Tau Ceti e

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Tau Ceti e
Extrasolar planet List of extrasolar planets
Parent star
Star Tau Ceti
Constellation Cetus
Right ascension (α) 01h 44m 05s
Declination (δ) −15° 56′ 15″
Apparent magnitude (mV) 3.50
Distance 11.905 ± 0.007 ly
(3.65 ± 0.002 pc)
Spectral type G8.5V
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
Age 5.8 Gyr
Orbital elements
Semimajor axis (a) 0.552 ± 0.02[1] AU
Eccentricity (e) 0.05 ± 0.02[1]
Orbital period (P) 168.12 ± 2.0[1] d
(0.46 y)
Mean anomaly (M) 28.65[1]°
Semi-amplitude (K) 0.58 [1] m/s
Physical characteristics
Minimum mass (m sin i) 4.3[1] M
Discovery information
Discovery date 19 December 2012
Discoverer(s) Tuomi et al.
Discovery method Radial velocity
Discovery status Unconfirmed
Database references
Extrasolar Planets
Encyclopaedia
data
SIMBAD data

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.

It is notable due to its habitability and Earth-like properties, with an Earth Similarity Index of 0.77 and an orbit that places it on the hot inner edge of Tau Ceti's habitable zone.[2]

Discovery[edit]

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.[1]

Characteristics[edit]

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 the orbits of Venus and Mercury in the Solar System) with an orbital period of 168 days and has a minimum mass of 4.3 Earth masses, which means it is a super-Earth.

Tau Ceti e orbits within Tau Ceti's habitable zone.

Habitability[edit]

Little is currently known of the nature of super-Earths. Though assuming it is a terrestrial planet like Earth, it would likely be 1.8 times larger in size than the Earth.[citation needed]

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.[2]

References[edit]

  1. ^ a b c d e f g 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. 
  2. ^ a b Abel Mendez Torres (December 19, 2012). "Two Nearby Habitable Worlds?" (Press release). Planetary Habitability Laboratory @ UPR Arecibo. Retrieved 2013-12-28. 

See also[edit]