Extrasolar Enigmas: From Disintegrating Exoplanets to Exoasteroids
Thousands of transiting exoplanets have been discovered to date, thanks in great part to the Kepler space mission. As in all populations, and certainly in the...
Extrasolar planet detection by binary stellar eclipse timing: evidence for a third body around CM Draconis
Aims:Our objective is to elucidate the physical process that causes the observed observed-minus-calculated (O-C) behavior in the M4.5/M4.5 binary CM Dra and to...
Extreme emission-line galaxies in SDSS - I. Empirical and model-based calibrations of chemical abundances
Local star-forming galaxies show properties that are thought to differ from galaxies in the early Universe. Among them, the ionizing stellar populations and the...
Extreme emission-line galaxies out to z ~ 1 in zCOSMOS. I. Sample and characterization of global properties
Context. The study of large and representative samples of low-metallicity star-forming galaxies at different cosmic epochs is of great interest to the detailed...
Aims: We aim to characterize the multiwavelength emission from Markarian 501 (Mrk 501), quantify the energy-dependent variability, study the potential multiband...
Extreme magnification of an individual star at redshift 1.5 by a galaxy-cluster lens
Galaxy-cluster gravitational lenses can magnify background galaxies by a total factor of up to 50. Here we report an image of an individual star at redshift z =...
Extreme mass ratios and fast rotation in three massive binaries
The origin of rapid rotation in massive stars remains debated, although binary interactions are now often advocated as a cause. However, the broad and shallow...
Extreme nitrogen enrichment in the asymmetrical planetary nebulae M1-75
In the framework of the morphological survey of northern sky planetary nebulae, in progress at the IAC we investigate in detail those nebulae that show...