TRAPPIST-1
 

2MASS J23062928-0502285, also known as TRAPPIST-1, is an ultracool dwarf star. located 39.13 light-years (12.0 pc) away in the Aquarius constellation.

 

A team of astronomers headed by Michaël Gillon of the Institut d’Astrophysique et Géophysique at the University of Liège in Belgium used the TRAPPIST (Transiting Planets and Planetesimals Small Telescope) telescope at the La Silla Observatory in the Atacama desert, Chile, to observe TRAPPIST-1 and search for orbiting planets. By utilising transit photometry, they discovered three Earth-sized planets orbiting the dwarf star; the innermost two are tidally locked to their host star while the outermost appears to lie either within the system's habitable zone or just outside of it. The team made their observations from September to December 2015 and published its findings in the May 2016 issue of the journal Nature.

 

The ultracool dwarf star is not much larger in diameter than Jupiter and emits a tiny fraction of our Sun's total luminosity. The three small planets orbit the dwarf closely (at 1%, 1.5% and 3% of the distance that the Earth orbits from the Sun). A year on the closest planet passes in only 1.5 Earth days, the second is in 2.4 Earth days and the orbit of the third planet is less certain, with a year passing in 4.5 to 73 Earth days. It is important to note that tidally locked planets likely have very large differences in temperature between their permanently lit daysides and their permanently dark nightsides, which could produce very strong winds circling the planets while making the best places for life close to the mild twilight regions between the 2 sides.

 

Planets:
TRAPPIST-1d
TRAPPIST-1d is an exoplanet orbiting around the ultracool dwarf star TRAPPIST-1 approximatly 40 light-years in the const ...
TRAPPIST-1c
During formation of the system it is possible that water loss during pre-HZ periods occurred. Its estimated that TRAPPIS ...
TRAPPIST-1b
During formation of the system it is possible that water loss during pre-HZ periods occurred. Its estimated that TRAPPIS ...
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