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

TL;DR

This study characterizes three hot Jupiters using multiband photometry, refining their physical properties, transit timings, and investigating potential additional companions or atmospheric features.

Contribution

It provides updated orbital and physical parameters for WASP-5b, WASP-44b, and WASP-46b, clarifies previous discrepancies, and analyzes their atmospheric spectra and transit timing variations.

Findings

WASP-5b and WASP-44b parameters are consistent with previous estimates.

WASP-46b shows some discrepancies and a possible atmospheric trend.

No clear evidence of additional planetary companions from transit timing variations.

Abstract

We have carried out a campaign to characterize the hot Jupiters WASP-5b, WASP-44b and WASP-46b using multiband photometry collected at the Observat\'orio 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 broad-band 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.