Science, Space and Technology News 2024
Astronomers have discovered an enormous, low-density planet named WASP-193b, which is 50% larger than Jupiter but has a cotton candy-like density. This finding challenges existing planet formation theories. Credit: SciTechDaily.com
The new planet, named WASP-193b, appears to dwarf Jupiter in size, yet it is a fraction of its density. The scientists found that the gas giant is 50 percent bigger than Jupiter, and about a tenth as dense — an extremely low density, comparable to that of cotton candy.-like world, Kepler 51d. The new planet’s much larger size, combined with its super-light density, make WASP-193b something of an oddity among the more than 5,400 planets discovered to date.
The study’s MIT co-authors include Julien de Wit, an assistant professor in MIT’s Department of Earth, Atmospheric and Planetary Sciences, and MIT postdoc Artem Burdanov, along with collaborators from multiple institutions across Europe.The new planet was initially spotted by the Wide Angle Search for Planets, or WASP — an international collaboration of academic institutions that together operate two robotic observatories, one in the northern hemisphere and the other in the south.
For WASP-193 b, astronomers obtained additional high-resolution spectra of the star taken by various ground-based telescopes, and attempted to employ radial velocity to calculate the planet’s mass. But they kept coming up empty — precisely because, as it turned out, the planet was far too light to have any detectable pull on its star.
“We were initially getting extremely low densities, which were very difficult to believe in the beginning,” Pozuelos adds. “We repeated the process of all the data analysis several times to make sure this was the real density of the planet because this was super rare.”In the end, the team confirmed that the planet was indeed extremely light. Its mass, they calculated, was about 0.14 that of Jupiter. And its density, derived from its mass, came out to about 0.059 grams per cubic centimeter.
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