An early – and exciting – science result from the James Webb Space Telescope (JWST) was announced today: the first unambiguous detection of carbon dioxide in the atmosphere of an exoplanet.
A series of light curves from Webb's Near-Infrared Spectrograph shows the change in brightness of three different wavelengths of light from the WASP-39 star system over time as the planet transited the star on 10 July 2022. , Joseph Olmsted Carbon dioxide is naturally present in Earth's atmosphere as part of the carbon cycle, but is also being emitted at increasing levels by human activities.
"The shape of the spectrum is unmistakable to someone like me who models exoplanet atmospheres for a living," she"This is very different from all previous exoplanet atmosphere observations where we would typically go through a much more involved process of comparing many different possible atmosphere models to the data to convince ourselves that we've detected a specific atom or molecule.
Because different gases absorb different combinations of colors, researchers can analyze small differences in the brightness of the transmitted light across a spectrum of wavelengths and determine exactly what an atmosphere is made of.Mercury The JWST team said that understanding the composition of a planet's atmosphere is important because it tells us something about the origin of the planet and how it evolved.
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