# Photometric Investigation of Hot Exoplanets: TrES-3b and Qatar-1b

## TL;DR

This study presents new photometric observations and analysis of transits for hot Jupiters TrES-3b and Qatar-1b, estimating their physical properties and refining their orbital parameters.

## Contribution

It provides updated light curve solutions, physical parameters, and transit ephemerides for TrES-3b and Qatar-1b using new observational data and the WINFITTER analysis.

## Key findings

- Planet radii are estimated as 1.381 R_J for TrES-3b and 1.142 R_J for Qatar-1b.
- No significant transit timing variation detected for TrES-3b.
- Weak evidence of transit timing variation for Qatar-1b, needing further study.

## Abstract

New photometric follow-up observations of exoplanet transits of 'hot Jupiters' TrES-3b and Qatar-1b are presented. Weighted mean values of the solutions of light curves in R-fiter for both planetary systems are reported and compared with the previous results. The transit light curves were analysed using the WINFITTER code. The physical properties of the planets were estimated. The planet radii are found to be $R_p = 1.381 \pm 0.033 R_J$ for TrES-3b and $R_p = 1.142 \pm 0.025 R_J$ for Qatar-1b. Transit times and their uncertainties were also determined and a new linear ephemeris was computed for both systems. Analysis of transit times showed that a significant signal could not be determined for TrES-3b, while weak evidence was found for Qatar-1b, which might be tested using more precise future transit times.