Trappist-1 e
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Exoplanet Trappist-1 e |
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| Fictional representation of Trappist-1 e | |
| Constellation | Aquarius |
| Position equinox : J2000.0 |
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| Right ascension | 23h 06m 29.36s |
| declination | -05 ° 02 ′ 28.59 ″ |
| Orbit data | |
| Central star | Trappist-1 |
| Major semi-axis | 0.02817 AU |
| eccentricity | <0.085 |
| Period of circulation | 6.099615 ± 0.000011 days |
| Further data | |
| radius | 0.918 (± 0.039) earth radii |
| Dimensions | 0.62 (± 0.58) earth masses |
| distance | 12.1 ± 0.4 pc |
| history | |
| Date of discovery | 02/22/2017 |
Trappist-1 e , also called 2MASS J23062928-0502285 e , is an exoplanet orbiting the dwarf star Trappist-1 in the habitable zone . It is located about 40 light years (12 parsecs ) from Earth in the constellation Aquarius .
Planet in the Trappist 1 system
Trappist-1e is the fourth of seven planets from the star. It is one of the four planets around Trappist-1 that were found with the Spitzer Space Telescope using the transit method . Presumably all planets of the Trappist-1 system orbit the dwarf star in a bound rotation , that is, one side of the planets is continuously illuminated by the star (perpetual day, warm) and one side never (perpetual night, cold), in between there is an annular one Medium temperature zone.
Trappist-1e orbits its star with an orbit duration of about 6 days and an orbit radius of about 0.028 that of the earth's orbit.
properties
Trappist-1e is an earth-like planet . With 0.92 earth radii, it is slightly smaller than earth and has a mass of 0.62 that of the earth . Thus it has a slightly lower density than the earth, 4.39 g / cm³, and a surface acceleration of about 7.22 m / s² (about 74% of the value of the earth). Its calculated equilibrium temperature is 251.3 K (−22 ° C).
Because of these properties, it is speculated that Trappist- 1e could be an ocean world .
Habitability
The exoplanet orbits the star inside the habitable zone. This means that under certain suitable conditions and atmospheric properties, liquid water could exist on the surface of the planet. It has an Earth Similarity Index of 0.85.
So far nothing is known about the chemical composition and possible atmosphere of the planet.
See also
literature
- Michaël Gillon, Emmanuël Jehin, Susan M. Lederer, Laetitia Delrez, Julien de Wit, Artem Burdanov, Valérie Van Grootel, Adam J. Burgasser, Amaury HMJ Triaud, Cyrielle Opitom, Brice-Olivier Demory, Devendra K. Sahu, Daniella Bardalez Gagliuffi , Pierre Magain, Didier Queloz: Temperate Earth-sized planets transiting a nearby ultracool dwarf star . In: Nature . 2016, doi : 10.1038 / nature17448 ( eso.org [PDF]).
Individual evidence
- ^ HEC: Data of Potentially Habitable Worlds - Planetary Habitability Laboratory @ UPR Arecibo. In: upr.edu. phl.upr.edu, accessed March 14, 2017 .