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James Webb House Telescope detects quartz crystals in an exoplanet’s environment

October 17, 2023
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James Webb House Telescope detects quartz crystals in an exoplanet’s environment
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Thousand-mile-per-hour winds are blowing a hail of tiny quartz crystals by the silicate-enhanced, scorching scorching environment of a distant fuel large planet referred to as WASP-17b, the James Webb House Telescope (JWST) has discovered.

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“We knew from Hubble [Space Telescope] observations that there should be aerosols — tiny particles making up clouds or haze — in WASP-17b’s environment, however we didn’t anticipate them to be product of quartz,” Daniel Grant of the College of Bristol within the UK and chief of a brand new research on the invention, stated in a statement.

WASP-17b is an unimaginable world. Orbiting each 3.7 days at a distance of simply 7.8 million kilometers (4.9 million miles) from its star, which sits 1,300 mild years away from Earth, WASP-17b is so near its stellar host that its dayside temperature rises to a staggering 1,500 levels Celsius (roughly 2,700 levels Fahrenheit). As a result of the environment is so scorching on this exoplanet, the world has truly expanded to about 285,000 kilometers (176,892 miles) throughout, which is simply shy of twice the diameter of Jupiter. And that is regardless of WASP-17b having solely about half of Jupiter’s general mass. WASP-17b is among the “puffiest” planets identified — and its bloated environment makes it an ideal goal for the James Webb House Telescope.

Associated: James Webb House Telescope spotlights attractive younger stars in a galaxy subsequent door (photograph)

Grant and fellow astronomers watched WASP-17b transit its star utilizing the JWST’s Mid-Infrared Instrument (MIRI). Because the exoplanet moved in entrance of its star from the JWST’s  viewpoint, MIRI detected starlight that was blocked by the puffy planet itself however partially absorbed by the world’s environment. Such measurements end in a so-called transmission spectrum, whereby sure wavelengths are blocked out by explicit atmospheric molecules.

Like Jupiter, WASP-17b gave the impression to be principally created from hydrogen and helium. As well as, MIRI detected carbon dioxide, water vapor and, at a wavelength of 8.6 microns, the absorption signature of pure quartz crystals. Mixed with earlier observations with the Hubble House Telescope, these crystals are judged to be formed like the identical pointy, hexagonal prisms as quartz is on Earth, however only a meager 10 nanometers in dimension. 

A diagram showing the light absorption pattern of WASP-17b. The section where quartz crystals are indicated is highlighted with a teal blue bar.

The transmission spectrum of WASP-17b, showing how the quartz is blocking light at a wavelength of 8.6 microns.  (Image credit: NASA/ESA/CSA/Ralf Crawford (STScI))

Quartz is a type of silicate, that are minerals wealthy in silica and oxygen. Silicates are exceptionally widespread — all of the rocky our bodies within the photo voltaic system are created from them, and silicates have beforehand been detected within the atmospheres of scorching Jupiter exoplanets earlier than. Nonetheless, in these instances they’d been extra complicated, magnesium-rich crystals of olivine and pyroxene.

“We absolutely anticipated to see magnesium silicates,” stated Bristol’s Hannah Wakeford. “However what we’re seeing as a substitute are possible the constructing blocks of these, the tiny seed particles have to kind the bigger silicate grains we detect in cooler exoplanets and brown dwarfs.”

WASP-27b can also be tidally locked, that means it at all times exhibits the identical face to its star. As winds whip across the planet, carrying alongside the quartz nanoparticles, they kind high-altitude hazes — basically diffuse clouds of rock crystals — on the day–evening termination zone. These hazes then enterprise into the dayside, and are vaporized within the warmth.

Grant defined how crystals of silicate come to be embedded in a planetary environment within the first place.

“WASP-17b is extraordinarily scorching … and the stress the place the quartz crystals kind excessive within the environment is simply about one-thousandth of what we expertise on Earth’s floor,” he stated. “In these circumstances, stable crystals can kind instantly from fuel, with out going by a liquid part first.”

The findings had been revealed in October in Astrophysical Journal Letters.



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