ESPaDOnS: Overall presentation

© E.P. Jacobs

Brief description

ESPaDOnS is an ongoing Franco-Canadian project for a new bright time instrument, a cross-dispersed échelle spectrograph/spectropolarimeter, for general community use at the Canada-France-Hawaii Telescope (CFHT). This instrument will be able to obtain:

The spectrograph, being built at the moment, is bench-mounted and fed by an optical fibre link from a Cassegrain module containing all calibration facilities and the optional polarisation analyser, making it possible to have extremely good wavelength stability and minimal instrumental polarisation.

Scientific interest

ESPaDOnS will be a unique instrument worldwide in polarimetric mode, competitive with similar instruments on 8 m class telescopes in non-polarimetric mode. With the new facility, French and Canadian astronomers will be able to address with unprecedented detail a broad range of important issues in stellar physics, from studies of stellar interiors, to investigations of stellar atmospheres, stellar surfaces, stellar magnetic fields, and to observations of circumstellar environments and extrasolar planets.

Additional information

More information on ESPaDOnS can be found below on:

Any questions/comments/suggestions about either this page or the ESPaDOnS project should be addressed to

Related publications

Donati J.-F. , ``ESPaDOnS: An Echelle SpectroPolarimetric Device for the Observation of Stars at CFHT'', in: Trujillo Bueno J., Sanchez Almeida J. (eds.), proceedings of the Solar Polarisation Workshop #3 (2003). ASP Conf. Series (in press).

Donati J.-F. , Catala C., Landstreet J.D., ``ESPaDOnS: An Echelle SpectroPolarimetric Device for the Observation of Stars at CFHT'', in: Martin P., Rucinski S. (eds.), `proceedings of the ``fifth CFHT users' meeting'' (1998). p. 50

© Jean-François Donati, last update on 2003 Jun. 16