J/MNRAS/523/3090ivo://CDS.VizieR/J/MNRAS/523/3090doi:10.26093/cds/vizier.75233090CDSTuson A.Queloz D.Osborn H.P.Wilson T.G.Hooton M.J.Beck M.,Lendl M.Olofsson G.Fortier A.Bonfanti A.Brandeker A.Buchhave L.A.,Collier Cameron A.Ciardi D.R.Collins K.A.Gandolfi D.Garai Z.,Giacalone S.Gomes da Silva J.Howell S.B.Patel J.A.Persson C.M.,Serrano L.M.Sousa S.G.Ulmer-Moll S.Vanderburg A.Ziegler C.,Alibert Y.Alonso R.Anglada G.Barczy T.Barrado Navascues D.,Barros S.C.C.Baumjohann W.Beck T.Benz W.Billot N.Bonfils X.,Borsato L.Broeg C.Cabrera J.Charnoz S.Conti D.M.Csizmadia Sz.,Cubillos P.E.Davies M.B.Deleuil M.Delrez L.Demangeon O.D.S.,Demory B.-O.Dragomir D.Dressing C.D.Ehrenreich D.Erikson A.,Essack Z.Farinato J.Fossati L.Fridlund M.Furlan E.Gill H.,Gillon M.Gnilka C.L.Gonzales E.Gudel M.Gunther M.N.Hoyer S.,Isaak K.G.Jenkins J.M.Kiss L.L.Laskar J.Latham D.W.Law N.,Lecavelier des Etangs A.Lo Curto G.Lovis C.Luque R.Magrin D.,Mann A.W.Maxted P.F.L.Mayor M.McDermott S.Mecina M.Mordasini C.,Mortier A.Nascimbeni V.Ottensamer R.Pagano I.Palle E.Peter G.,Piotto G.Pollacco D.Pritchard T.Ragazzoni R.Rando N.Ratti F.,Rauer H.Ribas I.Ricker G.R.Rieder M.Santos N.C.Savel A.B.,Scandariato G.Schwarz R.P.Seager S.Segransan D.Shporer A.,Simon A.E.Smith A.M.S.Steller M.Stockdale C.Szabo Gy.M.,Thomas N.Torres G.Tronsgaard R.Udry S.Ulmer B.Van Grootel V.,Vanderspek R.Venturini J.Walton N.A.Winn J.N.Wohler B.2024-11-06T20:34:51Z2023-06-08T08:21:46ZCDS support team

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

cds-question@unistra.frk-starsexoplanetsphotometryvisible-astronomyWe report the discovery of two warm sub-Neptunes transiting the bright (G=9.5mag) K-dwarf HD 15906 (TOI 461, TIC 4646810). This star was observed by the Transiting Exoplanet Survey Satellite (TESS) in sectors 4 and 31, revealing two small transiting planets. The inner planet, HD 15906 b, was detected with an unambiguous period but the outer planet, HD 15906 c, showed only two transits separated by ~734 days, leading to 36 possible values of its period. We performed follow-up observations with the CHaracterising ExOPlanet Satellite (CHEOPS) to confirm the true period of HD 15906 c and improve the radius precision of the two planets. From TESS, CHEOPS and additional ground-based photometry, we find that HD 15906 b has a radius of 2.24+/-0.08 R_{Earth}_ and a period of 10.924709+/-0.000032 days, whilst HD 15906 c has a radius of 2.93^+0.07^_-0.06_R_{Earth}_ and a period of 21.583298^+0.000052^_-0.000055_ days. Assuming zero bond albedo and full day-night heat redistribution, the inner and outer planet have equilibrium temperatures of 668+/-13K and 532+/-10K, respectively. The HD 15906 system has become one of only six multiplanet systems with two warm (<~700K) sub-Neptune sized planets transiting a bright star (G>=10mag). It is an excellent target for detailed characterisation studies to constrain the composition of sub-Neptune planets and test theories of planet formation and evolution.2023MNRAS.523.3090Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/523/3090CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/523/3090https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/523/3090http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/523/3090https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/523/3090https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/523/3090http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/523/3090GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/MNRAS/523/3090/detrlc01CHEOPS visit 1 detrended PIPE data. (File key CH_PR110048_TG005901_V0200)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBarycentric Julian Date (BJD-2457000)dtime.epochdoubleFluxNormalised flux (detrended)phot.flux;arith.ratiodoublee_FluxNormalised flux (detrended) errorstat.error;phot.fluxdoubleJ/MNRAS/523/3090/detrlc02CHEOPS visit 2 detrended PIPE data. (File key CH_PR110048_TG006201_V0200)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBarycentric Julian Date (BJD-2457000)dtime.epochdoubleFluxNormalised flux (detrended)phot.flux;arith.ratiodoublee_FluxNormalised flux (detrended) errorstat.error;phot.fluxdoubleJ/MNRAS/523/3090/detrlc03CHEOPS visit 3 detrended PIPE data. (File key CH_PR110048_TG005301_V0200)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBarycentric Julian Date (BJD-2457000)dtime.epochdoubleFluxNormalised flux (detrended)phot.flux;arith.ratiodoublee_FluxNormalised flux (detrended) errorstat.error;phot.fluxdoubleJ/MNRAS/523/3090/detrlc04CHEOPS visit 4 detrended PIPE data. (File key CH_PR110048_TG005101_V0200)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBarycentric Julian Date (BJD-2457000)dtime.epochdoubleFluxNormalised flux (detrended)phot.flux;arith.ratiodoublee_FluxNormalised flux (detrended) errorstat.error;phot.fluxdoubleJ/MNRAS/523/3090/detrlc05CHEOPS visit 5 detrended PIPE data. (File key CH_PR110048_TG009901_V0200)TimeBarycentric Julian Date (BJD-2457000)dtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFluxNormalised flux (detrended)phot.flux;arith.ratiodoublee_FluxNormalised flux (detrended) errorstat.error;phot.fluxdoubleJ/MNRAS/523/3090/detrlc06CHEOPS visit 6 detrended PIPE data. (File key CH_PR110048_TG009801_V0200)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBarycentric Julian Date (BJD-2457000)dtime.epochdoubleFluxNormalised flux (detrended)phot.flux;arith.ratiodoublee_FluxNormalised flux (detrended) errorstat.error;phot.fluxdoubleJ/MNRAS/523/3090/pipelc01CHEOPS visit 1 raw PIPE data. (File key CH_PR110048_TG005901_V0200)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBarycentric Julian Date (BJD-2457000)dtime.epochdoubleFluxNormalised fluxphot.flux;arith.ratiodoublee_FluxNormalised flux errorstat.error;phot.fluxdoubleRollCHEOPS spacecraft roll angledeginstr.offsetdoublebgBackground fluxinstr.backgrounddoublexcx-coordinate relative to corner of subarraypixpos.cartesian.x;instr.detdoubleycy-coordinate relative to corner of subarraypixpos.cartesian.y;instr.detdoubleFlagData quality flag (1)meta.code.errorintJ/MNRAS/523/3090/pipelc02CHEOPS visit 2 raw PIPE data. (File key CH_PR110048_TG006201_V0200)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBarycentric Julian Date (BJD-2457000)dtime.epochdoubleFluxNormalised fluxphot.flux;arith.ratiodoublee_FluxNormalised flux errorstat.error;phot.fluxdoubleRollCHEOPS spacecraft roll angledeginstr.offsetdoublebgBackground fluxinstr.backgrounddoublexcx-coordinate relative to corner of subarraypixpos.cartesian.x;instr.detdoubleycy-coordinate relative to corner of subarraypixpos.cartesian.y;instr.detdoubleFlagData quality flag (1)meta.code.errorintJ/MNRAS/523/3090/pipelc03CHEOPS visit 3 raw PIPE data. (File key CH_PR110048_TG005301_V0200)FluxNormalised fluxphot.flux;arith.ratiodoublee_FluxNormalised flux errorstat.error;phot.fluxdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBarycentric Julian Date (BJD-2457000)dtime.epochdoubleRollCHEOPS spacecraft roll angledeginstr.offsetdoublebgBackground fluxinstr.backgrounddoublexcx-coordinate relative to corner of subarraypixpos.cartesian.x;instr.detdoubleycy-coordinate relative to corner of subarraypixpos.cartesian.y;instr.detdoubleFlagData quality flag (1)meta.code.errorintJ/MNRAS/523/3090/pipelc04CHEOPS visit 4 raw PIPE data. (File key CH_PR110048_TG005101_V0200)xcx-coordinate relative to corner of subarraypixpos.cartesian.x;instr.detdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBarycentric Julian Date (BJD-2457000)dtime.epochdoubleFluxNormalised fluxphot.flux;arith.ratiodoublee_FluxNormalised flux errorstat.error;phot.fluxdoubleRollCHEOPS spacecraft roll angledeginstr.offsetdoublebgBackground fluxinstr.backgrounddoubleycy-coordinate relative to corner of subarraypixpos.cartesian.y;instr.detdoubleFlagData quality flag (1)meta.code.errorintJ/MNRAS/523/3090/pipelc05CHEOPS visit 5 raw PIPE data. (File key CH_PR110048_TG009901_V0200)RollCHEOPS spacecraft roll angledeginstr.offsetdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBarycentric Julian Date (BJD-2457000)dtime.epochdoubleFluxNormalised fluxphot.flux;arith.ratiodoublee_FluxNormalised flux errorstat.error;phot.fluxdoublebgBackground fluxinstr.backgrounddoublexcx-coordinate relative to corner of subarraypixpos.cartesian.x;instr.detdoubleycy-coordinate relative to corner of subarraypixpos.cartesian.y;instr.detdoubleFlagData quality flag (1)meta.code.errorintJ/MNRAS/523/3090/pipelc06CHEOPS visit 6 raw PIPE data. (File key CH_PR110048_TG009801_V0200)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBarycentric Julian Date (BJD-2457000)dtime.epochdoubleFluxNormalised fluxphot.flux;arith.ratiodoublee_FluxNormalised flux errorstat.error;phot.fluxdoubleRollCHEOPS spacecraft roll angledeginstr.offsetdoublebgBackground fluxinstr.backgrounddoublexcx-coordinate relative to corner of subarraypixpos.cartesian.x;instr.detdoubleycy-coordinate relative to corner of subarraypixpos.cartesian.y;instr.detdoubleFlagData quality flag (1)meta.code.errorintJ/MNRAS/523/3090/wasp_lcGround-based WASP datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBarycentric Julian Date (BJD-2457000)dtime.epochdoubleindexedFluxNormalised fluxphot.flux;arith.ratiodoublee_FluxNormalised flux errorstat.error;phot.fluxdouble