赫芬顿一号工程Milky Way中部分Dyson球的上限
Project Hephaistos I. Upper limits on partial Dyson spheres in the Milky Way
摘要：
戴森球是由先进的外星文明建造的假想巨型结构，用于收集恒星的辐射能量。在这里，我们将来自Gaia DR 2的光学数据与AllWISE的中红外数据相结合，根据预期的废热特征，设定了迄今为止银河系内部分戴森球流行的最强上限。保守的上限是在G $\leq$ 21的恒星的比例，可能会潜在的主机非反射戴森球吸收1 - 90 $\%$的热光度的主机恒星和发射热废热在100 - 1000 K的范围。基于100 pc以内的$\approx$ $2.7\mathrm{e}\,5$恒星样本，我们发现小于$\approx$ $2\mathrm{e}\,-5$的一部分可能在90 $\%$完成时拥有$\sim$ 300 K戴森球。对于不太完整的戴森球，由于与自然发生的强中红外辐射源的混淆增加，这些限制逐渐变弱，并且由于WISE的检测限制，在更大的距离上也是如此。对于我们银河系样本中5 kpc以内的$\sim2.9\mathrm{e}\,8$恒星，在90 $\%$完成时，可能是$\sim$ 300 K戴森球的恒星比例的相应上限是$\leq$ $8\mathrm{e}\,-4$。
英文摘要：
Dyson spheres are hypothetical megastructures built by advanced extraterrestrial civilizations to harvest radiation energy from stars. Here, we combine optical data from Gaia DR2 with mid-infrared data from AllWISE to set the strongest upper limits to date on the prevalence of partial Dyson spheres within the Milky Way, based on their expected waste-heat signatures. Conservative upper limits are presented on the fraction of stars at G $\leq$ 21 that may potentially host non-reflective Dyson spheres that absorb 1 - 90$\%$ of the bolometric luminosity of their host stars and emit thermal waste-heat in the 100 - 1000 K range. Based on a sample of $\approx$ $2.7\mathrm{e}\,5$ stars within 100 pc, we find that a fraction less than $\approx$ $2\mathrm{e}\,-5$ could potentially host $\sim$300 K Dyson spheres at 90$\%$ completion. These limits become progressively weaker for less complete Dyson spheres due to increased confusion with naturally occurring sources of strong mid-infrared radiation, and also at larger distances, due to the detection limits of WISE. For the $\sim2.9\mathrm{e}\,8$ stars within 5 kpc in our Milky Way sample, the corresponding upper limit on the fraction of stars that could potentially be $\sim$300 K Dyson spheres at 90$\%$ completion is $\leq$ $8\mathrm{e}\,-4$.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
