| Proposal ID | 000274 |
| Title | X-ray emission from brown dwarfs: A sequence of temperatures and ages |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0002740101 |
| DOI | https://doi.org/10.5270/esa-q53a4dj |
| Principal Investigator, PI | Dr Ralph Neuhaeuser |
| Abstract | 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. |
| Publications |
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| 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. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2003-06-06T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "sub stellar objects", "bolometric luminosity", "deuterium burning phase", "cooling time scale", "late type stars", "ROSAT", "x ray emission", "spectral type", "xray emission", "xray sources", "coronal emission", "internal structure", "temperature gradient", "central temperature", "brown dwarf" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | 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 |