| Proposal ID | 086020 |
| Title | X-ray emission of ultracool dwarfs across the radio-loud - radio-quiet boundary |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0860200101 |
| DOI | https://doi.org/10.57780/esa-9m6xjic |
| Principal Investigator, PI | Prof Beate Stelzer |
| Abstract | Ongoing studies of magnetic activity at the end of the stellar main-sequencehave revealed an emerging dichotomy in the X-ray and radio properties. Thehetero- geneous properties of ultracool dwarfs (spectral type M7 and later)display either strong coronal-like X-rays with low radio luminosities orpredominantly planet-like strong radio emissions with weak X-ray luminosities.This bifurcation is likely driven by the properties of the magnetic field andthe stellar rotation. We will explicitly test this hypothesis by filling theparameter space with a TESS-selected sample: The new TESS rotation period willbe complemented here with both radio and X-ray data spanning the rotation periodthreshold across which the dichotomy appears. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2020-06-22T23:51:37Z/2020-11-19T00:45:24Z |
| Version | 18.02_20200221_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 | 2021-12-18T00:00:00Z |
| Last Update | 2025-08-04 |
| Keywords | "sample \:", "predominantly planet", "ultracool dwarfs", "emerging dichotomy", "magnetic activity", "magnetic field", "stellar main sequence", "radio emissions", "dichotomy appears", "radio properties", "x ray emission", "weak xray luminosities", "rotation period threshold", "low radio luminosities", "parameter space", "tess rotation period", "M7", "xray data spanning", "explicitly test", "hetero geneous properties", "stellar rotation" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Prof Beate Stelzer, 2021, 'X-ray emission of ultracool dwarfs across the radio-loud - radio-quiet boundary', 18.02_20200221_1200, European Space Agency, https://doi.org/10.57780/esa-9m6xjic |