J/A+A/575/A61ivo://CDS.VizieR/J/A+A/575/A61doi:10.26093/cds/vizier.35750061CDSAnderson D.R.Collier Cameron A.Hellier C.Lendl M.Lister T.A.,Maxted P.F.L.Queloz D.Smalley B.Smith A.M.S.Triaud A.H.M.J.,Brown D.J.A.Gillon M.Neveu-VanMalle M.Pepe F.Pollacco D.,Segransan D.Udry S.West R.G.Wheatley P.J.2017-06-20T13:17:02Z2015-02-24T08:16:24ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsmultiple-starssolar-system-planetsphotometryradial-velocityWe report the discovery of the planets WASP-20b and WASP-28b along with measurements of their sky-projected orbital obliquities. WASP-20b is an inflated, Saturn-mass planet (0.31M_Jup_; 1.46R_Jup_) in a 4.9-day, near-aligned (lambda=12.7+/-4.2{deg}) orbit around CD-24 102 (V=10.7; F9). Due to the low density of the planet and the apparent brightness of the host star, WASP-20 is a good target for atmospheric characterisation via transmission spectroscopy. WASP-28b is an inflated, Jupiter-mass planet (0.91M_Jup_; 1.21R_Jup_) in a 3.4-day, near-aligned (lambda=8+/-18{deg}) orbit around a V=12, F8 star. As intermediate-mass planets in short orbits around aged, cool stars (7^+2^_-1_Gyr and 6000+/-100K for WASP-20; 5^+3^_-2_Gyr and 6100+/-150K for WASP-28), their orbital alignment is consistent with the hypothesis that close-in giant planets are scattered into eccentric orbits with random alignments, which are then circularised and aligned with their stars' spins via tidal dissipation.2015A&A...575A..61Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/575/A61CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/575/A61https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/575/A61http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/575/A61https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/575/A61https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/575/A61http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/575/A61GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/575/A61/table3FTN and EulerCam photometrySetIndex of datasetmeta.id;meta.datasetintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWASP[20,28] WASP star number (20 or 28)meta.id;meta.mainintImagerImager name (EulerCam or FTN)meta.id;instrcharFilterFilter (Gunn-r or Sloan-z')meta.id;instr.filtercharBJDBarycentric Julian Date (UTC) at mid-exposure (BJD-2450000)dtime.epochdoubleNFlux[0.978/1.007] Normalised fluxphot.fluxdoublee_NFlux[0.0005/0.0037] Normalised flux errorstat.errordoubleJ/A+A/575/A61/table2CORALIE and HARPS radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSetIndex of datasetmeta.id;meta.datasetintWASP[20,28] WASP star number (20 or 28)meta.id;meta.mainintSpectSpectrograph (CORALIE or HARPS)dmeta.id;instrcharBJDBarycentric Julian Date (UTC) at mid-exposure (BJD-2450000)time.epochdoubleRV[1.2/24.4] Radial velocitykm/sphys.veloc;pos.heliocentricdoublee_RV[0.001/0.065] Error on radial velocitykm/sstat.errordoubleBSpan[-0.05/0.16] Bisector Spankm/sphys.velocdouble