J/ApJ/813/111ivo://CDS.VizieR/J/ApJ/813/111doi:10.26093/cds/vizier.18130111CDSBakos G.A.Penev K.Bayliss D.Hartman J.D.Zhou G.Brahm R.,Mancini L.de Val-Borro M.Bhatti W.Jordan A.Rabus M.Espinoza N.,Csubry Z.Howard A.W.Fulton B.J.Buchhave L.A.Ciceri S.Henning T.,Schmidt B.Isaacson H.Noyes R.W.Marcy G.W.Suc V.Howe A.R.,Burrows A.S.Lazar J.Papp I.Sari P.2017-06-20T13:16:30Z2016-03-21T15:42:45ZCDS support team

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

cds-question@unistra.frmultiple-starssolar-system-planetsinfrared-photometryvisible-astronomybroad-band-photometryWe report the discovery by the HATSouth network of HATS-7b, a transiting Super-Neptune with a mass of 0.120+/-0.012M_J_, a radius of 0.563_-0.034_^+0.046^R_J_, and an orbital period of 3.1853 days. The host star is a moderately bright (V=13.340+/-0.010mag, Ks=10.976+/-0.026mag) K dwarf star with a mass of 0.849+/-0.027M_{sun}_, a radius of 0.815_-0.035_^+0.049^R_{sun}_, and a metallicity of [Fe/H]=+0.250+/-0.080. The star is photometrically quiet to within the precision of the HATSouth measurements, has low RV jitter, and shows no evidence for chromospheric activity in its spectrum. HATS-7b is the second smallest radius planet discovered by a wide-field ground-based transit survey, and one of only a handful of Neptune-size planets with mass and radius determined to 10% precision. Theoretical modeling of HATS-7b yields a hydrogen-helium fraction of 18+/-4% (rock-iron core and H_2_-He envelope), or 9+/-4% (ice core and H_2_-He envelope), i.e., it has a composition broadly similar to that of Uranus and Neptune, and very different from that of Saturn, which has 75% of its mass in H_2_-He. Based on a sample of transiting exoplanets with accurately (<20%) determined parameters, we establish approximate power-law relations for the envelopes of the mass-density distribution of exoplanets. HATS-7b, which, together with the recently discovered HATS-8b, is one of the first two transiting super-Neptunes discovered in the Southern sky, is a prime target for additional follow-up observations with Southern hemisphere facilities to characterize the atmospheres of Super-Neptunes (which we define as objects with mass greater than that of Neptune, and smaller than halfway between that of Neptune and Saturn, i.e., 0.054M_J_<M_p_<0.18M_J_).2015ApJ...813..111Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/813/111CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)J/A+A/580/A63 : HATS-13b and HATS-14b light and RV curves (Mancini+, 2015)J/AJ/150/49 : Photometry and spectroscopy of HATS-8 (Bayliss+, 2015)J/AJ/148/29 : Spectroscopy & differential photom. of HATS-4 (Jordan+, 2014)J/AJ/147/144 : Differential griz photometry of HATS-5 (Zhou+, 2014)J/AJ/147/128 : HAT-P-44, HAT-P-45, and HAT-P-46 follow-up (Hartman+, 2014)J/MNRAS/437/2831 : 4 transiting F-M binary systems (Zhou+, 2014)J/AJ/146/113 : Differential griz photometry of HATS-3 (Bayliss+, 2013)J/A+A/558/A55 : HATS-2b griz light curves (Mohler-Fischer+, 2013)J/A+A/549/A134 : 4 new WASP transiting close-in giant planets (Hebrard+, 2013)J/AJ/145/5 : Follow-up photometry of HATS-1 (Penev+, 2013)J/AJ/144/139 : HAT-P-39, HAT-P-40, and HAT-P-41 follow-up (Hartman+, 2012)J/A+A/546/A27 : Radial velocity and photometry for GJ3470 (Bonfils+, 2012)J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)J/other/Nat/481.475 : RVs of Kepler-34b + Kepler-35b (Welsh+, 2012)J/ApJ/728/138 : Follow-up photometry of HAT-P-26 (Hartman+, 2011)J/ApJ/726/52 : HAT-P-18 and HAT-P-19 follow-up (Hartman+, 2011)J/ApJ/622/1102 : The planet-metallicity correlation. (Fischer+, 2005)http://www.hatsouth.org/ : The HATSouth exoplanet survey home pagehttp://exoplanetarchive.ipac.caltech.edu/ : NASA exoplanet archive home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/813/111https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/813/111http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/813/111https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/813/111https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/813/111http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/813/111GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfraredOpticaldefaultJ/ApJ/813/111/table2Differential photometry of HATS-7recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDUTC Barycentric Julian date (1)dtime.epochdoublemag[-0.04/0.03] Differential magnitude in Filt (2)magphot.magdoublee_mag[0.0006/0.02] Uncertainty in magmagstat.error;phot.magdoubleOmag[-0.003/13.4]? Raw magnitude without detrending (3)magphot.magdoublenullableFilt[griz] Filter used in the observation (griz)instr.setup;obscharInstInstrument/Telescope used in the observation (4)instr.setup;obschar