James Webb Telescope reveals exoplanet atmosphere as never seen before
New observations of WASP-39 b reveal a never-before-seen molecule in the atmosphere of a planet sulfur dioxide among other details.
The telescope's array of highly sensitive instruments was trained on the atmosphere of a "hot Saturn" -- a planet about as massive as Saturn orbiting a star some 700 light-years away -- known as WASP-39 b. While JWST and other space telescopes, including Hubble and Spitzer, previously have revealed isolated ingredients of this broiling planet's atmosphere, the new readings provide a full menu of atoms, molecules, and even signs of active chemistry and clouds.
"The clarity of the signals from a number of different molecules in the data is remarkable," says Mercedes Lopez-Morales, an astronomer at the Center for Astrophysics | Harvard & Smithsonian and one of the scientists who contributed to the new results.
"We had predicted that we were going to see many of those signals, but still, when I first saw the data, I was in awe," Lopez-Morales adds.
The latest data also give a hint of how these clouds in exoplanets might look up close: broken up rather than a single, uniform blanket over the planet.
The findings bode well for the capability of JWST to conduct the broad range of investigations on exoplanets -- planets around other stars -- scientists hoped for. That includes probing the atmospheres of smaller, rocky planets like those in the TRAPPIST-1 system.
"We observed the exoplanet with multiple instruments that, together, provide a broad swath of the infrared spectrum and a panoply of chemical fingerprints inaccessible until JWST," said Natalie Batalha, an astronomer at the University of California, Santa Cruz, who contributed to and helped coordinate the new research. "Data like these are a game
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