期刊
ASTROBIOLOGY
卷 12, 期 4, 页码 290-294出版社
MARY ANN LIEBERT INC
DOI: 10.1089/ast.2011.0758
关键词
Astrobiology; SETI; Kuiper belt objects; Artificial illumination
资金
- NSF [AST-0907890]
- NASA [NNX08AL43G, NNA09D-B30A]
- Princeton University
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
Existing and planned optical telescopes and surveys can detect artificially illuminated objects, comparable in total brightness to a major terrestrial city, at the outskirts of the Solar System. Orbital parameters of Kuiper belt objects (KBOs) are routinely measured to exquisite precisions of <10(-3). Here, we propose to measure the variation of the observed flux F from such objects as a function of their changing orbital distances D. Sunlight-illuminated objects will show a logarithmic slope alpha equivalent to (d log F/d log D)= -4, whereas artificially illuminated objects should exhibit alpha = -2. The proposed Large Synoptic Survey Telescope (LSST) and other planned surveys will provide superb data and allow measurement of alpha for thousands of KBOs. If objects with alpha = -2 are found, follow-up observations could measure their spectra to determine whether they are illuminated by artificial lighting. The search can be extended beyond the Solar System with future generations of telescopes on the ground and in space that would have the capacity to detect phase modulation due to very strong artificial illumination on the nightside of planets as they orbit their parent stars.
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