J/A+A/686/A171ivo://CDS.VizieR/J/A+A/686/A171doi:10.26093/cds/vizier.36860171CDSZhang J.-Y.Lodieu N.Martin E.L.2025-01-13T20:01:01Z2024-09-03T13:10:12ZCDS support team

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

cds-question@unistra.frlate-type-starsbrown-dwarfsinfrared-photometryvisible-astronomyThe Euclid spacecraft has been launched and will carry out a deep survey benefiting the discovery and characterisation of ultracool dwarfs (UCDs), especially in the Euclid Deep Fields (EDFs), which the telescope will scan repeatedly throughout its mission. The photometric and spectroscopic standards in the EDFs are important benchmarks, crucial for the classification and characterisation of new UCD discoveries and for the calibration of the mission itself. We aim to provide a list of photometric UCD candidates and collect near-infrared reconnaissance spectra for M, L, and T-type UCDs in the EDFs as future Euclid UCD references. In EDF North, we cross-matched public optical and infrared surveys with certain photometric criteria to select UCDs. In EDF Fornax and EDF South, we used photometrically classified samples from the literature. We also include UCDs identified by Gaia DR2. We selected seven UCD targets with different spectral types from the lists and obtained low-resolution 0.9-2.5um spectra of them using GTC/EMIR and the VLT/X-shooter. We also selected a young, bright L dwarf near EDF Fornax to test the coherence of these two facilities. We included one extra T dwarf in EDF North with its published J-band spectrum. We retrieved a list of 81 (49, 231) M, eight (29, 115) L, and one (0, 2) T dwarf candidates in EDF North, Fornax, and South, respectively. They are provided to guide future UCD discoveries and characterisations by Euclid. In total, we collected near-infrared spectra for nine UCDs, including two M types, three L types, and four T types in or close to the three EDFs. The Euclidised spectra show consistency in their spectral classification, which demonstrates that slitless Euclid spectroscopy will recover the spectral types with high fidelity for UCDs, both in the EDFs and in the wide survey. We also demonstrate that Euclid will be able to distinguish different age groups of UCDs.2024A&A...686A.171Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/686/A171CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/489/5301 : DES Y3 substellar LT and M catalogs (Carnero Rosell+, 2019)J/A+A/619/L8 : Ultra-cool dwarfs candidates in Gaia DR2 (Reyle, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/686/A171https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/686/A171http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/686/A171https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/686/A171https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/686/A171http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/686/A171GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/686/A171/tablea1 (81 late-M-type UCD candidates as photometric standards in EDF North and their photometry measurements)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/686/A171/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/686/A171/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/686/A171/tablea1?GETtext/xml+votable180.050000true263.916083365.59491670.005555555555555556Cone search capability for table J/A+A/686/A171/tablea2 (Eight L-type UCD candidates as photometric standards in the EDF North and their photometry measurements)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/686/A171/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/686/A171/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/686/A171/tablea2?GETtext/xml+votable180.050000true266.03964.11094440.005555555555555556Cone search capability for table J/A+A/686/A171/tableb1 (49 M-type UCD candidates as photometric standards in EDF Fornax and their photometry measurements)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/686/A171/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/686/A171/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/686/A171/tableb1?GETtext/xml+votable180.050000true51.799375-28.47319440.005555555555555556Cone search capability for table J/A+A/686/A171/tableb2 (29 L-type UCD candidates as photometric standards in the EDF Fornax and their photometry measurements)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/686/A171/tableb2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/686/A171/tableb2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/686/A171/tableb2?GETtext/xml+votable180.050000true52.6119167-28.94391670.005555555555555556Cone search capability for table J/A+A/686/A171/tablec1 (231 late-M-type UCD candidates as photometric standards in EDF South and their photometry measurements)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/686/A171/tablec1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/686/A171/tablec1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/686/A171/tablec1?GETtext/xml+votable180.050000true56.3297083-48.77883330.005555555555555556Cone search capability for table J/A+A/686/A171/tablec2 (115 L-type UCD candidates as photometric standards in EDF South and their photometry measurements)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/686/A171/tablec2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/686/A171/tablec2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/686/A171/tablec2?GETtext/xml+votable180.050000true56.3999167-49.12405560.005555555555555556Cone search capability for table J/A+A/686/A171/tablec3 (Two T-type UCD candidates as photometric standards in the EDF South and their photometry measurements)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/686/A171/tablec3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/686/A171/tablec3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/686/A171/tablec3?GETtext/xml+votable180.050000true58.132625-49.18316670.0055555555555555565/2901 3839 4010 8579-8582 8592 8983 6/10229 10231 10236-10237 10239 11603 11612-11613 11615 15353-15355 16044-16046 33982-33983 34025-34027 34030 34310-34311 34313 34315 34332-34334 34337 34340-34341 34372 34376 35926 35929 35931 35953 35957 35959 36104 36106 36128 361303.830199579824256e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/686/A171?format=asciiOpticalInfrareddefaultJ/A+A/686/A171/tablea181 late-M-type UCD candidates as photometric standards in EDF North and their photometry measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNote[C *] Note (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainimagDES i magnitudemagphot.mag;em.opt.Ifloate_imagDES i magnitude errormagstat.error;phot.magfloatzmagDES z magnitudemagphot.mag;em.opt.Ifloate_zmagDES z magnitude errormagstat.error;phot.magfloatYmagDES Y magnitudemagphot.mag;em.IR.Jfloate_YmagDES Y magnitude errormagstat.error;phot.magfloatJmag2MASS J magnitudemagphot.mag;em.IR.Jfloate_Jmag2MASS J magnitude errormagstat.error;phot.magfloatHmag2MASS H magnitudemagphot.mag;em.IR.Hfloate_Hmag? 2MASS H magnitudemagstat.error;phot.magfloatnullableKmag2MASS K magnitudemagphot.mag;em.IR.Kfloate_Kmag? 2MASS K magnitudemagstat.error;phot.magfloatnullableW1magWISE W1 magnitudemagphot.mag;em.IR.3-4umfloate_W1magWISE W1 magnitude errormagstat.error;phot.magfloatW2magWISE W2 magnitudemagphot.mag;em.IR.4-8umfloate_W2magWISE W2 magnitude errormagstat.error;phot.magfloatJ/A+A/686/A171/tablea2Eight L-type UCD candidates as photometric standards in the EDF North and their photometry measurementse_W2magWISE W2 magnitude errormagstat.error;phot.magfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNote[C *] Note (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainimagDES i magnitudemagphot.mag;em.opt.Ifloate_imagDES i magnitude errormagstat.error;phot.magfloatzmagDES z magnitudemagphot.mag;em.opt.Ifloate_zmagDES z magnitude errormagstat.error;phot.magfloatYmagDES Y magnitudemagphot.mag;em.IR.Jfloate_YmagDES Y magnitude errormagstat.error;phot.magfloatJmag2MASS J magnitudemagphot.mag;em.IR.Jfloate_Jmag2MASS J magnitude errormagstat.error;phot.magfloatHmag2MASS H magnitudemagphot.mag;em.IR.Hfloate_Hmag? 2MASS H magnitudemagstat.error;phot.magfloatnullableKmag2MASS K magnitudemagphot.mag;em.IR.Kfloate_Kmag? 2MASS K magnitudemagstat.error;phot.magfloatnullableW1magWISE W1 magnitudemagphot.mag;em.IR.3-4umfloate_W1magWISE W1 magnitude errormagstat.error;phot.magfloatW2magWISE W2 magnitudemagphot.mag;em.IR.4-8umfloatJ/A+A/686/A171/tableb149 M-type UCD candidates as photometric standards in EDF Fornax and their photometry measurementsW1mag? WISE W1 magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag? WISE W1 magnitude errormagstat.error;phot.magfloatnullableW2mag? WISE W2 magnitudemagphot.mag;em.IR.4-8umfloatnullablee_W2mag? WISE W2 magnitude errormagstat.error;phot.magfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNote[C *] Note (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSpTypeSpectral type (2)src.spTypecharimag? DES i magnitudemagphot.mag;em.opt.Ifloatnullablee_imag? DES i magnitude errormagstat.error;phot.magfloatnullablezmagDES z magnitudemagphot.mag;em.opt.Ifloate_zmagDES z magnitude errormagstat.error;phot.magfloatYmagDES Y magnitudemagphot.mag;em.IR.Jfloate_YmagDES Y magnitude errormagstat.error;phot.magfloatJmag2MASS J magnitudemagphot.mag;em.IR.Jfloate_Jmag2MASS J magnitude errormagstat.error;phot.magfloatHmag? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? 2MASS H magnitudemagstat.error;phot.magfloatnullableKmag? 2MASS K magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? 2MASS K magnitudemagstat.error;phot.magfloatnullableJ/A+A/686/A171/tableb229 L-type UCD candidates as photometric standards in the EDF Fornax and their photometry measurementsNote[C *] Note (1)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSpTypeSpectral type (2)src.spTypecharimag? DES i magnitudemagphot.mag;em.opt.Ifloatnullablee_imag? DES i magnitude errormagstat.error;phot.magfloatnullablezmagDES z magnitudemagphot.mag;em.opt.Ifloate_zmagDES z magnitude errormagstat.error;phot.magfloatYmagDES Y magnitudemagphot.mag;em.IR.JfloatHmag? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? 2MASS H magnitudemagstat.error;phot.magfloatnullableKmag? 2MASS K magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? 2MASS K magnitudemagstat.error;phot.magfloatnullableW1mag? WISE W1 magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag? WISE W1 magnitude errormagstat.error;phot.magfloatnullableW2mag? WISE W2 magnitudemagphot.mag;em.IR.4-8umfloatnullablee_W2mag? WISE W2 magnitude errormagstat.error;phot.magfloatnullablee_YmagDES Y magnitude errormagstat.error;phot.magfloatJmag2MASS J magnitudemagphot.mag;em.IR.Jfloate_Jmag2MASS J magnitude errormagstat.error;phot.magfloatJ/A+A/686/A171/tablec1231 late-M-type UCD candidates as photometric standards in EDF South and their photometry measurementsYmagDES Y magnitudemagphot.mag;em.IR.Jfloate_YmagDES Y magnitude errormagstat.error;phot.magfloatJmag2MASS J magnitudemagphot.mag;em.IR.Jfloate_Jmag2MASS J magnitude errormagstat.error;phot.magfloatHmag? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? 2MASS H magnitudemagstat.error;phot.magfloatnullableKmag? 2MASS K magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? 2MASS K magnitudemagstat.error;phot.magfloatnullableW1mag? WISE W1 magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag? WISE W1 magnitude errormagstat.error;phot.magfloatnullableW2mag? WISE W2 magnitudemagphot.mag;em.IR.4-8umfloatnullablee_W2mag? WISE W2 magnitude errormagstat.error;phot.magfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNote[C *] Note (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSpTypeSpectral type (2)src.spTypecharimag? DES i magnitudemagphot.mag;em.opt.Ifloatnullablee_imag? DES i magnitude errormagstat.error;phot.magfloatnullablezmagDES z magnitudemagphot.mag;em.opt.Ifloate_zmagDES z magnitude errormagstat.error;phot.magfloatJ/A+A/686/A171/tablec2115 L-type UCD candidates as photometric standards in EDF South and their photometry measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNote[C *] Note (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSpTypeSpectral type (2)src.spTypecharJmag2MASS J magnitudemagphot.mag;em.IR.Jfloate_Jmag2MASS J magnitude errormagstat.error;phot.magfloatHmag? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? 2MASS H magnitudemagstat.error;phot.magfloatnullableimag? DES i magnitudemagphot.mag;em.opt.Ifloatnullablee_imag? DES i magnitude errormagstat.error;phot.magfloatnullablezmagDES z magnitudemagphot.mag;em.opt.Ifloate_zmagDES z magnitude errormagstat.error;phot.magfloatYmagDES Y magnitudemagphot.mag;em.IR.Jfloate_YmagDES Y magnitude errormagstat.error;phot.magfloatKmag? 2MASS K magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? 2MASS K magnitudemagstat.error;phot.magfloatnullableW1mag? WISE W1 magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag? WISE W1 magnitude errormagstat.error;phot.magfloatnullableW2mag? WISE W2 magnitudemagphot.mag;em.IR.4-8umfloatnullablee_W2mag? WISE W2 magnitude errormagstat.error;phot.magfloatnullableJ/A+A/686/A171/tablec3Two T-type UCD candidates as photometric standards in the EDF South and their photometry measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNote[C *] Note (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSpTypeSpectral type (2)src.spTypecharimag? DES i magnitudemagphot.mag;em.opt.Ifloatnullablee_imag? DES i magnitude errormagstat.error;phot.magfloatnullablezmagDES z magnitudemagphot.mag;em.opt.Ifloate_zmagDES z magnitude errormagstat.error;phot.magfloatYmagDES Y magnitudemagphot.mag;em.IR.Jfloate_YmagDES Y magnitude errormagstat.error;phot.magfloatJmag2MASS J magnitudemagphot.mag;em.IR.Jfloate_Jmag2MASS J magnitude errormagstat.error;phot.magfloatHmag? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? 2MASS H magnitudemagstat.error;phot.magfloatnullableKmag? 2MASS K magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? 2MASS K magnitudemagstat.error;phot.magfloatnullableW1mag? WISE W1 magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag? WISE W1 magnitude errormagstat.error;phot.magfloatnullableW2mag? WISE W2 magnitudemagphot.mag;em.IR.4-8umfloatnullablee_W2mag? WISE W2 magnitude errormagstat.error;phot.magfloatnullable