J/AJ/166/6ivo://CDS.VizieR/J/AJ/166/6doi:10.26093/cds/vizier.51660006CDSChakrabarti S.Simon J.D.Craig P.A.Reggiani H.Brandt T.D.,Guhathakurta P.Dalba P.A.Kirby E.N.Chang P.Hey D.R.Savino A.,Geha M.Thompson I.B.2024-11-06T20:18:51Z2024-02-12T06:40:14ZCDS support team

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

cds-question@unistra.frblack-holesmultiple-starsmilky-way-galaxyvisible-astronomyWe describe the discovery of a solar neighborhood (d=468pc) binary system with a main-sequence sunlike star and a massive noninteracting black hole candidate. The spectral energy distribution of the visible star is described by a single stellar model. We derive stellar parameters from a high signal-to-noise Magellan/MIKE spectrum, classifying the star as a main-sequence star with Teff=5972K, logg=4.54, and M=0.91M{sun} The spectrum shows no indication of a second luminous component. To determine the spectroscopic orbit of the binary, we measured the radial velocities of this system with the Automated Planet Finder, Magellan, and Keck over four months. We show that the velocity data are consistent with the Gaia astrometric orbit and provide independent evidence for a massive dark companion. From a combined fit of our spectroscopic data and the astrometry, we derive a companion mass of 11.39_-1.31_^+1.51^M{sun}. We conclude that this binary system harbors a massive black hole on an eccentric (e=0.46{+/-}0.02), 185.4{+/-}0.1day orbit. These conclusions are independent of El-Badry et al., who recently reported the discovery of the same system. A joint fit to all available data yields a comparable period solution but a lower companion mass of 9.32_-0.21_^+0.22^M{sun}. Radial velocity fits to all available data produce a unimodal solution for the period that is not possible with either data set alone. The combination of both data sets yields the most accurate orbit currently available.2023AJ....166....6Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/166/6CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)II/281 : 2MASS 6X Point Source Working Database / Catalog (Cutri+ 2006)II/336 : AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)II/358 : SkyMapper Southern Sky Survey. DR1.1 (Wolf+, 2018)V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)J/A+A/560/A16 : Comparison of evolutionary tracks (Martins+, 2013)J/A+A/564/A125 : AGN Torus model comparison of AGN in CDFS (Buchner+, 2014)J/A+A/587/A61 : BlackCAT, stellar-mass BH X-ray trans (Corral-Santana+, 2016)J/A+A/625/A104 : parameters of OB stars in SMC wing (Ramachandran+, 2019)J/A+A/627/A177 : Non-LTE analysis of K I in late-type stars (Reggiani+, 2019)J/A+A/630/A104 : Disk and halo stars C, O and Fe abundances (Amarsi+, 2019)J/A+A/632/A3 : MUSE binaries in NGC 3201 (Giesers+, 2019)J/A+A/649/A3 : Gaia ED3 photometric passbands (Riello+, 2021)J/A+A/660/A122 : O stars companion mass function (Reggiani+, 2022)J/A+A/664/A159 : Radial velocities of Galactic SB1s (Mahy+, 2022)J/A+A/674/A10 : Gaia DR3 systems with companions (Holl+, 2023)J/A+AS/125/229 : A standard stellar library (Lejeune+ 1997)J/A+AS/130/65 : A standard stellar library. II. (Lejeune+ 1998)J/AJ/126/2048 : NStars project; the Northern Sample. I. (Gray+, 2003)J/AJ/162/285 : 37 binaries in NGC2516 and NGC2422 (Lipartito+, 2021)J/AJ/163/159 : Species abundances in WASP-77A (Reggiani+, 2022)J/AJ/163/252 : abundances for 15 extreme-velocity stars (Reggiani+, 2022)J/ApJ/805/175 : Keck and APF radial velocities of HD7924 (Fulton+, 2015)J/ApJ/889/27 : Abundances of 11 stars in Carina II and III (Ji+, 2020)J/ApJ/893/96 : CHAOS IV NGC3184 LBT obs. & 3 other gal. abund (Berg+, 2020)J/ApJ/907/17 : HMXB-dominant galaxy sample and properties (Lehmer+, 2021)J/ApJS/224/4 : GOSSS III. 142 add O-type systems (Maiz Apellaniz+, 2016)J/ApJS/225/32 : Extended abundance analysis of cool stars (Brewer+, 2016)J/ApJS/239/32 : APOKASC-2 Kepler evolved stars (Pinsonneault+, 2018)J/MNRAS/400/1479 : RV catalogue of O-type stars in NGC 6611 (Sana+, 2009)J/MNRAS/448/946 : Kepler eclipse timing variation analyses (Borkovits+, 2015)J/other/Sci/337.444 : RV curves of Galactic massive O stars (Sana+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/166/6https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/166/6http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/166/6https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/166/6https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/166/6http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/166/6GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/166/6/table4Atomic data, equivalent widths and line abundancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWave[4082/8774] Wavelength; Angstroms0.1nmem.wldoubleSpeciesSpecies identifiermeta.idcharExPot[0/10] Excitation potentialeVphys.atmol.excitationfloatloggf[-5.63/0.52] log oscillator strengthphys.atmol.oscStrengthfloatEW[7.28/139] Equivalent width; milliAngstroms1e-13mspect.line.eqWidthfloatlogX[1.54/8.71] log abundancephys.abundfloat