J/AJ/160/19ivo://CDS.VizieR/J/AJ/160/19doi:10.26093/cds/vizier.51600019CDSSagear S.A.Skinner J.N.Muirhead P.S.2022-05-13T13:05:07Z2020-10-16T11:45:16ZCDS support team

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

cds-question@unistra.frdwarf-starsl-dwarfsm-starsinfrared-astronomyspectroscopyinfrared-photometrystellar-spectral-typesvisible-astronomyThe occurrence of planets orbiting ultracool dwarfs is poorly constrained. We present results from a guest observer program on NASA's K2 spacecraft to search for transiting planets orbiting a sample of 827 ultracool dwarfs. Having found no transiting planets in our sample, we determined an upper limit on the occurrence of planets. We simulated planets orbiting our sample for a range of orbital periods and sizes. For the simulated planets that transit their host, we injected the transit light curve into the real K2 light curves, then attempted to recover the injected planets. For a given occurrence rate, we calculated the probability of seeing no planets, and use the results to place an upper limit on planet occurrence as a function of planet radius and orbital period. We find that short-period, mini-Neptune and Jupiter-sized planets are rare around ultracool dwarfs, consistent with results for early and mid-type M dwarf stars. We constrain the occurrence rate {eta} for planets between 0.5 and 10 R{earth} with orbital periods between 1 and 26.3days.2020AJ....160...19Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/160/19CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/other/ARA+A/43.195 : L and T dwarf stars (Kirkpatrick, 2005)J/AJ/133/2258 : Activity & kinematics ultracool dwarfs (Schmidt+, 2007)J/AJ/136/1290 : Ultracool dwarfs from the 2MASS (Reid+, 2008)J/A+A/497/619 : New ultra-cool dwarfs from SDSS and 2MASS (Zhang+, 2009)J/MNRAS/404/1817 : 2MASS/SDSS data for 806 ultracool dwarfs (Zhang+, 2010)J/ApJS/201/19 : Hawaii Infrared Parallax Program. I. (Dupuy+, 2012)J/A+A/565/A21 : Astrometry around ultracool dwarfs (Lazorenko+, 2014)J/MNRAS/443/2561 : CONCH-SHELL catalog of nearby M dwarfs (Gaidos+, 2014)J/ApJ/807/45 : Habitable planets orbiting M dwarfs (Dressing+, 2015)J/ApJ/814/130 : Planet occur. rates calculated for KOIs (Mulders+, 2015)J/AJ/149/158 : The BUD sample I. Ldwarf activity sample (Schmidt+,2015)J/MNRAS/449/3966 : Ultracool white dwarfs (Gianninas+, 2015)J/ApJS/224/2 : K2 EPIC stellar properties 138600 targets (Huber+, 2016)J/ApJ/817/112 : NEOWISE/AllWISE high PM objects (Schneider+, 2016)J/A+A/589/A49 : Photometric brown-dwarf classification (Skrzypek+, 2016)J/A+A/598/A92 : New ultracool subdwarfs (Lodieu+, 2017)J/A+A/619/L8 : Ultra-cool dwarfs candidates in Gaia DR2 (Reyle, 2018)J/ApJ/858/55 : K2 ultracool dwarfs III. M6-L0 flares (Paudel+, 2018)J/AJ/158/75 : M dwarfs planet occurrence (Hardegree-Ullman+, 2019)J/AJ/157/231 : MLSDSS-GaiaDR2 sample of M and L dwarfs (Kiman+, 2019)J/A+A/641/A170 : Ultracool dwarf K2 light curves (Sestovic+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/160/19https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/160/19http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/160/19https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/160/19https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/160/19http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/160/19GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/160/19/table1 (K2 ultracool dwarf sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/160/19/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/160/19/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/160/19/table1?GETtext/xml+votable180.050000true67.5301826.139110.0055555555555555565/1063 1067-1069 1071 1074 1082-1083 1155 1157 1159 1165 1169-1170 1172-1174 1177 1179-1182 1216-1217 1219 1222 1225 4326 4698 6498 6848 6859 6861 6866 6873 6897 6/1028 1031 1073 1075 4246-4247 4250-4251 4263 4280-4282 4290 4293 4300-4302 4306 4311 4313 4315 4317-4318 4320-4322 4326-4327 4338 4344 4346-4347 4349-4351 4482-4483 4488 4490-4492 4494-4495 4516 4519 4521-4522 4524 4527 4529-4531 4534 4536-4538 4540 4613 4615 4625 4627 4632-4634 4657 4665 4668-4669 4671 4673 4675 4684-4685 4687 4700-4701 4704-4705 4712-4714 4732-4734 4757 4800-4802 4817 4819-4820 4872-4873 4875 4880 4882-4883 4886 4892 4896-4897 4906 4912 17149-17151 17294-17295 17303 17310 17313 17316-17317 17320-17321 17326 17332 18517 18519 18525 18688 18719 18726 18741-18742 18744 18749-18751 18766 18785-18788 18796-18798 18835-18838 18880-18881 23549 24105 24110 25603 25607 25619 25638 25647 25662-25663 25667 25670 25674 25678 25690 25693 25707 25710 25712 25759 25793 25798 25807 25818 25823 25829 25839 25843-25844 25846-25847 25849-25850 25852-25853 25896 25998 26016-26018 26181 26192 26195 27023 27046 27057-27059 27066-27067 27082-27083 27104 27106 27113 27115 27223 27229 27398-27400 27404-27405 27409-27411 27414 27418 27420-27422 27426-27427 27429 27432-27433 27442-27443 27448 27450 27455-27456 27458-27459 27462 27469 27471 27481-27482 27488-27489 27491 27497 27499-27500 27506 27510-27511 27514 27518 27525 27527 27536-27538 27548 27596-27597 27600 27604 28847 44362 44416 44421 44456 44486 44718 44728 44731 44778 44807https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/160/19?format=asciiOpticalInfrareddefaultJ/AJ/160/19/table1K2 ultracool dwarf samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCampK2 Campaign(s)meta.id;obsEPIC[201453319/251812062] EPIC identificationmeta.id;meta.mainlongGaiaGaia Source identificationmeta.idcharRAJ2000[67.5/359] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-27.7/26.2] Declination (J2000)degpos.eq.dec;meta.mainKpmag[11.59/24.89] Magnitude apparent in Kepler filtermagphot.mag;em.optfloatSpTSpectral Typesrc.spTypecharf_SpTSpectral Type source (1)meta.codecharSimbadSimbad column added by the CDSmeta.ref.urlchar