The first SETI observations with the Allen telescope array

Tarter, Jill; Ackermann, Robert; Barott, William C.; Backus, P. R.; Davis, Michael; Dreher, J. W.; Harp, G. R.; Jordan, Jane; Kilsdonk, Tom; Shostak, Seth; Smolek, Ken

doi:10.1016/j.actaastro.2009.08.014

Cited by 22 publications

(17 citation statements)

References 3 publications

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“…End Frequencies observed (MHz) Narrowband Two types of radio instrumentation were used to examine the stellar system for signals. SonATA (SETI on the ATA) performed a fully automated, near-real-time spectral analysis of the star, following up immediately on detected candidate signals (see Tarter et al 2011). SonATA was sensitive to narrowband emissions of widths between 0.01 and 100 Hz.…”

Section: Beginningmentioning

confidence: 99%

Radio Seti Observations of the Anomalous Star Kic 8462852

Harp

Richards

Shostak

et al. 2016

ApJ

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Section: Beginningmentioning

confidence: 99%

Radio Seti Observations of the Anomalous Star Kic 8462852

Harp

Richards

Shostak

et al. 2016

ApJ

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“…Cocconi & Morrison 1959;Drake 1961;Horowitz & Sagan (1993) ;Tarter 2001;Howard et al 2007;Hanna et al 2009;Siemion et al 2013;Wright et al 2014a;Wright et al 2016;Lacki 2016)). Searches have been conducted at radio wavelengths with Arecibo, Green Bank telescope, Parkes radio telescope, and the Allen telescope array (Drake 1961;Werthimer et al 2001;Korpela et al 2011;Siemion et al 2013, Tarter et al 2011, and Harp et al 2015. These searches targeted both stars and galaxies, and more recently stars harboring known exoplanets (Siemion et al 2013).…”

Section: Introductionmentioning

confidence: 99%

A Search for Laser Emission with Megawatt Thresholds from 5600 FGKM Stars

Tellis¹,

Marcy²

2017

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We searched high resolution spectra of 5600 nearby stars for emission lines that are both inconsistent with a natural origin and unresolved spatially, as would be expected from extraterrestrial optical lasers.The spectra were obtained with the Keck 10-meter telescope, including light coming from within 0.5 arcsec of the star, corresponding typically to within a few to tens of au of the star, and covering nearly the entire visible wavelength range from 3640 to 7890 Å. We establish detection thresholds by injecting synthetic laser emission lines into our spectra and blindly analyzing them for detections. We compute flux density detection thresholds for all wavelengths and spectral types sampled. Our detection thresholds for the power of the lasers themselves range from 3 kW to 13 MW, independent of distance to the star but dependent on the competing "glare" of the spectral energy distribution of the star and on the wavelength of the laser light, launched from a benchmark, diffraction-limited 10-meter class telescope. We found no such laser emission coming from the planetary region around any of the 5600 stars. As they contain roughly 2000 lukewarm, Earth-size planets, we rule out models of the Milky Way in which over 0.1% of warm, Earth-size planets harbor technological civilizations that, intentionally or not, are beaming optical lasers toward us. A next generation spectroscopic laser search will be done by the Breakthrough Listen initiative, targeting more stars, especially stellar types overlooked here including spectral types O, B, A, early F, late M, and brown dwarfs, and astrophysical exotica.

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“…The ATA's fully automated system for spectral analysis searched for narrowband emissions between 0.01 and 10 Hz wide, with real-time followup of any candidate signals (Tarter et al 2011). Because the frequency of narrowband signals could change over time due to relative accelerations caused by diurnal rotation and orbital motions, the ATA's signal detection algorithms allow for detection of a fractional drift rate in frequency up to 10 -9 /sec (1 Hz/sec at 1 GHz to 10 Hz/sec at 10 GHz).…”

Section: Simultaneous Radio Observations and Resultsmentioning

confidence: 99%

Optical Seti Observations of the Anomalous Star Kic 8462852

Schuetz¹,

Vakoch²,

Shostak

et al. 2016

ApJL

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To explore the hypothesis that KIC 8462852's aperiodic dimming is caused by artificial megastructures in orbit (Wright et al. 2015), rather than a natural cause such as cometary fragments in a highly elliptical orbit (Marengo et al. 2015), we searched for electromagnetic signals from KIC 8462852 indicative of extraterrestrial intelligence. The primary observations were in the visible optical regime using the Boquete Optical SETI Observatory in Panama. In addition, as a preparatory exercise for the possible future detection of a candidate signal (Heidmann 1991), three of six observing runs simultaneously searched radio frequencies at the Allen Telescope Array in California. No periodic optical signals greater than 67 photons/m 2 within a time frame of 25 ns were seen. This limit corresponds to isotropic optical pulses of 8 10 22 joules. If, however, any inhabitants of KIC 8462852 were targeting our solar system (Shostak & Villard 2004), the required energy would be reduced greatly. The limits on narrowband radio signals were 180 -300 Jy Hz at 1 and 8 GHz, respectively, corresponding to a transmitter with an effective isotropic radiated power of 4 10 15 W (and 7 10 15 W) at the distance of KIC 8462852. While these powers requirements are high, even modest targeting could -just as for optical signals -lower these numbers substantially.

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The first SETI observations with the Allen telescope array

Cited by 22 publications

References 3 publications

Radio Seti Observations of the Anomalous Star Kic 8462852

Radio Seti Observations of the Anomalous Star Kic 8462852

A Search for Laser Emission with Megawatt Thresholds from 5600 FGKM Stars

Optical Seti Observations of the Anomalous Star Kic 8462852

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