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Astronomy: james webb discovers its:
Spatial discovery
The James Webb telescope discovers its first exoplanet – Astronomy: james webb discovers its
Astronomers spotted a small cold planet with a mass comparable to that of Saturn.
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In this image. Meanwhile, The location of the star is indicated by a circle and a star symbol in the center of the image. Similarly, The blue color represents the data from the SPPHERE INSTRUMENT OF VLT. Similarly, which shows the location of the disc surrounding the host star. Furthermore, Miri data is represented in orange. Consequently, The shiny orange stain at the top right of the star is the source identified as TWA 7 B. Furthermore, inside the debris disc.
Nasa, Esa, Ana, anne, Annene-Marie Lagrange (CNRRS, Uga), Mahdi Zamani (Esa / Web)
And one for the space telescope James Webb (JWST). In addition, which discovered its first exoplanet in the nearby universe, thanks to a promising observation method to detect planets of a size similar to those of the solar system.
Since 2022 and its observation post at 1.5 million km from the earth, the JWST has helped to characterize several exoplanets. Moreover, “He spent a lot of time observing planets that have never been colorful. ” the astrophysicist Anne-Marie Lagrange, the first author of the subject on the subject published in AFP in AFP in Nature Wednesday.
The exercise is complicated by the fact that the exoplanets “are very little bright because they are not hot”. but also and astronomy: james webb discovers its above all because “we are blinded by the light of the star around which they turn”, adds this researcher of the CNRS to the laboratory of instrumentation and research in astrophysics of the Paris Observatory.
The James Webb parade is based on its coronograph. an instrument that is inspired by the phenomenon of the solar eclipse by masking the star to better reveal what surrounds it, and on its spectrographer Miri, capable of imagining the most discreet stars thanks to an infrared vision.
Astronomy: james webb discovers its
Leader TWO 7
Its users pointed out the telescope to the TWA 7 star. located in our galaxy a hundred lights of the earth, in other words its very small suburbs. The target, initially detected by the Hubble telescope, was promising double -title.
First, because young of only 6.4 million years old and therefore very likely to see planetary bodies formed in the ceinturating matter disk. Then, because the telescope sees this protoplanetary disc from above.
His observation with the Sphere instrument of the very large telescope (VLT). located in Chile, had made it possible to distinguish three rings staring over a distance going up to more than a hundred times that separating the earth from the sun.
And it is in the stronghold of the second ring that the instrument of the James Webb detected a light “source”. called TWA 7B. Having excluded that the discovery turns out to be an object of the solar system. a distant galaxy, astronomers have identified it as a small cold planet, of a mass ten times lower than those pictured astronomy: james webb discovers its so far with other instruments.
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They consider its mass comparable to that of Saturn. a gas planet which “weighs” only a third of Jupiter, giant gaseous and heavy goods vehicle of our solar system.
James Webb performance
With the James Webb. “we fell from a factor of ten in detection capacity,” explains Anne-Marie Lagrange, because the most “light” planets colorful so far from the ground weighed about three times the mass of Jupiter.
“Most of the other colorful exoplanets are what are astronomy: james webb discovers its called super-jupiter”. having eight to twelve times the mass of the latter.
Performance has all the more interest since in the planetary bestiary. rocky planets like earth or Mars have much lower masses than gaseous planets. However, these rocky exoplanets constitute an ultimate target of the discoverers of potentially habitable worlds.
Anne-Marie Lagrange would not sulk her pleasure of “discovering the lightest planets and perhaps finding land”. Before adding immediately that if “we want to understand how planetary systems are formed. it is not enough to see the planets very or not massive”.
Because you must be able to detect all types of planets. in order to ultimately determine whether our solar system is unique or not.
Astronomers believe that the James Webb has the astronomy: james webb discovers its potential to detect. imagine planets with an even lower mass than TWA 7B. But it will take future instruments. such as the extremely wide (ELT) telescope expected for 2028, to hope to grasp the image of worlds of a size similar to ours.
AFP
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