This section includes scientific and technological news from the IAC and its Observatories, as well as press releases on scientific and technological results, astronomical events, educational projects, outreach activities and institutional events.

  • Distribution of red luminous galaxies and the corresponding cosmic web at redshift 0.4-0.7 using 10 redshift snapshots to describe the cosmic evolution in the computations (left panel; galaxies and the underlying cosmic web in red and grey, respectively). The primordial density fluctuations at redshift 100 are shown in the right panel. It is shown how the survey mask and radial selection effects are considered and the whole volume in the box is sampled with Bayesian models.

    We present COSMIC BIRTH (COSMological Initial Conditions from Bayesian Inference Reconstructions with THeoretical models): an algorithm to reconstruct the primordial and evolved cosmic density fields from galaxy surveys on the light-cone. The displacement and peculiar velocity fields are obtained from forward modelling at different redshift snapshots given some initial cosmic density field within a Gibbs-sampling scheme. This allows us to map galaxies, observed in a light-cone, to a single high redshift and hereby provide tracers and the corresponding survey completeness in Lagrangian space

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  • Firma acuerdo IAC y CNRS

    El Instituto de Astrofísica de Canarias (IAC) y el Centre National de la Recherche Scientifique (CNRS), el mayor organismo público de investigación de Francia, firmaron ayer, reunidos por videoconferencia y en el marco de las actividades de la XXVI Cumbre Hispano-Francesa, un acuerdo por el que se establece la creación del primer laboratorio internacional del CNRS en territorio español. Firmaron el convenio el Dr. Guy Perrin, director del Institut National des Sciences de l'Univers (INSU) del CNRS, y el Prof. Rafael Rebolo, director del IAC, en presencia de otros miembros directivos y

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  • Artist’s conception of waves trapped between the surface of a sunspot (lower image, taken with GREGOR/GFPI) and the transition region (upper image, by courtesy of NASA/SDO and AIA). Credit: Gabriel Pérez Díaz, SMM (IAC).

    Umbral flashes are sudden brightenings commonly visible in the core of some chromospheric lines. Theoretical and numerical modeling suggests that they are produced by the propagation of shock waves. According to these models and early observations, umbral flashes are associated with upflows. However, recent studies have reported umbral flashes in downflowing atmospheres. We aim to understand the origin of downflowing umbral flashes. We explore how the existence of standing waves in the umbral chromosphere impacts the generation of flashed profiles. We performed numerical simulations of wave

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  • Artistic recreation of a hypothetical exoplanet with artificial lights on the night side. Credit: Rafael Luis Méndez Peña/

    A researcher at the Instituto de Astrofísica de Canarias (IAC) is the lead author of a study with proposals for “technosignatures” -evidence for the use of technology or industrial activity in other parts of the Universe- for future NASA missions. The article, published in the specialized journal Acta Astronautica, contains the initial conclusions of a meeting of experts in the search for intelligent extraterrestrial life, sponsored by the space agency to gather advice about this topic.

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  • Ilustración del 8 de marzo: Día Internacional de la Mujer. Crédito: Inés Bonet (IAC).

    “Las mujeres sostienen la mitad del cielo”, dice un proverbio chino y máxima muy presente en el Instituto de Astrofísica de Canarias (IAC), que un año más se suma a la celebración del 8 de Marzo, Día Internacional de la Mujer. Y lo hace con una serie de actividades que, entre otros fines, buscan reivindicar el papel de las mujeres de distintos perfiles y ámbitos -investigación, enseñanza, instrumentación, divulgación, servicios informáticos, instalaciones telescópicas y administración- que trabajan en este centro.

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  • Artistic impression of the surface of Gliese 486 b. Credit: RenderArea.

    We detect a transiting rocky planet with an orbital period of 1.467 days around the nearby red dwarf star Gliese 486. The planet Gliese 486 b is 2.81 Earth masses and 1.31 Earth radii, a composition similar to that of Venus or Earth, as determined from exquisite radial velocity data and photometric light curves. The host star is at a distance of 26 light-years, very bright, and observable from both hemispheres of Earth. The stellar and planet properties indicate that despite the hot surface temperatures it is possible that the planet conserved part of its original atmosphere, making it an

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