Tau Ceti e, also known as Planet Tau e (タウe (イー)星, Tau ī Hoshi) or simply Tau e (タウe (イー), Tau ī), is a rocky exoplanet roughly three times as large as Earth located in orbit around the star Tau Ceti in the constellation Cetus which was discovered in 2012. Based upon the incident flux upon the planet, a study by Güdel et al. However, using an astronomical interferometer, measurements of the radius of the star can be made directly to an accuracy of 0.5%. [70], This article is about the star. Tau Ceti is a Binary or Multiple star system. [47][52] General research has shown a positive correlation between the presence of planets and a relatively high-metallicity parent star, suggesting that stars with lower metallicity such as Tau Ceti have a lower chance of having planets. The updated 4-planet model is dynamically packed and potentially stable for billions of years. This gives it roughly four times Earth's volume. [24], The radial velocity of a star is the component of its motion that is toward or away from the Sun. Its mass is 3.93 Earths, it takes 162.9 days to complete one orbit of its star, and is 0.538 AU from its star. [58] However, a 2015 study implies that it has been in the temperate zone for less than one billion years, so there may not be a detectable biosignature. [1][2] Its possible properties were refined in 2017: it orbits 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 3.93 Earth masses. [15][nb 4] A 2020 study in the same journal predicted candidates aligning with b, c, and d, as well as at least one between e and f within the habitable zone. [60] The relative lack of debris around the Sun may be the unusual case: one research-team member suggests the Sun may have passed close to another star early in its history and had most of its comets and asteroids stripped away. [59], Few properties of the planet are known other than its orbit and mass. [32], The rotation period for Tau Ceti was measured by periodic variations in the classic H and K absorption lines of singly ionized calcium (Ca II). Given its stability, similarity and relative proximity to the Sun, Tau Ceti is consistently listed as a target for the Search for Extra-Terrestrial Intelligence (SETI) and appears in some science fiction literature. If Tau Ceti e possessed an Earth-like atmosphere, the surface temperature would be around 68 °C (154 °F). [27] This result can then be used to compute an orbital path of Tau Ceti through the Milky Way. Hello and welcome to What Da Math! This planet is similar in mass, size, density, and surface gravity to Saturn, but it is much colder. Se saa keskustähtensä valoa vain 28.5 % siitä, mitä Maa saa Auringosta. Principal factors driving research interest in Tau Ceti are its proximity, its Sun-like characteristics, and the implications for possible life on its planets. Due to its proximity to Tau Ceti (0.552 AU), it may be Venus-like with a very dense atmosphere causing on it a powerful greenhouse effect. Les deux planètes les plus lointaines, un quart de la taille de votre Terre, n’ont pas d’atmosphère. (2014) speculated that the planet may lie outside the habitable zone and closer to a Venus-like world. The interstellar medium of dust and gas from which stars form is primarily composed of hydrogen and helium with trace amounts of heavier elements. Tau Ceti is considered to be a high-proper-motion star, although it only has an annual traverse of just under 2 arc seconds. They orbit tau Ceti once every 20, 49, 160 and 642 days, respectively. [56] Based upon the incident flux upon the planet, a study by Güdel et al. Like our sun Tau Ceti is a G-type main sequence star. [5], "Four Exoplanets Detected around Nearby Star Tau Ceti | Astronomy | Sci-News.com", https://en.wikipedia.org/w/index.php?title=Tau_Ceti_e&oldid=998087901, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License, This page was last edited on 3 January 2021, at 19:21. The star appears stable, with little stellar variation, and is metal-deficient. Artist's impression of the Tau Ceti systemPicture credit: J. Pinfield for the RoPACS network at the University of Hertfordshire, 2012. Tau Ceti (τ Cet / τ Ceti) è una stella visibile nella costellazione della Balena, di magnitudine +3,50. [nb 3] Thus it will require about 2000 years before the location of this star shifts by more than a degree. It lies somewhat closer to its star than Venus does to the sun and thus revolves faster than Earth. [60], Tau Ceti shows that stars need not lose large disks as they age, and such a thick belt may not be uncommon among Sun-like stars. [15] Because of its debris disk, any planet orbiting Tau Ceti would face far more impact events than Earth. If a planet corresponding to this predicted candidate is confirmed, as of August 2020 it would be designated as Tau Ceti i in accordance with IAU exoplanet naming policies, Search for Extra-Terrestrial Intelligence, List of nearest terrestrial exoplanet candidates, Centre de données astronomiques de Strasbourg, "Magnetic Field and Rotation in Lower Main-Sequence Stars: an Empirical Time-dependent Magnetic Bode's Relation? (2014) speculated that the planet may lie outside the habitable zone and closer to a Venus-like world. At this distance, the dust belt may be analogous to the Kuiper belt that lies outside the orbit of Neptune in the Solar System. If it possesses an Earth-like atmosphere, the surface temperature would be around 70°C (343 K). Tau Ceti a par exemple fait l'objet de nombreuses études dans le cadre du programme SETI de recherche de vie extraterrestre. 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