Astronomers have uncovered a fascinating new exoplanet, TOI-5734 b, located roughly 106 light-years away from Earth. The planet, discovered through data from the Transiting Exoplanet Survey Satellite (TESS) and the HARPS-N spectrograph, provides new insights into the diverse array of exoplanets in our galaxy. This discovery, described in a February 2026 study on arXiv, adds to our growing understanding of planets that fall into the sub-Neptune category. TOI-5734 b, with its unique characteristics, holds crucial clues about planetary evolution and atmospheric conditions on distant worlds.
A New Discovery in Exoplanet Research: TOI-5734 B
The discovery of TOI-5734 b marks an exciting breakthrough in the study of exoplanets, particularly those classified as sub-Neptunes. Using observations from TESS and the HARPS-N spectrograph, an international team of astronomers has unveiled this hot, rocky planet orbiting a young star. The exoplanet, located about 106 light-years from Earth in the constellation Lyra, is a prime example of how new technologies are enabling deeper exploration of distant worlds. The study, available on arXiv, explains that TOI-5734 b has a radius roughly twice that of Earth, making it a giant compared to our home planet.
The planet orbits its star, TOI-5734, a relatively young K3-K4 dwarf star, every 6.18 days. With a mass nine times that of Earth and a radius of 2.1 Earth radii, TOI-5734 b is in the hot sub-Neptune category, which is known for having a gas-rich atmosphere and significant size. The team behind the discovery, led by Simone Filomeno of the Astronomical Observatory of Rome, Italy, used a combination of data from three TESS sectors and spectroscopic information from the HARPS-N spectrograph installed at the Galileo National Telescope. The astronomers noted that,
“In this paper, we present the detection and characterization of the transiting young planetary system TOI-5734 (TIC 9989136).”
The Star Behind the Discovery: TOI-5734
TOI-5734, the host star of TOI-5734 b, is a relatively cool and young dwarf star. With a mass of about 0.72 solar masses and a radius of 0.64 solar radii, TOI-5734 is significantly smaller than the Sun. Despite its smaller size, the star is rich in important data for astronomers trying to understand the conditions under which planets like TOI-5734 b form and evolve. The effective temperature of TOI-5734 is around 4,750 K, which is typical for stars of its type. This star is relatively young in cosmic terms, with an age estimated to be only a few billion years.
In the study, the astronomers explained that the detection of TOI-5734 b came from TESS observations in 2022, where a transit signal was detected in the light curve of this star. “The study was performed using a combination of three TESS sectors and spectroscopic data from HARPS-N spectrograph installed at the TNG [Galileo National Telescope],” they stated. This combination of data sources enabled the researchers to confirm the existence of the planet and begin their characterization.
Understanding TOI-5734 B: Its Size and Mass
TOI-5734 b stands out due to its size and mass, making it an intriguing object for further study. The exoplanet has a radius of about 2.1 Earth radii and a mass of 9.1 Earth masses, placing it in the category of super-Earths or sub-Neptunes. Its density is slightly lower than that of Earth, suggesting it may not be composed entirely of rock and metal. The planet orbits very close to its host star, with an orbital period of just 6.18 days, and is situated at a distance of approximately 0.06 AU from its star. This proximity contributes to its extremely hot temperatures, with an estimated equilibrium temperature of around 688 K.
This size and mass, combined with the close proximity to its star, make TOI-5734 b an excellent candidate for studying the properties of planets in extreme conditions. The planet’s position in the “radius valley”, a gap in the planet size distribution between 1.5 and 2.0 Earth radii, further enhances its scientific value. As the study notes, TOI-5734 b’s size places it right on the upper edge of this radius valley, which has long been a subject of interest for astronomers studying the formation and evolution of exoplanets.
Chemical Composition and Future Evolution of TOI-5734 B
One of the most intriguing aspects of TOI-5734 b is its potential chemical composition. The study suggests that the planet is likely rocky, but with significant atmospheric stripping. The researchers hypothesize that TOI-5734 b has almost lost its original atmosphere, though there remains a possibility that it could be a water-world. The planet’s high temperature and close orbit to its star have likely led to the stripping of lighter elements from its atmosphere over time. The astronomers propose that TOI-5734 b will likely lose its primordial atmosphere completely within 300 million years.
The study’s authors further explain the planet’s evolution, noting that TOI-5734 b may have originally formed farther from its host star and gradually migrated inward. This migration process is typical for many exoplanets, particularly those that are located near their star’s habitable zone. The current position of TOI-5734 b, near the radius gap, suggests that it has undergone significant changes over its lifetime.
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