J/ApJ/767/94 1.1-1.9GHz SETI survey of KOIs. I. (Siemion+, 2013)
A 1.1-1.9 GHz SETI survey of the Kepler field.
I. A search for narrow-band emission from select targets.
Siemion A.P.V., Demorest P., Korpela E., Maddalena R.J., Werthimer D.,
Cobb J., Howard A.W., Langston G., Lebofsky M., Marcy G.W., Tarter J.
<Astrophys. J., 767, 94 (2013)>
=2013ApJ...767...94S 2013ApJ...767...94S
ADC_Keywords: Planets ; Radio continuum ; Surveys
Keywords: astrobiology; extraterrestrial intelligence; surveys ;
planets and satellites: detection; planets and satellites: general
Abstract:
We present a targeted search for narrow-band (<5Hz) drifting
sinusoidal radio emission from 86 stars in the Kepler field hosting
confirmed or candidate exoplanets. Radio emission less than 5Hz in
spectral extent is currently known to only arise from artificial
sources. The stars searched were chosen based on the properties of
their putative exoplanets, including stars hosting candidates with
380K>Teq>230K, stars with five or more detected candidates or stars
with a super-Earth (Rp<3R{earth}) in a >50 day orbit. Baseband
voltage data across the entire band between 1.1 and 1.9GHz were
recorded at the Robert C. Byrd Green Bank Telescope between 2011
February and April and subsequently searched offline. No signals of
extraterrestrial origin were found. We estimate that fewer than ∼1% of
transiting exoplanet systems host technological civilizations that are
radio loud in narrow-band emission between 1 and 2GHz at an equivalent
isotropically radiated power (EIRP) of ∼1.5x1021erg/s, approximately
eight times the peak EIRP of the Arecibo Planetary Radar, and we limit
the number of 1-2GHz narrow-band-radio-loud Kardashev type II
civilizations in the Milky Way to be <10-6/M☉. Here we
describe our observations, data reduction procedures and results.
Description:
SETI observations were performed during the period 2011 February-April
using the Robert C. Byrd Green Bank Telescope (GBT) L-band
(1.1-1.9GHz) receiver and the Green Bank Ultimate Pulsar Processor
(GUPPI) digital backend (P. Demorest et al. 2013ApJ...762...94D 2013ApJ...762...94D).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 76 165 *Kepler field targeted observations 2011-Feb/Apr
--------------------------------------------------------------------------------
Note on table3.dat: We exclude Band 1, as the band 1200-1330MHz was not
searched due to the presence of a bandpass filter used to mitigate
heavy aircraft radar interference contaminating this region.
--------------------------------------------------------------------------------
See also:
J/A+A/562/A108 : 150MHz emission from exoplanets (Sirothia+, 2014)
J/ApJ/736/19 : Kepler planetary candidates. II. (Borucki+, 2011)
J/ApJ/701/1922 : Radio interferometric planet search. I. (Bower+, 2009)
J/A+A/475/359 : Predicting radio fluxes of exoplanets (Griessmeier+, 2007)
J/ApJ/612/511 : Exoplanet radio emission (Lazio+, 2004)
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Name Planet candidate name (1)
13 A1 --- f_Name [i] i: object observed serendipitously with
a primary target (see text)
15- 17 I3 s T0 ? Total exposure time for 1.1-1.2GHz (Band 0)
19- 22 F4.2 0.75Jy S0 ? 1.1-1.2GHz peak flux density (2)
24- 26 I3 s T2 ? Total exposure time for 1.33-1.4GHz (Band 2)
28- 31 F4.2 0.75Jy S2 ? 1.3-1.4GHz peak flux density (2)
33- 35 I3 s T3 ? Total exposure time for 1.4-1.5GHz (Band 3)
37- 40 F4.2 0.75Jy S3 ? 1.4-1.5GHz peak flux density (2)
42- 44 I3 s T4 ? Total exposure time for 1.5-1.6GHz (Band 4)
46- 49 F4.2 0.75Jy S4 ? 1.5-1.6GHz peak flux density (2)
51- 53 I3 s T5 ? Total exposure time for 1.6-1.7GHz (Band 5)
55- 58 F4.2 0.75Jy S5 ? 1.6-1.7GHz peak flux density (2)
60- 62 I3 s T6 ? Total exposure time for 1.7-1.8GHz (Band 6)
64- 67 F4.2 0.75Jy S6 ? 1.7-1.8GHz peak flux density (2)
69- 71 I3 s T7 ? Total exposure time for 1.8-1.9GHz (Band 7)
73- 76 F4.2 0.75Jy S7 ? 1.8-1.9GHz peak flux density (2)
--------------------------------------------------------------------------------
Note (1): KOI 326, one of our original targets, has been omitted from the
table as its single identified planet candidate was determined to be a
false positive.
Note (2): Peak sensitivity quoted in 10-23erg/s/cm2 (10-26W/m2) i
for 0.75Hz channelization;
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 19-Nov-2014