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Attributed claims
The cited abstract reports TRAPPIST-1 as the first transiting planet system found orbiting an ultracool dwarf.
DOCUMENTED_CLAIM · Historical description in the supplied 2017 record; not independently verified here.
The cited abstract reports at least seven planets similar to Earth in radius and mass transiting the host star.
DOCUMENTED_CLAIM · Planet count and comparison as stated in the source; the qualifier at least is retained.
K2 observations and dynamical relationships yielded a reported 18.77 d orbital period for TRAPPIST-1h.
DOCUMENTED_CLAIM · Reported orbital-period result; the supplied material does not independently remeasure it.
The source reports that the 18.77 d value matches expectations from Laplace relations and forms part of a chain of three-body resonances linking every member, with TRAPPIST-1h as the seventh member.
DOCUMENTED_CLAIM · Dynamical interpretation reported by the 2017 study; not independently checked within the supplied material.
The source reports a radius of 0.727 Earth radii and an equilibrium temperature of 173 K for TRAPPIST-1h.
DOCUMENTED_CLAIM · Source-reported planetary parameters; equilibrium temperature is not a surface-temperature measurement.
The source reports a 3.3 d stellar rotation period and says the detected flares were consistent with a low-activity, middle-aged, late M dwarf.
DOCUMENTED_CLAIM · The qualified wording is retained; the supplied abstract does not make those descriptors definitive classifications.
Whether the system has exactly seven transiting planets, rather than at least seven reported in the abstract, is not established by the supplied material.
UNKNOWN · Planet-count exhaustiveness; no later or independent source is supplied.
Whether any TRAPPIST-1 planet is inhabited or habitable is not established by the supplied orbital record.
UNKNOWN · The supplied material contains no life detection or later atmospheric study and limits this revision to the cited orbital report.
The arXiv record lists an initial submission on 12 March 2017, a last revision on 22 May 2017 as version 2, and a journal reference to Nature Astronomy 1, 0129 (2017).
DOCUMENTED_CLAIM · Bibliographic metadata reproduced from the supplied record.
Connected encyclopedia entries
TRAPPIST-1
The supplied 2017 record describes TRAPPIST-1 as a transiting planetary system around an ultracool dwarf. It reports at least seven planets similar to Earth in radius and mass transiting the host, an 18.77 d period for the outermost planet TRAPPIST-1h, and a linked three-body resonant chain. The supplied material does not establish life or habitability.