The search for extrasolar planets (EXOPLANETS) is one of the most rapidly expanding fields in astrophysics. Thanks to recent space-based efforts the number of detected planets in extrasolar stellar systems has increased dramatically, and more than 900 objects have been identified as of today, see e.g. http://exoplanet.eu/catalog/. With candidates identified in the so-called habitable zone (HZ)1 the question of extraterrestrial life becomes very actual. Here we discuss ideas that could lead to infer the presence (or the past existence) of an extraterrestrial civilization by the detection of artifacts in orbit around the host planet.
The theoretical band around a star where a planet could orbit and host liquid water↩
This is an attempt to write an Authorea Open Science article. The author of the seed abstract (seed author) welcomes any collaborator willing to give comments / input on the topic discussed. For the time being people who want to be added as collaborators need to send an email request to the seed author (matteo at kitp.ucsb.edu). As the effort progress, the different contributions are logged in and stored in the Authorea version system, so that in the final version of the paper the contributions from the various authors can be viewed in detail and eventually a ranked author list produced. The final article will be published in Authorea (and possibly a high impact factor journal) and posted on AstroPh.