Our Sky now and then $-$ searches for lost stars and impossible effects as probes of advanced extra-terrestrial civilisations

Abstract

Searches for extra-terrestrial intelligence (SETI) using large survey data often look for possible signatures of astroengineering. We propose to search for physically impossible effects caused by highly advanced technology, by carrying out a search for disappearing galaxies and Milky Way stars. We select $\sim$ 10 million objects from USNO-B1.0 with low proper motion ($\mu$ $<$ 20 milli arcseconds / year) imaged on the sky in two epochs. We search for objects not found at the expected positions in the Sloan Digital Sky Survey (SDSS) by visually examining images of $\sim$ 290 000 USNO-B1.0 objects with no counterpart in the SDSS. We identify some spurious targets in the USNO-B1.0. We find one candidate of interest for follow-up photometry, although it is very uncertain. If the candidate eventually is found, it defines the probability of observing a disappearing-object event the last decade to less than one in one million in the given samples. Nevertheless, since the complete USNO-B1.0 dataset is 100 times larger than any of our samples, we propose an easily accessible citizen science project in search of USNO-B1.0 objects which have disappeared from the SDSS.

arXiv commentAccepted to the Astronomical Journal

References in corpus (15)

• The Sloan Digital Sky Survey: Technical Summary
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The USNO-B Catalog
• Planet Hunters X. KIC 8462852 - Where's the Flux?
• A Survey About Nothing: Monitoring a Million Supergiants for Failed Supernovae
• The Search for Failed Supernovae with The Large Binocular Telescope: First Candidates
• The Ĝ Infrared Search for Extraterrestrial Civilizations with Large Energy Supplies. III. The Reddest Extended Sources in WISE
• The Ĝ Infrared Search for Extraterrestrial Civilizations with Large Energy Supplies. I. Background and Justification
• The Ĝ Infrared Search for Extraterrestrial Civilizations with Large Energy Supplies. II. Framework, Strategy, and First Result
• Extragalactic SETI: The Tully-Fisher relation as a probe of Dysonian astroengineering in disk galaxies
• Gone without a bang: An archival HST survey for disappearing massive stars
• The different neighbours around Type-1 and Type-2 active galactic nuclei
• Cleaning the USNO-B Catalog through automatic detection of optical artifacts
• Discovery of an unusual bright eclipsing binary with the longest known period: TYC 2505-672-1 / MASTER OT J095310.04+335352.8
• On the visible size and geometry of aggressively expanding civilizations at cosmological distances

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• Discovering vanishing objects in POSS I red images using the Virtual Observatory
• Sunscreen: Photometric Signatures of Galaxies Partially Cloaked in Dyson Spheres
• One of Everything: The Breakthrough Listen Exotica Catalog
• Galactic Traversability: A New Concept for Extragalactic SETI
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