J/MNRAS/498/5720 Extended Breakthrough Listen sample (Wlodarczyk-Sroka+, 2020)
Extending the Breakthrough Listen nearby star survey to other stellar objects in
the field.
Wlodarczyk-Sroka B.S., Garrett M.A., Siemion A.P.V.
<Mon. Not. R. Astron. Soc. 498, 5720-5729 (2020)>
=2020MNRAS.498.5720W 2020MNRAS.498.5720W (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Proper motions ; Parallaxes, trigonometric ;
Stars, distances ; Radial velocities
Keywords: astronomical instrumentation - methods and techniques - astrometry -
stars: general - radio continuum: general
Abstract:
We extend the source sample recently observed by the Breakthrough
Listen Initiative by including additional stars (with parallaxes
measured by Gaia) that also reside within the FWHM of the GBT and
Parkes radio telescope target fields. These stars have estimated
distances as listed in the extensions of the Gaia DR2 catalogue.
Enlarging the sample from 1327 to 288315 stellar objects permits us to
achieve substantially better Continuous Waveform Transmitter Rate
Figures of Merit (CWTFM) than any previous analysis, and allows us to
place the tightest limits yet on the prevalence of nearby
high-duty-cycle extraterrestrial transmitters. The results suggest
≲0.0660(+0.0004,-0.0003)% of stellar systems within 50 pc host such
transmitters (assuming an EIRP≳1013W) and ≲0.039(+0.004,-0.008)%
within 200pc (assuming an EIRP≳2.5*1014W). We further extend
our analysis to much greater distances, though we caution that the
detection of narrow-band signals beyond a few hundred pc may be
affected by interstellar scintillation. The extended sample also
permits us to place new constraints on the prevalence of
extraterrestrial transmitters by stellar type and spectral class. Our
results suggest targeted analyses of SETI radio data can benefit from
taking into account the fact that in addition to the target at the
field centre, many other cosmic objects reside within the primary beam
response of a parabolic radio telescope. These include foreground and
background galactic stars, but also extragalactic systems. With
distances measured by Gaia, these additional sources can be used to
place improved limits on the prevalence of extraterrestrial
transmitters, and extend the analysis to a wide range of cosmic
objects.
Description:
Using the target sample of Price et al. (2020AJ....159...86P 2020AJ....159...86P), the
Gaia DR2 catalogue and its extensions were probed to compile a list of
stars contained within the fields of view studied by Price et al.
(2020AJ....159...86P 2020AJ....159...86P). 288315 unique sources were observed by the
three radio telescope receivers used (GBT L-band, GBT S-band and
Parkes 10-cm), across 356616 observations (210146 with the GBT at
L-band, 89654 with the GBT at S-band, and 56816 with Parkes). Minimum
detectable Equivalent Isotropic Radiated Power values are presented as
calculated from the source position in the beam (by applying a
Gaussian sensitivity function) and the source estimated distance taken
from Bailer-Jones et al. (2018AJ....156...58B 2018AJ....156...58B, Cat. I/347).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
catalog.dat 631 356616 Table of the 288315 stars included as part of our
extension of the original Breakthrough Listen
sample of Price et al. (2020AJ....159...86P 2020AJ....159...86P)
--------------------------------------------------------------------------------
See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
Byte-by-byte Description of file: catalog.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR2 Gaia DR2 unique source identifier
21- 42 F22.18 deg RAdeg Right ascension (ICRS) at Ep=2015.5
44- 64 F21.19 mas e_RAdeg Standard error of right ascension
66- 88 E23.19 deg DEdeg Declination (ICRS) at Ep=2015.5
90-109 F20.18 mas e_DEdeg Standard error of declination
111-133 E23.19 mas Plx Parallax
135-147 E13.9 --- RPlx Parallax divided by its error
149-170 E22.19 mas/yr pmRA Proper motion in right ascension
direction, pmRA*cosDE
172-191 F20.18 mas/yr e_pmRA Standard error of proper motion in
right ascension direction
193-214 E22.19 mas/yr pmDE Proper motion in declination direction
216-235 F20.18 mas/yr e_pmDE Standard error of proper motion in
declination direction
237-246 F10.7 mag Gmag G-band mean magnitude
248-260 E13.10 mag BP-RP ? BP-RP colour index
262-283 F22.17 km/s RV ? Radial velocity
285-304 F20.17 km/s e_RV ? Radial velocity error
306-314 F9.4 K Teff ? Source effective temperature
316-339 A24 --- Target Target designation
341-359 F19.15 deg RATdeg Target right ascension (ICRS) at
Ep=2015.5
361-378 F18.14 deg DETdeg Target declination (ICRS) at Ep=2015.5
380-387 F8.4 mas PlxT Target parallax
389-397 F9.3 mas/yr pmRAT Target proper motion in right ascension
direction, pmRA*cosDE
399-407 F9.3 mas/yr pmDET Target proper motion in declination
direction
409-416 F8.3 km/s RVT Target radial velocity
418-436 F19.14 pc rest Estimated distance (1)
438-456 F19.14 pc b_rest Lower bound on the confidence interval
of the estimated distance (1)
458-477 F20.14 pc B_rest Upper bound on the confidence interval
of the estimated distance (1)
479-497 F19.12 pc rlen Length scale used in the prior for the
distance estimation (1)
499-522 A24 --- InstT Telescopes used to observe the target
524-535 A12 --- InstS Telescope used to observe individual
source in a particular pointing
537-539 F3.1 arcmin FWHM Full-width at half-maximum of receiver
primary beam
541-561 E21.17 deg Offset-deg Total angular offset of source from
target
563-583 E21.17 arcmin Offset-arcmin Total angular offset of source from
target
585-602 F18.16 --- TelResGaus Sensitivity response of telescope at
offset (2)
604-625 E22.17 W min-detec-EIRP Minimum detectable Equivalent Isotropic
Radiated Power for source
627-631 A5 --- Price-target? [false/true ] In original target sample
of Price et al.
(2020AJ....159...86P 2020AJ....159...86P) ?(3)
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Note (1): Estimated distance values determined the catalogue presented by
Bailer-Jones et al. (2018AJ....156...58B 2018AJ....156...58B).
Note (2): Determined from a Gaussian fit to the angular offset of the source
from the pointing target.
Note (3): Flag as follows:
true = source featured in original target sample of
Price et al. (2020AJ....159...86P 2020AJ....159...86P)
false = source featured in extended sample presented in this paper.
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Acknowledgements:
Bart S. Wlodarczyk-Sroka, bart.wlodarczyk-sroka(at)postgrad.manchester.ac.uk
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(End) Patricia Vannier [CDS] 02-Sep-2020