GJ 3021 b, also known as Gliese 3021 b or HD 1237 b, is an extrasolar planet approximately 57 light-years away, orbiting its bright G-dwarf parent star in the Southern constellation of Hydrus. It was discovered with the Swiss Euler Telescope at the Chilean La Silla Observatory in 2000.[2]

GJ 3021 b
GJ 3021 b
Discovered byNaef, Mayor, Queloz
Discovery siteEULER, La Silla, Chile
Discovery date25 January 2000
Radial velocity
Orbital characteristics
0.495 AU (74,100,000 km)[1]
Eccentricity0.511 ± 0.017[1]
133.71 ± 0.20[1] d
2,451,545.86 ± 0.64[1]
290.7 ± 3.0[1]
Semi-amplitude167.0 ± 4.0[1]
StarGJ 3021

As determined by doppler spectroscopy, the jovian planet has an elongated orbit about 0.5 AU from its host star and a minimum mass 3.37 times that of Jupiter. Its orbital period of more than 133 days is much longer than that for typical hot Jupiters.[2]

A study published in 2001 suggested that the usual inability to determine the orbital inclination of an extrasolar planet through radial velocity measurement had caused this mass to be severely underestimated.[3] The astrometric orbit gives an orbital inclination of 11.8° and a mass of 16 Jupiter masses, which would make the object a brown dwarf. However, later analysis showed that Hipparcos was not sensitive enough to accurately determine astrometric orbits for substellar companions, which means the inclination (and hence the true mass) of the planet are still unknown.[4]

References edit

  1. ^ a b c d e f Butler, R. P.; et al. (2007). "Catalog of Nearby Exoplanets". Retrieved 2007-07-28.
  2. ^ a b Naef, D.; et al. (2001). "The CORALIE survey for southern extrasolar planets V. 3 new extrasolar planets". Astronomy and Astrophysics. 375 (1): 205–218. arXiv:astro-ph/0106255. Bibcode:2001A&A...375..205N. doi:10.1051/0004-6361:20010841. S2CID 16606841.
  3. ^ Han; et al. (2001). "Preliminary astrometric masses for proposed extrasolar planetary companions". The Astrophysical Journal Letters. 548 (1): L57–L60. Bibcode:2001ApJ...548L..57H. doi:10.1086/318927.
  4. ^ Pourbaix, D.; Arenou, F. (2001). "Screening the Hipparcos-based astrometric orbits of sub-stellar objects". Astronomy and Astrophysics. 372 (3): 935–944. arXiv:astro-ph/0104412. Bibcode:2001A&A...372..935P. doi:10.1051/0004-6361:20010597. S2CID 378792.

External links edit