Discovering the Lightest Exoplanets: The Fascinating Case of TOI-791 b and c
The search for exoplanets has long captivated astronomers and space enthusiasts alike, but a recent breakthrough has shifted our understanding of gas giant compositions. Among the most intriguing findings are TOI-791 b and TOI-791 c, two planets located approximately 1110 light-years away in the Volans constellation. These planets are setting new standards for what we know about planet formation, atmosphere, and density, potentially rewriting the rules of planetary classification.
How Were These Exoplanets Discovered and Analyzed?
Using the highly sensitive TESS (Transiting Exoplanet Survey Satellite), scientists monitored periodic dimming in the star’s light as these planets crossed in front of it, a method known as transit observation. Combined with ground-based spectroscopic measurements that detect slight stellar radial velocity shifts, researchers precisely calculated the size, mass, and density of these planets. This multi-method approach confirmed the planets’ exceptional characteristics with high reliability, making them some of the most fluffy and lightweight gas giants known to science.
What Makes TOI-791 b and c Special?
Compared to familiar gas giants like Jupiter, these planets exhibit an estimated density nearly 35 times lower, implying they are enormous yet extremely light. They are primarily composed of hydrogen and helium, but their vast sizes don’t translate into high mass — instead, they possess a very low density. The planets’ atmospheres are likely thick and extended, potentially enveloping a small solid core, or possibly consisting mostly of gas with minimal rocky material. This makes them
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