NEREA is a stable, compact, high-resolution spectrometer concept for the GTC. NEREA is proposed as a general purpose instrument with a variety of science cases, however, its top level requirements are driven by two science goals in mind: i) The discovery and characterization of planets around nearby late-M type stars. Using GTC's large 10m

For ground-based optical imaging with current CCD technology, the Poisson fluctuations in source and sky background photon arrivals dominate the noise budget and are readily estimated. Another component of noise, however, is the signal from the undetected population of stars and galaxies. Using injection of artifical galaxies into images, we

This study is based on the 2.5D numerical simulations of the large-amplitude oscillations (LAOs) in the flux rope solar prominences. The prominence models with two different values of the initial shear angle and the density contrast were considered. In order to investigate the possible normal modes of the structure, the prominence was perturbed

Galaxy environment has been shown to play an important role in transforming late-type, star-forming galaxies to quiescent spheroids. This transformation is expected to be more severe for low-mass galaxies ( $M \lt 10^{10}\, \mathrm{M}_\odot$ ) in dense galaxy groups and clusters, mostly due to the influence of their past host haloes (also known as