PRL scientists unveil dense Saturn-sized TOI-6651b exoplanet

In the realm of exoplanet science, scientists from India's Physical Research Laboratory (PRL) have revealed an astounding discovery. Using the sophisticated PARAS-2 spectrograph, they have discovered TOI-6651b, a dense exoplanet the size of Saturn that orbits a star similar to the Sun.

This is the fourth exoplanet that PRL scientists have found, highlighting India's increasing involvement in global space exploration.

With a radius almost five times greater than Earth's and a mass 60 times that of Earth, TOI-6651b is an unusual exoplanet.

The discovery of TOI-6651b, situated at the edge of the "Neptunian desert"—a region where planets of this size are rarely found—provides new insight into the formation and evolution of planets.

The Neptunian desert is a mysterious area where few planets of this size exist, making this discovery a unique opportunity to research why such planets are so rare.

This distant planet orbits its Sun-like host star, TOI-6651, in a close 5.06-day cycle, so its "year" is barely a fraction of an Earth month.

Its orbit is slightly oval in shape, or eccentric, setting it apart from conventional gas giants like Saturn in our solar system.

TOI-6651 is a G-type subgiant, somewhat larger and hotter than our Sun, with a surface temperature of around 5940 K.

The composition of TOI-6651b represents a significant achievement in the PRL team's research.

The planet's high density, with stony and iron-rich components making up around 87% of its mass, leaves the remaining mass as a lighter envelope of helium and hydrogen.

Because of its dense structure, TOI-6651b may have experienced unusual evolutionary processes, such as merging with other objects or losing a significant portion of its initial atmosphere due to tidal heating effects.

The finding of TOI-6651b calls into question existing ideas regarding planet formation and raises new queries about the evolution of such large and dense planets.

Scientists aim to learn more about the complex processes that form planetary systems by closely examining TOI-6651b, which would be a major accomplishment for India in the field of space science.