| Name | 076038 |
| Title | Calibrating the time-evolution of the high-energy emissions of GKM stars |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0760380101 |
| DOI | https://doi.org/10.5270/esa-1o0a8mv |
| Author | European Space Agency |
| Description | The time-evolution of X-ray to UV stellar fluxes is key to understand planetary atmospheres via effects such as photochemistry and evaporation. While the flux evolution of solar-type stars is well understood, this is not the case of K and M stars. Our approach is to determine the variation of L_x with age for KM stars by observing wide pairs with a white dwarf that serves as a chronometer. Here we plan to nail down the typical X-ray emission level at an age of virgul4 Gyr. We propose very deep X-ray observations of 3 M stars, reaching the lowest X-ray emission levels observed in volume-limited M dwarf samples of unknown age. Comparison with the distribution in a volume-limited sample will allow us to estimate the fraction of M dwarfs younger than 4 Gyr. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2015-11-28T19:54:22Z/2015-12-18T01:52:58Z |
| Version | 17.56_20190403_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 | 2017-01-05T23:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2017, Calibrating The Time-Evolution Of The High-Energy Emissions Of Gkm Stars, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-1o0a8mv |