Epsilon Indi Ab
Epsilon Indi Ab is a gas giant exoplanet orbiting the star Epsilon Indi A, about 11.9 light-years away in the constellation of Indus. The planet was confirmed to exist in 2018. It orbits at around 8.8 AU with a period of around 29.9 years and a relatively high eccentricity of 0.48, and has a mass around 3 times that of Jupiter. Direct imaging of this planet using the James Webb Space Telescope is planned.
| Discovery | |
|---|---|
| Discovered by | Fabo Feng, et al. |
| Discovery date | 21 March 2018 (suspected since 2002) |
| Radial velocity | |
| Orbital characteristics | |
| Epoch 2448929.56 JD | |
| 8.8+0.2 −0.1 AU | |
| Eccentricity | 0.48±0.01 |
| 10,932+266 −228 d 29.93+0.73 −0.62 yr | |
| 143.8°+23.38° −58.75° | |
| Inclination | 91°+4° −5° |
| 58°±5° | |
| 2442332.95+2353.42 −3450.17 JD | |
| 85°±3° | |
| Semi-amplitude | 29.22+5.45 −6.07 m/s |
| Star | Epsilon Indi A |
| Physical characteristics | |
| Mass | 3.0±0.1 MJ |
The Epsilon Indi system also contains a pair of brown dwarfs, Epsilon Indi Ba and Bb, at a wide separation from the primary star. As such, this system provides a benchmark case for the study of the formation of gas giants and brown dwarfs.
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