J/ApJ/836/167ivo://CDS.VizieR/J/ApJ/836/167doi:10.26093/cds/vizier.18360167CDSDressing C.D.Newton E.R.Schlieder J.E.Charbonneau D.Knutson H.A.,Vanderburg A.Sinukoff E.2019-02-01T11:30:34Z2019-01-24T14:07:37ZCDS support team

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

cds-question@unistra.frstellar-massesstellar-spectral-typeseffective-temperaturechemical-abundancesline-intensitiesradial-velocitystellar-radiiWe present near-infrared spectra for 144 candidate planetary systems identified during Campaigns 1-7 of the NASA K2 Mission. The goal of the survey was to characterize planets orbiting low-mass stars, but our Infrared Telescope Facility/SpeX and Palomar/TripleSpec spectroscopic observations revealed that 49% of our targets were actually giant stars or hotter dwarfs reddened by interstellar extinction. For the 72 stars with spectra consistent with classification as cool dwarfs (spectral types K3-M4), we refined their stellar properties by applying empirical relations based on stars with interferometric radius measurements. Although our revised temperatures are generally consistent with those reported in the Ecliptic Plane Input Catalog (EPIC), our revised stellar radii are typically 0.13R_{sun}_ (39%) larger than the EPIC values, which were based on model isochrones that have been shown to underestimate the radii of cool dwarfs. Our improved stellar characterizations will enable more efficient prioritization of K2 targets for follow-up studies.2017ApJ...836..167Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/836/167CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)I/317 : The PPMXL Catalog (Roeser+ 2010)III/272 : RAVE 4th data release (Kordopatis+, 2013)V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)V/146 : LAMOST DR1 catalogs (Luo+, 2015)IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)J/A+AS/141/371 : Low-mass stars evolutionary tracks (Girardi+, 2000)J/ApJ/728/117 : Kepler planetary candidates. I. (Borucki+, 2011)J/ApJ/736/19 : Kepler planetary candidates. II. (Borucki+, 2011)J/AJ/142/112 : KIC photometric calibration (Brown+, 2011)J/ApJ/757/112 : Stellar diameters. II. K and M-stars (Boyajian+, 2012)J/ApJ/753/90 : Parameters of K5 and later type Kepler stars (Mann+, 2012)J/ApJ/750/L37 : Stellar parameters of low-mass KOIs (Muirhead+, 2012)J/ApJ/748/93 : K-band spectra for 133 nearby M dwarfs (Rojas-Ayala+, 2012)J/ApJS/204/24 : Kepler planetary candidates. III. (Batalha+, 2013)J/ApJ/767/95 : Improved parameters of smallest KIC stars (Dressing+, 2013)J/ApJ/770/90 : Candidate planets in the habitable zones (Gaidos, 2013)J/AJ/145/52 : Abundances of late K & M dwarfs in bin. systems (Mann+, 2013)J/ApJ/779/188 : Spectra of nearby late K and M Kepler stars (Mann+, 2013)J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)J/A+A/562/A71 : Abundances of solar neighbourhood dwarfs (Bensby+, 2014)J/ApJS/210/19 : Kepler planetary candidates. IV. 22 months (Burke+, 2014)J/MNRAS/437/3133 : Candidate Neptunes around late-type dwarfs (Gaidos+, 2014)J/ApJS/211/2 : Revised properties of Q1-16 Kepler targets (Huber+, 2014)J/ApJ/791/10 : Distribution of planets around cool stars (Morton+, 2014)J/ApJS/213/5 : Cool KOIs. VI. H- and K- band spectra (Muirhead+, 2014)J/AJ/147/20 : Spectroscopy of 447 nearby M dwarfs (Newton+, 2014)J/ApJ/807/45 : Habitable planet cand. around M dwarfs (Dressing+, 2015)J/ApJ/804/64 : Empirical and model parameters of 183 M dwarfs (Mann+, 2015)J/ApJ/809/25 : Stellar & planet properties for K2 candidates (Montet+, 2015)J/ApJ/800/85 : Teff, radii and luminosities of cool dwarfs (Newton+, 2015)J/AJ/149/5 : Solar neighborhood. XXXV. M dwarfs (Winters+, 2015)J/A+A/594/A100 : K2 new planetary and EB candidates (Barros+, 2016)J/ApJS/226/7 : Planet cand. discovered using K2's 1st yr (Crossfield+, 2016)J/MNRAS/457/2877 : Kepler M dwarf stars revised properties (Gaidos+, 2016)J/ApJS/224/2 : K2 EPIC stellar properties for 138600 targets (Huber+, 2016)J/ApJS/222/14 : Planetary cand. from 1st yr K2 mission (Vanderburg+, 2016)J/AJ/154/207 : K2 planetary syst. around low-mass stars (Dressing+, 2017)J/ApJS/239/5 : Variable stars and cand. planets from K2 (Crossfield+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/836/167https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/836/167http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/836/167https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/836/167https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/836/167http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/836/167GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/836/167/table3 (Observations of K2 targets classified as giant stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/836/167/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/836/167/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/836/167/table3?GETtext/xml+votable180.050000true244.0669019-28.64913310.005555555555555556Cone search capability for table J/ApJ/836/167/table4 (Observations of K2 targets classified as hotter dwarfs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/836/167/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/836/167/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/836/167/table4?GETtext/xml+votable180.050000true175.09725814.557340.005555555555555556Cone search capability for table J/ApJ/836/167/lowmass (Cool dwarf radial velocities, inferred stellar parameters and metallicities (tables 5, 6 and 7))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/836/167/lowmass?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/836/167/lowmass?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/836/167/lowmass?GETtext/xml+votable180.050000true169.1171419-3.975440.0055555555555555566/276 282 283 285 313 328 339 340 346 353 363 364 366 404 449 464 467 471 474 476 1064 4246 4247 4253 4269 4275 4281 4303 4322 4332 4333 4523 4632 4662 4672 4677 4678 4679 4681 4683 4688 4696 4698 4700 4704 4716 4720 4816 4867 4875 18451 18476 18477 18481 18491 18565 18567 18585 18626 18632 23523 25606 25610 25613 25624 25627 25628 25629 25650 25654 25660 25663 25673 25674 25675 25697 25698 25710 25721 25722 25725 25726 25750 25754 25792 25793 25794 25797 25802 25806 26928 26935 26944 27006 27076 27078 27657 27658 27690 27704 28933 28941 28952 28954 28955 28965 28979 28999 29014 29027 29043 29349 29354 30734 42910 42978 42981 44370 44779 48051 48055 48059 48098 48121 48501https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/836/167?format=asciidefaultJ/ApJ/836/167/table3Observations of K2 targets classified as giant starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEPIC[201754305/219114906] EPIC numbermeta.id;meta.mainlongDateObservation date (UT)time.epoch;obsnullableInstInstrument (SpeX or TSPEC)meta.id;instrcharSpTMK spectral type (G1)src.spTypecharCamp[1/7] Campaign numbermeta.numberintTeff[3330/6237]? Effective temperatureKphys.temperature.effectiveintnullableE_Teff[33/1219]? Teff positive uncertaintyKstat.error;stat.maxintnullablee_Teff[33/1432]? Teff negative uncertaintyKstat.error;phys.temperature.effectiveintnullablelogg[0.08/4.9]? Log of surface gravitylog(cm.s**-2)phys.gravityfloatnullableE_logg[0.02/2.4]? logg positive uncertaintylog(cm.s**-2)stat.error;stat.maxfloatnullablee_logg[0.02/1.4]? logg negative uncertaintylog(cm.s**-2)stat.errorfloatnullableExoFOPDisplay the EPIC online data from Exoplanet Follow-up Observing Program (ExoFOP) websitemeta.ref.urlchar_RAPosition from K2 EPIC catalog (Huber+, 2017, IV/34) (right ascension part)degpos.eq.ra;meta.main_DEPosition from K2 EPIC catalog (Huber+, 2017, IV/34) (declination part)degpos.eq.dec;meta.mainJ/ApJ/836/167/table4Observations of K2 targets classified as hotter dwarfsInstInstrument (SpeX or TSPEC)meta.id;instrcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEPIC[201754305/219114906] EPIC numbermeta.id;meta.mainlongf_EPIC[cd] Flag on EPIC (1)meta.codecharDateObservation date (UT)time.epoch;obsnullableSpTMK spectral type (G1)src.spTypecharf_SpT[b] Flag on SpT (1)meta.codecharCamp[1/7] Campaign numbermeta.numberintTeff[3330/6237]? Effective temperatureKphys.temperature.effectiveintnullableE_Teff[33/1219]? Teff positive uncertaintyKstat.error;stat.maxintnullablee_Teff[33/1432]? Teff negative uncertaintyKstat.error;phys.temperature.effectiveintnullablelogg[0.08/4.9]? Log of surface gravitylog(cm.s**-2)phys.gravityfloatnullableE_logg[0.02/2.4]? logg positive uncertaintylog(cm.s**-2)stat.error;stat.maxfloatnullablee_logg[0.02/1.4]? logg negative uncertaintylog(cm.s**-2)stat.errorfloatnullableExoFOPDisplay the EPIC online data from Exoplanet Follow-up Observing Program (ExoFOP) websitemeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPosition from K2 EPIC catalog (Huber+, 2017, IV/34) (right ascension part)degpos.eq.ra;meta.main_DEPosition from K2 EPIC catalog (Huber+, 2017, IV/34) (declination part)degpos.eq.dec;meta.mainJ/ApJ/836/167/lowmassCool dwarf radial velocities, inferred stellar parameters and metallicities (tables 5, 6 and 7)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEPIC[201205469/217941732] EPIC numbermeta.id;meta.mainlongm_EPIC[AB] EPIC componentmeta.code.multipcharn_EPIC[e] Flag on EPIC (1)meta.notecharCamp[1/7] Campaign numbermeta.numberintDateObservation datetime.epoch;obsnullableInstInstrument (SpeX or TSPEC)meta.id;instrcharSpTMK spectral type (G1)src.spTypecharInd[0.85/1.1] H_2_O-K2 index (Rojas-Ayala+ 2012, J/ApJ/748/93) (2)spect.indexfloatHSpT[-1.2/5] H_2_O-K2 spectral type (3)src.spTypefloatRV[-83/79.1] Radial velocity (4)km/sphys.veloc;pos.heliocentricfloatf_EPIC[bc] Flag on EPIC (5)meta.codecharTeff[3276/4753] Effective temperatureKphys.temperature.effectiveinte_Teff[73/211] Teff negative uncertaintyKstat.error;phys.temperature.effectiveintE_Teff[73/202] Teff positive uncertaintyKstat.error;stat.maxintRad[0.1/0.8] RadiussolRadphys.size.radiusfloate_Rad[0.02/0.08] Rad negative uncertaintysolRadstat.errorfloatE_Rad[0.02/0.2] Rad positive uncertaintysolRadstat.error;stat.maxfloatMass[0.1/0.8] MasssolMassphys.massfloate_Mass[0.01/0.2] Mass negative uncertaintysolMassstat.error;phys.massfloatE_Mass[0.01/0.2] Mass positive uncertaintysolMassstat.error;stat.maxfloatlogL[-2.4/-0.5] log of luminositylog(solLum)phys.luminosityfloate_logL[0.05/0.7] logL negative uncertaintylog(solLum)stat.errordoubleE_logL[0.05/0.7] logL positive uncertaintylog(solLum)stat.error;stat.maxdoubleEWMg1[1.2/9] Equivalent width of Mg 1.50um features0.1nmspect.line.eqWidth;em.IR.Jfloate_EWMg1[0.06/0.5] EWMg1 uncertainty0.1nmstat.errorfloatEWMg2[0.9/6.2] Equivalent width of Mg 1.57um features0.1nmspect.line.eqWidth;em.IR.Hfloate_EWMg2[0.06/0.6] EWMg2 uncertainty0.1nmstat.errorfloatEWMg3[0.9/5.1] Equivalent width of Mg 1.71um features0.1nmspect.line.eqWidth;em.IR.Hfloate_EWMg3[0.04/0.4] EWMg3 uncertainty0.1nmstat.errorfloatEWAla[0.6/2.5] EW of Al 1.67um features a0.1nmspect.line.eqWidth;em.IR.Hfloate_EWAla[0.04/0.3] EWAla uncertainty0.1nmstat.errorfloatEWAlb[0.6/3.2] EW of Al 1.67um features b0.1nmspect.line.eqWidth;em.IR.Hfloate_EWAlb[0.06/0.4] EWAlb uncertainty0.1nmstat.errorfloat[Fe/H][-0.5/0.6]? Metallicity [Fe/H] (6)phys.abund.Zfloatnullablee_[Fe/H][0.08/0.3]? Uncertainty of [Fe/H]stat.error;phys.abund.Fefloatnullable[M/H][-0.4/0.4]? Metallicity [M/H] (6)phys.abund.Zfloatnullablee_[M/H][0.08/0.2]? Uncertainty of [M/H]stat.error;phys.abundfloatnullablePapIIDisplay data from Paper II (Dressing+, 2017 J/AJ/154/207, within 1"meta.ref.urlintnullableExoFOPDisplay the EPIC online data from Exoplanet Follow-up Observing Program (ExoFOP) websitemeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPosition from K2 EPIC catalog (Huber+, 2017, IV/34) (right ascension part)degpos.eq.ra;meta.main_DEPosition from K2 EPIC catalog (Huber+, 2017, IV/34) (declination part)degpos.eq.dec;meta.main