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VERSION:2.0
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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20180308T103000
DTEND;TZID=Atlantic/Canary:20180308T113000
UID:iactalks-1139
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1139
CREATED:2018-03-08T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Possible photometric signatures of moderately advanced civilization
 s: The Clarke exobelt
DESCRIPTION:Possible photometric signatures of moderately advanced civiliza
 tions: The Clarke exobelt\nDr. Hector Socas Navarro\n\nThis paper puts for
 ward a possible new indicator for the presence of moderately advanced civi
 lizations on transiting exoplanets. The idea is to examine the region of s
 pace around a planet where potential geostationary or geosynchronous satel
 lites would orbit (herafter, the Clarke exobelt). Civilizations with a hig
 h density of devices and/or space junk in that region, but otherwise simil
 ar to ours in terms of space technology (our working definition of “
 moderately advanced”), may leave a noticeable imprint on the light c
 urve of the parent star. The main contribution to such signature comes fro
 m the exobelt edge, where its opacity is maximum due to geometrical projec
 tion. Numerical simulations have been conducted for a variety of possible 
 scenarios. In some cases, a Clarke exobelt with a fraction alface-on opaci
 ty of ∼10^{-4} would be easily observable with existing instrumentatio
 n. Simulations of Clarke exobelts and natural rings are used to quantify h
 ow they can be distinguished by their light curve.\nTo appear in ApJ.
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