Instrument details and configurations


ESPaDOnS is a bench-mounted high-resolution echelle spectrograph/spectropolarimeter fibre-fed from a Cassegrain module including calibration and guiding facilities, as well as an optional polarisation analyser. It can deliver:

Main scientific drivers

With ESPaDOnS, astronomers can now address with unprecedented detail a broad range of important issues in stellar physics, from stellar magnetic fields to extrasolar planets, from stellar surface inhomogeneities and surface differential rotation to activity cycles and magnetic braking, from microscopic diffusion to turbulence, convection and circulation in stellar interiors, from abundances and pulsations in stellar atmospheres to stellar winds and accretion discs, from the early phases of stellar formation to the late stages of stellar evolution, from extended circumstellar environments to distant interstellar medium. An ADS list of selected studies published in refereed journals since 2002 on these various topics by the ESPaDOnS community is available here.

The image on the right (obtained by Moira Jardine and collaborators) illustrates one of such scientific programs. It shows a 3D magnetospheric configuration extrapolated from a magnetic surface map of the young ZAMS star AB Doradus, derived from spectropolarimetric data such as those ESPaDOnS can secure. The image shows X-ray emission from the high temperature plasma filling the closed magnetospheric loops (the stellar surface being depicted here as the central dark sphere in which the loops are anchored).

Brief instrument description

ESPaDOns consists of two distinct units, each located at a different place with respect to the telescope: The specific role of these four modules is described below:

Instrument configurations

To keep ESPaDOnS as simple as possible, it has been designed as a 'point and shoot' instrument with very few different configurations. Only three choices are available:

© Jean-François Donati, last update 2006 Jan. 10