๐Ÿš€ ๅฎ‡ๅฎ™ใฎ่จ˜ๆ†ถใƒปใ‚ซใƒฌใƒณใƒ€ใƒผๆคœ็ดข
ใใ‚‡ใ† ใƒฉใƒณใƒ€ใƒ 
HR 8799๏ผšๅคšๆƒ‘ๆ˜Ÿๆ’ๆ˜Ÿ็ณปใฎ็™บ่ฆ‹ HR 8799: Discovery of a Multi-planet Star System
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็งใŸใกใฎๅคช้™ฝ็ณปใฎใ‚ˆใ†ใชๆƒ‘ๆ˜Ÿ็ณปใฏใฉใ‚Œใใ‚‰ใ„ไธ€่ˆฌ็š„ใงใ—ใ‚‡ใ†ใ‹? 2008 ๅนดใพใงใฎ 12 ๅนด้–“ใงใ€่ฟ‘ใใฎๆ’ๆ˜Ÿใ‚’ๅ‘จๅ›žใ™ใ‚‹ 300 ใ‚’่ถ…ใˆใ‚‹ๅ€™่ฃœๆƒ‘ๆ˜Ÿ็ณปใŒ็™บ่ฆ‹ใ•ใ‚Œใพใ—ใŸใ€‚ใ—ใ‹ใ—ใ€็›ดๆŽฅ็”ปๅƒๅŒ–ใ•ใ‚ŒใŸใ‚‚ใฎใฏใชใใ€่ค‡ๆ•ฐใฎๆƒ‘ๆ˜Ÿใฎ่จผๆ‹ ใ‚’็คบใ—ใŸใ‚‚ใฎใฏๅฐ‘ใชใใ€ๅคšใใฏๆฐดๆ˜Ÿใฎ่ปŒ้“ใฎๅ†…ๅดใ‚’ๆœจๆ˜Ÿใ‚ตใ‚คใ‚บใฎๆƒ‘ๆ˜ŸใŒๅ‘จๅ›žใ—ใฆใ„ใพใ—ใŸใ€‚ใ—ใ‹ใ—ๅ…ˆ้€ฑใ€ใƒ•ใ‚ฉใƒผใƒžใƒซใƒใ‚ฆใƒˆ b ใฎๆœ€่ฟ‘ใฎ็”ปๅƒใจใจใ‚‚ใซใ€้ ใใฎๅคช้™ฝใซไผผใŸๆ’ๆ˜Ÿใ‚’ๅ‘จๅ›žใ™ใ‚‹ๆƒ‘ๆ˜Ÿใฎๆœ€ๅˆใฎ็ขบ่ช็”ปๅƒใฎไธ€ใคใ‚’็คบใ™ไธŠ่จ˜ใฎ็”ปๅƒใŒๅ…ฌ้–‹ใ•ใ‚Œใพใ—ใŸใ€‚HR 8799 ใฏใ€็งใŸใกใฎๅคช้™ฝใฎ็ด„ 1.5 ๅ€ใฎ่ณช้‡ใ‚’ๆŒใกใ€ๅคช้™ฝใ‹ใ‚‰็ด„ 130 ๅ…‰ๅนด้›ขใ‚Œใฆใ„ใพใ™ใ€‚ใ“ใ‚Œใฏใ€ๅคœ็ฉบใงๅฎนๆ˜“ใซ่ฆ‹ใˆใ‚‹ๅคšใใฎๆ’ๆ˜ŸใจใปใผๅŒใ˜่ท้›ขใงใ™ใ€‚ไธŠใฎ็”ปๅƒใฏใ€ใƒใƒฏใ‚คใฎ 10 ใƒกใƒผใƒˆใƒซ ใ‚ฑใƒƒใ‚ฏๆœ›้ ้กใŒ่ตคๅค–็ทšใงๆ’ฎๅฝฑใ—ใŸใ‚‚ใฎใงใ€ไบบๅทฅ็š„ใซ้ฎใ‚‰ใ‚ŒใŸไธญๅฟƒๆ˜Ÿใ‚’ๅ‘จๅ›žใ™ใ‚‹ 3 ใคใฎๆƒ‘ๆ˜ŸใŒๅ†™ใฃใฆใ„ใพใ™ใ€‚8 ใƒกใƒผใƒˆใƒซ ใ‚ธใ‚งใƒŸใƒ‹ๅŒ—ๆœ›้ ้กใ‚‚ๅŒๆง˜ใฎ็”ปๅƒใ‚’ๆ’ฎๅฝฑใ—ใพใ—ใŸใ€‚ใใ‚Œใžใ‚Œใฎๆƒ‘ๆ˜Ÿใฏๆœจๆ˜Ÿใฎๆ•ฐๅ€ใฎ่ณช้‡ใ‚’ๆŒใคใจ่€ƒใˆใ‚‰ใ‚Œใฆใ„ใ‚‹ใŒใ€ๆœ€ใ‚‚ๅ†…ๅดใฎๆƒ‘ๆ˜Ÿ๏ผˆdใจใƒฉใƒ™ใƒซไป˜ใ‘ใ•ใ‚Œใฆใ„ใ‚‹๏ผ‰ใงใ•ใˆใ€่ปŒ้“ๅŠๅพ„ใฏๅคช้™ฝใจๆตท็Ž‹ๆ˜Ÿใฎ่ท้›ขใซใปใผๅŒนๆ•ตใ™ใ‚‹ใ€‚HR 8799ๆƒ‘ๆ˜Ÿ็ณปใฏๆˆ‘ใ€…ใฎๅคช้™ฝ็ณปใจใฏๅคงใใ็•ฐใชใ‚‹ใ‚‚ใฎใฎใ€่ค‡้›‘ใชๆƒ‘ๆ˜Ÿ็ณปใŒๅญ˜ๅœจใ—ใ€ๅœฐ็ƒๅž‹ๆƒ‘ๆ˜ŸใŒๅญ˜ๅœจใ™ใ‚‹ๅฏ่ƒฝๆ€งใ‚‚ๅๅˆ†ใซใ‚ใ‚‹ใ“ใจใ‚’ๆ˜Ž็ขบใซ็คบใ—ใฆใ„ใ‚‹ใ€‚
ๅŽŸๆ–‡๏ผˆEnglish๏ผ‰
How common are planetary systems like our own Solar System? In the twelve years previous to 2008, over 300 candidate planetary systems have been found orbiting nearby stars. None, however, were directly imaged, few showed evidence for multiple planets, and many had a Jupiter-sized planet orbiting inside the orbit of Mercury. Last week, however, together with recent images of Fomalhaut b, the above picture was released showing one of first confirmed images of planets orbiting a distant Sun-like star. HR 8799 has a mass about 1.5 times that of our own Sun, and lies about 130 light years from the Sun -- a distance similar to many stars easily visible in the night sky. Pictured above, a 10-meter Keck telescope in Hawaii captured in infrared light three planets orbiting an artificially obscured central star. The 8-meter Gemini North telescope captured a similar image. Each planet likely contains several times the mass of Jupiter, but even the innermost planet, labelled d, has an orbital radius near the equivalent of the Sun- Neptune distance. Although the HR 8799 planetary system has significant differences with our Solar System, it is a clear demonstration that complex planetary systems exist, systems that could conceivable contain an Earth-like planet.

๏ผผ ใ“ใฎๆ„Ÿๅ‹•ใ‚’ๅฎ‡ๅฎ™ไปฒ้–“ใซใ‚ทใ‚งใ‚ข ๏ผ

ๅฎ‡ๅฎ™ใ‚’Xใงใ‚ทใ‚งใ‚ข
ยฉ NASA / APOD