| Name | 086020 |
| Title | X-ray emission of ultracool dwarfs across the radio-loud - radio-quiet boundary |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0860200101 |
| DOI | https://doi.org/10.57780/esa-9m6xjic |
| Author | Prof Beate Stelzer |
| Description | Ongoing studies of magnetic activity at the end of the stellar main-sequence have revealed an emerging dichotomy in the X-ray and radio properties. The hetero- geneous properties of ultracool dwarfs (spectral type M7 and later) display either strong coronal-like X-rays with low radio luminosities or predominantly planet-like strong radio emissions with weak X-ray luminosities. This bifurcation is likely driven by the properties of the magnetic field and the stellar rotation. We will explicitly test this hypothesis by filling the parameter space with a TESS-selected sample: The new TESS rotation period will be complemented here with both radio and X-ray data spanning the rotation period threshold across which the dichotomy appears. |
| Publication | No observations found associated with the current proposal |
| 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 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. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2021-12-18T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2021-12-18T00:00:00Z, 086020, 18.02_20200221_1200. https://doi.org/10.57780/esa-9m6xjic |