TOI-849

1. 본문

TOI-849 is a star system located about 700-741 light-years away from Earth in the constellation Sculptor. It hosts at least one known exoplanet, TOI-849 b.
TOI-849 b

• Discovery: Discovered in 2020 by NASA's Transiting Exoplanet Survey Satellite (TESS), and confirmed by the HARPS spectrograph.
• Type: It's considered a candidate chthonian planet, which is the exposed core of a gas giant that has lost most of its atmosphere.
• Orbit: It orbits very closely to its star with the orbital period of 0.765 days (about 18 hours). The semi-major axis is 0.01598 AU.
• Size: It has a radius of about 3.4 times that of Earth, similar to Neptune.
• Mass: It's much more massive than Neptune, at about 39-40 times the mass of Earth.
• Density: TOI-849 b has a high density of about 5.2-5.5 g/cm³, similar to Earth, and it is the densest Neptune-sized planet discovered.
• Composition: It's believed to be the remnant core of a gas giant. The gaseous envelope is estimated to compose no more than about 4% of planet's mass.

• It is the first discovery of its kind.
• It provides a unique opportunity to study the core of a planet.
• It offers new insights to the formation of planets.