灼熱の太陽系外惑星、大きさ・質量は地球と同程度


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[October 31 AFP] It became clear that the earth, a size, and the mass of the exoplanet “Kepler 78b (Kepler-78b)” which exists in the distance very much from our solar system are comparable.
It is welcomed in case of the sign which may be turned to discovery of the planet similar to the earth that it has checked that mass and density were comparable as the earth although the skin temperature of “Kepler 78b” could not exceed 2000 degrees and a living thing could not survive in the environment of the “red heat.”
Two research teams which announced to ? English science journal Nature (Nature) the paper make mass of “Kepler 78b” measured, respectively 1.69 times of the earth, and 1.86 times.
moreover — density — ? — it has calculated with 5.3 g per cubic centimeter, and 5.57 g, and composition is referred to as that it is guessed that they are rock and iron.
From ? these mass, a radius (size), density, etc., “Kepler 78b” can call it the planet which resembled the earth most, while being checked until now.
“Kepler 78b” is doing the circumference of the fixed star 1 round in 8.5 hours.
Although it was difficult much to distinguish composition compared with measurement of a planetary size, in the case of “Kepler 78b”, since distance with a primary star was near, observation of the “Doppler shift” used as the key which deduces planetary mass was easy.
Mr. Drake Deming (DrakeDeming) of ? U.S. University of Maryland (University of Maryland) astronomy part about “Kepler 78b”, The point that existence of the planet which especially consists of rock and iron like the earth was shown has described “A presentiment of the big leap for the research which looks for the life outside the solar system is made to have.”
(c)AFP
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