimal fraction of the age of the sun. This extreme youth makes the exoplanet itself still warm and shiny, which facilitates its observation in infrared. According to digital simulations, the planet is precisely found in an area of the disc identified as a under-dense region, between two rings rich in matters.
This positioning is not trivial. It corresponds to a diagram predicted by theoretical models, in which a so -called “shepherdess” planet sculpts a ring by accumulating or pushing the debris nearby. The presence of TWA 7B at this location reinforces this hypothesis and validates, for the first time, an ancient intuition of astrophysicists. As Space.com explains, similar rings had been observed in other systems, but never associated with a planet confirmed so far.
One more step towards understanding distant planetary systems
Beyond the object itself, this discovery marks a major turning point in the exploration of planetary systems. Unlike the majority of exoplanets identified in recent decades by the transit method, the researchers have managed to imagine TWA 7B directly, a prowess still very rare. Since the 1990s, astronomers have identified nearly 6,000 exoplanets, but they have only been able to observe less than 2%, according to Reuters.
Thanks to the unequaled sensitivity of its instruments, the James Webb telescope now opens an observation window on more distant, younger and less massive planets. This advance suggests the possibility of imagining a rocky worlds similar to the earth one day, even if this feat remains out of reach for the moment. As Anne-Marie Lagrange points out, the potential of the space telescope to explore even smaller and cold planets is just beginning to express themselves. TWA 7B, by its low mass and its strategic position, may well inaugurate a new era in understanding the complex interactions between planets and matter disks.
