Tau Ceti e
|Extrasolar planet||List of extrasolar planets|
|Right ascension||(α)||01h 44m 05s|
|Declination||(δ)||−15° 56′ 15″|
|Distance||11.905 ± 0.007 ly
(3.65 ± 0.002 pc)
|Mass||(m)||0.783 ± 0.012 M☉|
|Radius||(r)||0.793 ± 0.004 R☉|
|Temperature||(T)||5344 ± 50 K|
|Metallicity||[Fe/H]||−0.55 ± 0.05|
|Semimajor axis||(a)||0.552 ± 0.02 AU|
|Eccentricity||(e)||0.05 ± 0.02|
|Orbital period||(P)||168.12 ± 2.0 d
|Semi-amplitude||(K)||0.58  m/s|
|Minimum mass||(m sin i)||4.3 M⊕|
|Discovery date||19 December 2012|
|Discoverer(s)||Tuomi et al.|
|Discovery method||Radial velocity|
Tau Ceti e is an unconfirmed planet that may be orbiting the nearby Sun-like star Tau Ceti at a distance of 11.905 light years from the Sun. It is the fourth planet of the system in distance to its star.
As with the other four planets of Tau Ceti, it was detected by realizing statistical analyses of the data of the star's variations in radial velocity that were obtained using HIRES, AAPS, and HARPS.
Due to the detection method used, few properties of the planet are known other than its orbit and mass.
It orbits Tau Ceti at a distance of 0.552 AU (between Venus and Mercury' orbit in our Solar System) with an orbital period of 168 days and has a minimum mass of 4.3 Earth masses which classifies it as a super-Earth.
Tau Ceti e orbits within Tau Ceti's habitable zone.
Due to its proximity to Tau Ceti, it may be Venus-like with a very dense atmosphere causing on it a powerful greenhouse effect.
If it possesses an Earth-like atmosphere, the surface temperature would be around 70°C (343 K). At this temperature range, the only Earth life that could exist on the surface would be thermophiles.
- Tuomi, M.; et al (2013). "Signals embedded in the radial velocity noise: Periodic variations in the tau Ceti velocities". Astronomy & Astrophysics 551 (preprint): A79. arXiv:1212.4277. Bibcode:2012yCat..35519079T. doi:10.1051/0004-6361/201220509.
- Abel Mendez Torres (December 19, 2012). "Two Nearby Habitable Worlds?" (Press release). Planetary Habitability Laboratory @ UPR Arecibo. Retrieved 2013-12-28.