Abstract:
The most challenging limitation in transit photometry arises from the noises in the photometric signal. In particular,
the ground-based telescopes are heavily affected by the noise due to perturbation in the Earth’s atmosphere. Use of
telescopes with large apertures can improve the photometric signal-to-noise ratio to a great extent. However,
detecting a transit signal out of a noisy light curve of the host star and precisely estimating the transit parameters
call for various noise reduction techniques. Here, we present multiband transit photometric follow-up observations
of five hot Jupiters e.g., HAT-P-30 b, HAT-P-54 b, WASP-43 b, TrES-3 b, and XO-2 N b, using the 2 m
Himalayan Chandra Telescope at the Indian Astronomical Observatory, Hanle, and the 1.3 m J. C. Bhattacharya
Telescope at the Vainu Bappu Observatory, Kavalur. Our critical noise treatment approach includes techniques
such as wavelet denoising and Gaussian process regression, which effectively reduce both time-correlated and
time-uncorrelated noise components from our transit light curves. In addition to these techniques, use of our stateof-the-art model algorithms have allowed us to estimate the physical properties of the target exoplanets with a
better accuracy and precision compared to the previous studies.
