A dataset provided by the European Space Agency

Name 076038
Title Calibrating the time-evolution of the high-energy emissions of GKM stars


DOI https://doi.org/10.5270/esa-1o0a8mv
Author Dr Ignasi Ribas
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, 2017-01-05T23:00:00Z, 076038, 17.56_20190403_1200. https://doi.org/10.5270/esa-1o0a8mv