We propose to observe several brown dwarfs. Two such sub-stellar objects weredetected as X-ray sources for the first time recently with ROSAT. It is notknown, how brown dwarfs emit X-rays, possibly as coronal emission like verylate-type stars. In that case, we should expect a correlation of brown dwarfX-ray emission with spectral type, ie. temperature, and also with age, ie.bolometric luminosity. After the deuterium burning phase, central temperatureand, hence, temperature gradient will decrease. Hence, convection and X-rayemission may cease. Our targets, 2 fields with one brown dwarf each and onefield with several sub-stellar objects, are selected to probe a range in age andtemperature, to study cooling time-scale and internal structure of brown dwarfs.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2001-09-02T04:28:59Z/2002-04-09T19:07:20Z
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 Ralph Neuhaeuser, 2003, 'X-ray emission from brown dwarfs: A sequence of temperatures and ages', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-q53a4dj
