J/AJ/158/87ivo://CDS.VizieR/J/AJ/158/87doi:10.26093/cds/vizier.51580087CDSDressing C.D.Hardegree-Ullman K.Schlieder J.E.Newton E.R.,Vanderburg A.Feinstein A.D.Duvvuri G.M.Arnold L.Bristow M.,Thackeray B.Abrahams E.S.Ciardi D.R.Crossfield I.J.M.Yu L.,Martinez A.O.Christiansen J.L.Crepp J.R.Isaacson H.2019-10-14T13:56:31Z2019-10-14T14:42:08ZCDS support team

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

cds-question@unistra.frdwarf-starsmultiple-starsstellar-spectral-typesphotometryspectroscopystellar-distanceproper-motionsstellar-massesline-intensitieschemical-abundancesexoplanetsWe present revised stellar properties for 172 K2 target stars that were identified as possible hosts of transiting planets during Campaigns 1-17. Using medium-resolution near-infrared spectra acquired with the NASA Infrared Telescope Facility/SpeX and Palomar/TripleSpec, we found that 86 of our targets were bona fide cool dwarfs, 74 were hotter dwarfs, and 12 were giants. Combining our spectroscopic metallicities with Gaia parallaxes and archival photometry, we derived photometric stellar parameters and compared them to our spectroscopic estimates. Although our spectroscopic and photometric radius and temperature estimates are consistent, our photometric mass estimates are systematically {Delta}M_*_=0.11 M_{sun}_ (34%) higher than our spectroscopic mass estimates for the least massive stars (M_*,phot_<0.4 M_{sun}_). Adopting the photometric parameters and comparing our results to parameters reported in the Ecliptic Plane Input Catalog, our revised stellar radii are {Delta}R_*_=0.15 R_{sun}_ (40%) larger, and our revised stellar effective temperatures are roughly {Delta}T_eff_=65 K cooler. Correctly determining the properties of K2 target stars is essential for characterizing any associated planet candidates, estimating the planet search sensitivity, and calculating planet occurrence rates. Even though Gaia parallaxes have increased the power of photometric surveys, spectroscopic characterization remains essential for determining stellar metallicities and investigating correlations between stellar metallicity and planetary properties.2019AJ....158...87Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/158/87CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)I/345 : Gaia DR2 (Gaia Collaboration, 2018)I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)J/ApJ/800/85 : Teff, radii and luminosities of cool dwarfs (Newton+, 2015)J/ApJ/804/64 : Empirical and model parameters of 183 M dwarfs (Mann+, 2015)J/ApJS/216/7 : Planets Around Low-Mass Stars (PALMS). IV. (Bowler+, 2015)J/ApJS/218/26 : Parameters of planets orbiting coolest dwarfs (Swift+, 2015)J/ApJS/222/14 : Planetary candidates from 1st yr K2 mission (Vanderburg+, 2016)J/ApJS/224/2 : K2 EPIC stellar properties for 138600 targets (Huber+, 2016)J/ApJS/226/7 : Planet candidates discovered using K2's 1st yrJ/AJ/154/207 : K2 planetary systems orbiting low-mass stars (Dressing+, 2017)J/ApJ/836/167 : K2 planetary syst. around low-mass stars. I. (Dressing+, 2017)J/AJ/155/21 : Planet candidates from K2 campaigns 5-8 (Petigura+, 2018)J/AJ/155/136 : Planets orbiting bright stars in K2 campaigns 0-10J/AJ/156/22 : Planetary candidates from K2 Campaign 16 (Yu+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/158/87https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/158/87http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/158/87https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/158/87https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/158/87http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/158/87GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/158/87/table2 (Stellar classifications)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/158/87/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/158/87/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/158/87/table2?GETtext/xml+votable180.050000true182.700205-6.29421060.005555555555555556Cone search capability for table J/AJ/158/87/table4 (Candidate stellar companions identified in Gaia DR2 (Cat. I/345))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/158/87/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/158/87/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/158/87/table4?GETtext/xml+votable180.050000true180.10493-6.052428060.0055555555555555566/267 269 286 287 318 1025 1036 1050 1052 1066 4268 4276 4280 4306 4311 4322 4332 4335 4482 4632 4678 4679 4687 4694 4711 4720 4816 4867 4874 4904 17295 17307 17308 17312 17317 17331 18003 18007 18022 18029 18039 18044 18114 18163 18184 18223 18225 18313 18322 18329 18335 18336 18345 18455 18457 18459 18464 18470 18471 18477 18480 18481 18496 18532 18566 18573 18578 18580 18582 18589 18626 18627 18636 18707 18710 18724 18727 18785 18786 23519 23936 23940 23941 23954 23969 24002 24107 24203 24245 24256 24324 24340 24341 24344 24389 24391 25427 25456 25549 25552 25553 25560 25565 25577 25606 25613 25696 25797 25808 25811 26154 26251 26253 26256 26275 26292 26932 26969 26977 26986 26992 26999 27052 27077 27083 27088 27097 27105 27121 27393 27394 27407 27411 27426 27427 27457 27515 27525 27542 27600 27681 27684 27787 27810 28943 29207 29248 29291 29304 29328 29331 29335 29346 29354 29380 30723 42981 43001 44359 44370 44374 44377 44378 44385 44421 447328.650015785639275e-20 9.710690472292815e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/158/87?format=asciidefaultJ/AJ/158/87/table2Stellar classificationsplx[-1.15/35.78]? Gaia DR2 parallaxmaspos.parallax.trigfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEPICStar name in the Ecliptic Plane Input Catalog (Cat. IV/34)meta.id;meta.mainlongprimaryf_EPIC[fgh] Object flag (1)meta.codecharmoreindicates data in Tables 3-7 for this starmeta.ref.urlcharK2K2 name (K2-NNN)meta.idcharSpTypeSpectral typesrc.spTypecharCamp[0/16]? Campaignmeta.numberintnullableKpmag[9.087/16.733] Apparent magnitude in the Kepler bandpassmagphot.mag;em.optfloatKsmag[5.883/13.598]? Apparent 2MASS K_s_ magnitudemagphot.mag;em.IR.KfloatnullableSpeckle[y] ExoFOP reports that star has been observed using speckle imagingmeta.codecharAO[y] ExoFOP reports that star has been observed using adaptive optics imagingmeta.codecharEB[y] ExoFOP reports that the candidate is a likely eclipsing binarymeta.codecharNearby[y] ExoFOP reports that there is another star near the target starmeta.codecharGaia[y close] Assessment about whether the target has a match in Gaia DR2 (Cat. I/345)meta.codecharSource? Designation of crossmatched star in Gaia DR2meta.idnullableDist[28/8546]? Stellar distance calculated by Bailer-Jones et al. (2018, Cat. I/347) based on the Gaia DR2 parallaxpcpos.distance;pos.heliocentricintnullableAF[y] Astrometric flag (G1)meta.codecharEF[y] Excess flag (G2)meta.codecharVF[y] Visibility flag (G3)meta.codecharVP[4/14]? Number of visibility periods used in Gaia DR2meta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/AJ/158/87/table3Spectral indices and Gaia crossmatches for targets classified as evolved starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEPICStar name in the Ecliptic Plane Input Catalogmeta.id;meta.mainlongf_EPIC[ab] Object flag (1)meta.codecharKpmag[9.178/15.605] Apparent magnitude in the Kepler bandpassmagphot.mag;em.optfloatKsmag[5.883/12.612] Apparent 2MASS K_s_ magnitudemagphot.mag;em.IR.KfloatSourceGaia DR2 designationmeta.idpmRA[-14.137402/7.634639]? Gaia DR2 proper motion in Right Ascension (pmRA*cosDE)mas/yrpos.pm;pos.eq.radoublenullablepmDE[-37.565546/3.770199]? Gaia DR2 proper motion in Declinationmas/yrpos.pm;pos.eq.decdoublenullableplx[-0.965834/2.928539]? Gaia DR2 parallaxmaspos.parallax.trigdoublenullableDist[338.334113/7127.918387]? Gaia DR2 distancepcpos.distance;pos.heliocentricdoublenullableInstInstrument used in this work (SpeX or TSPEC)instr.setupcharEW-KI[-0.43472/2.295561]? KI equivalent width from this work ({AA})0.1nmspect.line.eqWidthdoublenullableEW-NaI[-0.755824/1.497482]? NaI equivalent width from this work ({AA})0.1nmspect.line.eqWidthdoublenullableEW-CaII[5.11754/13.595743]? CaII equivalent width from this work ({AA})0.1nmspect.line.eqWidthdoublenullableJ/AJ/158/87/table4Candidate stellar companions identified in Gaia DR2 (Cat. I/345)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEPICStar name in the Ecliptic Plane Input Catalogmeta.id;meta.mainlongSource1Gaia DR2 designation of the primarymeta.id.assocRAdeg1Primary Right Ascension in decimal degrees (ICRS)degpos.eq.ra;meta.mainDEdeg1Primary Declination in decimal degrees (ICRS)degpos.eq.dec;meta.mainpmRA1[-106.0/187.1]? Primary proper motion in Right Ascension (pmRA*cosDE)mas/yrpos.pm;pos.eq.rafloatnullablepmDE1[-237.8/-1.49]? Primary proper motion in Declinationmas/yrpos.pm;pos.eq.decfloatnullableplx1[0.07/15.45]? Primary Gaia DR2 parallaxmaspos.parallax.trigfloatnullableSource2Gaia DR2 designation of the secondarymeta.id.assocRAdeg2Secondary Right Ascension in decimal degrees (ICRS)degpos.eq.raDEdeg2Secondary Declination in decimal degrees (ICRS)degpos.eq.decpmRA2[-27.6/185.5]? Secondary proper motion in Right Ascension (pmRA*cosDE)mas/yrpos.pm;pos.eq.rafloatnullablepmDE2[-208.9/0.62]? Secondary proper motion in Declinationmas/yrpos.pm;pos.eq.decdoublenullableplx2[-1.15/19.98]? Secondary Gaia DR2 parallaxmaspos.parallaxfloatnullableSep[0.46/6.22] Measured separationarcsecpos.angDistancefloatdpm[0.38/272.96]? Separation in proper motionmas/yrpos.pm;arith.difffloatnullableCut[1e-05/3169]? Proper motion cut limitmas/yrpos.pmdoublenullableBoundBound pair inferencemeta.codecharJ/AJ/158/87/paramSpectroscopic (table 5) and photometric (table 6) parameters for cool dwarfsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEPICStar name in the Ecliptic Plane Input Catalogmeta.id;meta.mainlongK2Name of confirmed K2 planet host star (K2-NNN)meta.idcharSpTypeSpectral typesrc.spTypecharTeffsp[3229/4712] Spectroscopic stellar effective temperatureKphys.temperature.effectiveinte_Teffsp[73/229] Lower error on TeffspKstat.error;stat.minintE_Teffsp[73/304] Upper error on TeffspKstat.error;stat.maxintR*sp[0.193/0.763] Spectroscopic stellar radiussolRadphys.size.radiusfloate_R*sp[0.027/0.123] Lower error on R*spsolRadstat.error;stat.minfloatE_R*sp[0.027/0.247] Upper error on R*spsolRadstat.error;stat.maxfloatM*sp[0.129/0.753] Spectroscopic stellar masssolMassphys.massfloate_M*sp[0.072/0.21] Lower error on M*spsolMassstat.error;stat.minfloatE_M*sp[0.068/0.197] Upper error on M*spsolMassstat.error;stat.maxfloatL*sp[0.005/0.278] Spectroscopic stellar luminositysolLumphys.luminosityfloate_L*sp[0.002/0.11] Lower error on L*spsolLumstat.error;stat.minfloatE_L*sp[0.002/0.17] Upper error on L*spsolLumstat.error;stat.maxfloat[Fe/H][-0.423/0.496] Iron abundancephys.abund.Fefloate_[Fe/H][0.08/0.144] Error on [Fe/H]stat.error;phys.abund.Fefloat[M/H][-0.334/0.35] Metallicityphys.abund.Zfloate_[M/H][0.08/0.138] Error on [M/H]stat.error;phys.abundfloatf_EPIC[b] Object flag (1)meta.codecharKsMag[3.4/7.562]? Absolute K_s_ magnitudemagphys.magAbs;em.IR.KfloatnullableE_KsMag[0.003/0.125]? Upper error on KsMagmagstat.error;stat.maxfloatnullablee_KsMag[0.004/0.132]? Lower error on KsMagmagstat.error;stat.minfloatnullableTeffph[3223/4532]? Photometric stellar effective temperatureKphys.temperature.effectiveintnullablee_Teffph[57/159]? Error on TeffphKstat.errorintnullableR*ph[0.248/0.723]? Photometric stellar radiussolRadphys.size.radiusfloatnullablef_R*ph[y] Flag on photometric radius estimate (G4)meta.codechare_R*ph[0.007/0.028]? Error on R*phsolRadstat.errorfloatnullableM*ph[0.22/0.752]? Photometric stellar masssolMassphys.massfloatnullablee_M*ph[0.006/0.03]? Error on M*phsolMassstat.errorfloatnullableL*ph[0.007/0.275]? Photometric stellar luminositysolLumphys.luminosityfloatnullablee_L*ph[0/0.017]? Error on L*phsolLumstat.errorfloatnullableJ/AJ/158/87/table7Derived and adopted parameters for cool dwarfsAO[y] ExoFOP reports that star has been observed using adaptive optics imagingmeta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEPICStar name in the Ecliptic Plane Input Catalogmeta.id;meta.mainlongK2Name of confirmed K2 planet host star (K2-NNN)meta.idcharSpTypeSpectral typesrc.spTypecharKsMag[3.4/7.562]? Absolute K_s_ magnitudemagphys.magAbs;em.IR.Kfloatnullablee_KsMag[-0.125/-0.003]? Lower error on KsMagmagstat.error;stat.minfloatnullableE_KsMag[-0.132/-0.004]? Upper error on KsMagmagstat.error;stat.maxfloatnullableCamp[0/16]? K2 Campaign in which target was observedmeta.numberintnullableKpmag[10.277/16.733] Apparent magnitude in the Kepler bandpassmagphot.mag;em.optfloatKsmag[7.193/13.598] Apparent K_s_ magnitudemagphot.mag;em.IR.KfloatSpeckle[y] ExoFOP reports that star has been observed using speckle imagingmeta.codecharNearby[y] ExoFOP reports that there is another star near the target starmeta.codecharGaia[y] Assessment about whether the target has a match in Gaia DR2meta.codecharSource? Designation of crossmatched star in Gaia DR2meta.idnullableplx[1.788/35.778]? Parallax reported in Gaia DR2arcsecpos.parallax.trigfloatnullableDist[27.928/550.553]? Stellar distance calculated by Bailer-Jones et al. (2018, Cat. I/347) based on the Gaia DR2 parallaxpcpos.distance;pos.heliocentricfloatnullableVF[y] Visibility flag (G3)meta.codecharVP[4/14]? Number of visibility periods used in Gaia DR2meta.numberintnullableTeff[3178/4532] Adopted stellar effective temperatureKphys.temperature.effectiveinte_Teff[57/191] Lower error on TeffKstat.error;stat.minintE_Teff[57/265] Upper error on TeffKstat.error;stat.maxintf_Teff[phot/spec] Provenance of adopted stellar effective temperaturemeta.codecharR*[0.248/0.743] Adopted stellar radiussolRadphys.size.radiusfloate_R*[0.007/0.092] Lower error on R*solRadstat.error;stat.minfloatE_R*[0.007/0.175] Upper error on R*solRadstat.error;stat.maxfloatf_R*[phot/spec] Provenance of adopted radiusmeta.codecharM*[0.22/0.752] Adopted stellar masssolMassphys.massfloate_M*[0.006/0.093] Lower error on M*solMassstat.error;stat.minfloatE_M*[0.006/0.174] Upper error on M*solMassstat.error;stat.maxfloatf_M*[phot/spec] Provenance of adopted massmeta.codecharL*[0.005/0.278] Adopted stellar luminositysolLumphys.luminosityfloate_L*[0/0.11] Lower error on L*solLumstat.error;stat.minfloatE_L*[0/0.17] Upper error on L*solLumstat.error;stat.maxfloatf_L*[phot/spec] Provenance of adopted luminositymeta.codecharTeffph[3222.941/4531.989]? Photometric stellar effective temperatureKphys.temperature.effectivedoublenullablee_Teffph[56.996/158.57]? Error on TeffphKstat.errorfloatnullableR*ph[0.248/0.723]? Photometric stellar radiussolRadphys.size.radiusfloatnullablee_R*ph[0.007/0.028]? Error on R*phsolRadstat.errorfloatnullableM*ph[0.22/0.752]? Photometric stellar masssolMassphys.massfloatnullablee_M*ph[0.006/0.03]? Error on M*phsolMassstat.errorfloatnullableL*ph[0.007/0.275]? Photometric stellar luminositysolLumphys.luminosityfloatnullablee_L*ph[0/0.017]? Error on L*phsolLumstat.errorfloatnullablef_R*ph[y] Flag on photometric radius estimate (G4)meta.codecharTeffsp[3229/4712] Spectroscopic stellar effective temperatureKphys.temperature.effectiveinte_Teffsp[73/229] Lower error on TeffspKstat.error;stat.minintE_Teffsp[73/304] Upper error on TeffspKstat.error;stat.maxintR*sp[0.193/0.763] Spectroscopic stellar radiussolRadphys.size.radiusfloate_R*sp[0.027/0.123] Lower error on R*spsolRadstat.error;stat.minfloatE_R*sp[0.027/0.247] Upper error on R*spsolRadstat.error;stat.maxfloatM*sp[0.129/0.753] Spectroscopic stellar masssolMassphys.massfloate_M*sp[0.072/0.21] Lower error on M*spsolMassstat.error;stat.minfloatE_M*sp[0.068/0.197] Upper error on M*spsolMassstat.error;stat.maxfloatL*sp[0.005/0.278] Spectroscopic stellar luminositysolLumphys.luminosityfloate_L*sp[0.002/0.11] Lower error on L*spsolLumstat.error;stat.minfloatE_L*sp[0.002/0.17] Upper error on L*spsolLumstat.error;stat.maxfloat[Fe/H][-0.423/0.496] Iron abundancephys.abund.Fefloate_[Fe/H][0.08/0.144] Error on iron abundancestat.error;phys.abund.Fefloat[M/H][-0.334/0.35] Metallicityphys.abund.Zfloate_[M/H][0.08/0.138] Error on metallicitystat.error;phys.abunddouble