J/AJ/165/114ivo://CDS.VizieR/J/AJ/165/114doi:10.26093/cds/vizier.51650114CDSZuckerman A.Ko Z.Isaacson H.Croft S.Price D.Lebofsky M.,Siemion A.2024-01-26T06:07:02Z2024-01-12T06:59:19ZCDS support team

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

cds-question@unistra.frvisible-astronomyspectroscopyeffective-temperaturemetallicitystellar-agesstellar-radiistellar-massesThe Search for Extraterrestrial Intelligence has traditionally been conducted at radio wavelengths, but optical searches are well-motivated and increasingly feasible due to the growing availability of high-resolution spectroscopy. We present a data analysis pipeline to search Automated Planet Finder (APF) spectroscopic observations from the Levy Spectrometer for intense, persistent, narrow-bandwidth optical lasers. We describe the processing of the spectra, the laser search algorithm, and the results of our laser search on 1983 spectra of 388 stars as part of the Breakthrough Listen search for technosignatures. We utilize an empirical spectra-matching algorithm called SpecMatch-Emp to produce residuals between each target spectrum and a set of best-matching catalog spectra, which provides the basis for a more sensitive search than previously possible. We verify that SpecMatch-Emp performs well on APF-Levy spectra by calibrating the stellar properties derived by the algorithm against the SpecMatch-Emp library and against Gaia catalog values. We leverage our unique observing strategy, which produces multiple spectra of each target per night of observing, to increase our detection sensitivity by programmatically rejecting events that do not persist between observations. With our laser search algorithm, we achieve a sensitivity equivalent to the ability to detect an 84kW laser at the median distance of a star in our data set (78.5ly). We present the methodology and vetting of our laser search, finding no convincing candidates consistent with potential laser emission in our target sample.2023AJ....165..114Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/165/114CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/767/94 : 1.1-1.9GHz SETI survey of KOIs. I. (Siemion+, 2013)J/ApJ/844/102 : KIC star plxs from asteroseismology vs Gaia (Huber+, 2017)J/AJ/154/107 : California-Kepler Survey (CKS). I. 1305 stars (Petigura+, 2017)J/ApJ/836/77 : Library of high-S/N optical spectra of FGKM stars (Yee+, 2017)J/AJ/159/280 : Gaia-Kepler stellar properties cat.I. KIC stars (Berger+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/165/114https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/165/114http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/165/114https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/165/114https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/165/114http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/165/114GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/165/114/table3 (Selected columns and rows from the results of SpecMatch-Emp before isochrone analysis)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/165/114/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/165/114/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/165/114/table3?GETtext/xml+votable180.050000true320.0575889-19.85228440.0055555555555555560/https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/165/114?format=asciiOpticaldefaultJ/AJ/165/114/table3Selected columns and rows from the results of SpecMatch-Emp before isochrone analysisrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar identifiermeta.id;meta.maincharprimaryTeff[3430/6702] Effective temperatureKphys.temperature.effectiveinte_Teff[72/126] Error on TeffKstat.error;phys.temperature.effectiveint[Rad][0.4/4.43] log stellar radiuslog(solRad)phys.size.radiusfloate_[Rad][0.07/0.4] Error on [Rad]log(solRad)stat.errorfloat[Fe/H][-0.41/0.15] log metallicityphys.abund.FefloatSimbadSimbad column added by the CDSmeta.ref.urlchare_[Fe/H][0.09] Error on [Fe/H]stat.error;phys.abund.Fefloat[Mass][0.4/1.62] log stellar masslog(solMass)phys.massfloate_[Mass][0.6] Error on [Mass]log(solMass)stat.error;phys.massfloat[Age][9.28/10] log stellar agelog(yr)time.agefloate_[Age][0.23] Error on [Age]log(yr)stat.error;time.agefloatlogg[3.22/4.84] Surface gravitycm.s**-2phys.gravityfloate_logg[0.09] Error on loggcm.s**-2stat.errorfloatAftParameters after isochrone analysis (table4)meta.ref.urlchar_RAPosition from SIMBAD (right ascension part)degpos.eq.ra;meta.main_DEPosition from SIMBAD (declination part)degpos.eq.dec;meta.mainJ/AJ/165/114/table4Selected columns and rows from the results of SpecMatch-Emp after isochrone analysisNameStar identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTeff[3540/6823] Effective temperatureKphys.temperature.effectiveinte_Teff[36/133] Negative error on TeffKstat.error;phys.temperature.effectiveintE_Teff[40/130] Positive error on TeffKstat.error;stat.maxint[Rad][0.37/6.37] log stellar radiuslog(solRad)phys.size.radiusfloate_[Rad][0.01/0.8] Negative error on [Rsun]log(solRad)stat.errorfloatE_[Rad][0.01/2] Positive error on [Rsun]log(solRad)stat.error;stat.maxfloat[Fe/H][0.01/0.4] log metallicityphys.abund.Fefloate_[Fe/H][0.06/0.2] Negative error on [Fe/H]stat.error;phys.abund.FefloatE_[Fe/H][0.06/0.2] Positive error on [Fe/H]stat.error;stat.maxfloat[Mass][0.36/1.86] log stellar masslog(solMass)phys.massfloate_[Mass][0.01/0.4] Negative error on [Mass]log(solMass)stat.error;phys.massfloatE_[Mass][0.01/0.3] Positive error on [Mass]log(solMass)stat.error;stat.maxfloat[Age][1.12/13.8] log stellar agelog(yr)time.agefloate_[Age][0.1/7] Negative error on [Age]log(yr)stat.error;time.agefloatE_[Age][0.2/7] Positive error on [Age]log(yr)stat.error;stat.maxfloatlogg[3.07/4.84] Surface gravitycm.s**-2phys.gravityfloate_logg[0.01/0.2] Negative error on loggcm.s**-2stat.errorfloatE_logg[0.01/0.08] Positive error on loggcm.s**-2stat.error;stat.maxfloat