TRAPPIST-1d
Small Venus-like exoplanet orbiting TRAPPIST-1 / From Wikipedia, the free encyclopedia
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TRAPPIST-1d, also designated as 2MASS J23062928-0502285 d, is a small exoplanet (about 40 percent the mass of the Earth), which orbits on the inner edge of the habitable zone of the ultracool dwarf star TRAPPIST-1, located 40.7 light-years (12.5 parsecs) away from Earth in the constellation of Aquarius. The exoplanet was found by using the transit method. The first signs of the planet were announced in 2016, but it was not until the following years that more information concerning the probable nature of the planet was obtained. TRAPPIST-1d is the second-least massive planet of the system and is likely to have a compact hydrogen-poor atmosphere similar to Venus, Earth, or Mars.[6] It receives just 4.3% more sunlight than Earth, placing it on the inner edge of the habitable zone.[7] It has about <5% of its mass as a volatile layer, which could consist of atmosphere, oceans, and/or ice layers.[3] A 2018 study by the University of Washington concluded that TRAPPIST-1d might be a Venus-like exoplanet with an uninhabitable atmosphere.[8] The planet is an eyeball planet candidate.[9]
Discovery[1] | |
---|---|
Discovered by | Michaël Gillon et al. |
Discovery site | TRAPPIST |
Discovery date | May 2, 2016 |
Transit | |
Orbital characteristics[2] | |
0.02227±0.00019 AU | |
Eccentricity | 0.00837±0.00093[3] |
4.049219±0.000026 d | |
Inclination | 89.896°±0.077° |
−8.73°±6.17°[3] | |
Star | TRAPPIST-1[4] |
Physical characteristics[2] | |
Mean radius | 0.788+0.011 −0.010 R🜨 |
Mass | 0.388±0.012 M🜨 |
Mean density | 4.354+0.156 −0.163 g/cm3 |
0.624±0.019 g 6.11±0.19 m/s2 | |
Temperature | Teq: 286.2±2.8 K (13.1 °C; 55.5 °F)[5] |