Broad-band spectrophotometry of HAT-P-32 b: search for a scattering signature in the planetary spectrum

Publication: Research - peer-reviewJournal article

DOI

  • M. Mallonn
    M. MallonnLeibniz Inst Astrophys Potsdam AIP
  • I. Bernt
    I. BerntLeibniz Inst Astrophys Potsdam AIP
  • E. Herrero
    E. HerreroCSIC IEEC, Autonomous University of Barcelona, Consejo Superior de Investigaciones Cientificas (CSIC), Inst Ciencies Espai
  • S. Hoyer
    S. HoyerInst Astrofis Canarias, Instituto de Astrofisica de CanariasUniv La Laguna, Universidad de la Laguna, Dept Astrofis
  • J. Kirk
    J. KirkUniv Warwick, University of Warwick, Dept Phys
  • P. J. Wheatley
    P. J. WheatleyUniv Warwick, University of Warwick, Dept Phys
  • M. Seeliger
    M. SeeligerUniv Observ Jena
  • F. Mackebrandt
    F. MackebrandtLeibniz Inst Astrophys Potsdam AIP
  • C. von Essen
  • K. G. Strassmeier
    K. G. StrassmeierLeibniz Inst Astrophys Potsdam AIP
  • T. Granzer
    T. GranzerLeibniz Inst Astrophys Potsdam AIP
  • A. Kuenstler
    A. KuenstlerLeibniz Inst Astrophys Potsdam AIP
  • V. S. Dhillon
    V. S. DhillonUniv Sheffield, University of Sheffield, Dept Phys & Astron
  • T. R. Marsh
    T. R. MarshUniv Warwick, University of Warwick, Dept Phys
  • J. Gaitan
    J. Gaitan

Multicolour broad-band transit observations offer the opportunity to characterize the atmosphere of an extrasolar planet with small- to medium-sized telescopes. One of the most favourable targets is the hot Jupiter HAT-P-32 b. We combined 21 new transit observations of this planet with 36 previously published light curves for a homogeneous analysis of the broad-band transmission spectrum from the Sloan u' band to the Sloan z' band. Our results rule out cloud-free planetary atmosphere models of solar metallicity. Furthermore, a discrepancy at reddest wavelengths to previously published results makes a recent tentative detection of a scattering feature less likely. Instead, the available spectral measurements of HAT-P-32 b favour a completely flat spectrum from the near-UV to the near-IR. A plausible interpretation is a thick cloud cover at high altitudes.

Original languageEnglish
JournalRoyal Astronomical Society. Monthly Notices
Volume463
Issue number1
Pages (from-to)604-614
Number of pages11
ISSN0035-8711
DOIs
StatePublished - 21 Nov 2016

    Keywords

  • techniques: photometric, planets and satellites: atmosphere, planets and satellites: individual: HAT-P-32 b, EXOPLANET GJ 1214B, OPTICAL-TRANSMISSION SPECTRUM, TRANSITING EXTRASOLAR PLANETS, OR-EQUAL-TO, RAYLEIGH-SCATTERING, ECLIPSING BINARIES, MODEL ATMOSPHERES, HD 189733B, BLUE SKY, NEAR-IR

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ID: 105112592