The discovery
This discovery of the Neptune-sized planet TOI-3261 b is quite a breakthrough. Its Scorching close orbit around its star makes it only the fourth known planet of its kind. Studying it could provide valuable insights into the formation of similar planets.
Key Facts
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Size and Composition: TOI-3261 b is similar in size and composition to Neptune.
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Orbit: It orbits extremely close to its host star, with a year on TOI-3261 b lasting only 21 hours.
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Hot Neptune Desert: It belongs to a rare category of planets known as the “hot Neptune desert,” with only four known members.
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Density: The planet is about twice as dense as Neptune, indicating that lighter atmospheric gases have been stripped away over time.
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Age: The star and planet system is estimated to be about 6.5 billion years old.
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Formation: It likely started out as a much larger gas giant and lost mass through photoevaporation and tidal stripping.
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Atmosphere: The remaining atmosphere is a subject of interest for further study, potentially using NASA’s James Webb Space Telescope.
Details
Planet TOI-3261 b presents a fascinating case for testing new computer models of planet formation. Here are some key points:
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Rare Hot Neptunes: It’s challenging for planets so close to their stars to maintain a thick gaseous atmosphere due to the star’s gravitational pull and the energy it emits. This makes hot Neptunes like TOI-3261 b quite rare.
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Possible Origins: It’s hypothesized that TOI-3261 b might have initially been a much larger Jupiter-sized planet and lost a significant amount of mass over time.
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Age and Evolution: Modeling suggests that the star and planet system is about 6.5 billion years old. The planet likely lost mass through photoevaporation (energy from the star causing gas particles to dissipate) and tidal stripping (the star’s gravitational force removing layers of gas).
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Formation Distance: It’s possible that TOI-3261 b formed farther from its star, where these effects were less intense, enabling it to retain its atmosphere initially.
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Atmosphere: The planet’s current atmosphere, which is twice as dense as Neptune’s, indicates that the lighter parts have been stripped away, leaving heavier components. Observing it in infrared light with tools like NASA’s James Webb Space Telescope could reveal more about its composition and formation history.
This planet’s unique characteristics could offer valuable insights into the processes behind the formation and evolution of all hot, giant planets
Fun Facts
The discovery of LTT-9779 b in 2020 marked the first known ultra-short-period hot Neptune. Following this, TESS has identified two more similar planets, TOI-849 b and TOI-332 b, both of which have had their masses precisely measured. These discoveries are significant as they help build a better understanding of this rare class of exoplanets.
Both LTT-9779 b and TOI-849 b are set for detailed infrared observations with the James Webb Space Telescope (JWST). These observations will be crucial in studying their atmospheres, offering insights into their composition and the processes that shape such unique planets
The Discoverers
Yes, that’s correct! Emma Nabbie and her international team from the University of Southern Queensland published their findings in The Astronomical Journal in August 2024. Their paper, titled “Surviving in the Hot Neptune Desert: The Discovery of the Ultrahot Neptune TOI-3261 b,” details the discovery and significance of TOI-3261.