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arXiv · 1608.02346

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

M. Mallonn·I. Bernt·E. Herrero·S. Hoyer·J. Kirk·P. J. Wheatley·M. Seeliger·F. Mackebrandt·C. von Essen·K. G. Strassmeier·T. Granzer·A. Künstler·V. S. Dhillon·T. R. Marsh·J. Gaitan
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Abstract

Multi-colour broad-band transit observations offer the opportunity to characterise 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.

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M. Mallonn, I. Bernt, E. Herrero, S. Hoyer, J. Kirk, P. J. Wheatley, M. Seeliger, F. Mackebrandt, C. von Essen, K. G. Strassmeier, T. Granzer, A. Künstler, V. S. Dhillon, T. R. Marsh, J. Gaitan. 2016-08-08. Broad-band spectrophotometry of HAT-P-32 b: Search for a scattering signature in the planetary spectrum. https://doi.org/10.1093/mnras%2Fstw1999

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