Context. Departures from local thermodynamic equilibrium (LTE) distort the calcium abundance derived from stellar spectra in various ways, depending on the lines used and the stellar atmospheric parameters. The collection of atomic data adopted in non-LTE (NLTE) calculations must be sufficiently complete and accurate. Aims: We derive NLTE

We report improved masses, radii, and densities for four planets in two bright M-dwarf systems, K2-3 and GJ3470, derived from a combination of new radial velocity and transit observations. Supplementing K2 photometry with follow-up Spitzer transit observations refined the transit ephemerides of K2-3 b, c, and d by over a factor of 10. We analyze

In the version of this Letter originally published, the caption of Fig. 2 incorrectly said J = 3-2; it should have said J = 2-1. This has now been corrected.

This paper reviews some of the main results of archaeoastronomical fieldworks carried out in sanctuaries and temples belonging to the Iron Age Iberian culture. Most of this work has been done in close collaboration with archaeologists. The orientation pattern of the Iberian sacred buildings seems to be related to the rising sun. A significant

We report an analysis of the first known β Cep pulsator observed by the Transiting Exoplanet Survey Satellite (TESS) mission, the runaway star PHL 346 = HN Aqr. The star, previously known as a singly periodic pulsator, has at least 34 oscillation modes excited, 12 of those in the g-mode domain and 22 p modes. Analysis of archival data implies that

We present the detection of a sample of galaxies which are extremely faint in the optical and near-infrared but bright at mid-infrared wavelengths. This population of galaxies, missed by the deepest HST surveys such as CANDELS or Hubble Frontier Fields, are considerably bright in IRAC. The bulk of the sample (65%) is located in a 2σ region around