TOI-849 b is an exoplanet orbiting the late-G type star TOI-849. It is a candidate chthonian planet, the exposed core of a gas giant that had much of its atmosphere stripped away.[1] It is over 700 lightyears away from Earth, that equal to over 4,000,000,000,000,000 miles. That the same as 44,000,000 trips from the Earth to the Sun.[2]
| Discovery[1] | |
|---|---|
| Discovered by | TESS |
| Discovery date | 2020 |
| Transit | |
| Orbital characteristics[1] | |
| 0.01598+0.00013 −0.00014 AU | |
| Eccentricity | 0 |
| 0.76552414+0.00000262 −0.00000279 d | |
| Inclination | 86.8°+2.1° −2.4° |
| Star | TOI-849 |
| Physical characteristics[1] | |
| 3.444+0.157 −0.115 R🜨 | |
| Mass | 39.09+2.66 −2.55 M🜨 |
Mean density | 5.2+0.7 −0.8 g/cm3 |
Characteristics
editTOI-849 b is a high-density planet more massive than Neptune, about forty times the mass of Earth. It orbits very close to its host star, with a period of less than one day, placing it within the Neptunian desert.[1][3]
Compared to other Neptune-sized exoplanets, this planet is unusually massive and dense. It is about 40 times the mass of Earth, but only about 3.4 times Earth's radius. This implies that any gaseous envelope of hydrogen and helium makes up at most 3.9+0.8
−0.9 percent of the planet's mass. However, given the planet's size, its density is still too low for a purely rocky composition.[1]
The gravity of such a massive planet would be expected to accrete large amounts of gas from the protoplanetary disk in which it formed, causing it to become a gas giant. It is thought that TOI-849 b could be the remnant core of a gas giant.[1] A 2021 modeling study found that the stellar radiation received by the planet could have removed the entire gaseous envelope even if it formed as a Jupiter-mass planet.[4]
References
edit- ^ a b c d e f g Armstrong, David J.; Lopez, Théo A.; Adibekyan, Vardan; et al. (June 1, 2020). "A remnant planetary core in the hot-Neptune desert". Nature. 583 (7814): 39–42. arXiv:2003.10314. Bibcode:2020Natur.583...39A. doi:10.1038/s41586-020-2421-7. PMID 32612222. S2CID 214612138.
- ^ Mr. DeMaio (Mr. DeMaio) (2024-01-06). The Ghost Planet!. Retrieved 2024-11-01 – via YouTube.
- ^ "The Extrasolar Planet Encyclopaedia — TOI-849 b". Extrasolar Planets Encyclopaedia. Retrieved 11 September 2023.
- ^ Pezzotti, C.; Attia, O.; et al. (October 2021). "The key impact of the host star's rotational history on the evolution of TOI-849b". Astronomy & Astrophysics. 654: L5. arXiv:2110.09364. Bibcode:2021A&A...654L...5P. doi:10.1051/0004-6361/202141734.