J/ApJ/876/8ivo://CDS.VizieR/J/ApJ/876/8doi:10.26093/cds/vizier.18760008CDSSwihart S.J.Strader J.Chomiuk L.Shishkovsky L.2021-09-08T13:13:59Z2020-10-27T09:29:08ZCDS support team

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

cds-question@unistra.frpulsarsx-ray-binary-starsradial-velocityvisible-astronomyspectroscopyphotometryPSR J1306-40 is a millisecond pulsar (MSP) binary with a non-degenerate companion in an unusually long ~1.097 day orbit. We present new optical photometry and spectroscopy of this system, and model these data to constrain fundamental properties of the binary such as the component masses and distance. The optical data imply a minimum neutron star mass of 1.75+/-0.09M_{sun}_ (1{sigma}) and a high, nearly edge-on inclination. The light curves suggest a large hot spot on the companion, suggestive of a portion of the pulsar wind being channeled to the stellar surface by the magnetic field of the secondary, mediated via an intrabinary shock. The H{alpha} line profiles switch rapidly from emission to absorption near the companion inferior conjunction, consistent with an eclipse of the compact emission region at these phases. At our optically inferred distance of 4.7+/-0.5kpc, the X-ray luminosity is ~10^33^erg/s, brighter than nearly all known redbacks in the pulsar state. The long-period, subgiant-like secondary, and luminous X-ray emission suggest this system may be part of the expanding class of MSP binaries that are progenitors to typical field pulsar-white dwarf binaries.2019ApJ...876....8Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/876/8CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/183 : UBVRI Photometric Standards (Landolt 1992)I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)J/PASP/110/863 : A Stellar Spectral Flux Library: 1150 - 25000 A (Pickles 1998)J/AJ/131/1044 : Chromospherically active stars in the Bulge (Drake, 2006)J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)J/ApJ/769/108 : Optical photometry of 4 millisecond pulsars (Breton+, 2013)J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015)J/ApJ/810/85 : Obs. of first Fermi-LAT sources at Parkes (Camilo+, 2015)J/ApJ/831/89 : Eclipsing LMXB at 3FGL J0427.9-6704 center (Strader+, 2016)J/ApJ/851/31 : 2FGL J0846.0+2820 opt. counterpart follow-up (Swihart+, 2017)J/ApJ/866/83 : Opt/NIR obs. of 1FGLJ1417.7-4407 (Swihart+, 2018)J/ApJ/872/42 : Opt. spectrosc. of redback ms pulsar binaries (Strader+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/876/8https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/876/8http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/876/8https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/876/8https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/876/8http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/876/8GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalRadiodefaultJ/ApJ/876/8/table1Barycentric radial velocities of PSR J1306-40recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date of observationdtime.epochdoubleRV[-194.5/238.7] Barycentric radial velocitykm/sphys.veloc;pos.barycenterfloate_RV[6/20.1] The 1-sigma error in radial velocitykm/sstat.errorfloatJ/ApJ/876/8/table2SMARTS photometry of PSR J1306-40recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date of observationdtime.epochdoubleBandBroadband filter (B, V, or I)meta.code;instr.filtercharomag[16.99/19.72] Apparent magnitude in Bandmagphot.magfloate_omag[0.017/0.2] The 1-sigma error in omagmagstat.error;phot.magfloat