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dc.contributor.authorForgan, Duncan H.
dc.identifier.citationForgan , D H 2018 , ' Exoplanet transits as the foundation of an interstellar communications network ' , International Journal of Astrobiology , vol. First View .
dc.identifier.otherPURE: 252596207
dc.identifier.otherPURE UUID: a6e57285-8957-4c80-9341-f9de8751f92d
dc.identifier.otherScopus: 85043378905
dc.identifier.otherWOS: 000468951900001
dc.descriptionThe author gratefully acknowledges support from the ECOGAL project, grant agreement 291227, funded by the European Research Council under ERC-2011-ADG, and the STFC grant ST/J001422/1.en
dc.description.abstractTwo fundamental problems for extraterrestrial intelligences (ETIs) attempting to establish interstellar communication are timing and energy consumption. Humanity's study of exoplanets via their transit across the host star highlights a means of solving both problems. An ETI ‘A’ can communicate with ETI ‘B’ if B is observing transiting planets in A's star system, either by building structures to produce artificial transits observable by B, or by emitting signals at B during transit, at significantly lower energy consumption than typical electromagnetic transmission schemes. This can produce a network of interconnected civilizations, establishing contact via observing each other's transits. Assuming that civilizations reside in a Galactic Habitable Zone (GHZ), I conduct Monte Carlo Realization simulations of the establishment and growth of this network, and analyse its properties in the context of graph theory. I find that at any instant, only a few civilizations are correctly aligned to communicate via transits. However, we should expect the true network to be cumulative, where a ‘handshake’ connection at any time guarantees connection in the future via e.g. electromagnetic signals. In all our simulations, the cumulative network connects all civilizations together in a complete network. If civilizations share knowledge of their network connections, the network can be fully complete on timescales of order a hundred thousand years. Once established, this network can connect any two civilizations either directly, or via intermediate civilizations, with a path much less than the dimensions of the GHZ.
dc.relation.ispartofInternational Journal of Astrobiologyen
dc.rights© Cambridge University Press 2018. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at
dc.subjectExoplanet transiten
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.subjectEcology, Evolution, Behavior and Systematicsen
dc.subjectPhysics and Astronomy (miscellaneous)en
dc.subjectSpace and Planetary Scienceen
dc.subjectEarth and Planetary Sciences (miscellaneous)en
dc.subjectSDG 7 - Affordable and Clean Energyen
dc.titleExoplanet transits as the foundation of an interstellar communications networken
dc.typeJournal articleen
dc.contributor.sponsorEuropean Research Councilen
dc.contributor.institutionUniversity of St Andrews. St Andrews Centre for Exoplanet Scienceen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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