Context: There is now growing evidence that some brown dwarfs (BDs) have very strong magnetic fields, and yet their surface temperatures are so low that the coupling is expected to be small between the matter and the magnetic field in the atmosphere. In the deeper layers, however, the coupling is expected to be much stronger. Aims: This raises the

We present RICO, a code designed to compute the ionization fraction of the universe during the epoch of hydrogen and helium recombination with an unprecedented combination of speed and accuracy. This is accomplished by training the machine learning code PICO on the calculations of a multilevel cosmological recombination code which self-consistently

We propose to observe Cyg X-1, an accreting black hole, and Sco X-1, an accreting neutron star, with a 2-hour long uninterrupted exposure each with IRAC in high time resolution modes. Their rapidly variable IR components are likely to come from relativistic jets, and these data will provide important insights into how these jets are powered by the

Los objetos transneptunianos (TNOs) son objetos helados que se mueven alrededor del Sol en órbitas más allá de la de Neptuno. Estos cuerpos, con diámetros que van desde varios metros hasta los 2000 kilómetros, pasan la mayor parte de su vida a distancias del Sol alrededor de las 40 U.A., donde las temperaturas se mantienen bajas. Los materiales que

We present results from integral field spectroscopy with the Potsdam Multi-Aperture Spectrograph of the head of the Herbig-Haro (HH) object HH202 with a spatial sampling of 1 × 1arcsec2. We have obtained maps of different emission lines, physical conditions - such as electron temperature and density - and ionic abundances from recombination and

We identify SDSS011009.09+132616.1, SDSS030308.35+005444.1, SDSS143547.87+ 373338.5 and SDSS154846.00+405728.8 as four eclipsing white dwarf plus main-sequence (WDMS) binaries from the Sloan Digital Sky Survey (SDSS), and report on follow-up observations of these systems. SDSS0110+1326, SDSS1435+3733 and SDSS1548+4057 contain DA white dwarfs, while