Tau Ceti e explained

Extrasolarplanet:	yes
Tau Ceti e
Apsis:	astron
Discovered:	December 19, 2012
Discovery Method:	Radial velocity
Alt Names:	52 Ceti e, Tau Ceti e
Semimajor:	0.552 AU
Period:	168 d
Mass:	≥3.93 M

Tau Ceti e, also called 52 Ceti e, is an 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 (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 .^[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]

A 2021 study was unable to confirm this planet.^[6]

Notes and 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.. O'Toole. Simon. Horner. Jonathan. Bailey. Jeremy. 2013. Signals embedded in the radial velocity noise. Periodic variations in the tau Ceti velocities. Astronomy & Astrophysics. 551. A79. 10.1051/0004-6361/201220509. 1212.4277. 2013A&A...551A..79T. 2390534. 0004-6361.
2. Web site: Four Exoplanets Detected around Nearby Star Tau Ceti Astronomy Sci-News.com. 2020-10-07. Breaking Science News Sci-News.com. en-US.
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. 10.3847/1538-3881/aa83b4. 1708.02051. 2017AJ....154..135F. 53500995. 1538-3881 . free .
4. Book: Bignami, Giovanni F.. The Mystery of the Seven Spheres: How Homo sapiens will Conquer Space. 2015-06-13. Springer. 978-3-319-17004-6. en.
5. Book: Guedel. M.. Dvorak. R.. Erkaev. N.. Kasting. J.. Khodachenko. M.. Lammer. H.. Pilat-Lohinger. E.. Rauer. H.. Ribas. I.. Wood. B. E.. Protostars and Planets VI. 2014. Astrophysical Conditions for Planetary Habitability. 10.2458/azu_uapress_9780816531240-ch038. 1407.8174. 9780816531240. 118447677.
6. Cretignier . Michael . Dumusque . Xavier . etal . September 2021 . YARARA: Significant improvement in RV precision through post-processing of spectral time series . . 653 . A43 . 10.1051/0004-6361/202140986 . 2106.07301 . 2021A&A...653A..43C.