Possible Photometric Signatures of Moderately Advanced Civilizations: The Clarke Exobelt. Socas-Navarro, H. ArXiv e-prints, 1802:arXiv:1802.07723, February, 2018. Paper abstract bibtex This paper puts forward a possible new indicator for the presence of moderately advanced civilizations on transiting exoplanets. The idea is to examine the region of space around a planet where potential geostationary or geosynchronous satellites would orbit (herafter, the Clarke exobelt). Civilizations with a high density of devices and/or space junk in that region, but otherwise similar to ours in terms of space technology (our working definition of "moderately advanced"), may leave a noticeable imprint on the light curve of the parent star. The main contribution to such signature comes from the exobelt edge, where its opacity is maximum due to geometrical projection. Numerical simulations have been conducted for a variety of possible scenarios. In some cases, a Clarke exobelt with a fractional face-on opacity of \textasciitilde1E-4 would be easily observable with existing instrumentation. Simulations of Clarke exobelts and natural rings are used to quantify how they can be distinguished by their light curve.
@article{socas-navarro_possible_2018,
title = {Possible {Photometric} {Signatures} of {Moderately} {Advanced} {Civilizations}: {The} {Clarke} {Exobelt}},
volume = {1802},
shorttitle = {Possible {Photometric} {Signatures} of {Moderately} {Advanced} {Civilizations}},
url = {http://adsabs.harvard.edu/abs/2018arXiv180207723S},
abstract = {This paper puts forward a possible new indicator for the presence of
moderately advanced civilizations on transiting exoplanets. The idea is
to examine the region of space around a planet where potential
geostationary or geosynchronous satellites would orbit (herafter, the
Clarke exobelt). Civilizations with a high density of devices and/or
space junk in that region, but otherwise similar to ours in terms of
space technology (our working definition of "moderately advanced"), may
leave a noticeable imprint on the light curve of the parent star. The
main contribution to such signature comes from the exobelt edge, where
its opacity is maximum due to geometrical projection. Numerical
simulations have been conducted for a variety of possible scenarios. In
some cases, a Clarke exobelt with a fractional face-on opacity of {\textasciitilde}1E-4
would be easily observable with existing instrumentation. Simulations of
Clarke exobelts and natural rings are used to quantify how they can be
distinguished by their light curve.},
urldate = {2018-02-23},
journal = {ArXiv e-prints},
author = {Socas-Navarro, Hector},
month = feb,
year = {2018},
keywords = {Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics},
pages = {arXiv:1802.07723},
}
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