A Search for Technosignatures from 14 Planetary Systems in the Kepler Field with the Green Bank Telescope at 1.15–1.73 GHz

Margot, Jean-Luc; Greenberg, Adam; Pinchuk, Pavlo; Shinde, Akshay; Alladi, Yashaswi; Mn, Srinivas Prasad; Bowman, M. Oliver; Fisher, Callum; Gyalay, Szilard; McKibbin, Willow; Miles, Brittany; Nguyen, Donald; Power, C.; Ramani, Namrata; Raviprasad, Rashmi; Santana, Jesse; Lynch, R.

doi:10.3847/1538-3881/aabb03

Cited by 20 publications

(21 citation statements)

References 38 publications

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“…Recent SETI searches were also undertaken at the GBT by Margot et al (2018) and in follow-up work by Pinchuk et al (2019) (henceforth M&P). In both cases, the GBT L-band receiver was used, but different data analysis approaches were applied.…”

Section: Comparison To Other Recent Gbt Searchesmentioning

confidence: 99%

“…A very clear pulsar detection can be seen well across these limits. Margot et al (2018) and Pinchuk et al (2019) only analyzed data within the nominal 1.15-1.73 GHz passband of the receiver. Apart from elevated system temperature due to loss in aperture efficiency, we find no impediment to use of the full 1.10-1.90 GHz band, although we note that both BL and M&P avail themselves of the 1.20-1.34 GHz notch filter to suppress nearby air surveillance radar (see Figure 6).…”

Section: Observational Strategymentioning

confidence: 99%

“…5.6.3. Drift rates and S/N threshold Margot et al (2018) use a window of size ±ν max × t obs ≈ ±1500 Hz to remove redundant detections. Following Enriquez et al (2017), we use ±ν max ×t obs /2, i.e.…”

Section: -Bit Requantizationmentioning

confidence: 99%

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The Breakthrough Listen Search for Intelligent Life: Observations of 1327 Nearby Stars Over 1.10–3.45 GHz

et al. 2020

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Breakthrough Listen (BL) is a ten-year initiative to search for signatures of technologically capable life beyond Earth via radio and optical observations of the local Universe. A core part of the BL program is a comprehensive survey of 1702 nearby stars at radio wavelengths (1-10 GHz). Here, we report on observations with the 64-m CSIRO Parkes radio telescope in New South Wales, Australia, and the 100-m Robert C. Byrd Green Bank radio telescope in West Virginia, USA. Over 2016 January to 2019 March, a sample of 1138 stars was observed at Green Bank using the 1.10-1.90 GHz and 1.80-2.80 GHz receivers, and 189 stars were observed with Parkes over 2.60-3.45 GHz. We searched these data for the presence of engineered signals with Doppler-acceleration drift rates between ±4 Hz s −1 . Here, we detail our data analysis techniques and provide examples of detected events. After excluding events with characteristics consistent with terrestrial radio interference, we are left with zero candidates. That is, we find no evidence of putative radio transmitters above 2.1×10 12 W, and 9.1×10 12 W for Green Bank and Parkes observations, respectively. These observations constitute the most comprehensive search over 1.10-3.45 GHz for technosignatures to date. All data products, totalling ∼219 TB, are available for download as part of the first BL data release (DR1), as described in a companion paper (Lebofsky et. al., 2019)

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Section: Comparison To Other Recent Gbt Searchesmentioning

confidence: 99%

Section: Observational Strategymentioning

confidence: 99%

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The Breakthrough Listen Search for Intelligent Life: Observations of 1327 Nearby Stars Over 1.10–3.45 GHz

et al. 2020

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“…92 In 2018 a paper by Jean-Luc Margot et al detailed the results of 'A Search for Technosignatures from 14 Planetary Systems in the Kepler Field with the Green Bank Telescope at 1.15-1.73 GHz.' 93 Focusing on 14 planetary systems, 858,748 candidate narrowband radio signals were analysed from within c. 420 and c. 13000 light-years of Earth, producing a short-list of 19 candidate signals. However, 'All of these candidates were observed in more than one direction on the sky, thereby ruling them out as extraterrestrial signals.'…”

Section: An Accumulating Evidence Of Absent Aliensmentioning

confidence: 99%

Scientific rebuttals to ‘ancient aliens’ as popular alternatives to biblical history

Williams

2020

theo

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Just as Christian apologists need to rebut the ‘alternative’ historical claims of The Book of Mormon, so they need to rebut claims about so-called ‘ancient aliens’. These claims offer people with a secular worldview historical counter-narratives to biblical history that draw upon the scientific respectability of astrobiology and the search for extraterrestrial intelligence (SETI). Rather than interacting with the specifics of ‘ancient alien’ narratives on a case-by-case basis, I argue that ‘ancient alien’ theories are intrinsically convoluted and highly ad hoc, and that multiple essential facets of such theories are disconfirmed by scientific evidence. Not only do we lack convincing evidence that extraterrestrial intelligences have visited Earth, but SETI has provided observational evidence that suggests technologically advanced aliens simply don’t exist, at least in our cosmic neighborhood. In sum, when it comes to ‘ancient aliens’, it’s those who believe in ‘ancient aliens’, not Christians, who are swimming against the scientific evidence.

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“…The second concept is the technosignature (or technomarker). Margot et al (2018:2) provide a good definition of a technosignature as stated below.…”

Section: B Technosignaturesmentioning

confidence: 99%

Exo-Astrosociology and the Search for Technosignatures

Pass¹

2019

AIAA Scitech 2019 Forum

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The search for extraterrestrial societies on exoplanets, exomoons, and artificial structures has thus far proven unsuccessful. Nevertheless, astrosociology focuses on the human dimension of space exploration, which involves everything humanity discovers in space, and that includes nonhuman sentient life, which is the focus here. At this point in human history, the search itself is the focus by necessity as are all of the methodologies employed to increase the likelihood of such a discovery. Even if the eventual discovery of an extraterrestrial civilization is unlikely, astrosociologists, like astrobiologists and SETI scientists, must assume it is a likely outcome. Therefore, the efforts focusing on finding technosignatures are pursued. The connection between astrobiology and astrosociology lies in the basic idea that because Earth-based humans are actively searching for extraterrestrial life, it is therefore important to study how and why they participate in such activities as well as what would result if their searches discovered a nonhuman society. This essay focuses most heavily on technosignatures although other indications of life, such as biosignatures, are also relevant and thus receive some attention here. Thus, the detection of intelligent, technological life elsewhere in our universe does not fall only into the domains of astrobiology and SETI. There substantial issues that astrosociology, and more specifically the subfield of exoastrosociology, can best address. Nomenclature ARI = The Astrosociology Research Institute ET = extraterrestrial ETI = extraterrestrial intelligence ETIL = extraterrestrial intelligent life ETS = extraterrestrial society METI = Messaging to Extraterrestrial Intelligence NASA = National Aeronautics and Space Administration SETI = search for extraterrestrial intelligence STEM = science, technology, engineering, and mathematics STEAM = science, technology, engineering, mathematics, and the arts I. Introduction: The Difficulty of the Task XO-ASTROSOCIOLOGISTS are interested in life elsewhere in the cosmos, just like other scientists and scholars such as SETI researchers and astrobiologists as well as an untold number of those in the public sphere. Those who participate in the search itself continue to face a seemingly daunting task; namely, to detect a nonrelated genesis of life elsewhere in our universe. Paraphrasing Carl Sagan's character Ellie Arroway's statement that was famously articulated in the 1997 movie Contact: "the universe is an amazingly big place, so if it's just us, it seems like an awful waste of space." With this in mind, humanity continues the search. Not surprisingly, though, the most common type of question that arises coincides with the Fermi Paradox, which corresponds to the current failure to detect evidence of extraterrestrial biology or technology, asking: Where is everybody? Where are all the nonhuman intelligent species? Relatedly, are homo sapiens truly alone? Is life on Earth a fluke or does life exist elsewhere? Is it rare or abundant? These types of ...

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A Search for Technosignatures from 14 Planetary Systems in the Kepler Field with the Green Bank Telescope at 1.15–1.73 GHz

Cited by 20 publications

References 38 publications

The Breakthrough Listen Search for Intelligent Life: Observations of 1327 Nearby Stars Over 1.10–3.45 GHz

The Breakthrough Listen Search for Intelligent Life: Observations of 1327 Nearby Stars Over 1.10–3.45 GHz

Scientific rebuttals to ‘ancient aliens’ as popular alternatives to biblical history

Exo-Astrosociology and the Search for Technosignatures

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