|Title||The puzzling activity cycle of the planet host star iota Hor|
|Author||Dr Jorge Sanz-Forcada|
|Description||The discovery of a coronal cycle in iota Hor represents the shortest observed to date, in good agreement with chromospheric observations. A longer term trend seems to modulate the outcome of the 1.6 yr cycle. The most recent data could indicate that the minimum of a long term cycle has been reached and the activity could be increasing in the next years. This might offer the unique possibility to observe for the first time a double coronal cycle similar to those observed in the chromosphere of other stars. The iota Hor cycle might be the paradigm of the first activity cycles in the life of a solar-like star; besides, a jovian planet orbits the star at 0.9 a.u. We intend to complete the coverage of a new coronal cycle, and to monitor the interplay with a possible longer term cycle.|
|Publication||X-ray variability of cool stars: Magnetic activity and accretion . Stelzer, B., . AN . 338-195 . 2017 . 2017AN....338..195S ,
Multi-wavelength variability of the young solar analog u03b9 Horologii. X-ray cycle, star spots, flares, and UV emission . Sanz-Forcada, J., Stelzer, B., et all. . A&A . 631-45 . 2019 . 2019A&A...631A..45S ,
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2016-02-23T23:00:00Z, 074402, 17.56_20190403_1200. https://doi.org/10.5270/esa-spdsab6|