J/ApJ/813/26ivo://CDS.VizieR/J/ApJ/813/26doi:10.26093/cds/vizier.18130026CDSFavia A.West A.A.Theissen C.A.2017-06-26T11:50:35Z2016-03-14T14:06:59ZCDS support team

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

cds-question@unistra.frproper-motionsm-starsstellar-spectral-typesstellar-distanceradial-velocityWe present a sample of 20 runaway M dwarf candidates (RdMs) within 1kpc of the Sun whose Galactocentric (GC) velocities exceed 400km/s. The candidates were selected from the Sloan Digital Sky Survey (SDSS) DR7 M Dwarf Catalog of West et al. (2011, J/AJ/141/97). Our RdMs have SDSS+USNO-B proper motions that are consistent with those recorded in the PPMXL, LSPM, and combined Wide-field Infrared Survey Explorer+SDSS+Two-micron All-sky Survey catalogs. Sixteen RdMs are classified as dwarfs, while the remaining four RdMs are subdwarfs. We model the Galactic potential using a bulge-disk-halo profile. Our fastest RdM, with a GC velocity of 658.5+/-236.9km/s, is a possible hypervelocity candidate, as it is unbound in 77% of our simulations. About half of our RdMs have kinematics that are consistent with ejection from the Galactic center. Seven of our RdMs have kinematics consistent with an ejection scenario from M31 or M32 to within 2{sigma}, although our distance-limited survey makes such a realization unlikely. No more than four of our RdMs may have originated from the Leo stream. We propose that to within measurement errors, most of our bound RdMs are likely disk runaways or halo objects, and may have been accelerated through a series of multi-body interactions within the Galactic disk or possibly supernovae explosions.2015ApJ...813...26Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/813/26CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/317 : The PPMXL Catalog (Roeser+ 2010)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)I/298 : LSPM-North Catalog (Lepine+ 2005)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/AJ/151/41 : MoVeRS Catalog Schema (Theissen+, 2016)J/AJ/150/77 : Catalog of hypervelocity candidate stars (Vickers+, 2015)J/ApJ/794/146 : M dwarfs with IR excess (Theissen+, 2014)J/AJ/144/93 : Close white dwarf + M dwarf binaries (WD+dM) (Morgan+, 2012)J/ApJ/751/55 : MMT hypervelocity star survey. II. (Brown+, 2012)J/AJ/143/67 : SLoWPoKES. II. Wide, low-mass binaries (Dhital+, 2012)J/AJ/141/97 : SDSS DR7 M dwarfs (West+, 2011)J/PASP/121/117 : Fe & Ti abund. of 12 low-metallicity M stars (Woolf+, 2009)J/AJ/135/785 : SDSS-DR5 low-mass star spectroscopic sample (West+, 2008)J/ApJ/671/1708 : Hypervelocity stars. III (Brown+, 2007)J/AJ/134/2398 : Stellar SEDs in SDSS and 2MASS filters (Covey+, 2007)J/ApJ/660/311 : Hypervelocity stars. II. (Brown+, 2007)J/ApJ/647/303 : Spectroscopic survey of hypervelocity stars (Brown+, 2006)J/AJ/131/582 : Cool white dwarfs in the SDSS (Kilic+, 2006)http://www.sdss3.org/ : SDSS-III home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/813/26https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/813/26http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/813/26https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/813/26https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/813/26http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/813/26GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/813/26/rmd (Properties of runaway M dwarf (RdM) candidates and Galactic potential test results and velocity angles of M31 and Leo Stream)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/813/26/rmd?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/813/26/rmd?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/813/26/rmd?GETtext/xml+votable180.050000true7.5536-18.746380.0055555555555555566/5200 5311 8354 10535 10821 10918 10920 12864 13329 14997 15351 16795 17778 18772 18793 19035 20172 23138 27816 31377https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/813/26?format=asciiOpticaldefaultJ/ApJ/813/26/rmdProperties of runaway M dwarf (RdM) candidates and Galactic potential test results and velocity angles of M31 and Leo StreamrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRunaway M dwarf running number (RdM)meta.idintSDSSSDSS IAU positional format (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharf_SDSS[s] s: extreme subdwarf (see section 3.1); column added by CDSmeta.codecharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainpmRA1[-517/454] Proper Motion in RA, {mu}_{alpha}_ from SDSS+USNO-B (1)mas/yrpos.pm;pos.eq.rafloate_pmRA1[5/7] Uncertainty in pmRA1, {mu}_{alpha}_ (1)mas/yrstat.error;pos.pm;pos.eq.rafloatpmDE1[-448/139] Proper Motion in DEC, {mu}_{delta}_ from SDSS+USNO-B (1)mas/yrpos.pm;pos.eq.decfloate_pmDE1[5/7] Uncertainty in pmDE1, {mu}_{delta}_ (1)mas/yrstat.error;pos.pm;pos.eq.decfloatpmRA2[-519/450] Proper Motion in RA, {mu}_{alpha}_ from PPMXL (2)mas/yrpos.pm;pos.eq.rafloate_pmRA2[7.2] Uncertainty in pmRA2, {mu}_{alpha}_ (2)mas/yrstat.error;pos.pm;pos.eq.rafloatpmDE2[-447/137] Proper Motion in DEC, {mu}_{delta}_ from PPMXL (2)mas/yrpos.pm;pos.eq.decfloate_pmDE2[7.2] Uncertainty in pmDE2, {mu}_{delta}_ (2)mas/yrstat.error;pos.pm;pos.eq.decfloatpmRA3[-525/458] Proper Motion in RA, {mu}_{alpha}_ from WISE+SDSS+2MASS (3)mas/yrpos.pm;pos.eq.rafloate_pmRA3[13/138] Uncertainty in pmRA3, {mu}_{alpha}_ (3)mas/yrstat.error;pos.pm;pos.eq.rafloatpmDE3[-443/159] Proper Motion in DEC, {mu}_{delta}_ from WISE+SDSS+2MASS (3)mas/yrpos.pm;pos.eq.decfloate_pmDE3[15/140] Uncertainty in pmDE3, {mu}_{delta}_ (3)mas/yrstat.error;pos.pm;pos.eq.decfloatpmRA4[-525/457]? Proper Motion in RA, {mu}_{alpha}_ from LSPM (4)mas/yrpos.pm;pos.eq.raintnullablee_pmRA4[14.6]? Uncertainty in pmRA4, {mu}_{alpha}_ (4)mas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE4[-430/143]? Proper Motion in DEC, {mu}_{delta}_ from LSPM (4)mas/yrpos.pm;pos.eq.decintnullablee_pmDE4[12.6]? Uncertainty in pmDE4, {mu}_{delta}_ (4)mas/yrstat.error;pos.pm;pos.eq.decfloatnullableSpT[0/1] M-type spectral subtypesrc.spTypeintzeta[0.2/4.2] Metallicity-dependent parameter, {zeta} (5)meta.notefloate_zeta[0.06/12] Uncertainty in {zeta} (5)stat.errorfloatrmag[16.2/18.1] SDSS r-band PSF, extinction-corrected magnitude (6)magphot.mag;em.opt.Rfloate_rmagUncertainty in rmag (6)magstat.error;phot.mag;em.opt.RfloatDist[232/954] Distancepcpos.distance;pos.heliocentricinte_DistUncertainty in Distpcstat.errorintHRV[-318/185] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRVUncertainty in HRVkm/sstat.errorfloatU[-534/646] Velocity toward Galactic center (7)km/sphys.veloc;pos.galacticfloate_UUncertainty in Ukm/sstat.error;pos.cartesian.xfloatV[-724/150] Velocity toward Galactic rotation (7)km/sphys.veloc.rotat;pos.galacticfloate_VUncertainty in Vkm/sstat.error;pos.cartesian.yfloatW[-244/166] Velocity toward North Galactic Pole (7)km/sphys.veloc;pos.galacticfloate_WUncertainty in Wkm/sstat.error;pos.cartesian.zfloatTV[200/779] Tangential velocity (proper motion scaled to distance)km/sphys.veloc.transversefloate_TVUncertainty in TVkm/sstat.errorfloatVtot[400/659] Velocity of the star with respect to the Galactic centerkm/sphys.veloc;pos.galactocentricfloate_VtotUncertainty in Vtotkm/sstat.errorfloatRvir?[yes/no ] Is unbound if RdM reaches R_vir_ within 2.5Gyrmeta.codechartesc[628/1369]? Escape time for unbound RdMs (8)Myrtime.epochfloatnullableRmax[36.7/174]? Rmax for bound RdMs (8)kpcpos.distancefloatnullableUnbd[0/77.2] Percentage of unbound simulations (9)meta.notefloatbGalactic latitude of the velocity angledegpos.posAngfloate_b2{sigma} uncertainty in bdegstat.errorfloatlGalactic longitude of the velocity angledegpos.posAngfloate_l2{sigma} uncertainty in ldegstat.errorfloatdpsi-M31[38/148] Velocity Angle relative to M31 (10)degpos.posAngfloate_dpsi-M312{sigma} uncertainty in dpsi-M31degstat.errorfloatdpsi-Leo[44/116] Velocity Angle relative to Leo (11)degpos.posAngfloate_dpsi-Leo2{sigma} uncertainty in dpsi-Leodegstat.errorfloatPPMXLDisplay the PPMXL data within 2" (I/317)meta.ref.urlintnullableMoVeRSDisplay the MoVeRS data within 2" (Theissen+, 2016, J/AJ/151/41)meta.ref.urlintnullableW11Display the SDSS-DR7 M dwarfs catalog data (West+, 2011, J/AJ/141/97)meta.ref.urlcharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar