| Proposal ID | 030143 |
| Title | Quiescent X-ray emission from ultracool dwarf 1RXS J115928.5-524717 |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0301430101 |
| DOI | https://doi.org/10.5270/esa-h0rs7t3 |
| Principal Investigator, PI | Dr Valeri Hambaryan |
| Abstract | We propose to perform XMM-Newton observations of a very low mass star 1RXS115928.5-524717. Given the sensitivity of XMM-Newton over previous missions, weare confident that coronal X-ray emission can now be detected in the very lowestmass stars and substellar objects known. Therefore, the objective of thisproposal is to make such detection and thereby establish the existence ofmagnetic activity at the very bottom of the main sequence and beyond. Our targetis recently discovered a previously unknown, high proper motion($approx$,1.1$^{arcsec}$,yr$^{-1}$) member of the immediate solar neighborhood:a very low mass star (Sp type M9) detected only during an X-ray bright flare ofduration 1.5-2 hours with ROSAT All-Sky Survey. |
| Publications |
|
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2006-01-01T19:12:15Z/2006-01-02T05:54:13Z |
| Version | 21.51_20241115_1113 |
| 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 | 2007-01-24T00:00:00Z |
| Last Update | 2026-07-09 |
| Keywords | "M9", "proper motion", "ROSAT", "xray bright flare", "XMM-Newton", "main sequence", "perform xmm newton", "quiescent xray emission", "solar neighborhood", "magnetic activity", "sky survey", "XMM", "coronal xray emission", "substellar objects", "xmm newton", "lowest mass stars" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Valeri Hambaryan, 2007, 'Quiescent X-ray emission from ultracool dwarf 1RXS J115928.5-524717', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-h0rs7t3 |
| Rights | Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license. |