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Kepler-37b
Kepler-37b is an extrasolar planet (exoplanet) orbiting Kepler-37 in the constellation Lyra.〔(Smallest Alien Planet Kepler-37b Explained (Infographic) )〕 it is the smallest planet discovered around a main-sequence star, with a radius slightly greater than that of the Moon. The measurements do not constrain its mass, but masses above a few times that of the Moon give unphysically high densities.〔
==Discovery==
Kepler-37b, along with two other planets, Kepler-37c and Kepler-37d, were discovered by the Kepler space telescope, which observes stellar transits. After observing transits of Kepler-37b, astronomers had to compare it with the size of the parent star.
The size of the star was obtained using asteroseismology; Kepler-37 is currently the smallest star to be studied using this process.〔 This allowed the size of Kepler-37b to be determined "with extreme accuracy".〔
To date, Kepler-37b is the smallest planet discovered around a main-sequence star〔The pulsar planet PSR B1257+12 A has a comparable mass. The actual size of PSR B1257+12 A is unknown, but is likely comparable to Kepler-37b.〕 outside the Solar System.〔 Detection of Kepler-37b was possible due to its short orbital period, relative brightness, and low activity of its host star, allowing brightness data to average out quickly.〔( Centauri Dreams - Small Planets Confirm Kepler’s Capabilities )〕 The discovery of Kepler-37b has led Jack Lissauer, a scientist at NASA's Ames Research Center, to conjecture that "such little planets are common".〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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