J/ApJS/253/7ivo://CDS.VizieR/J/ApJS/253/7CDSKirkpatrick J.D.Gelino C.R.Faherty J.K.Meisner A.M.Caselden D.,Schneider A.C.Marocco F.Cayago A.J.Smart R.L.Eisenhardt P.R.,Kuchner M.J.Wright E.L.Cushing M.C.Allers K.N.BardalezGagliuffi D.C.Burgasser A.J.Gagne J.Logsdon S.E.Martin E.C.,Ingalls J.G.Lowrance P.J.Abrahams E.S.Aganze C.Gerasimov R.,Gonzales E.C.Hsu C.-C.Kamraj N.Kiman R.Rees J.Theissen C.,Ammar K.Andersen N.S.Beaulieu P.Colin G.Elachi C.A.Goodman S.J.,Gramaize L.Hamlet L.K.Hong J.Jonkeren A.Khalil M.Martin D.W.,Pendrill W.Pumphrey B.Rothermich A.Sainio A.Stenner A.Tanner C.,Thevenot M.Voloshin N.V.Walla J.Wedracki Z.2024-09-11T13:33:20Z2023-02-24T08:35:49ZCDS support team

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

cds-question@unistra.frvisible-astronomytrigonometric-parallaxbrown-dwarfsstellar-spectral-typesl-dwarfsstellar-massesstellar-distanceinfrared-photometryinfrared-astronomyspectroscopyWe present final Spitzer trigonometric parallaxes for 361 L, T, and Y dwarfs. We combine these with prior studies to build a list of 525 known L, T, and Y dwarfs within 20pc of the Sun, 38 of which are presented here for the first time. Using published photometry and spectroscopy as well as our own follow-up, we present an array of color-magnitude and color-color diagrams to further characterize census members, and we provide polynomial fits to the bulk trends. Using these characterizations, we assign each object a Teff value and judge sample completeness over bins of Teff and spectral type. Except for types >=T8 and Teff<600K, our census is statistically complete to the 20pc limit. We compare our measured space densities to simulated density distributions and find that the best fit is a power law (dN/dM{propto}M^-{alpha}^) with {alpha}=0.6+/-0.1. We find that the evolutionary models of Saumon & Marley correctly predict the observed magnitude of the space density spike seen at 1200K<Teff<1350K, believed to be caused by an increase in the cooling timescale across the L/T transition. Defining the low-mass terminus using this sample requires a more statistically robust and complete sample of dwarfs >=Y0.5 and with Teff<400K. We conclude that such frigid objects must exist in substantial numbers, despite the fact that few have so far been identified, and we discuss possible reasons why they have largely eluded detection.2021ApJS..253....7Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/253/7CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/ApJ/476/311 : 2MASS M-dwarf discoveries (Kirkpatrick+ 1997)J/ApJ/564/421 : Spectra of T dwarfs. I. (Burgasser+, 2002)J/AJ/123/3409 : SDSS M, L, and T dwarfs (Hawley+, 2002)J/AJ/126/1526 : IR photometry of ultracool dwarfs (Bouy+, 2003)J/AJ/126/2487 : T dwarfs in the southern hemisphere (Burgasser+, 2003)J/AJ/126/2421 : 2MASS-Selected sample of ultracool dwarfs (Cruz+, 2003)J/AJ/125/3302 : HST binary very low mass stars & brown dwarfs (Gizis+, 2003)J/AJ/127/2856 : Brown dwarfs in the 2MASS Survey (Burgasser+, 2004)J/AJ/127/3553 : JHK phot. & spectroscopy for L and T dwarfs (Knapp+, 2004)J/A+A/435/363 : Southern Infrared Proper Motion Survey (Deacon+, 2005)J/other/ARA+A/43.195 : L and T dwarf stars (Kirkpatrick, 2005)J/A+A/440/1061 : Southern red high proper motion objects (Lodieu+, 2005)J/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)J/ApJ/637/1067 : NIR spectral classification of T dwarfs (Burgasser+, 2006)J/AJ/131/2722 : New L and T dwarfs from the SDSS (Chiu+, 2006)J/PASP/118/659 : RI photometry of 2MASS late M and L dwarfs (Liebert+, 2006)J/ApJ/651/502 : Spitzer IRAC phot. of M, L, and T dwarfs (Patten+, 2006)J/AJ/132/891 : Binaries among nearby L dwarfs (Reid+, 2006)J/AJ/133/439 : Luminosity function of M7-L8 ultracool dwarfs (Cruz+, 2007)J/AJ/134/1162 : 11 new T dwarfs in 2MASS (Looper+, 2007)J/AJ/133/2258 : Activity and kinematics of ultracool dwarfs (Schmidt+, 2007)J/MNRAS/390/1517 : Proper motions of field L and T dwarfs (Casewell+, 2008)J/ApJ/689/1295 : Lithium test implications for BDs (Kirkpatrick+, 2008)J/ApJ/676/1281 : L and T dwarfs in 2MASS/SDSS (Metchev+, 2008)J/MNRAS/383/831 : New DENIS nearby L and late-M dwarfs (Phan-Bao+, 2008)J/AJ/136/1290 : Ultracool dwarfs from the 2MASS (Reid+, 2008)J/AJ/135/785 : SDSS-DR5 low-mass star spectroscopic sample (West+, 2008)J/AJ/137/1 : PMs and astrometry of late-type dwarfs (Faherty+, 2009)J/ApJ/710/1142 : SpeX spectroscopy of low mass bin. I. (Burgasser+, 2010)J/A+A/510/A99 : Epsilon Indi Ba and Bb IR spectra (King+, 2010)J/ApJS/190/100 : NIR proper motion survey using 2MASS (Kirkpatrick+, 2010)J/AJ/139/1808 : Colors and kinematics of SDSS L dwarfs (Schmidt+, 2010)J/AJ/142/77 : New T dwarfs identified in Pan-STARRS 1 (Deacon+, 2011)J/ApJS/197/19 : First brown dwarfs discovered by WISE (Kirkpatrick+, 2011)J/ApJS/201/19 : Hawaii Infrared Parallax Program. I. (Dupuy+, 2012)J/ApJ/752/56 : BDKP. III. Plx for 70 ultracool dwarfs (Faherty+, 2012)J/MNRAS/427/3280 : Ultra-cool dwarfs at low Galactic latitudes (Folkes+, 2012)J/ApJ/753/156 : T/Y brown dwarfs with WISE photometry (Kirkpatrick+, 2012)J/ApJ/748/93 : K-band spectra for 133 nearby M dwarfs (Rojas-Ayala+, 2012)J/MNRAS/433/457 : 76 T dwarfs from the UKIDSS LAS (Burningham+, 2013)J/MNRAS/430/1171 : Sub-stellar birth rate from UKIDSS (Day-Jones+, 2013)J/ApJS/205/6 : T dwarf population revealed by WISE (Mace+, 2013)J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)J/PASP/125/809 : New nearby M, L, and T dwarfs (Thompson+, 2013)J/ApJ/794/143 : New SpeX Observations of M7-L6 Dwarfs (Bardalez+, 2014)J/ApJ/792/119 : Companions to nearby stars from Pan-STARRS 1 (Deacon+, 2014)J/AJ/147/94 : Solar neighborhood. XXXII. L and M dwarfs (Dieterich+, 2014)J/ApJ/783/121 : BANYAN II. Nearby young assoc. cand. members (Gagne+, 2014)J/ApJ/783/122 : AllWISE motion survey (Kirkpatrick+, 2014)J/ApJ/781/4 : Photometry of high PM objects from WISE (Luhman, 2014)J/ApJ/787/126 : WISE reduced proper motions & spectral types (Luhman+, 2014)J/ApJ/792/30 : NEOWISE magnitudes for near-Earth objects (Mainzer+, 2014)J/AJ/147/34 : SpeX library of L-type dwarfs (Schneider+, 2014)J/MNRAS/443/2327 : New proper motion objects from UKIDSS GPS (Smith+, 2014)J/MNRAS/454/593 : Young moving groups in solar neighbourhood (Bell+, 2015)J/ApJ/814/118 : L/T transition dwarfs with PS1 & WISE. II. (Best+, 2015)J/ApJ/810/158 : M,L,T dwarfs fundamental param. and SEDs (Filippazzo+, 2015)J/ApJS/219/33 : BANYAN. VII. Candidate YMG members from BASS (Gagne+, 2015)J/MNRAS/449/3651 : L and T dwarfs from UKIDSS LAS (Marocco+, 2015)J/AJ/149/5 : Solar neighborhood. XXXV. M dwarfs (Winters+, 2015)J/ApJS/225/10 : Kinematic analysis of M7-L8 dwarfs (Faherty+, 2016)J/ApJS/224/36 : The AllWISE motion survey (AllWISE2) (Kirkpatrick+, 2016)J/ApJ/833/96 : Hawaii infrared plx prog. II. Ultracool dwarfs (Liu+, 2016)J/ApJ/817/112 : NEOWISE/AllWISE high PM objects (Schneider+, 2016)J/AJ/152/24 : Trigonometric plx of 134 low-mass stars (Weinberger+, 2016)J/AJ/154/151 : Solar neighborhood .XXXX. New young stars (Bartlett+, 2017)J/AJ/154/147 : Astrometry & phot. for late-type subdwarfs (Dahn+, 2017)J/MNRAS/468/3499 : Partially resolved binaries in PS1 data (Deacon+, 2017)J/ApJS/231/15 : Astrometric monitoring of ultracool binaries (Dupuy+, 2017)J/MNRAS/465/4723 : Log of SALT-RSS observations (Koen+, 2017)J/ApJ/842/118 : BDs with spectral type later than T6 (Leggett+, 2017)J/AJ/153/95 : Catalog of Suspected Nearby Young Stars (Riedel+, 2017)J/AJ/154/69 : ACRONYM II. {beta} Pictoris Moving Group (Shkolnik+, 2017)J/MNRAS/469/401 : Known LT dwarfs in the Gaia DR1 (Smart+, 2017)J/ApJ/856/23 : BANYAN. XI. The BANYAN {Sigma} algorithm (Gagne+, 2018)J/ApJ/854/145 : Opt. phot. & NIR spectroscopy of Wolf 1130 (Mace+, 2018)J/ApJ/867/109 : Spitzer observations of Y and T dwarfs (Martin+, 2018)J/A+A/619/L8 : Ultra-cool dwarfs candidates in Gaia DR2 (Reyle, 2018)J/AJ/158/182 : Discoveries from NEOWISE proper motion survey (Greco+, 2019)J/ApJS/240/19 : Parallaxes of late-T and Y dwarfs (Kirkpatrick+, 2019)J/AJ/157/101 : HST/WFC3 NIR spectral library (Manjavacas+, 2019)J/A+A/629/A139 : Closest stars to the Sun within 50pc catalog (Torres+, 2019)J/AJ/159/257 : Hawaii IR plx program. IV. L0-T8 with UKIRT (Best+, 2020)J/A+A/642/A179 : beta Pictoris moving group RVs (Miret-Roig+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/253/7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/253/7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/253/7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/253/7https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/253/7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/253/7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/253/7/tablea1 (Amassed spectroscopic, astrometric, and photometric data for objects listed in Tables 5-11)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/253/7/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/253/7/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/253/7/tablea1?GETtext/xml+votable180.050000true0.056436925.90501810.005555555555555556Cone search capability for table J/ApJS/253/7/table1 (New L, T, and Y dwarf candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/253/7/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/253/7/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/253/7/table1?GETtext/xml+votable180.050000true6.8623744-1.35074830.005555555555555556Cone search capability for table J/ApJS/253/7/table4 (Astrometry on the Gaia DR2 Reference Frame)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/253/7/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/253/7/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/253/7/table4?GETtext/xml+votable180.050000true1.3236969437.622181110.005555555555555556Cone search capability for table J/ApJS/253/7/plx (Parallax and motion fits for objects with high-quality (Table 5), low-quality (Table 6) and poor-quality (Table 7) parallaxes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/253/7/plx?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/253/7/plx?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/253/7/plx?GETtext/xml+votable180.050000true1.3246669437.621951110.005555555555555556Cone search capability for table J/ApJS/253/7/table11 (The full-sky 20-pc census of L, T, and Y dwarfs (known as of 2020 Oct))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/253/7/table11?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/253/7/table11?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/253/7/table11?GETtext/xml+votable180.050000true0.056436925.90501810.0055555555555555566/10 77 221 320 544 762 849 935 1006 1015 1059 1188 1262 1291 1307 1499 1637 1672 1692 1703 1748 1754 1764 1825 1890 2354 2357 2441 2471 2502 2592 2608 2646 3040 3192 3406 3441 3611 3764 3845 3946 4116 4288 4336 4457 4465 4527 4719 4775 4783 4790 4948 5024-5025 5065 5377 5411 5497 5669 5817 5894 5939 6039 6044 6047 6072 6133 6161 6163 6217 6261 6328 6369 6462 6550 6601 6613 6617 6652 6761 6764 6783 6794 6804 6886 7005 7048 7058 7192 7204 7220 7231 7250 7362 7364 7369 7440 7448 7533 7592 7638 7686 7814 7936 8073 8091 8109 8215 8219 8348 8351 8402 8444 8478 8480 8519 8530 8592 8625 8649 8715 8719 8794 8995 9009 9072-9073 9173 9230 9417 9449 9479 9508 9563-9564 9597 9625 9656 9715 9717 9959 9964 10037 10077-10078 10143 10203 10215 10628 10849 11174 11257 11279 11292 11435 11468 11554 11719 11819 11834 11862 11940 12005 12039 12045 12223 12262 12267 12369 12427 12519 12592 12638 12779 12944 13360 13425 13432 13446 13450 13496 13678 13709 13885 14033 14127 14351 14454 14484 14492 14539 14553 14638 14873 14926 14965 15085 15144 15193 15284 15320 15516 15530 15597 15651 15802 15846 15978 15984 15994 15997 16053 16085 16226 16546 16570 16850 17003 17075 17137 17166 17299 17332 17486 17530 17630 17760 17906 17917 17930 18017 18032 18055 18067 18138 18156 18182 18266 18281 18423 18451 18683 18799 18869 19050 19121 19144 19172 19237 19352 19369 19423 19467 19540 19614 19647 19657 19763 19813 19857 19910 19912 19931 19963 19992 19995 20141 20273 20436 20451 20468 20472 20481 20581 20623 20775 20896 20941 21105 21111 21157 21209 21296 21319 21375 21401 21597 21637 21660 21715 21729 21809 21874 21910 22067 22073 22245 22521 22597 22681 22708 22759 22861 22919 23010 23026 23086 23125 23184 23193 23274 23388 23403 23471 23530 23654 23723 23767 23770 23975 24040 24256 24345 24387 24566 24573 24587 24590-24591 24652 24694 24707-24708 24927 25055 25100 25159 25228 25231 25270 25310 25314 25348 25432 25482 25558 25613 25623 25966 25999 26020 26117 26177 26184 26196 26210 26225 26248 26282 26300 26514 26555 26564 26570 26642 26792-26793 26886 26908 27019 27058 27074 27201 27332 27384 27403 27414 27501 27514 27541 27547 27622 27635-27636 27685 27698 27730 27848 27988 28006 28018 28040 28128 28148 28316 28344 28346 28382 28488 28530 28847 28952 29301 29305 29384 29421 29452 29557 29639 29657 29678 29709 29789 29987 30002 30159 30433 30488 30521 30749 30870 30883 30924 31009 31011 31062 31225 31268 31319 31502 31520 31549 31714-31715 31747 31871 31992 31998 32172 32260 32419 32426 32551 32580 32586 32609 32641 32643 32650 32652 32705 32757 32932 32978 33031 33166 33183 33228 33257 33303 33309 33518 33558 33565 33587 33589 33602 33616 33660 33746 33767 33851 34196 34234 34304 34325 34388 34397 34406 34486 34645 34656 34660 34747 34780 34871 34893 35014 35021 35064-35065 35081 35197 35201 35346 35364 35374 35499 35522 35529 35572 35883 35902 35906 35951 36009 36038-36039 36041 36072 36237 36253 36602 36736 36845 36848 36890 36922 36964 37002 37041 37390 37404 37466 37472 37477 37502 37519 37595 37637 37835 37921 37982 38039 38176 38267 38330 38345 38363 38472 38528 38683 38786 38889 38928 38951 38978 39042 39066 39204 39330 39482 39485 39607 39650 39674 39678 39683 39750 39807 39835 39958 40069 40191 40228 40249 40332 40397 40403 40488 40560 40656 40669 40738 40882 40905 40947 41005 41028 41079 41091 41222 41276 41557 41666 41984 42049 42255 42270 42278 42434 42527 42635 42739 42855 42881 42986 43062 43213 43290 43410 43445 43475 43595 43773 43957 43966 43977 44013 44033 44101 44118 44139 44259 44270 44286 44338 44426 44658 44807 44881 44978 45125 45127 45247 45276 45282 45328 45332 45361 45426 45445 45564 45752 45840 45957 46019 46070 46138 46217 46334 46357 46361 46376 46384 46433 46444 46602 46607 46613 46617 46843 46883 46925 46972 47030 47258 47386 47495 47513 47601 47640 47661 47922 47940 47997 48033 48124 48231 48252 48320 48409 48557 48637 48858 48886 48905 48957 49084 491391.3088508223161842e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/253/7?format=asciiOpticalInfrareddefaultJ/ApJS/253/7/tablea1Amassed spectroscopic, astrometric, and photometric data for objects listed in Tables 5-11e_pmDE[0.03/101]? Uncertainty in pmDE (4)mas/yrstat.error;pos.pm;pos.eq.decfloatnullableASSource of the astrometry (see refs.dat file)meta.bibcharJMKO[11.4/27]? J-band photometry on the MKO systemmagphot.mag;em.IR.Jdoublenullablee_JMKO[0.01/0.8]? Uncertainty in JMKOmagstat.errorfloatnullableJmag[10.7/21]? J-band photometry one the 2MASS systemmagphot.mag;em.IR.Jdoublenullablee_Jmag[0.01/0.6]? Uncertainty in Jmagmagstat.error;phot.magfloatnullableHmag[9.5/25.3]? H-band photometry on either the MKO or 2MASS systemmagphot.mag;em.IR.HdoublenullableC2SSource of the CatWISE2020 data (8)meta.bibcharPNameShort name position code for object (HHMM+DDMM; J2000) as in other tables; column added by CDSmeta.idcharprimarye_Hmag[0.01/0.5]? Uncertainty in Hmagmagstat.error;phot.magfloatnullableKMKO[10/23.5]? K-band photometry on the MKO systemmagphot.mag;em.IR.Kdoublenullablee_KMKO[0.01/0.5]? Uncertainty in KMKOmagstat.errorfloatnullableKsmag[8.8/19.2]? Ks-band photometry on the 2MASS systemmagphot.mag;em.IR.Kdoublenullablee_Ksmag[0.01/0.6]? Uncertainty in Ksmagmagstat.error;phot.magfloatnullablePhotSSource of the near-IR photometry (5)meta.bibcharRACdegCatWISE2020 Right Ascension (J2000) at Ep=57170 (6)degpos.eq.raDECdegCatWISE2020 Declination (J2000) at Ep=57170 (6)degpos.eq.decpmRAC2[-8/2.7]? CatWISE2020 measured proper motion in RAmas/yrpos.pm;pos.eq.radoublenullablee_pmRAC2[0.002/0.3]? Uncertainty in pmRAC2mas/yrstat.error;pos.pm;pos.eq.radoublenullablepmDEC2[-3.5/1.7]? CatWISE2020 measured proper motion in DEmas/yrpos.pm;pos.eq.decdoublenullablee_pmDEC2[0.002/0.3]? Uncertainty in pmDEC2mas/yrstat.error;pos.pm;pos.eq.decdoublenullableW1magC2[7.9/20]? CatWISE2020 moving-object PSF-fit W1 band photometrymagphot.mag;em.IR.3-4umdoublenullablee_W1magC2[0.004/0.6]? Uncertainty in W1magC2magstat.errordoublenullableW2magC2[7.3/16.7]? CatWISE2020 moving-object PSF-fit W2 band photometrymagphot.mag;em.IR.4-8umdoublenullablee_W2magC2[0.004/0.2]? Uncertainty in W2magC2magstat.errordoublenullableplxC2[-1/0.6]? CatWISE2020 par_pm parallax estimate (7)maspos.parallax.trigdoublenullablee_plxC2[0.01/0.4]? Uncertainty in plxC2 (7)masstat.errorfloatnullableW1mag[7.8/20.1]? cISE stationary-object PSF-fit W1 band photometrymagphot.mag;em.IR.3-4umdoublenullablee_W1mag[0.01/0.6]? Uncertainty in W1magmagstat.error;phot.magdoublenullableW2mag[7.2/17]? WISE stationary-object PSF-fit W2 band photometrymagphot.mag;em.IR.4-8umdoublenullablee_W2mag[0.008/0.3]? Uncertainty in W2magmagstat.error;phot.magdoublenullableW3mag[6.2/13.5]? WISE stationary-object PSF-fit W3 band photometrymagphot.flux.density;em.IR.8-15umdoublenullablee_W3mag[0.01/0.6]? Uncertainty in W3magmagstat.error;phot.magdoublenullableWSSource of the stationary-object photometry (9)meta.bibcharch1mag[7.5/19.7]? Spitzer channel 1 (3.6um) photometrymagphot.mag;em.IR.3-4umdoublenullablee_ch1mag[0.01/0.3]? Uncertainty in ch1magmagstat.error;phot.magdoublenullablech2mag[7.4/17]? Spitzer channel 2 (4.5um) photometrymagphot.mag;em.IR.4-8umdoublenullablee_ch2mag[0.01/0.06]? Uncertainty in ch2magmagstat.error;phot.magdoublenullableSSource of Spitzer photometry (10)meta.bibcharN[MSY] Note (11)meta.notecharFNameFull discovery designation of the system (2)meta.id;meta.maincharm_PNameComponent for objectmeta.code.multipcharNewNew candidate (link to Table 1)meta.ref.urlintnullableNcNumber of astrometry measurements for this star (link to Table 4)meta.numberintnullable_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.mainSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTTable listing (1)meta.notecharNameShort name used in other tables (2)meta.idcharSpTO[-2/19]? Optical spectral type (3)src.spTypefloatnullableSpTIR[-1/22]? Near-IR spectral type (3)src.spTypefloatnullableSpAd[-9/24] Adopted spectral type (3)src.spTypefloatr_SpTOSource of the optical spectral type (see refs.dat file)meta.ref;pos.framecharr_SpTIRSource of the NIR spectral type (see refs.dat file)meta.ref;pos.framecharplx[-12.4/502]? Best measured trigonometric parallax (4)maspos.parallax.trigdoublenullablee_plx[0.019/73]? Uncertainty in plx (4)masstat.error;pos.parallaxdoublenullablepmRA[-8124/3968]? Best measured proper motion, in RA (4)mas/yrpos.pm;pos.eq.radoublenullablee_pmRA[0.03/101]? Uncertainty in pmRA (4)mas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE[-3108/1685]? Best measured proper motion, in DE (4)mas/yrpos.pm;pos.eq.decdoublenullableJ/ApJS/253/7/table1New L, T, and Y dwarf candidatesNoteNote (2)meta.notecharDiscDiscoverer code (3)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCWISECWISE position-based identifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharf_CWISEb: background (1)meta.codecharPNameShort name position code for object (HHMM+DDMM; J2000) as in other tables; column added by CDSmeta.idcharprimarySimbadSimbad 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/ApJS/253/7/table2Objects on the IRAC ch2 Spitzer Parallax ProgramsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCatCatalog used for PName (WISE, CWISE, 2MASS, SDSS, PSO, ULAS, CFBDS, SIMP, VHS, UGPS or PM)instr.setup;meta.tablecharPNameShort name position code for object (HHMM+DDMM; J2000)meta.idcharprimarym_PNameComponent for objectmeta.code.multipcharFirstObs[2004/2019] First observation date, yeartime.epoch;obsLastObs[2018/2020] Last observation date, yeartime.epoch;obsBase[0.5/15] Baseline in years (1)yrtime.intervalfloatEpochsSpitzer IRAC program # (# epochs in program)meta.id;obscharJ/ApJS/253/7/table4Astrometry on the Gaia DR2 Reference FramerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPNameShort name position code for object (HHMM+DDMM; J2000)meta.idcharprimaryRA_ICRS[1.3/359.4] Right Ascension (ICRS) at Ep=MJDdegpos.eq.ra;meta.mainDE_ICRS[-82.2/84.8] Declination (ICRS) at Ep=MJDdegpos.eq.dec;meta.mainSrcSource (1)meta.bibcharMJD[53310.5/58874.8] Epoch, Modified Julian Date (JD-2400000.5)dtime.epochdoubleX[-150232823/153255842] Solar System position, X, of observation in km (2)kmpos.cartesian.x;obsdoubleY[-152281985/148013402] Solar System position, Y, of observation in km (2)kmpos.cartesian.y;obsdoubleZ[-62689519/62070770] Solar System position, Z, of observation in km (2)kmsrc.redshift;obsdoublee_RA_ICRS[0.01/2.5] Positional uncertainty in RAarcsecstat.error;pos.eq.rafloate_DE_ICRS[0.01/2.5] Positional uncertainty in DEarcsecstat.error;pos.eq.decfloatJ/ApJS/253/7/plxParallax and motion fits for objects with high-quality (Table 5), low-quality (Table 6) and poor-quality (Table 7) parallaxesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPNameShort name position code for object (HHMM+DDMM; J2000) as in other tables; column added by CDSmeta.idcharprimary_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.raindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decindexedFNameFull name, position-based identifiermeta.id;meta.maincharRA_ICRSRight Ascension (ICRS) at Ep=MJDdegpos.eq.ra;meta.maine_RA_ICRS[1.6/175] Positional uncertainty in RAmasstat.error;pos.eq.rafloatDE_ICRS[-82.2/84.8] Declination (ICRS) at Ep=MJDdegpos.eq.dec;meta.maine_DE_ICRS[1.6/141] Positional uncertainty in DEmasstat.error;pos.eq.decfloatMJD[57064.5/58254.2] Mean Epoch, t0, Modified Julian Date (JD-2400000.5)dtime.epochdoubleq_plxh=high-quality (Table 5), l=low-quality (Table 6) and p=poor-quality (or unmeasurable) for parallaxes that need improvement (Table 7)meta.code.qualcharplx[-12.4/439]? Absolute parallaxmaspos.parallax.trigfloatnullablee_plx[1.7/73]? Uncertainty in plxmasstat.error;pos.parallaxfloatnullablepmRA[-8123.7/1289.1] Absolute proper motion in RAmas/yrpos.pm;pos.eq.rafloate_pmRA[0.4/59] Uncertainty in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDE[-3107.5/1311.5] Absolute proper motion in DEmas/yrpos.pm;pos.eq.decfloate_pmDE[0.6/45] Uncertainty in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatchisq[9.9/4401] {chi}^2^ of fitstat.fit.chi2floatdof[17/133] Degrees of freedomstat.fit.dofintchisq/dof[0.2/77.2] Reduced {chi}^2^ of fitmeta.notefloatNSp[2/39] Number of Spitzer astrometric epochsmeta.numberintNW1[0/29] Number of unWISE W1 astrometric epochsmeta.numberintNW2[0/29] Number of unWISE W2 astrometric epochsmeta.numberintNGDR2[3/344] Number of Gaia DR2 five-parameter re-registration starsmeta.numberintJ/ApJS/253/7/table8Ancillary Spitzer photometryPNameShort name position code for object (HHMM+DDMM; J2000)meta.idcharprimaryONameOther namemeta.idcharAOR[10374912/67453440]? Spitzer Astronomical Observation Requestmeta.id;obsintnullableBandsList of Spitzer/IRAC bands used ("1"=3.6um or "2"=4.5um)meta.code;instr.filtercharProg[35/90152] Spitzer programmeta.id;obsintIRACIRAC state (1)meta.codecharPISpitzer program PIobs.observercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCatCatalog used for PNameinstr.setup;meta.tablecharJ/ApJS/253/7/table9Spectroscopic follow-uprecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCatCatalog used for PNameinstr.setup;meta.tablecharPNameShort name position code for object (HHMM+DDMM; J2000)meta.idcharprimaryInstrInstrument usedinstr.setupcharObs[2016/2020] Observation date, UT, yeartime.epoch;obsSpTSpectral type(s)src.spTypecharf_SpTSpectral type wavelength regime (1)meta.codecharJ/ApJS/253/7/table10Other objects considered for the 20-pc censusrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPNameShort name position code for object (HHMM+DDMM; J2000)meta.idcharprimaryplx[-12.4/116.4]? Absolute parallax, this workmaspos.parallax.trigfloatnullablee_plx[3.4/72.3]? Uncertainty in plxmasstat.error;pos.parallaxfloatnullableplx-lit[9.9/62.4]? Published parallaxmaspos.parallax.trigfloatnullablee_plx-lit[0.2/19]? Uncertainty in plx-litmasstat.errorfloatnullablen_plx-litReference(s) for plx-lit (3)meta.notecharl_DistLimit flag on Distmeta.code.errorcharDist[7.5/108]? Final distance estimatepcpos.distancefloatnullablef_DistFlag on Dest, bkg=background, ?meta.codechar20pcIncluded in 20pc census?meta.codecharRemarksRemarks (4)meta.notecharCatCatalog used for PNameinstr.setup;meta.tablecharSpTIRSpectral type, bkg=background (1)src.spTypecharn_SpTIRReference for SpT (2)meta.notecharDist-JW2[12.4/42.3]? Distance estimate based on J+W2 magnitudespcpos.distancefloatnullableDist-HSpT[6.6/40.7]? Distance estimate based on H and Spectral typepcpos.distancefloatnullableDist-IRAC[8.2/41.3]? Distance estimate based on IRAC ch1+ch2 magnitudespcpos.distancefloatnullableDist-WISE[10.3/26.5]? Distance estimate based on WISE W1+W2 magnitudespcpos.distancefloatnullableJ/ApJS/253/7/table11The full-sky 20-pc census of L, T, and Y dwarfs (known as of 2020 Oct)r_FNameDiscovery Reference(s) (see refs.dat file)meta.ref;pos.framecharSpTOOptical spectral typesrc.spTypecharf_SpTOFlag on SpTO (2)meta.codecharr_SpTOReference(s) for SpTO (see refs.dat file)meta.ref;pos.framecharSpTIRNear-IR spectral typesrc.spTypecharr_SpTIRReference(s) for SpTIR (see refs.dat file)meta.ref;pos.framecharu_plx[:u ] Uncertainty flag (3)meta.code.error;pos.parallaxcharplx[37.1/501.6]? Absolute parallaxmaspos.parallax.trigdoublenullablee_plx[0.019/21.4]? Uncertainty in plxmasstat.error;pos.parallaxfloatnullablepmtot[11.7/8151.6]? Total proper motionmas/yrpos.pmfloatnullablee_pmtot[0.1/99.7]? Uncertainty in pmtotmas/yrstat.errorfloatnullableASSource of the astrometry (see refs.dat file)meta.bibcharAS-flagsFlags on astrometry (4)meta.codecharTeff[250/2338]? Effective surface temperatureKphys.temperature.effectiveintnullablePNameShort name position code for object (HHMM+DDMM; J2000) as in other tables; column added by CDSmeta.idcharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCatCatalog used for FName if anyinstr.setup;meta.tablecharFNameFull name, position-based identifiermeta.id;meta.maincharm_PNameComponent ID on objectmeta.code.multipcharf_FNameCross identification flags for Table A1 (1)meta.codechare_Teff[10/198]? Uncertainty in TeffKstat.error;phys.temperature.effectiveintnullableNoteSpecial note(s) (5)meta.notechar_RAPositions from Simbad or names (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad or names (declination part)degpos.eq.dec;meta.mainSimbadNameSimbad column added by the CDSmeta.idcharnullableONameOther namemeta.idcharJ/ApJS/253/7/table12Potentially young L, T, and Y dwarfs within 20pc of the SunPNameShort name position code for object (HHMM+DDMM; J2000)meta.idcharprimaryMass[10/25]? Mass in Jupiter mass units (4)(1.898187x10+27kg)phys.massfloatnullablee_Mass[1/6.2]? Uncertainty in Mass (4)(1.898187x10+27kg)stat.error;phys.massfloatnullableB_Mass[12/12]? Upper mass bound (4)(1.898187x10+27kg)phys.mass;stat.maxfloatnullablen_MassReference for Mass (3)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCatCatalog used for PNameinstr.setup;meta.tablecharm_PNameComponent of PNamemeta.code.multipcharONameOther namemeta.idcharSpTOOptical spectral typesrc.spTypeSpTIRNear-IR spectral typesrc.spTypePBan[0/99.8]? Banyan {Sigma} probability%stat.fit.goodnessfloatnullableABanyanBanyan {Sigma} association (1)meta.id.parentPlac[0/56]? LACEwING probability%statintnullableALaceWingLACEwING association (1)meta.id.parentlowgLow gravity object?meta.codecharf_AssocFlag on Association (2)meta.codecharYouthYouth Reference (3)meta.bibcharAssocAssociation member?meta.codecharJ/ApJS/253/7/table14Late-M, L, T, and Y dwarfs with Teff measurementsPNameShort name position code for object (HHMM+DDMM; J2000) as in other tables; column added by CDSmeta.idcharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name, either short name or full name (1)meta.id;meta.maincharSpTIR[-4/24] Numeric near-IR based spectral type (2)src.spTypefloatplx[21.9/439] Absolute parallaxmaspos.parallax.trigfloate_plx[0.02/6.5] Uncertainty in plxmasstat.error;pos.parallaxfloatTeff[250/2871] Effective surface temperatureKphys.temperature.effectiveinte_Teff[23/320] Uncertainty in TeffKstat.error;phys.temperature.effectiveintHmag[6.4/25.3]? H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0.01/0.4]? Uncertainty in Hmagmagstat.error;phot.magfloatnullablen_SpTIRReference for SpT (3)meta.notecharn_plxReference for plx (3)meta.notecharn_TeffReference Teff (3)meta.notecharn_HmagReference Hmag (3)meta.notecharm_PNameComponent for objectmeta.code.multipcharJ/ApJS/253/7/table16Masses for L, T, and Y members of the 20-pc censusPNameShort name position code for object (HHMM+DDMM; J2000) as in other tables; column added by CDSmeta.idcharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameShort name used (1)meta.id;meta.maincharSpTIRSpectral typesrc.spTypeTeff[581/2274]? Effective surface temperatureKphys.temperature.effectiveintnullablee_Teff[10/198]? Uncertainty in TeffKstat.error;phys.temperature.effectiveintnullableMass[10.0/87.0] Mass, Jupiter units (2)(1.898187x10+27kg)meta.unit;phys.massfloate_Mass[0.7/6.14]? Lower or symmetric error on Mass (2)(1.898187x10+27kg)stat.error;phys.massfloatnullableE_Mass[1.1/2.9]? Upper uncertainty on Mass (2)(1.898187x10+27kg)stat.error;stat.maxfloatnullableB_Mass[12.0/12.0]? Upper bound on Mass (2)(1.898187x10+27kg)phys.mass;stat.maxfloatnullableMethMethod (3)meta.notecharn_MassMass references (4)meta.notecharm_PNameComponent ID on PNamemeta.code.multipcharJ/ApJS/253/7/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.notecharAuthFirst autor's name(s)meta.id;meta.maincharBibCodeBibcode of the referencemeta.bib.bibcodecharCommCommentmeta.notechar