English: Discovery Alert: Webb has captured the first clear evidence of carbon dioxide (CO2) in the atmosphere of a planet outside of our solar system! 📢

Read more: www.nasa.gov/feature/goddard/2022/nasa-s-webb-detects-car...

About this image:

A series of light curves from Webb’s Near-Infrared Spectrograph (NIRSpec) shows the change in brightness of three different wavelengths (colors) of light from the WASP-39 star system over time as the planet transited the star on July 10, 2022. A transit occurs when an orbiting planet moves between the star and the telescope, blocking some of the light from the star.

This observation was made using the NIRSpec PRISM bright object time-series mode, which involves using a prism to spread out light from a single bright object (like the star WASP-39) and measure the brightness of each wavelength at set intervals of time.

To capture these data, Webb stared at the WASP-39 star system for more than eight hours, beginning about three hours before the transit and ending about two hours after the transit was complete. The transit itself lasted about three hours. Each curve shown here includes a total of 500 individual brightness measurements – about one per minute.

Although all colors are blocked to some extent by the planet, some colors are blocked more than others. This occurs because each gas in the atmosphere absorbs different amounts of specific wavelengths. As a result, each color has a slightly different light curve. During the transit of WASP-39 b, light with a wavelength of 4.3 microns is not as bright as 3.0-micron or 4.7-micron light because it is absorbed by carbon dioxide.

WASP-39 b is a hot gas giant exoplanet that orbits a Sun-like star roughly 700 light-years away, in the constellation Virgo. The planet orbits extremely close to its star (less than 1/20th the distance between Earth and the Sun) and completes one orbit in just over 4 Earth-days. The star, WASP-39, is roughly the same size, mass, temperature, and color as the Sun. The planet’s discovery, from ground-based observations, was announced in 2011.

The background illustration of WASP-39 b and its star is based on current understanding of the planet from Webb spectroscopy and previous ground- and space-based observations. Webb has not captured a direct image of the planet or its atmosphere.

Credit: Illustration: NASA, ESA, CSA, and L. Hustak (STScI) Science: The JWST Transiting Exoplanet Community Early Release Science Team

Image description:

Graphic titled “Hot Gas Giant Exoplanet WASP-39 b Transit Light Curve, NIRSpec Bright Object Time-Series Spectroscopy.” Two graphs show relative brightness of starlight on the vertical y axis versus time in Baltimore, Maryland on July 10, 2022 on the horizontal x axis. Both show data for 3 wavelengths of light. Blue circles: 3.0-micron light; green squares: 4.3-micron; red diamonds: 4.7-micron. Top graph shows measurements before, during, and after the transit: Data form a U-shaped valley of low brightness labeled “Starlight blocked by the planet and its atmosphere” cut into a flat plain of high brightness labeled “Starlight.” Below is a zoom-in of the transit (the bottom of the valley) showing that the 4.7-micron light is brightest, the 4.3-micron light is dimmest, and 3.0-micron light is in between. A red 4.7-micron data points is labeled “Planet’s atmosphere blocks less of this color.” A green 4.3-micron data point is labeled, “Planet’s atmosphere blocks more of this color because of absorption by C O 2.”