J/MNRAS/482/616ivo://CDS.VizieR/J/MNRAS/482/616doi:10.26093/cds/vizier.74820616CDSBell K.J.Hekker S.Kuszlewicz J.S.2024-08-19T20:15:19Z2022-08-01T13:18:48ZCDS support team

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

cds-question@unistra.frgiant-starsinfrared-astronomyspectroscopyDetecting the presence and characteristic scale of a signal is a common problem in data analysis. We develop a fast statistical test of the null hypothesis that a Fourier-like power spectrum is consistent with noise. The null hypothesis is rejected where the local 'coefficient of variation' (CV) - the ratio of the standard deviation to the mean - in a power spectrum deviates significantly from expectations for pure noise (CV~1.0 for a {Chi}^2^-degrees-of-freedom distribution). This technique is of particular utility for detecting signals in power spectra with frequency-dependent noise backgrounds, as it is only sensitive to features that are sharp relative to the inspected frequency bin width. We develop a CV-based algorithm to quickly detect the presence of solar-like oscillations in photometric power spectra that are dominated by stellar granulation. This approach circumvents the need for background fitting to measure the frequency of maximum solar-like oscillation power, {nu}_max_. In this paper, we derive the basic method and demonstrate its ability to detect the pulsational power excesses from the well-studied APOKASC-2 sample of oscillating red giants observed by Kepler. We recover the catalogued {nu}_max_ values with an average precision of 2.7 per cent for 99.4 per cent of the stars with 4yr of Kepler photometry. Our method produces false positives for <1 per cent of dwarf stars with {nu}_max_ well above the long-cadence Nyquist frequency. The algorithm also flags spectra that exhibit astrophysically interesting signals in addition to single solar-like oscillation power excesses, which we catalogue as part of our characterization of the Kepler light curves of APOKASC-2 targets.2019MNRAS.482..616Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/482/616CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/482/616https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/482/616http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/482/616https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/482/616https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/482/616http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/482/616GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/482/616/tablea1 (CV-based {nu}_max_ measurements for 6656 giants in APOKASC)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/482/616/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/482/616/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/482/616/tablea1?GETtext/xml+votable180.050000true294.648640643.846480.0055555555555555564/922-923 933-935 944-946 5/3645-3647 3683 3704 3706 3729-3731 3760 3788-3789 3792 6/14559 14567 14573 14575 14577-14579 14730-14731 14744 14746 14749-14751 14792 14794-14795 14822 14828 14830-14831 14914-14915 15044-15045 15057 15059-15062 15160 15172-15174 15176 15178 15200 15232https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/482/616?format=asciiInfrareddefaultJ/MNRAS/482/616/tablea1CV-based {nu}_max_ measurements for 6656 giants in APOKASCSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar name (KIC NNNNNNNN)meta.id;meta.maincharnumaxmeas? Frequency of maximum solar-like oscillation power measured by the coefficient of variation (CV) algorithmuHzem.freq;stat.maxfloatnullablenumaxcat? Frequency of maximum solar-like oscillation power from APOKASC-2 (Pinsonneault et al. 2018ApJS..239...32P)uHzem.freq;stat.maxfloatnullablenumaxFliPerFrequency of maximum solar-like oscillation power from FliPer (Bugnet et al. 2017sf2a.conf...85B)uHzem.freq;stat.maxdoublef_numaxmeasFlag on numaxmeas (1)meta.codeint_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main