J/AJ/170/199ivo://CDS.VizieR/J/AJ/170/199CDSOtani T.Baran A.S.Spence L.C.von Hippel T.Lozano E.L.-,Clark J.M.2026-07-10T13:40:56Z2026-07-10T13:29:45ZCDS support team

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

cds-question@unistra.frmultiple-starsphotometryvisible-astronomyexoplanetsb-starssubdwarf-starsvariable-starsHot subdwarf B (sdB) stars are post-main-sequence stars of high temperature and gravity. Approximately 30% of sdBs exhibit stable pressure and/or gravity-mode pulsations, which can be used via the timing method to test for companion stars and determine their orbital solutions. We used short cadence data from the Transiting Exoplanet Survey Satellite (TESS) to search for previously undiscovered companions to sdBs. In this paper, we focus on searching for companions with orbital periods shorter than 13.5days which are detectable within one sector of TESS data (about 27days). The timing method requires that we derive pulsation frequencies in subsets of data significantly shorter than the periods we are searching for, which we set at 0.5-1.5day. We investigated ten sdB stars with previously detected p-mode pulsations for which at least one p-mode pulsation remains detectable with a signal-to-noise ratio >4 within data subsets of duration 0.5-1.5day. We find that two (TIC 202354658 and TIC 69298924) of these ten sdB stars likely have white-dwarf companions and set limits on companion masses for the other eight sdB stars.2025AJ....170..199Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/170/199CatalogResearchIsServedByTAP VizieR generic servicerelated-toIV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)II/207A : Palomar-Green catalog UV-excess stellar objects (Green+ 1986)J/ApJS/61/569 : KPD UV-excess objects (Downes+, 1986)J/A+A/513/A6 : NOT survey of subdwarf B stars (Ostensen+, 2010)J/MNRAS/421/181 : EC 01541-1409 pulsations frequencies (Reed+, 2012)J/A+A/562/A95 : Orbital solutions of eight close sdB binaries (Geier+, 2014)J/ApJ/845/171 : Rapid. pulsating sdB stars search with GALEX (Boudreaux+, 2017)J/A+A/611/A48 : Seven sdB eclipsing binaries data (Pulley+, 2018)J/ApJ/859/145 : 20yr obs. of the spectr. binary EC 20117-4014 (Otani+, 2018)J/MNRAS/489/1556 : K2 observations of binaries PHL 457 & EQ Psc (Baran+, 2019)J/A+A/635/A193 : Catalogue of hot subdwarf stars DR2 (Geier, 2020)J/MNRAS/495/2844 : Mode identif. in 3 pulsating hot subdwarfs (Sahoo+, 2020)J/A+A/650/A205 : Search for transiting planets around sdBs (Van Grootel+, 2021)J/ApJ/926/17 : 25yr observations of the sdB star AQ Col (Otani+, 2022)J/A+A/669/A48 : South. short-period pulsating hot-subdwarf stars (Baran+, 2023)J/MNRAS/519/2486 : Variab. & sdBs stars in NEH/SEH TESS FFI III (Sahoo+, 2023)J/A+A/710/A280 : Wide sdB binaries parameters (Molina+, 2026)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/170/199https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/170/199http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/170/199https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/170/199https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/170/199http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/170/199GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/170/199/fig3aTIC 69298924 f3 amplitudes (Data behind Figure 3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeMedian observation time, BJD-2,457,000.0dtime.epochdoubleAmpAmplitude, pptsrc.var.amplitudedoublee_AmpUncertainty in Ampstat.error;src.var.amplitudedoubleJ/AJ/170/199/fig3ocTIC 69298924 f3 timing delay (Data behind Figure 3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeMedian observation time, BJD-2,457,000.0dtime.epochdoubleO-CTiming delaysstat.fit.residualdoublee_O-CUncertainty in O-Csstat.error;stat.fit.residualdoubleJ/AJ/170/199/fig6af2TIC 202354658 f2 amplitudes (Data behind Figure 6)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeMedian observation time, BJD-2,457,000.0dtime.epochdoubleAmpAmplitude, pptsrc.var.amplitudedoublee_AmpUncertainty in Ampstat.error;src.var.amplitudedoubleJ/AJ/170/199/fig6af5TIC 202354658 f5 amplitudes (Data behind Figure 6)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeMedian observation time, BJD-2,457,000.0dtime.epochdoubleAmpAmplitude, pptsrc.var.amplitudedoublee_AmpUncertainty in Ampstat.error;src.var.amplitudedoubleJ/AJ/170/199/fig6ocf2TIC 202354658 f2 timing delay (Data behind Figure 6)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeMedian observation time, BJD-2,457,000.0dtime.epochdoubleO-CTiming delaysstat.fit.residualdoublee_O-CUncertainty in O-Csstat.error;stat.fit.residualdoubleJ/AJ/170/199/fig6ocf5TIC 202354658 f5 timing delay (Data behind Figure 6)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeMedian observation time, BJD-2,457,000.0dtime.epochdoubleO-CTiming delaysstat.fit.residualdoublee_O-CUncertainty in O-Csstat.error;stat.fit.residualdouble