J/ApJ/908/L46ivo://CDS.VizieR/J/ApJ/908/L46doi:10.26093/cds/vizier.19089046CDSRomani R.W.Kandel D.Filippenko A.V.Brink T.G.Zheng W.2024-11-06T20:23:07Z2024-03-13T07:26:34ZCDS support team

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

cds-question@unistra.frmultiple-starsvisible-astronomyspectroscopyinfrared-photometrybroad-band-photometryradial-velocityKeck-telescope spectrophotometry of the companion of PSR-J1810+1744 shows a flat, but asymmetric light-curve maximum and a deep, narrow minimum. The maximum indicates strong gravity darkening (GD) near the L1 point, along with a heated pole and surface winds. The minimum indicates a low underlying temperature and substantial limb darkening. The GD is a consequence of extreme pulsar heating and the near-filling of the Roche lobe. Light-curve modeling gives a binary inclination i=65.7{+/-}0.4. With the Keck-measured radial-velocity amplitude Kc=462.3{+/-}2.2km/s, this gives an accurate neutron star mass MNS=2.13{+/-}0.04M{sun}, with important implications for the dense-matter equation of state. A classic direct-heating model, ignoring the L1 gravitational darkening, would predict an unphysical MNS>3M{sun}. A few other "spider" pulsar binaries have similar large heating and fill factor; thus, they should be checked for such effects.2021ApJ...908L..46Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/908/L46CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/529/A75 : Limb-darkening coefficients (Claret+, 2011)J/ApJS/208/17 : 2nd Fermi LAT cat. of gamma-ray pulsars (2PC) (Abdo+, 2013)J/ApJ/769/108 : Optical photometry of 4 millisecond pulsars (Breton+, 2013)J/A+A/564/A125 : AGN Torus model comparison of AGN in the CDFS (Buchner+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/908/L46https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/908/L46http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/908/L46https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/908/L46https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/908/L46http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/908/L46GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/908/L46/fig1Calibrated ugriz light curvesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintInstInstrument identifier (1)meta.id;instrcharObs? Observation date (3)time.epoch;obsnullablePhase[0.0002/1] Binary phasetime.phasefloatHWidth[0/0.03] Half-Width of Phase rangespect.line.widthfloatmag[19.8/25.2] Apparent magnitude in Bandmagphot.magfloate_mag[0.009/0.2] Uncertainty in magmagstat.error;phot.magfloatBandPhotometric band; ugriz (2)instr.bandpasscharJ/ApJ/908/L46/fig2Radial-velocity measurements for J1810recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPhase[0.02/0.98] Binary phasetime.phasefloatRVel[-882/460] Radial velocity (1)km/sspect.dopplerVelocfloate_RVel[5/66.4] Uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloatR[1.6/34.9] Correlation Significance (1)stat.correlationfloat