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HATS-7b: a hot super Neptune transiting a quiet K dwarf star

Bakos, G. A.; Penev, K.; Bayliss, Daniel; Hartman, J. D.; Zhou, Guyin (George); Brahm, R.; Mancini, L.; De Val-Borro, M.; Bhatti, Waqas; Jordan, A.; Rabus, M.; Espinoza, N.; Csubry, Z.; Howard, Andrew; Fulton, B. J.; Buchhave, L. A.; Ciceri, Simona; Henning, T.; Schmidt, Brian; Isaacson, H.; Noyes, R. W.; Marcy, G. W.; Suc, V.; Howe, A. R.; Burrows, A.; Lazar, J.; Papp, I.; Sari, P.

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We report the discovery by the HATSouth network of HATS-7b, a transiting Super-Neptune with a mass of 0.120 ± 0.012 MJ, a radius of 0.563-0.034 +0.046 RJ, and an orbital period of 3.1853 days. The host star is a moderately bright (V = 13.340 ± 0.010 mag, KS = 10.976 ± 0.026 mag) K dwarf star with a mass of 0.849 ± 0.027 M⊙, a radius of 0.815-0.035 +0.049 R⊙, and a metallicity of [Fe H] = +0.250 ± 0.080. The star is photometrically quiet to within the precision of the HATSouth measurements, has...[Show more]

dc.contributor.authorBakos, G. A.
dc.contributor.authorPenev, K.
dc.contributor.authorBayliss, Daniel
dc.contributor.authorHartman, J. D.
dc.contributor.authorZhou, Guyin (George)
dc.contributor.authorBrahm, R.
dc.contributor.authorMancini, L.
dc.contributor.authorDe Val-Borro, M.
dc.contributor.authorBhatti, Waqas
dc.contributor.authorJordan, A.
dc.contributor.authorRabus, M.
dc.contributor.authorEspinoza, N.
dc.contributor.authorCsubry, Z.
dc.contributor.authorHoward, Andrew
dc.contributor.authorFulton, B. J.
dc.contributor.authorBuchhave, L. A.
dc.contributor.authorCiceri, Simona
dc.contributor.authorHenning, T.
dc.contributor.authorSchmidt, Brian
dc.contributor.authorIsaacson, H.
dc.contributor.authorNoyes, R. W.
dc.contributor.authorMarcy, G. W.
dc.contributor.authorSuc, V.
dc.contributor.authorHowe, A. R.
dc.contributor.authorBurrows, A.
dc.contributor.authorLazar, J.
dc.contributor.authorPapp, I.
dc.contributor.authorSari, P.
dc.date.accessioned2016-02-24T22:41:28Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/98698
dc.description.abstractWe report the discovery by the HATSouth network of HATS-7b, a transiting Super-Neptune with a mass of 0.120 ± 0.012 MJ, a radius of 0.563-0.034 +0.046 RJ, and an orbital period of 3.1853 days. The host star is a moderately bright (V = 13.340 ± 0.010 mag, KS = 10.976 ± 0.026 mag) K dwarf star with a mass of 0.849 ± 0.027 M⊙, a radius of 0.815-0.035 +0.049 R⊙, 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 H2-He envelope), or 9 ± 4% (ice core and H2-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 H2-He. Based on a sample of transiting exoplanets with accurately (<20%) determined parameters, we establish approximate powerlaw 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., 0.054 MJ < Mp < 0.18 MJ).
dc.description.sponsorshipDevelopment of the HATSouth project was funded by NSF MRI grant NSF/AST-0723074, operations have been supported by NASA grants NNX09AB29G and NNX12AH91H, and follow-up observations received partial support from grant NSF/AST-1108686. A.J. acknowledges support from FONDECYT project 1130857, BASAL CATA PFB-06, and project IC120009 “Millennium Institute of Astrophysics (MAS)” of the Millenium Science Initiative, Chilean Ministry of Economy. R.B. and N.E. are supported by CONICYT-PCHA/ Doctorado Nacional. R.B. and N.E. acknowledge additional support from project IC120009 “Millenium Institute of Astrophysics (MAS)” of the Millennium Science Initiative, Chilean Ministry of Economy. V.S. acknowledges support form BASAL CATA PFB-06. Work at the Australian National University is supported by ARC Laureate Fellowship Grant FL0992131. We acknowledge the use of the AAVSO Photometric All-Sky Survey (APASS), funded by the Robert Martin Ayers Sciences Fund, and the SIMBAD database, operated at CDS, Strasbourg, France.
dc.format10 pages
dc.publisherIOP Publishing
dc.rights© 2015. The American Astronomical Society. Author/s retain copyright.
dc.sourceAstrophysical Journal, The
dc.titleHATS-7b: a hot super Neptune transiting a quiet K dwarf star
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume813
dc.date.issued2015
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.ariespublicationU3488905xPUB6828
local.type.statusPublished Version
local.contributor.affiliationBakos, G A, Princeton University
local.contributor.affiliationPenev, K., Princeton University
local.contributor.affiliationBayliss, Daniel, College of Physical and Mathematical Sciences, The Australian National University
local.contributor.affiliationHartman, J D, Princeton University
local.contributor.affiliationZhou, Guyin (George), College of Physical and Mathematical Sciences, The Australian National University
local.contributor.affiliationBrahm, R, Pontificia Universidad Catolica de Chile
local.contributor.affiliationMancini, L, Max Planck Institute for Astronomy
local.contributor.affiliationDe Val-Borro, M., Princeton University
local.contributor.affiliationBhatti, Waqas, Princeton University
local.contributor.affiliationJordan, A, Pontificia Universidad Catolica de Chile
local.contributor.affiliationRabus, M, Pontificia Universidad Catolica de Chile
local.contributor.affiliationEspinoza, N, Pontificia Universidad Catolica de Chile
local.contributor.affiliationCsubry, Z, Princeton University
local.contributor.affiliationHoward, Andrew, Institute for Astronomy, University of Hawaii-Manoa
local.contributor.affiliationFulton, B.J., University of Hawaii at Manoa
local.contributor.affiliationBuchhave, L. A. , Copenhagen University
local.contributor.affiliationCiceri, Simona, Max Planck Institut fur Astronomie
local.contributor.affiliationHenning, T, Max-Planck-Institut für Astronomie
local.contributor.affiliationSchmidt, Brian, College of Physical and Mathematical Sciences, The Australian National University
local.contributor.affiliationIsaacson, H., University of California, Berkeley
local.contributor.affiliationNoyes, R W, Harvard-Smithsonian Center for Astrophysics
local.contributor.affiliationMarcy, G. W, University of California
local.contributor.affiliationSuc, V, Pontificia Universidad Catolica de Chile
local.contributor.affiliationHowe, A.R., Princeton University
local.contributor.affiliationBurrows, A, Princeton University
local.contributor.affiliationLazar, J., Hungarian Astronomical Association
local.contributor.affiliationPapp, I., Hungarian Astronomical Association
local.contributor.affiliationSari, P., Hungarian Astronomical Association
dc.relationhttp://purl.org/au-research/grants/arc/FL0992131
local.identifier.essn1538-4357
local.bibliographicCitation.issue2
local.bibliographicCitation.startpage1
local.bibliographicCitation.lastpage10
local.identifier.doi10.1088/0004-637X/813/2/111
dc.date.updated2016-02-24T10:12:07Z
local.identifier.scopusID2-s2.0-84947933327
dcterms.accessRightsOpen Access
dc.provenancehttp://www.sherpa.ac.uk/romeo/issn/0004-637X/ Author can archive publisher's version/PDF. Publisher's version/PDF may be used on any website or authors' institutional repository (Sherpa/Romeo as of 26/9/2018).
CollectionsANU Research Publications

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