J/AJ/161/55ivo://CDS.VizieR/J/AJ/161/55doi:10.26093/cds/vizier.51610055CDSMargot J.-L.Pinchuk P.Geil R.Alexander S.Arora S.Biswas S.,Cebreros J.Desai S.P.Duclos B.Dunne R.Lin Fu K.K.Goel S.,Gonzales J.Gonzalez A.Jain R.Lam A.Lewis B.Lewis R.Li G.,MacDougall M.Makarem C.Manan I.Molina E.Nagib C.Neville K.,O'Toole C.Rockwell V.Rokushima Y.Romanek G.Schmidgall C.Seth S.,Shah R.Shimane Y.Singhal M.Tokadjian A.Villafana L.Wang Z.YunInZhu L.Lynch R.S.2022-09-30T21:41:18Z2021-04-08T07:43:07ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frg-starsmilky-way-galaxyradio-sourcesexoplanetsstellar-spectral-typesvisible-astronomytrigonometric-parallaxWe conducted a search for technosignatures in 2018 and 2019 April with the L-band receiver (1.15-1.73GHz) of the 100m diameter Green Bank Telescope. These observations focused on regions surrounding 31 Sun-like stars near the plane of the Galaxy. We present the results of our search for narrowband signals in this data set, as well as improvements to our data processing pipeline. Specifically, we applied an improved candidate signal detection procedure that relies on the topographic prominence of the signal power, which nearly doubles the signal detection count of some previously analyzed data sets. We also improved the direction-of-origin filters that remove most radio frequency interference (RFI) to ensure that they uniquely link signals observed in separate scans. We performed a preliminary signal injection and recovery analysis to test the performance of our pipeline. We found that our pipeline recovers 93% of the injected signals over the usable frequency range of the receiver and 98% if we exclude regions with dense RFI. In this analysis, 99.73% of the recovered signals were correctly classified as technosignature candidates. Our improved data processing pipeline classified over 99.84% of the ~26million signals detected in our data as RFI. Of the remaining candidates, 4539 were detected outside of known RFI frequency regions. The remaining candidates were visually inspected and verified to be of anthropogenic nature. Our search compares favorably to other recent searches in terms of end-to-end sensitivity, frequency drift rate coverage, and signal detection count per unit bandwidth per unit integration time.2021AJ....161...55Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/161/55CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/simbad : Simbad objects catalogue (M.Wenger 2000)I/337 : Gaia DR1 (Gaia Collaboration, 2016)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/ApJS/207/35 : Kepler pipeline signal-to-noise studies (Christiansen+,2013)J/ApJ/767/94 : 1.1-1.9GHz SETI survey of KOIs. I. (Siemion+, 2013)J/AJ/152/181 : SETI observations of exoplanets with the ATA (Harp+, 2016)J/ApJ/869/66 : Search for extraterrestrial intelligence with ATA (Harp+, 2018)J/MNRAS/498/5720 : Extended Breakthrough Listen sample (Wlodarczyk-Sroka+,2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/161/55https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/161/55http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/161/55https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/161/55https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/161/55http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/161/55GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/161/55/table1 (*Target host stars listed in order of observation)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/161/55/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/161/55/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/161/55/table1?GETtext/xml+votable180.050000true89.344424.10050.0055555555555555566/22046-22047 22069 22077 22113 22121-22122 22209 23673 23675 23677 23679 23763 24325 24329 24333-24334 24344 24348 24356-24357https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/161/55?format=asciiOpticalRadiodefaultJ/AJ/161/55/table1*Target host stars listed in order of observation_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameTarget namemeta.id;meta.maincharprimaryf_Name[a] Flag on Name (1)meta.codecharSpTSpectral Typesrc.spTypecharGLON[185/217] Galactic longitudedegpos.galactic.lonGLAT[-2.1/3.13] Galactic latitudedegpos.galactic.latplx[0.31/9.99]? Parallaxmaspos.parallax.trigfloatnullablee_plx[0.02/0.1]? Error on plxmasstat.error;pos.parallaxfloatnullableDist[327/10407]? Distancealpos.distanceintnullablee_Dist[1/850]? Error on Distalstat.errorintnullableMJD[58235.8/58600] Modified Julian Date of scan 1dtime.epochdoubleNobsNumber of observations for this star (link to table 3)meta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/161/55/table3Properties of artificial signals used for the signal injection and recovery analysisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameTarget namemeta.id;meta.maincharScan[1/2] Scan numbermeta.idintFreq[1151579746/1729676870] Frequency of injection at the start of the scanHzinstr.filter;em.wl.centraldoubledf/dt[-8.87/8.87] Injected frequency drift rateHz/sarith.rate;em.freqdoubleSNR[10/20] Injected signal to noisestat.snrintDET?Signal was recovered by the pipelinemeta.codecharDOO?Direction-of-origin filter made the correct assignment, (Y)es, (N)o, or N/A.meta.codechar