Tau Ceti e ( τ Cet e) is an unconfirmed exoplanet of the sun-like star Tau Ceti , located 12 light-years from the solar system in the constellation Ceti . At the time of opening in December 2012, it was the fourth in remoteness from the star.
| Tau whale e | |
|---|---|
| Exoplanet | |
| Parent star | |
| Star | Tau whale |
| Constellation | Whale |
| Right Ascension ( α ) | 01 h 44 m 05 s |
| Declination ( δ ) | −15 ° 56 ′ 15 ″ |
| Visible magnitude ( m V ) | 3,50 |
| Distance | 11.905 ± 0.007 St. of the year (3.65 ± 0.002 pc ) |
| Spectral class | G8.5 V |
| Metallicity ([Fe / H]) | −0.55 ± 0.05 |
| Age | 5.8 billion years |
| Elements of the orbit | |
| Semimajor axis ( a ) | 0.55 ±? [1] a. e. |
| Eccentricity ( e ) | 0.05 ±? [one] |
| Orbital Period ( P ) | 168 [1] d. (0.46 l. ) |
| Radial half-amplitude ( K ) star speed | ? [1] m / s |
| physical characteristics | |
| Weight ( m ) | 0.014 ±? M j |
| Minimum Weight ( m sin i ) | 4.3 [1] M ⊕ |
| Radius ( r ) | ? R j |
| Temperature ( T ) | 341 ±? K |
| Discovery Information | |
| opening date | December 19, 2012 |
| Detection method | Radial speed |
| Opening status | Not confirmed |
Content
Opening
In December 2012, a group of astronomers from Britain , Chile , the USA and Australia announced the discovery of 5 exoplanets in the star Tau Ceti [1] . After studying periodic fluctuations in the radial velocity of the star, scientists concluded that the planets are in stable orbits close to circular ones [2] . Independent observations by other astronomers are necessary to confirm the existence of these planets [3] .
Features
The detection method used does not allow us to determine most of the properties of the planet , with the exception of its orbit and mass.
It rotates at a distance of ~ 0.55 a. e. from a star with a circulation period of approximately 168 days and has a minimum mass of ~ 4.3 Earth masses , which allows it to be classified as super-earth .
Possible habitability
It is possible that the planet Tau Kita e is viable , as it rotates around its star near the inner edge of the habitable zone . The planet receives about 60 percent more light than the Earth from the Sun , which heats it very much and, possibly, it has the conditions necessary for the emergence of life of only simple thermophilic (i.e. heat-loving) organisms - a type of extremophile that thrives at temperatures of 45–122 ° C. If there is an atmosphere similar to the Earth’s, then the average temperature of the planet’s surface will be almost 70 degrees Celsius. The climate on Tau Kita e, therefore, would be due to a strong greenhouse effect, which makes the planet more like a “super-venere” than a super-earth. Without additional information about its atmosphere, scientists are not yet able to make a statement as to whether it is warm or hot, similar to unsuitable Venus for life. If Tau Ceti e is estimated based on the Earth’s atmosphere, then it has an Earth similarity index (ESI) of 0.77.
Tau Ceti Interstellar Expedition
Tau Ceti is located 12 light years from the solar system . At the moment, even using modern technology, sending a mission to Tau Kita is impossible. The fastest moving artificial space object is Voyager 1 , whose speed relative to the Sun at the moment is ~ 17 km / s . But even his journey to the planet Tau Ceti e would take 212 years .
Notes
- ↑ 1 2 3 4 5 6 Tuomi, M .; et al. Signals embedded in the radial velocity noise: Periodic variations in the tau Ceti velocities (Eng.) // Astronomy and Astrophysics : journal. - EDP Sciences 2013. - Vol. 551 . - P. A79 . - DOI : 10.1051 / 0004-6361 / 201220509 . - . - arXiv : 1212.4277 .
- ↑ Five exoplanets discovered at the star of Tau Ceti
- ↑ Five planets found in the star of Tau Ceti, including a potentially inhabited