系外行星 WASP- 43 b 的溫度
Temperatures on Exoplanet WASP-43b

發表日期:2024-05-03
在距離地球僅 280 光年的地方,一顆潮汐鎖定的木星大小的系外行星 WASP- 43 b 每 0 . 8 個地球日繞其母星執行一次。這使得它距離一個小而涼爽的太陽大約有 200 萬公里(不到水星軌道距離的 1 / 25 )。儘管如此,在始終面向母恆星的日面上,溫度接近 2500 華氏度,這是詹姆斯-韋伯太空望遠鏡上的 MIRI 儀器用紅外線波長測得的。在這幅系外行星的高溫軌道圖中,韋伯望遠鏡的測量結果還顯示,夜側的溫度仍保持在華氏 1000 度以上。這表明,強大的赤道風會在白天的大氣氣體完全冷卻之前將它們迴圈到夜側。系外行星WASP- 43 b 現在被正式命名為 "Astrolábos",它的K 型母星被命名為 "Gnomon"。韋伯的紅外光譜顯示,這顆行星的夜間和白天都存在水蒸氣,從而提供了有關阿斯特羅拉博斯雲層的資訊。
原文:A mere 280 light-years from Earth, tidally locked, Jupiter-sized exoplanet WASP-43b orbits its parent star once every 0.8 Earth days. That puts it about 2 million kilometers (less than 1/25th the orbital distance of Mercury) from a small, cool sun. Still, on a dayside always facing its parent star, temperatures approach a torrid 2,500 degrees F as measured at infrared wavelengths by the MIRI instrument on board the James Webb Space Telescope. In this illustration of the hot exoplanet's orbit, Webb measurements also show nightside temperatures remain above 1,000 degrees F. That suggests that strong equatorial winds circulate the dayside atmospheric gases to the nightside before they can completely cool off. Exoplanet WASP-43b is now formally known as Astrolábos, and its K-type parent star has been christened Gnomon. Webb's infrared spectra indicate water vapor is present on the nightside as well as the dayside of the planet, providing information about cloud cover on Astrolábos.
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