Results 11 to 20 of about 362 (148)

Artificial Greenhouse Gases as Exoplanet Technosignatures [PDF]

The Astrophysical Journal
Atmospheric pollutants such as chlorofluorocarbons and NO _2 have been proposed as potential remotely detectable atmospheric technosignature gases. Here we investigate the potential for artificial greenhouse gases including CF _4 , C _2 F _6 , C _3 F _8 ,
Edward W. Schwieterman, Thomas J. Fauchez, Jacob Haqq-Misra, Ravi K. Kopparapu, Daniel Angerhausen, Daria Pidhorodetska, Michaela Leung, Evan L. Sneed, Elsa Ducrot   +8 more
doaj   +7 more sources

Results from NASA’s First Radio Telescope on the Moon: Terrestrial Technosignatures and the Low-frequency Galactic Background Observed by ROLSES-1 on Board the Odysseus Lander

The Astronomical Journal
Radio wave Observations on the Lunar Surface of the photo-Electron Sheath (ROLSES-1) instrument on board Intuitive Machines’ Odysseus lunar lander represents NASA’s first radio telescope on the Moon, and the first United States spacecraft landing on the ...
Joshua J. Hibbard, Jack O. Burns, Robert MacDowall, Natchimuthuk Gopalswamy, Scott A. Boardsen, William Farrell, Damon Bradley, Thomas M. Schulszas, Johnny Dorigo Jones, David Rapetti, Jake D. Turner   +10 more
doaj   +2 more sources

Radio Technosignature Searches of TESS Targets

, 2021
A practical method to perform a Search for Extraterrestrial Intelligence is to search the sky for extraterrestrial signals, also known as technosignatures. A technosignature search of many nearby systems is currently underway by the Breakthrough Listen Initiative.
Noah Franz, S. Croft
openalex   +2 more sources

Earth Detecting Earth: At What Distance Could Earth’s Constellation of Technosignatures Be Detected with Present-day Technology?

The Astronomical Journal
The field of Search for Extraterrestrial Intelligence (SETI) searches for “technosignatures” could provide the first detection of life beyond Earth through the technology that an extraterrestrial intelligence may have created.
Sofia Z. Sheikh, Macy J. Huston, Pinchen Fan, Jason T. Wright, Thomas Beatty, Connor Martini, Ravi Kopparapu, Adam Frank   +7 more
doaj   +2 more sources

Projections of Earth’s Technosphere: Strategies for Observing Technosignatures on Terrestrial Exoplanets

The Astrophysical Journal Letters
The search for technosignatures—remotely detectable evidence of extraterrestrial technology—draws upon examples from the recent history of Earth as well as projections of Earth’s technosphere.
Jacob Haqq-Misra, Ravi K. Kopparapu, George Profitiliotis   +2 more
doaj   +2 more sources

Detectability of Solar Panels as a Technosignature

The Astrophysical Journal
In this work, we assess the potential detectability of solar panels made of silicon on an Earth-like exoplanet as a potential technosignature. Silicon-based photovoltaic cells have high reflectance in the ultraviolet-to-visible (UV-VIS) and in the near ...
Ravi Kopparapu, Vincent Kofman, Jacob Haqq-Misra, Vivaswan Kopparapu, Manasvi Lingam   +4 more
doaj   +3 more sources

Technosignature Searches with Real-time Alert Brokers

The Astronomical Journal
We present an exploration of technosignature research that is possible using real-time alert brokers from surveys such as the Zwicky Transient Facility (ZTF) and the upcoming Legacy Survey of Space and Time (LSST).
Eleanor M. Gallay, James R. A. Davenport, Steve Croft   +2 more
doaj   +3 more sources

Polycyclic Aromatic Hydrocarbons as an Extraterrestrial Atmospheric Technosignature

The Planetary Science Journal
Polycyclic aromatic hydrocarbons (PAHs) are prevalent in the Universe and interstellar medium but are primarily attributed to anthropogenic sources on Earth, such as fossil fuel combustion and firewood burning.
Dwaipayan Dubey, Ravi Kopparapu, Barbara Ercolano, Karan Molaverdikhani   +3 more
doaj   +3 more sources

Anomaly Detection and Radio-frequency Interference Classification with Unsupervised Learning in Narrowband Radio Technosignature Searches [PDF]

The Astronomical Journal
The search for radio technosignatures is an anomaly detection problem: Candidate signals represent needles of interest in the proverbial haystack of radio-frequency interference (RFI). Current search frameworks find an enormity of false-positive signals,
Ben Jacobson-Bell, Steve Croft, Carmen Choza, Alex Andersson, Daniel Bautista, Vishal Gajjar, Matthew Lebofsky, David H. E. MacMahon, Caleb Painter, Andrew P. V. Siemion   +9 more
doaj   +2 more sources

A note on the Vukotić-Gordon mini-earths [PDF]

Serbian Astronomical Journal, 2023
A recent proposal for a new kind of astroengineering artifact due to Vukotić and Gordon (2022) is discussed, in particular in light of multiple benefits offered by the magnetic Penrose process.
Ćirković Milan M.
doaj   +1 more source