Although the discovered planet is a hot and gaseous giant on which it is impossible for life to exist as we know it, this discovery shows the possibility of conducting observations of rocky planets with the ultimate aim of finding out whether any of them have favorable conditions for the emergence of life forms.
Natalie Battaglia, professor of astrophysics at the University of California, Santa Cruz, said on Twitter that the discovery was amazing, and wrote, “We really do have a chance to discover the atmospheres of planets the size of Earth.”
This planet was chosen because several criteria facilitate its observation, while scientists are still evaluating the capabilities of the telescope, which revealed its first images less than two months ago.
WASP-39 b passes very regularly in front of its sun (it goes around it in four days), and its atmosphere is stretched.
The James Webb Telescope was able to provide data on the planet by capturing the tiny contrast in brightness caused by its passage in front of its star.
The telescope then performed analyzes of “filtered” light through the planet’s atmosphere, as various molecules in the atmosphere leave specific signatures that enable their composition to be determined.
The Hubble and Spitzer telescopes had previously monitored the presence of water vapor, sodium and potassium in the atmosphere of this planet, but James Webb was able to go deeper thanks to his great infrared ability.
The NASA statement quoted Zafer Rustamkulov of Johns Hopkins University as saying that detecting the presence of carbon dioxide is tantamount to “crossing a threshold in exoplanet science.”