Discovering the Atmosphere of WASP-166 b

Astronomers have made significant strides in understanding the atmosphere of WASP-166 b, a hot super-Neptune exoplanet located about 368 light-years from Earth. Utilizing data from the James Webb Space Telescope (JWST), researchers have identified key components of the planet’s atmosphere, including water, carbon dioxide, and traces of ammonia. This discovery sheds light on the characteristics of WASP-166 b, which is notably larger and heavier than Earth. The findings also contribute to our understanding of planetary formation and evolution, particularly in the context of the so-called “hot Neptune desert.”

Findings from JWST Observations

The observations of WASP-166 b were conducted using the JWST’s advanced instruments, specifically the Near Infrared Imager and Slitless Spectrograph (NIRISS) and the Near Infrared Camera (NIRCam). These tools allowed astronomers to analyze the planet’s atmospheric composition in detail. The results revealed that water and carbon dioxide are the dominant elements present in the atmosphere. Additionally, researchers detected weak traces of ammonia, indicating a complex chemical environment.

The JWST’s observations also suggested that helium and hydrogen make up the remaining atmosphere, existing in a primordial solar ratio. This finding is crucial as it helps scientists understand the basic building blocks of the planet’s atmosphere. Interestingly, searches for other compounds, such as carbon monoxide, did not yield significant results. This lack of detection raises questions about the atmospheric processes at play on WASP-166 b and how they differ from those on other exoplanets.

Characteristics of WASP-166 and Its Planet

WASP-166, the star hosting this intriguing exoplanet, belongs to the F9V spectral type. It is approximately 20 percent larger and more massive than our Sun. At 2.1 billion years old, WASP-166 has a surface temperature of 6,050 K and a metallicity of 0.19 dex. These characteristics provide a backdrop for understanding the environment in which WASP-166 b exists.

The planetary carbon-to-oxygen ratio of WASP-166 b is particularly noteworthy. Calculated at 0.282, this ratio is significantly lower than that of its host star, which stands at 0.41, and the Sun, which has a ratio of 0.55. Furthermore, the planet’s high atmospheric metallicity of 1.57 suggests a rich chemical environment. These findings are essential for astronomers as they explore the diversity of exoplanetary systems and the unique traits that define them.

Explanations for Atmospheric Composition

The atmospheric composition of WASP-166 b raises intriguing questions about its formation and evolution. Researchers have proposed several theories to explain the observed characteristics. One possibility is that the composition is linked to planetesimal accretion, where solid materials from the surrounding environment contribute to the planet’s atmosphere. Another theory suggests that core erosion could play a role, where the planet’s core loses material over time, affecting the atmospheric makeup.

Additionally, photoevaporation may also influence the atmospheric composition. This process involves the loss of atmospheric gases due to intense radiation from the host star. Understanding these mechanisms is crucial for scientists as they seek to unravel the complexities of planetary atmospheres, especially in regions like the hot Neptune desert. The study of WASP-166 b not only enhances our knowledge of this specific exoplanet but also contributes to the broader understanding of how diverse planetary systems can be.


Observer Voice is the one stop site for National, International news, Editorโ€™s Choice, Art/culture contents, Quotes and much more. We also cover historical contents. Historical contents includes World History, Indian History, and what happened today. The website also covers Entertainment across the India and World.

Follow Us on Twitter, Instagram, Facebook, & LinkedIn

Leave a Reply

Your email address will not be published. Required fields are marked *

Back to top button