J/A+A/559/A32ivo://CDS.VizieR/J/A+A/559/A32doi:10.26093/cds/vizier.35590032CDSNascimbeni V.Piotto G.Pagano I.Scandariato G.Sani E.Fumana M.2017-06-28T06:58:06Z2014-03-10T16:27:19ZCDS support team

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

cds-question@unistra.frmultiple-starssolar-system-planetsphotometryGJ3470b is a rare example of a "hot Uranus" transiting exoplanet orbiting a nearby M1.5 dwarf. It is crucial for atmospheric studies because it is one of the most inflated low-mass planets known, bridging the boundary between "super-Earths" and Neptunian planets. We present two new ground-based light curves of GJ3470b gathered by the LBC camera at the Large Binocular Telescope. Simultaneous photometry in the ultraviolet ({lambda}_c_=357.5nm) and optical infrared ({lambda}_c_=963.5nm) allowed us to detect a significant change in the effective radius of GJ3470b as a function of wavelength. This can be interpreted as a signature of scattering processes occurring in the planetary atmosphere, which should be cloud-free and with a low mean molecular weight. The unprecedented accuracy of our measurements demonstrates that the photometric detection of Earth-sized planets around M dwarfs is achievable using 8-10m size ground-based telescopes. We provide updated planetary parameters and a greatly improved orbital ephemeris for any forthcoming study of this planet.2013A&A...559A..32Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/559/A32CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/527/A85 : Light curves of HAT-P-3b and HAT-P-14b (Nascimbeni+, 2011)J/A+A/532/A24 : Light curves of HAT-P-13b (Nascimbeni+, 2011)J/A+A/549/A30 : Light curves of WASP-3b (Nascimbeni+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/559/A32https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/559/A32http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/559/A32https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/559/A32https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/559/A32http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/559/A32GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/559/A32/lcbLBC U_spec light curve of GJ3470brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Day (UTC-based)dtime.epochdoublemagNormalized magnitudemagphot.magdoublee_magError on magnitudemagstat.error;phot.magdoubleJ/A+A/559/A32/lcrLBC F972N20 light curve of GJ3470bBJDBarycentric Julian Day (UTC-based)dtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintmagNormalized magnitudemagphot.magdoublee_magError on magnitudemagstat.error;phot.magdouble