发表机构
University of Manchester; Uppsala University; University of Oxford; University of California, Berkeley; SETI Institute; University of Malta; The Pennsylvania State University（曼彻斯特大学; 乌普萨拉大学; 牛津大学; 加州大学伯克利分校; SETI研究所; 马耳他大学; 宾夕法尼亚州立大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
基于档案数据对九个赫菲斯托斯计划戴森球候选M矮星诊断检查，通过比较盖亚位置等办法，发现候选者B和C有显著背景污染，部分候选者有暗示性或边缘证据，部分无明显污染迹象，需专门观测消除误报。
AI 中文摘要
我们报告了基于档案数据对九个赫菲斯托斯计划戴森球候选M矮星的诊断检查。通过将传播到全天红外巡天扩展源（AllWISE）时代的盖亚位置与从AllWISE图像测量的中红外质心进行比较，以及深度档案光学/近红外成像，我们在候选者B和C中发现了显著的背景污染。候选者B与一个光谱指数α = 0.63 +/- 0.11的射电对应体重合，而候选者C有一个偏移量为3.75角秒的近红外伴星。候选者A通过一个光谱指数α = 0.40 +/- 0.35的射电对应体提供了暗示性证据，而候选者E、F、H和J显示出边缘证据。这些系统表现出显著的天体测量偏移或可见的闯入者，表明中红外过剩可能源于视线被热的、尘埃遮蔽星系的污染。然而，候选者D和I仍然缺乏明显的污染迹象。因此，专门的观测对于表征这些潜在的闯入者、消除误报以及确保技术特征搜索集中在最可靠的戴森球候选者上至关重要。
英文摘要
We report on the diagnostic investigation of nine Project Hephaistos Dyson Sphere candidate M-dwarfs based on archival data. By comparing the Gaia DR3 positions with epoch 2016.0, propagated to the AllWISE epoch, with the mid-infrared centroids measured from the AllWISE images, together with deep archival optical/near-infrared imaging, we identified significant background contamination in candidates B and C--candidate B coincident with a radio counterpart showing a power-law-like spectrum with a radio spectral index alpha = 0.63 +/- 0.11, while candidate C has a near-infrared companion at an offset of 3.75 arcsec. Candidate A provides suggestive evidence through a radio counterpart with spectral index alpha = 0.40 +/- 0.35, while candidates E, F, H and J show marginal evidence. These systems exhibit either significant astrometric offsets or visible interlopers, indicating that the mid-infrared excess likely arises from line-of-sight contamination by hot, dust-obscured galaxies. However, candidates D and I still lack obvious signs of contamination. Dedicated observations are therefore essential to characterise these potential interlopers, eliminate false positives, and ensure that technosignature searches focus on the most robust Dyson Sphere candidates.
Comments16 figures, 13 tables. Presented at IAUS 404: Advancing the Search for Technosignatures (March 2026). Accepted by the MNRAS
