Amiri preprint shows Dyson swarms around white dwarfs would occupy the 50 K region of the H-R diagram currently empty of known natural objects

The study calculates orbital radii of 0.05–0.3 AU for red dwarfs and a few million kilometers for white dwarfs, showing that the resulting infrared re-radiation would shift objects leftward on the Hertzsprung-Russell diagram by two orders of magnitude in temperature. Because bolometric luminosity remains unchanged, these megastructures would occupy the same vertical position as their host stars but at temperatures below any catalogued Y-dwarf. The analysis explicitly contrasts the expected absence of silicate dust features with the spectra of natural debris disks. JWST Cycle 2 and 3 M-dwarf exoplanet surveys already deliver 5–15 micron photometry and spectroscopy capable of detecting 50 K blackbody excesses at distances under 20 pc. These programs target the same stellar hosts Amiri identifies as optimal, yet their data-reduction pipelines flag cold companions only as background or exoplanet candidates. Re-analysis of existing NIRSpec and MIRI datasets for objects lacking expected atmospheric methane absorption could therefore yield the first quantitative upper limits on swarm occurrence. The hypothesis reframes SETI as a search for infrared anomalies rather than narrowband radio signals. If confirmed, it would require only modest reallocation of JWST time already allocated to nearby white-dwarf and ultracool-dwarf fields, bypassing the sensitivity limits that have constrained radio SETI for decades.