AI 中文总结
赫菲斯托斯计划利用JWST/MIRI对两颗M矮星（戴森球候选者D和E）观测，发现其红外过量源于背景星系，明确了候选者D背景星系红移约0.9为Hot DOG，候选者E背景星系红移约0.4呈尘埃星暴形态，纠正了此前WISE数据的混淆。
AI 中文摘要
我们报告了詹姆斯·韦布空间望远镜中红外成像仪（JWST/MIRI）对两颗M矮星的成像和光谱观测结果。这两颗M矮星先前被赫菲斯托斯计划挑选为潜在的戴森球候选者（候选者D和E），因其在中红外波长存在过量辐射。我们发现红外过量并非源自戴森巨型结构或靠近这些恒星的其他辐射机制，而是来自在M矮星约1弧秒范围内投影的背景星系，这导致之前用广域红外巡天探测器（WISE）望远镜获得的中红外测光数据产生混淆。候选者D的背景星系红移约为0.9，在成像中呈点源主导，其红外光谱与热尘埃遮蔽星系（Hot DOG）一致。候选者E的背景星系红移约为0.4，呈现出带有亮结的扩展形态，光谱与尘埃星暴一致。
英文摘要
We report on JWST/MIRI imaging and spectroscopy of two M-dwarf stars previously singled out by project Hephaistos as potential Dyson-sphere candidates (their candidates D and E) due to the presence of excess flux at mid-infrared wavelengths. We find that the infrared excess does not originate from Dysonian megastructures, or other radiation mechanisms close to these stars, but from background galaxies projected within $\sim 1$ arcsec of the M dwarfs, thereby confusing previous mid-infrared photometry obtained with the WISE telescope. The candidate D background galaxy lies at redshift $z\approx 0.9$, appears point-source dominated in imaging and has a mid-infrared spectrum consistent with being a Hot Dust Obscured Galaxy (Hot DOG). The candidate E background galaxy lies at $z\approx 0.4$, displays an extended morphology with bright knots and a spectrum consistent with a dusty starburst.
Comments13 pages, 9 figures
