Description

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Context

Scientists just discovered TOI-6894b, a huge planet circling a very small red dwarf star, challenging previous beliefs.

TOI-6894b, a gas giant planet around the size of Saturn, has been discovered orbiting an abnormally small red dwarf star.

This unusual coupling contradicts existing theories, which state that tiny stars do not have enough material in their surrounding disks to generate such huge planets.
The planet was discovered in the constellation Leo, approximately 241 light years away from Earth.
TOI-6894b is approximately 1.07 times the diameter of Saturn, but weighs slightly more than half of it.
This results in the planet having a relatively low density, akin to that of a beach ball. Despite its huge size, the planet circles very close to its home star, completing a full revolution in slightly under three Earth days.
TOI-6894, the star it circles, is a red dwarf that is only about 21% the mass of the Sun and around 250 times fainter.
In terms of physical dimensions, the star is only 2.5 times wider than the planet, an unusual size ratio in planetary systems.

Challenges to Core Accretion Theory	The core accretion model struggles to explain the formation of a giant planet like TOI-6894b around a low-mass star due to limited material in the disk.
Implications for Exoplanet Science	The discovery suggests that gas giants may be more common around small stars than previously believed, challenging existing models of planetary formation.
Future Studies	TOI-6894b is set for atmospheric observation by the James Webb Space Telescope (JWST), which may reveal detailed insights into its composition and origin.

Practice Question:

Q. Consider the following statements about TOI-6894b:

It is an exoplanet classified as an ultrahot Jupiter.
It orbits a high-mass, Sun-like star located in the Andromeda Galaxy.
The planet challenges the core accretion theory of planet formation.
It is scheduled for atmospheric observation by the James Webb Space Telescope (JWST).

Which of the statements given above is/are correct?

Options:

(a) 1, 2 and 4 only
(b) 1, 3 and 4 only
(c) 2 and 3 only
(d) 1 and 3 only

(b) 1, 3 and 4 only

Statement 1 – Correct: TOI-6894b is classified as an ultrahot Jupiter, a type of gas giant with very high surface temperatures.
Statement 2 – Incorrect: TOI-6894b orbits a low-mass star, not a high-mass Sun-like star, and is located within the Milky Way, not in the Andromeda Galaxy.
Statement 3 – Correct: The discovery challenges the core accretion theory, which struggles to explain how such a planet forms around a low-mass star.
Statement 4 – Correct: TOI-6894b is scheduled for atmospheric study by JWST, which could offer insights into its formation and composition.