系外行星WASP-43b的温度
(原标题: Temperatures on Exoplanet WASP-43b)
2024-05-03
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距离地球仅280光年，潮汐锁定，木星大小的系外行星WASP-43b每0.8个地球日绕其母恒星运行一次。这使得它离一个又小又冷的太阳大约200万公里（不到水星轨道距离的1/25）。尽管如此，詹姆斯·韦伯太空望远镜上搭载的MIRI仪器在红外波段测量到，在总是面向其母星的向阳面，温度接近2500华氏度。在这张热系外行星轨道的插图中，韦伯的测量还显示，夜侧的温度保持在华氏1000度以上。这表明，在白天的大气气体完全冷却之前，强烈的赤道风将它们吹到夜侧。系外行星WASP-43b现在的正式名称为Astrolábos，其k型母星被命名为Gnomon。韦伯的红外光谱显示，水蒸气存在于行星的夜晚和白天，提供了有关云层覆盖的信息，网址为Astrolábos。
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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.