The superb depth of present ultradeep observations and next generation synoptic surveys allow us to reach sudden decrements of the galaxy surface brightness in their outer parts. These truncations are intimately linked with the expected location of the cold gas density threshold for star formation. The unexpected existence of these limits in the

http://research.iac.es/proyecto/emir/ {EMIR} is one of the first common user instruments for the GTC, the 10 meter telescope operating at the Roque de los Muchachos Observatory (La Palma, Canary Islands, Spain). EMIR has been built by a Consortium of Spanish and French institutes led by the Instituto de Astrofísica de Canarias (IAC). The instrument

The ``Proyecto Educativo con Telescopios Robóticos'' (PETeR) of the Instituto de Astrofísica de Canarias is an online inquiry-based laboratory that allows school students to carry out their own observations and research projects in astronomy using professional robotic telescopes. The availability of observing time on several telescopes, which also

It is very common in astrophysics that certain relevant parameters of the objects studied cannot be obtained directly from observations, but require numerical models that simulate the relevant physical mechanisms, often through an iterative process of trial and error. This is often lengthy and consumes a large part of the human and material

Context. Close-in, sub-stellar companions to δ Scuti type stars present a highly suitable testbed for examining how planetary-mass objects can influence stellar pulsations. Aims: We aim to constrain the mass of HD 31221 b, probe its atmosphere, and demonstrate how it affects the pulsational pattern of its host, HD 31221. Methods: We made use of the

Carbon monoxide (CO) is predicted to be the dominant carbon-bearing molecule in giant planet atmospheres and, along with water, is important for discerning the oxygen and therefore carbon-to-oxygen ratio of these planets. The fundamental absorption mode of CO has a broad, double-branched structure composed of many individual absorption lines from 4