Giant planet discovered orbiting tiny star
a year ago
- #exoplanet
- #planet-formation
- #astronomy
- Astronomers discovered a giant planet (TOI-6894b) orbiting a tiny red dwarf star (TOI-6894), challenging current planet formation theories.
- The star TOI-6894 is only 20% the mass of the Sun, making it the smallest known star to host a transiting giant planet.
- The planet TOI-6894b is a low-density gas giant, slightly larger than Saturn but with only half its mass.
- Current core accretion theory struggles to explain how such a massive planet could form around such a low-mass star.
- Alternative theories include intermediate core-accretion or gravitational disc instability, but neither fully explains TOI-6894b's formation.
- TOI-6894b has an unusually cool atmosphere (420 Kelvin) compared to typical hot Jupiters, making it a prime target for atmospheric studies.
- The James Webb Space Telescope (JWST) will observe TOI-6894b's atmosphere within the next year to gather more data on its formation.
- This discovery has significant implications for estimating the number of giant planets in our galaxy, as small stars like TOI-6894 are common.