Thursday, October 5, 2017

Muti-band characterization of the hot Jupiters: WASP-5b, WASP-44b, and WASP-46b

Muti-band characterization of the hot Jupiters: WASP-5b, WASP-44b, and WASP-46b

Authors:


Moyano et al

Abstract:

We have carried out a campaign to characterize the hot Jupiters WASP-5b, WASP-44b, and WASP-46b using multi-band photometry collected at the Observat├│rio do Pico Dos Dias in Brazil. We have determined the planetary physical properties and new transit ephemerides for these systems. The new orbital parameters and physical properties of WASP-5b and WASP-44b are consistent with previous estimates. In the case of WASP-46b, there is some quota of disagreement between previous results. We provide a new determination of the radius of this planet and help clarify the previous differences. We also studied the transit time variations including our new measurements. No clear variation from a linear trend was found for the systems WASP-5b and WASP-44b. In the case of WASP-46b, we found evidence of deviations indicating the presence of a companion but statistical analysis of the existing times points to a signal due to the sampling rather than a new planet. Finally, we studied the fractional radius variation as a function of wavelength for these systems. The broadband spectrums of WASP-5b and WASP-44b are mostly flat. In the case of WASP-46b we found a trend, but further measurements are necessary to confirm this finding.

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