Na I and Hα absorption features in the atmosphere of MASCARA-2b/KELT-20b
We used the HARPS-North high resolution spectrograph (ℛ = 115 000) at Telescopio Nazionale Galileo (TNG) to observe one transit of the highly irradiated planet...
Naked emergence of an anti-Hale active region. I. Overall evolution and magnetic properties
Aims: In order to understand the emergence of the active region, we investigate the emerging process and magnetic properties of a naked anti-Hale active region...
Nanodiamond Dust and the Far-Ultraviolet Quasar Break
We explore the possibility that the steepening observed shortward of 1000 Å in the energy distribution of quasars may result from absorption by dust, being...
Narrow band 1 micron-4 micron infrared photometry of 176 stars
Observations of 176 stars have been obtained by filter photometry over the 1-4 micron range at the Observatorio del Teide in Tenerife. Measurements for Jn, Kn...
Narrow band Hα photometry of the super-Earth GJ 1214b with GTC/OSIRIS tunable filters
Aims: The super-Earth planet GJ 1214b has recently been the focus of several studies, which use the transit spectroscopy technique to determine the nature of...
Narrow band survey for intragroup light in the Leo HI cloud. Constraints on the galaxy background contamination in imaging surveys for intracluster planetary nebulae
We have observed emission line objects located in a 0.26 deg2 field in the M 96 (Leo) group, coincident with the intergalactic HI cloud. The emission line...
In 2018, Solar Cycle 24 entered into a solar minimum phase. During this period, 11 million zenithal night sky brightness (NSB) data were collected at different...
Nature of a shell of young stars in the outskirts of the Small Magellanic Cloud
Context. Understanding the evolutionary history of the Magellanic Clouds requires an in-depth exploration and characterization of the stellar content in their...