Trappist-1 f

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Exoplanet
Trappist-1 f

Fictional representation of Trappist-1 f

Fictional representation of Trappist-1 f
Constellation Aquarius
Position
equinox : J2000.0
Right ascension 23h 06m 29.283s
declination -05 ° 02 ′ 28.59 ″
Orbit data
Central star Trappist-1
Major semi-axis 0.037 AU
eccentricity <0.063
Period of circulation 9.206690 (± 0.000015) days
Further data
radius 1.045 (± 0.038) earth radii
Dimensions 0.68 ± 0.18 earth masses
distance 12.1 ± 0.4 pc
history
Date of discovery 02/22/2017

Trappist-1 f , also known as 2MASS J23062928-0502285 f , is an exoplanet orbiting the dwarf star Trappist-1 in the habitable zone . It is located about 39 light years (12 parsecs ) from Earth in the constellation Aquarius .

Planet in the Trappist 1 system

Trappist-1f is the fifth of seven planets in its solar system, counted from its 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-1 f orbits its star with an orbit duration of about 9.206 days and an orbit radius of about 0.037 that of the earth's orbit.

properties

Trappist-1f is an earth-like planet . While its radius of 1.045 earth radii is almost identical to that of the earth, its mass is only 0.68 earth masses . Thus it has a lower density than the earth, only 3.3 ± 0.9 g / cm³, and a surface acceleration of about 6.1 m / s² (62% of the value of the earth). Its calculated equilibrium temperature is 219 K (−54 ° C).

Based on these properties, it is speculated that Trappist-1f may be an ocean world with an ice crust on the side facing away from the sun .

Habitability

The exoplanet orbits the star either inside or just outside 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 0.68.

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

  1. ^ HEC: Data of Potentially Habitable Worlds - Planetary Habitability Laboratory @ UPR Arecibo. In: upr.edu. phl.upr.edu, accessed March 14, 2017 .