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

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    M. Mallonn, Leibniz Inst Astrophys Potsdam AIP, I. Bernt, Leibniz Inst Astrophys Potsdam AIP, E. Herrero, CSIC IEEC, Autonomous University of Barcelona, Consejo Superior de Investigaciones Cientificas (CSIC), Inst Ciencies Espai, S. Hoyer, Instituto de Astrofísica de Canarias, Univ La Laguna, Universidad de la Laguna, Dept Astrofis, J. Kirk, Univ Warwick, University of Warwick, Dept Phys, P. J. Wheatley, Univ Warwick, University of Warwick, Dept Phys, M. Seeliger, Univ Observ Jena, F. Mackebrandt, Leibniz Inst Astrophys Potsdam AIP,
  • C. von Essen
  • K. G. Strassmeier, Leibniz Inst Astrophys Potsdam AIP, T. Granzer, Leibniz Inst Astrophys Potsdam AIP, A. Kuenstler, Leibniz Inst Astrophys Potsdam AIP, V. S. Dhillon, Univ Sheffield, University of Sheffield, Dept Phys & Astron, T. R. Marsh, Univ Warwick, University of Warwick, Dept Phys, 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

    Research areas

  • 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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