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ウェッブ望遠鏡、わずか数時間で焼かれる巨大惑星をとらえる

Webb Catches a Giant Planet Getting Roasted—In Just a Few Hours

ジェイムズ・ウェッブ宇宙望遠鏡が、極端な楕円軌道を持つ巨大ガス惑星HD 80606bが恒星に最接近する瞬間を捉えた。わずか数時間で温度が約1,100度も急上昇する、宇宙の「灼熱の瞬間」とは。
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Have you ever stepped too close to an oven and felt your face heat up at once? Now imagine a whole planet doing that again and again. That planet is HD 80606 b. It is a gas giant about four times the mass of Jupiter, and it races around a Sun-like star on a wild 111-day orbit instead of staying at one steady distance. (science.nasa.gov)

Most hot Jupiters stay close to their stars all the time. HD 80606 b is different. For much of its trip, it is far away. Then it dives inward to about 0.03 AU at periastron, the closest point in its orbit. Earlier Webb observations with NIRSpec showed that as this happens, the planet’s spectrum changes from a simple heat glow to one with visible absorption from molecules such as carbon monoxide and methane. (arxiv.org)

Think of a person leaving an air-conditioned room and opening a bakery oven. In one moment, the heat changes everything. The air feels different. Your body reacts. In a way, Webb watched that same kind of moment on a giant planet. NASA says the new MIRI observations followed HD 80606 b before, during, and after periastron, and even caught a secondary eclipse when the planet passed behind its star. (science.nasa.gov)

But here is the real turn. The new Webb data suggest the heating was even stronger than scientists expected from older Spitzer results. NASA reports that the planet’s temperature rises by about 1,100 degrees Fahrenheit. Because the orbit is so extreme, scientists can watch changes in temperature and chemistry in just a few hours, not over many weeks. (science.nasa.gov)

So HD 80606 b is not only a planet that gets roasted. It is a moving lab. It reminds us that in space, weather can be violent, chemistry can shift fast, and one strange orbit can teach us how other worlds live through their own seasons. Maybe that is the most human part of this story: even far from Earth, timing changes everything. (science.nasa.gov)

by EigoBoxAI
作成:2026/06/18 18:02
レベル:中上級 (語彙目安:4000〜6000語)
タイプ:ポッドキャスト

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