Based on a dedicated XMM-Newton monitoring campaign started in 2015 we haverecently revealed an X-ray activity cycle on the young solar-like star epsilonEri. From 2014 - 2017 the X-ray and the CaII emission of eps Eri changed in asynchronized way with the 3-yr period of the Ca S-index that dominated thechromospheric variability of the star for the last two decades. Then, in 2018, adrastic change set in\: Both the S-index and the X-ray emission appear to haveswitched to a lower average activity level, and whether X-ray and CaII emissionare still cyclic and in phase is unclear. We propose to examine the long-termevolution of eps Eri.s X-ray cycle during an important change in its activitystate with continued monitoring for 2 x 5 ks.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2021-08-07T02:58:24Z/2022-01-18T03:23:50Z
Version
19.17_20220121_1250
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.
European Space Agency, Prof Beate Stelzer, 2023, 'The changing activity cycle of the young solar-like star epsilon Eridani', 19.17_20220121_1250, European Space Agency, https://doi.org/10.57780/esa-v6cd1lu
