Аннотация
The TRAPPIST-1 system is the first transiting planet system found orbiting an
ultra-cool dwarf star. At least seven planets similar to Earth in radius and in
mass were previously found to transit this host star. Subsequently, TRAPPIST-1
was observed as part of the K2 mission and, with these new data, we report the
measurement of an 18.764 d orbital period for the outermost planet,
TRAPPIST-1h, which was unconstrained until now. This value matches our
theoretical expectations based on Laplace relations and places TRAPPIST-1h as
the seventh member of a complex chain, with three-body resonances linking every
member. We find that TRAPPIST-1h has a radius of 0.715 Earth radii and an
equilibrium temperature of 169 K, placing it at the snow line. We have also
measured the rotational period of the star at 3.3 d and detected a number of
flares consistent with an active, middle-aged, late M dwarf.
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