A key element to understand planetary atmospheres (Solar System and exoplanets)is the time-evolution of the flux at short wavelengths (X-ray to UV) of the hoststars. While the high-energy flux evolution is well understood for solar-typestars, this is not the case of the later K and M stars. After obtaining someunexpected results on previous AO,10, the proposed XMM-Newton observations willallow us to throw light on the behaviour of X-ray emissions along the criticalintermediate-age interval (1-6 Gyr). This will be done by measuring new GKMstars in wide binary pairs with white dwarf companions that we use aschronometers to determine reliable ages. The time-variation of coronaltemperature will provide additional diagnostics useful to both exoplanets and dynamo theory.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2012-08-14T09:03:18Z/2012-12-22T03:23:27Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
European Space Agency, Dr Ignasi Ribas, 2014, 'Calibrating the time-evolution of the high-energy emissions of GKM stars', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-1l9k9uj
