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An interferometric ...
An interferometric SETI observation of Kepler-111 b
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- Wandia, Kelvin (författare)
- University of Manchester
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- Garrett, M. A. (författare)
- University of Manchester,Universiteit Leiden (UL),Leiden University (UL)
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- Radcliffe, Jack F. (författare)
- University of Manchester,Universiteit van Pretoria,University of Pretoria
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- Garrington, Simon T. (författare)
- University of Manchester
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- Fawcett, James (författare)
- University of Manchester
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- Gajjar, Vishal (författare)
- University of California
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- MacMahon, D. (författare)
- University of California
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- Varenius, Eskil, 1986 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Campbell, R. M. (författare)
- Joint Institute for VLBI in Europe (JIVE)
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- Paragi, Z. (författare)
- Joint Institute for VLBI in Europe (JIVE)
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- Siemion, A. (författare)
- University of California,SETI Institute,University of Malta,University of Manchester
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(creator_code:org_t)
- 2023
- 2023
- Engelska.
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Ingår i: Monthly Notices of the Royal Astronomical Society. - 0035-8711 .- 1365-2966. ; 522:3, s. 3784-3794
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https://research.cha... (primary) (free)
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The application of very long baseline interferometry (VLBI) to the search for extraterrestrial intelligence (SETI) has been limited to date, despite the technique offering many advantages over traditional single-dish SETI observations. In order to further develop interferometry for SETI, we used the European VLBI network (EVN) at 21 cm to observe potential secondary phase calibrators in the Kepler field. Unfortunately, no secondary calibrators were detected. However, a VLBA primary calibrator in the field, J1926+4441, offset only ∼1.88 arcmin from a nearby exoplanet Kepler-111 b, was correlated with high temporal (0.25 s) and spectral (16384 × 488 Hz channels) resolution. During the analysis of the high-resolution data, we identified a spectral feature that was present in both the auto and cross-correlation data with a central frequency of 1420.424 ± 0.0002 MHz and a width of 0.25 MHz. We demonstrate that the feature in the cross-correlations is an artefact in the data, associated with a significant increase in each telescope's noise figure due to the presence of H I in the beam. This would typically go unnoticed in data correlated with standard spectral resolution. We flag (excluded from the subsequent analysis) these channels and phase rotate the data to the location of Kepler-111 b aided by the Gaia catalogue and search for signals with SNR > 7. At the time of our observations, we detect no transmitters with an equivalent isotropically radiated power ≳4 × 1015 W.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- proper motions
- radio continuum: general
- radio lines: general
- instrumentation: interferometers
- extraterrestrial intelligence
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Wandia, Kelvin
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Garrett, M. A.
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Radcliffe, Jack ...
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Garrington, Simo ...
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Fawcett, James
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Gajjar, Vishal
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visa fler...
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MacMahon, D.
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Varenius, Eskil, ...
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Campbell, R. M.
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Paragi, Z.
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Siemion, A.
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