Broad-band spectrophotometry of HAT-P-32 b: Search for a scattering signature in the planetary spectrum
| Autor: | Mallonn, M., Bernt, I., Herrero, E., Hoyer, S., Kirk, J., Wheatley, P. J., Seeliger, M., Mackebrandt, F., von Essen, C., Strassmeier, K. G., Granzer, T., Künstler, A., Dhillon, V. S., Marsh, T. R., Gaitan, J. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stw1999 |
| Popis: | 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. Comment: 12 pages, 6 figures, accepted for publication in MNRAS |
| Databáze: | arXiv |
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