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J/AJ/152/181      SETI observations of exoplanets with the ATA     (Harp+, 2016)

SETI observations of exoplanets with the Allen Telescope Array. Harp G.R., Richards J., Tarter J.C., Dreher J., Jordan J., Shostak S., Smolek K., Kilsdonk T., Wilcox B.R., Wimberly M.K.R., Ross J., Barott W.C., Ackermann R.F., Blair S. <Astron. J., 152, 181-181 (2016)> =2016AJ....152..181H (SIMBAD/NED BibCode)
ADC_Keywords: Planets ; Stars, double and multiple ; Stars, nearby ; Interferometry Keywords: astrobiology - extraterrestrial intelligence - instrumentation: interferometers - planetary systems - planets and satellites: terrestrial planets - radio lines: planetary systems Abstract: We report radio SETI observations on a large number of known exoplanets and other nearby star systems using the Allen Telescope Array (ATA). Observations were made over about 19000hr from 2009 May to 2015 December. This search focused on narrowband radio signals from a set totaling 9293 stars, including 2015 exoplanet stars and Kepler objects of interest and an additional 65 whose planets may be close to their habitable zones. The ATA observations were made using multiple synthesized beams and an anticoincidence filter to help identify terrestrial radio interference. Stars were observed over frequencies from 1 to 9GHz in multiple bands that avoid strong terrestrial communication frequencies. Data were processed in near-real time for narrowband (0.7-100Hz) continuous and pulsed signals with transmitter/receiver relative accelerations from -0.3 to 0.3m/s2. A total of 1.9x108 unique signals requiring immediate follow-up were detected in observations covering more than 8x106 star-MHz. We detected no persistent signals from extraterrestrial technology exceeding our frequency-dependent sensitivity threshold of 180-310x10-26W/m2. Description: We report radio Search for ExtraTerrestrial Intelligence (SETI) observations on a large number of known exoplanets and other nearby star systems using the Allen Telescope Array (ATA). The ATA is an LNSD array (Large Number, Small Diameter, or Large Number of Small Dishes) consisting of 42 dishes with 6.1m diameter placed within an area approximately 300 by 150m on the ground. A 6.1m dish has a half-power beam width of 3.5° divided by the observing frequency in GHz. This is the maximum possible field of view of the array. Observations were made over about 19000hr from 2009 May to 2015 December, completing a total of 210000 separate observations in 20-40MHz blocks on 9293 stars covering a total of 7.3 million star MHz at selected frequencies between 1 and 9GHz. The set of 9293 stars includes 2015 exoplanet stars and Kepler objects of interest and an additional 65 whose planets may be close to their habitable zones. Table6 lists the various targets that at one time or another were listed in the habitable zone catalog, along with the percentage of the 1-9GHz available bandwidth over which each was measured. All the other observation targets in this campaign is found in Table7. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table6.dat 33 65 *List of all targets having exoplanets near their habitable zone table7.dat 46 9224 List of all targets where at least a 100MHz bandwidth was observed, not including habitable zone targets of table6
Note on table6.dat: The table does not show the percentages of the 1-9GHz bandwidth and the frequencies of observation because they are all 100% and 9000MHz, respectively.
See also: I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007) I/259 : The Tycho-2 Catalogue (Hog+ 2000) I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 5 F5.2 h RAhour Right Ascension in decimal hours (J2000) 6- 11 F6.2 deg DEdeg Declination in decimal degrees (J2000) 13- 33 A21 --- Name Target name(s)
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1 A1 --- S [HKT] Sample code (K=Kepler star, H=HabCat star, or T=Tycho Backup star) 3- 7 F5.2 h RAhour Right Ascension in decimal hours (J2000) 9- 14 F6.2 deg DEdeg Declination in decimal degrees (J2000) 16- 37 A22 --- Name Target name 39- 41 I3 % Percent [1/100] Completeness (percentage of 1-9GHz range that was searched) 43- 46 I4 MHz BW [100/9000] Total searched frequency bandwidth
History: From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 08-Mar-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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