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    The First Very Long Baseline Interferometric Seti Experiment

    Access Status
    Open access via publisher
    Authors
    Rampadarath, Hayden
    Morgan, John
    Tingay, Steven
    Trott, Cathryn
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Rampadarath, Hayden and Morgan, John and Tingay, Steven and Trott, Cathryn. 2012. The First Very Long Baseline Interferometric Seti Experiment. The Astronomical Journal 144 (2).
    Source Title
    The Astronomical Journal
    DOI
    10.1088/0004-6256/144/2/38
    ISSN
    0004-6256
    URI
    http://hdl.handle.net/20.500.11937/11955
    Collection
    • Curtin Research Publications
    Abstract

    The first Search for Extra-Terrestrial Intelligence (SETI) conducted with very long baseline interferometry (VLBI) is presented. By consideration of the basic principles of interferometry, we show that VLBI is efficient at discriminating between SETI signals and human generated radio frequency interference (RFI). The target for this study was the star Gliese 581, thought to have two planets within its habitable zone. On 2007 June 19, Gliese 581 was observed for 8 hr at 1230-1544 MHz with the Australian Long Baseline Array. The data set was searched for signals appearing on all interferometer baselines above five times the noise limit. A total of 222 potential SETI signals were detected and by using automated data analysis techniques were ruled out as originating from the Gliese 581 system. From our results we place an upper limit of 7 MW Hz–1 on the power output of any isotropic emitter located in the Gliese 581 system within this frequency range. This study shows that VLBI is ideal for targeted SETI including follow-up observations. The techniques presented are equally applicable to next-generation interferometers, such as the long baselines of the Square Kilometre Array.

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