James Webb Telescope detects magma ocean on exoplanet L 98-59 d, 35 light years from Earth

The international astronomical community recorded an unprecedented discovery involving the structural composition of worlds outside our Sistema Solar. Dados recent images captured by high-precision instruments revealed that the exoplanet designated as L 98-59 d harbors a vast global ocean of magma in its interior. The celestial body is located at a distance of 35 light years from Terra.

The observations were conducted using Telescópio Espacial James Webb, which used its advanced spectrographs to analyze the light filtered by the planet’s atmosphere. The equipment’s infrared observation capabilities allowed scientists to map chemical features that had previously remained hidden. The results indicate extremely active geological dynamics.

The exoplanet orbits a red dwarf star and is approximately 1.6 times larger than our planet. Essa proportion places it in a transitional category, requiring new approaches to understand its formation. The identification of the melted material changes conventional models about the evolution of rocky bodies in the universe.

Density anomaly redefines planetary models

Physical measurements of L 98-59 d indicated a density significantly lower than what would be expected for a planet with a strictly rocky and metallic composition. Enquanto to Terra has an average density of around 5.5 grams per cubic centimeter, the exoplanet in question records values ​​close to 2.2 grams per cubic centimeter. Essa fundamental discrepancy puzzled researchers during primary data analysis.

Initially, the low density led astrophysics teams to consider the hypothesis that the celestial body could be an oceanic world, covered in water, or a miniature gas dwarf. However, rigorous computer simulations cross-referenced with traffic spectra ruled out these possibilities. The absence of dominant water signatures forced the search for an alternative explanation.

The solution found by scientists points to an internal structure rich in molten material, capable of acting as an immense reservoir of volatile elements. The model that best fit the telescope data suggests that the planet’s interior retains large amounts of sulfur and hydrogen. Esses elements, dissolved in magma, reduce the global density of the celestial body.

This structural configuration demonstrates that more than 1.8% of the planet’s initial mass may be stored in the form of trapped volatile gases. The discovery establishes a new class of superheated exoplanets, which differ substantially from the dry super-Earths and gas-rich mini-Neptunes already cataloged by modern astronomy.

Molten silicate mantle dynamics

The interior of L 98-59 d is dominated by a mantle composed of molten silicate, a material that resembles the lava expelled during terrestrial volcanic eruptions, but on a planetary scale. Esse magma ocean is not superficial, extending thousands of kilometers towards the planet’s core. The depth of this liquid layer is a determining factor for the global chemistry of the celestial body.

Thermodynamic models applied to the study confirm that the melting fraction in the mantle reaches the 45% mark. Isso means that almost half of the silicate material remains in a liquid state even after billions of years of planetary evolution. Maintaining this extreme physical state allows sulfur to be continually dissolved in the geological interior.

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Photochemical processes in the upper atmosphere

The exoplanet’s atmosphere acts in synchrony with its molten interior, presenting a composition rich in hydrogen and hydrogen sulfide. The spectra captured by James Webb detected the predominance of these compounds, which are continuously released by the magma ocean through a degassing process. Essa dynamics differ drastically from planets that lose their atmosphere quickly to the vacuum of space.

The ultraviolet radiation emitted by the host star plays a crucial role in the atmospheric chemistry of L 98-59 d. Quando starlight reaches the upper layers of the planet, it triggers intense photochemical reactions that transform part of the hydrogen sulfide into sulfur dioxide. Esse chemical conversion mechanism occurs in a highly reducing environment and at scorching temperatures.

Scientists compare this phenomenon to the formation of the ozone layer in Terra, although the elements involved and the extreme conditions are completely different. The constant interaction between stellar radiation and volcanic gases creates a continuous cycle of atmospheric renewal. The internal magma reservoir ensures that the thickness of the atmosphere is maintained throughout geological eras.

Gravitational heating and the star system

The exoplanet L 98-59 d is part of a complex multiplanetary system, orbiting a red dwarf star that has a lower mass and temperature than Sol. The extreme proximity between the planet and its host star results in an intense gravitational interaction, generating a phenomenon known as tidal heating or tidal heating. Essa continuous gravitational force deforms the interior of the planet, generating internal friction and, consequently, a massive amount of heat that prevents the silicate mantle from solidifying.

The configuration of this stellar system offers a privileged natural laboratory for astrophysics, as it allows the observation of multiple celestial bodies subjected to the same radiation environment, but with varying distances and compositions. L 98-59 d is the outermost confirmed planet in this particular system, and its ability to retain a permanent magma ocean under intense irradiation provides crucial data on the resilience of hydrogen-rich atmospheres. Orbital dynamics ensure that internal heat is constantly replenished, sustaining geological activity.

Evolutionary transition in the planetary radius ditch

The identification of this superheated world provides fundamental answers to one of the biggest mysteries in current exoplanetology: the so-called “ray trench.” The theoretical Esta region represents an observational gap in astronomical catalogues, where there is a notable scarcity of planets with sizes between 1.5 and 2 times the radius of L 98-59 d, with its radius 1.627 times that of Earth, is located exactly in this critical transition zone. The team of researchers demonstrated that the molten interior represents an alternative and previously undocumented evolutionary path. Instead of losing all its volatiles and shrinking to become a dry super-Earth, or retaining a massive envelope of light gas like a mini-Neptune, this planet has found a thermal and chemical balance. The process involves the prolonged retention of hydrogen and carbon in the incipient atmosphere, while sulfur remains mostly trapped in deep magma, dictating an extremely slow secular cooling rate and shaping a new category of celestial bodies.

Technological advances in space exploration

The successful characterization of L 98-59 d reaffirms the technical ability of Telescópio Espacial James Webb to probe chemical properties of distant worlds with unprecedented precision. The integration of spectroscopic transit data obtained in space with complementary observations from ground-based telescopes made it possible to refine the planet’s physical parameters. Futuras observation campaigns will focus on mapping thermal variations in the atmosphere to confirm the exact extent of the molten reservoir.

Impact on exoplanet catalogs

Confirmation that a global magma ocean can act as a long-term chemical regulator changes search criteria in conventional astronomical surveys. Planetas that previously presented unexplained density anomalies can now be reevaluated from the perspective of this new structural model. Geological diversity outside of Sistema Solar proves to be more complex than initial theories predicted.

Consolidated data indicates that worlds with scalding hot surfaces and liquid interiors may be statistically more common on Via Láctea than previously estimated. Understanding how sulfur and hydrogen interact under conditions of extreme pressure and temperature will continue to guide spectroscopic analyzes in future cycles of space research.