Astronomers have unveiled a fascinating new exoplanet located just 35 light-years from Earth, perpetually shrouded in a massive ocean of lava.
The exoplanet, designated L 98-59 d, has the potential to challenge current theories of planet formation and introduce an entirely new category of planetary bodies, according to recent study published in Nature Astronomy.
This groundbreaking discovery stems from observations made by the James Webb Space Telescope (JWST) alongside various ground-based observatories, which revealed several striking characteristics.
Notably, L 98-59 d, measuring 1.6 times the size of Earth, exhibits a remarkably low density and possesses substantial quantities of hydrogen sulfide in its atmosphere.
This positions L 98-59 d outside traditional classifications for similarly sized planets, which are typically categorized as either rocky “gas dwarfs” with hydrogen atmospheres or as “water worlds” characterized by oceans and ice. Clearly, L 98-59 d does not fit into these established categories.
To delve deeper into its true nature, a research team from the University of Oxford utilized computer simulations to rewind the clock approximately 5 billion years, reconstructing the planet’s entire evolutionary history.
Their simulations suggested that L 98-59 d is likely encased in a mantle of molten silicate rock, featuring a global magma ocean extending thousands of kilometers deep. This expansive reservoir enables the storage of significant amounts of sulfur, which accounts for the unusual atmospheric composition detected by JWST.
“This discovery implies that the classifications currently employed by astronomers to describe small planets may be overly simplistic,” stated the lead author, Dr. Harrison Nichols. “What other unique planets await discovery?”
The findings from this research also have implications for our own planet. “All planets initially form in a molten state. Some, like Earth, cool down, while others, like L 98-59 d, remain molten,” Nichols noted in BBC Science Focus.
“We can leverage these observations to gain insights into the early history of our own planet and the origins of life by studying the common physics that govern these ‘alien’ worlds.”
Looking forward, Nichols believes L 98-59 d could represent the first of many. “This planet may well be the inaugural member of the broader category of magma ocean worlds… ‘magma oceans’ could prove to be quite prevalent.”
Future missions, including the European Space Agency’s Ariel and PLATO missions, will provide further data to determine whether L 98-59 d is an anomaly or the first known representative of a much larger class of worlds.
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Source: www.sciencefocus.com
