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NASA’s TESS spacecraft has discovered two unusually puffy planets in the same star system. These planets are as large as Jupiter but have very low mass, making them some of the lightest known gas giants. The discovery offers new insights into planetary formation and system dynamics.
NASA’s Transiting Exoplanet Survey Satellite (TESS) has identified two planets in the same star system that are as large as Jupiter but have densities comparable to cotton candy, making them the ‘puffiest’ worlds ever found. This discovery was made through analysis of over seven years of data, and it highlights the rarity of such planets in our galaxy.
The two planets, designated TOI-791 b and TOI-791 c, are notable for their enormous sizes and extremely low masses. TOI-791 b is nearly the same size as Jupiter but has only about three percent of Jupiter’s mass, while TOI-791 c exceeds Jupiter’s size but has just 5.9 percent of its mass. These planets were identified by a team led by George Dansfield of Oxford University, who analyzed TESS data collected over 1,122 days.
Scientists confirmed their existence by observing their long orbital periods and the gravitational interactions between them, which affected the timing of their transits around the host star. These interactions allowed researchers to estimate their masses despite their low densities. The planets are also in a unique orbital configuration, tugging on each other in a way that influences their transit timing variations.
Further research aims to understand their atmospheric composition, rotational dynamics, and formation processes, which remain largely unknown. NASA scientists emphasize that studying these planets could shed light on the evolution of planetary systems and the mechanisms behind the formation of such ‘cotton candy’-like worlds.
Why These ‘Cotton Candy’ Planets Are a Rare Find
The discovery of these two extremely low-density, gas giant-sized planets in the same system is significant because such ‘super puffy’ planets are very rare. Their unique characteristics challenge existing models of planetary formation, which typically predict denser compositions for planets of similar size.
Understanding these planets could provide new insights into how planetary systems evolve, especially in terms of atmospheric retention and mass loss. The fact that they are in a long, stable orbit and influence each other’s transit timing makes them valuable for studying gravitational interactions in planetary systems.
Ultimately, these findings expand our knowledge of the diversity of exoplanets and could influence future search strategies for habitable worlds or other exotic planetary types.
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Background on TESS and Prior Exoplanet Discoveries
Launched in 2018, NASA’s TESS mission aims to identify exoplanets around nearby stars, covering an area 400 times larger than the Kepler mission. Since then, TESS has cataloged over 7,900 exoplanet candidates, with nearly 900 confirmed so far.
Among its discoveries, TESS has identified a variety of exoplanets, including some with unusual properties. The detection of these ‘super puffy’ planets adds to the growing understanding of the diversity of planetary systems. The specific system containing TOI-791 b and c was observed over a span of seven years, allowing for detailed analysis of their orbits and physical characteristics.
Prior to this, such extremely low-density planets were considered rare, but this discovery confirms they can exist even in close proximity within the same system, prompting a reevaluation of planetary formation theories.
“These planets are as large as Jupiter but have densities similar to cotton candy, which is unprecedented in exoplanet studies.”
— an anonymous researcher
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Unanswered Questions About the ‘Cotton Candy’ Planets
While the existence and basic properties of these planets are confirmed, many details remain uncertain. Researchers do not yet fully understand their atmospheric composition, how their low density affects their stability over time, or the specifics of their formation process. The long-term evolution and potential for habitability are still unknown.
Additionally, the exact mechanisms behind their extreme puffiness and the influence of their orbital interactions require further investigation. It is also unclear whether similar planets exist elsewhere or if these are unique cases.
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Future Studies and Observations of the ‘Puffy’ Worlds
Scientists plan to utilize upcoming telescope observations, including spectroscopy, to analyze the atmospheres of these planets. Continued monitoring will help clarify their rotational dynamics and stability. Researchers also aim to identify more such planets to determine whether these are rare anomalies or part of a broader class of ‘super puffy’ worlds.
Further modeling of their formation and evolution will be essential, with the goal of integrating these findings into broader planetary science frameworks. The next steps include detailed follow-up studies using ground-based telescopes and space observatories.
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Key Questions
Why are these planets called ‘cotton candy’ planets?
The planets are called ‘cotton candy’ because their densities are extremely low, making them very light and airy, similar to the texture of cotton candy. Despite their large size, they have very little mass.
How were these planets discovered?
They were detected through transit observations by NASA’s TESS spacecraft, which monitored the star’s light for over seven years. The gravitational interactions between the planets affected their transit timing, allowing researchers to estimate their masses and confirm their properties.
What makes these planets different from other gas giants?
Unlike typical gas giants like Jupiter, these planets have significantly less mass relative to their size, resulting in extremely low densities. They are some of the lightest planets of their size ever discovered.
Are these planets habitable?
Given their size, composition, and the fact that they are gaseous with extremely low densities, they are not considered habitable. The focus of research is on understanding their formation and physical properties.
Could similar planets be found elsewhere?
It is possible that other ‘super puffy’ planets exist, but they are rare. Ongoing surveys and future missions aim to identify more such worlds to understand their prevalence.
Source: Engadget
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