J/AJ/153/15ivo://CDS.VizieR/J/AJ/153/15doi:10.26093/cds/vizier.51530015CDSBayliss D.Hojjatpanah S.Santerne A.Dragomir D.Zhou G.Shporer A.,Colon K.D.Almenara J.Armstrong D.J.Barrado D.Barros S.C.C.,Bento J.Boisse I.Bouchy F.Brown D.J.A.Brown T.Cameron A.,Cochran W.D.Demangeon O.Deleuil M.Diaz R.F.Fulton B.Horne K.,Hebrard G.Lillo-Box J.Lovis C.Mawet D.Ngo H.Osborn H.Palle E.,Petigura E.Pollacco D.Santos N.Sefako R.Siverd R.Sousa S.G.,Tsantaki M.2017-09-04T07:58:20Z2017-06-15T08:22:36ZCDS support team

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

cds-question@unistra.frsolar-system-planetsmultiple-starsdwarf-starsinfrared-photometryvisible-astronomybroad-band-photometryradial-velocityWe report the discovery of EPIC 201702477b, a transiting brown dwarf in a long period (40.73691+/-0.00037day) and eccentric (e=0.2281+/-0.0026) orbit. This system was initially reported as a planetary candidate based on two transit events seen in K2 Campaign 1 photometry and later validated as an exoplanet candidate. We confirm the transit and refine the ephemeris with two subsequent ground-based detections of the transit using the Las Cumbres Observatory Global Telescope 1m telescope network. We rule out any transit timing variations above the level of ~30s. Using high precision radial velocity measurements from HARPS and SOPHIE we identify the transiting companion as a brown dwarf with a mass, radius, and bulk density of 66.9+/-1.7M_J_, 0.757+/-0.065R_J_, and 191+/-51g/cm^3^ respectively. EPIC 201702477b is the smallest radius brown dwarf yet discovered, with a mass just below the H-burning limit. It has the highest density of any planet, substellar mass object, or main-sequence star discovered so far. We find evidence in the set of known transiting brown dwarfs for two populations of objects-high mass brown dwarfs and low mass brown dwarfs. The higher-mass population have radii in very close agreement to theoretical models, and show a lower-mass limit around 60M_J_. This may be the signature of mass-dependent ejection of systems during the formation process.2017AJ....153...15Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/153/15CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/594/A100 : K2 new planetary and EB candidates (Barros+, 2016)J/AJ/146/113 : Differential griz photometry of HATS-3 (Bayliss+, 2013)J/A+A/523/A88 : A Jupiter-mass companion around HD 109246 (Boisse+, 2010)J/A+A/505/853 : HD16760 radial velocity curve (Bouchy+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/153/15https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/153/15http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/153/15https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/153/15https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/153/15http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/153/15GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfraredOpticaldefaultJ/AJ/153/15/table1r-band differential photometry for EPIC 201702477 from LCOGT 1mrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date (BJD-2400000)dtime.epochdoubleFlux[0.985/1.007] Relative flux in the r bandphot.flux;arith.ratiodoublee_Flux[0.0014/0.0035] Uncertainty in Fluxstat.error;phot.fluxfloatInstInstrument used to get Flux (CTIO/Sinistro, or SAAO/SBIG) (1)instr.setupcharJ/AJ/153/15/table3SOPHIE and HARPS radial velocities of EPIC 201702477recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date (BJD-2400000)dtime.epochdoubleRV[29.6/38.2] Radial velocitykm/sphys.veloc;pos.heliocentricfloate_RV[0.007/0.06] 1{sigma} error in RV ({sigma}_RV_)km/sstat.errorfloatBS[-0.12/0.13] Bisector span (V_span_)km/sphys.velocfloate_BS[0.01/0.1] 1{sigma} error in Vspan ({sigma}v_span_)km/sstat.errorfloatFWHM[6.3/9.7] Full Width at Half Maximumkm/sspect.line.widthfloate_FWHM[0.013/0.12] 1{sigma} error in FWHM ({sigma}_FWHM_)km/sstat.error;phys.angSizefloatTexp[900/3600] Exposure timestime.duration;obs.exposureintS/N[2.9/21.7] Signal-to-Noise ratio (given per pixel at 550nm)stat.snrfloatInstInstrument used (SOPHIE or HARPS) (1)instr.setupchar