Tau Ceti e

Artistic depiction of Tau Ceti e as a terrestrial planet.

Discovery
Discovery date| December 19, 2012

Detection method

| Radial velocity
Designations

Alternative names

| 52 Ceti e, Tau cet e
Orbital characteristics

Semi-major axis

| 0.552 AU
Orbital period| 168 d
Physical characteristics
Mass| ≥3.93 M🜨

Short description: Super-Earth exoplanet orbiting Tau Ceti

Tau Ceti e, also called 52 Ceti e, is an unconfirmed exoplanet candidate orbiting Tau Ceti, first detected in 2012 by statistical analyses of the star's variations in radial velocity obtained using HIRES, AAPS and HARPS.[1][2] Its possible properties were refined in 2017, where it was one of two planets recovered from new data, the other being Tau Ceti f. It would orbit at a distance of 0.552 astronomical unit|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 3.93 Earth masses.[3] If Tau Ceti e possesses an Earth-like atmosphere, the surface temperature would be around 68 °C (341 K; 154 °F).[4] Based upon the incident flux upon the planet, a study by Güdel et al. (2014) speculated that the planet may lie inside the inner-boundary of the habitable zone and be a Venus-like world.[5]

## References

1. ↑ Tuomi, Mikko; Jones, Hugh R. A.; Jenkins, James S.; Tinney, Chris G.; Butler, R. Paul; Vogt, Steve S.; Barnes, John R.; Wittenmyer, Robert A. et al. (2013). "Signals embedded in the radial velocity noise. Periodic variations in the tau Ceti velocities". Astronomy & Astrophysics 551: A79. doi:10.1051/0004-6361/201220509. ISSN 0004-6361. Bibcode: 2013A&A...551A..79T.
2. ↑ "Four Exoplanets Detected around Nearby Star Tau Ceti | Astronomy | Sci-News.com" (in en-US). http://www.sci-news.com/astronomy/tau-ceti-exoplanets-05117.html.
3. ↑ Feng, Fabo; Tuomi, Mikko; Jones, Hugh R. A.; Barnes, John; Anglada-Escude, Guillem; Vogt, Steven S.; Butler, R. Paul (2017-09-05). "Color difference makes a difference: four planet candidates around tau Ceti". The Astronomical Journal 154 (4): 135. doi:10.3847/1538-3881/aa83b4. ISSN 1538-3881. Bibcode: 2017AJ....154..135F.
4. ↑ Bignami, Giovanni F. (2015-06-13) (in en). The Mystery of the Seven Spheres: How Homo sapiens will Conquer Space. Springer. ISBN 978-3-319-17004-6. https://books.google.com/books?id=crvpCQAAQBAJ&pg=PA110.
5. ↑ Guedel, M.; Dvorak, R.; Erkaev, N.; Kasting, J.; Khodachenko, M.; Lammer, H.; Pilat-Lohinger, E.; Rauer, H. et al. (2014). "Astrophysical Conditions for Planetary Habitability". Protostars and Planets VI. doi:10.2458/azu_uapress_9780816531240-ch038. ISBN 9780816531240.

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