Home / Science / A distant blue star is home to one of the most extreme exoplanets known to science

A distant blue star is home to one of the most extreme exoplanets known to science



Artistic impression of the exoplanet WASP-1<div class="e3lan e3lan-in-post1"><script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
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</script></div>89b orbiting its blue host star.

Artistic impression of the exoplanet WASP-189b orbiting its blue host star.
image:: ESA

The newly deployed CHEOPS space telescope has made its first observations of one Exoplanet discovering some fascinating new details about an ultra-hot Jupiter known as WASP-189b.

Hot Jupiter are Jupiter-like exoplanets that are in close proximity to their host stars, hence their name. Ultra hot Jupiters are basically the same, but as you have probably suspected they are even hotter. Astronomers were already using the ground-based WASP-S in 2018Outh telescope in South Africa recognized an ultra-hot Jupiter named WASP-189b, uunlike anything seen before.

Two years later with the brand– –CaningWith the new CHEOPS (Characterizing Exoplanet Satellite) space telescope, astronomers have looked at this celestial wonder with new eyes and refined what we know about this unusual exoplanet, while also reaffirming the enormous potential of this European space telescope, which was only beginning to become scientific in the past observations April.

In fact, compared to ground-based telescopes, CHEOPS is “simply much more precise,” explained Monika Lendl, astronomer at the University of Geneva and lead author of the new study, in an email. “Since CHEOPS observes from space, it doesn’t have to look through the earth’s atmosphere. and so the light is not disturbed by air turbulence. “

CHEOPS, a collaboration between the European Space Agency and the Swiss Space Agency, is used exclusively for the detection and observation of exoplanets. It detects dips in the brightness of a star – a potential sign that an exoplanet is passing in front of it (i.e., the transit method of detection). CHEOPS will also study previously discovered exoplanets, as is the case here with WASP-189b.

“Cheops plays a unique role in studying such exoplanets,” said Kate Isaak, CHEOPS project scientist at ESA and co-author of the new study, in a press release. “It will look for transits of planets discovered from the ground and, where possible, more accurately measure the size of planets that are already known to pass through their host stars.”

A new paper Astronomy & Astrophysics published a description of the first formal study of the space telescope.

WASP-189b is located 322 light-Years away in the Libra constellation of the southern hemisphere. This ultra-hot Jupiter is in a tight orbit around the A-type star HD 133112, the lights up blue. The exoplanet, just 7.5 million km from its host star, takes just 2.7 days to reach full orbit. Given this cozy arrangement – at about 5% of the distance from Earth to Sun – WASP-189b is very hot, and the new CHEOPS data refines previous estimates.

Illustration for article titled A distant blue star hosts one of the most extreme exoplanets known to science

image:: ESA

The temperature of WASP-189b is actually hard to find out because this is gas giant pretty bright, resulting in conflicting data between itself and its host star. To get around this, Lendl and her colleagues waited for eclipses where, from our point of view, planets pass behind their host stars (similar to the opposite of the transit method). This enabled the scientists to correctly see the brightness of the exoplanet, which in turn enabled them to measure its temperature.

“WASP-189b is one of the hottest known gas giants,” said Lendl. “With CHEOPS we were able to determine the brightness of the planetary day and determine that the light it emits corresponds to a planet with a temperature of around 3,200 degrees Celsius [5,800 degrees Fahrenheit]. ”

That is intense; Our sun is only 2,000 degrees hotter than this scorching exoplanet. In fact, WASP-189b is hotter than some red dwarf stars that cook at temperatures well below 3,000 ° C (5,430 ° F). The chances of a life on this planet are basically zero as even iron is converted to gas at these extremes.

It is known that few planets are that hot. WASP-189b is also the brightest hot Jupiter known to scientists.

Researchers refined the mass of the exoplanet and found it to be almost exactly two times heavier than Jupiter. They also updated the diameter of the WASP-189band found that it is 1.6 Jupiter’s latitudeor 139000 miles (224)000 km), which is slightly larger than in previous calculations.

The scientists also noticed that the star, HD 133112, is not perfectly round – it is actually kind of squashed and arched at the equator, where it is noticeably cooler compared to the polar regions. The star is fast crazying and resulting centrifugal tidal forces contribute to it strange shape, note the authors in the study.

Interestingly, WASP-189b is in an inclined orbit, meaning it does not coincide with the star’s equatorial plane. Actually it is Really misaligned, zooming over the polar regions of the star. This is an important observation as it means the exoplanet has likely formed fafurther out and then slowly migrated inward over time. This hike to the host star took place either due to the gravitational influence of other planets in the same system or The researchers speculate the influence of another star.

With the observations of WASP-189b completed, CHEOPS will now turn its attention to hundreds of other known exoplanets and their host stars in order to further constrain their mass, size and orbits. As this first investigation makes clear, we can expect much more from this exciting new space telescope.


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