A dataset provided by the European Space Agency

Name 086019
Title The changing activity cycle of the young solar-like star epsilon Eridani


DOI https://doi.org/10.57780/esa-oeg31cx
Author Prof Beate Stelzer
Description Based on a dedicated XMM-Newton monitoring campaign started in 2015 we have
recently revealed an X-ray activity cycle on the young solar-like star eps Eri.
From 2014 - 2017 the X-ray and the Ca II emission of eps Eri changed in a syn-
chronized way with the 3-yr period of the Ca S-index that dominated the chromo-
spheric variability of the star for the last two decades. Then, in 2018, a
drastic change set in\: Both S-index and X-ray emission appear to change now on
about half the previous timescale, the S-index is significantly lower than
before, and whether X-ray and Ca II variability are still in phase is unclear.
We propose to examine the long-term evolution of epsEri.s X-ray cycle during an
important change in its activity state with continued monitoring for 4 x 5 ks in AO19.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, RGS1, RGS2
Temporal Coverage 2020-07-22T17:57:15Z/2021-01-17T17:19:19Z
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 2022-02-04T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Prof Beate Stelzer, 2022, 086019, 18.02_20200221_1200, European Space Agency, https://doi.org/10.57780/esa-oeg31cx