HD 11343
Binary system with two gas giant exoplanets.
HD 11343 is a wide binary system in the southern constellation Eridanus, approximately 500 light-years distant, consisting of a K-type borderline giant star and a red dwarf companion. It is notable for hosting two gas giant exoplanets discovered via radial-velocity observations.
Quick Facts
- Apparent magnitude
- 7.88
- Distance
- about 500 ly
- Spectral type (primary)
- K2
- Effective temperature (primary)
- 4670 K
- Mass (primary)
- slightly more massive than the Sun (one estimate places it at 2.0 solar masses)
- Radius (primary)
- approximately eight times solar
- Luminosity (primary)
- 25 times solar
Facts from the source article.
Stellar characteristics
The primary component, HD 11343 A, is a red-giant branch star with an effective temperature of 4670 K and a spectral type of K2. It is slightly metal-poor, having an iron content 71% that of the Sun. A 2021 survey using Gaia DR3 data identified a 13th-magnitude M-dwarf companion, HD 11343 B, which orbits at a separation of roughly 2600 AU. This companion has about 70% of the Sun's mass and radius and a cooler temperature of 4351 K.
Planetary system
HD 11343 b, a super-Jupiter discovered in 2016, has a mass of 5.7 Jupiter masses and orbits at a semi-major axis of 2.8 AU with a period of 1585 days in a mildly eccentric orbit. A second planet, HD 11343 c, found in 2022, is a Jupiter analog with a minimum mass of 0.804 Jupiter masses, orbiting at 0.923 AU every 228.5 days; its orbital inclination is poorly constrained. The discovery paper for HD 11343 c presents alternative values for HD 11343 b: a higher mass, semi-major axis of 3.729 AU, orbital period of 5.07 years, and eccentricity of 0.360.
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