|Title||DOES QUIESCENT CORONAL ACTIVITY EXIST IN LATE M-L DWARFS?|
|Author||Dr RACHEL OSTEN|
|Description||We request X-ray observations of two late M-early L dwarfs --- LHS 2065 (M9), and Kelu-1 (L2). The picture of activity becomes increasing blurred as one moves past spectral type M8. Several cool objects have been shown to maintain Halpha and transition region fluxes at the level evident in early M dwarfs. There is suggestive evidence that quiescent X-ray emission from M dwarfs as late as M8 can also be maintained at a comparable level. Our deep exposures with XMM-Newton are designed to improve the current upper limits on X-ray and radio quiescent emission for these two active cool objects, and test the hypotheses that (1) similar heating mechanisms are operating in these objects and earlier M dwarfs, and (2) X-rays can be formed in active cool brown dwarfs such as Kelu-1.|
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|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|Mission Description||The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2005-06-13T00:00:00Z, 020386, 17.56_20190403_1200. https://doi.org/10.5270/esa-eopvi0u|