| Proposal ID | 067361 |
| Title | X-ray counterpart of the shortest activity cycle found to date |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0673610201 |
| DOI | https://doi.org/10.5270/esa-5kbrts4 |
| Principal Investigator, PI | Dr Jorge Sanz-Forcada |
| Abstract | Activity cycles are commonly found among late type stars through thechromospheric CaII emission. Their coronal counterpart, however, remains elusivein most cases, despite of the clear cycle observed in the solar corona, spanningas much as 1.7 dex in Lx. The recent discovery of a CaII cycle in HR 810 of just1.6 yr, the shortest to date, offers a unique opportunity to test the existenceof an X-ray counterpart of the cycle within one or at most two XMM-Newtonobserving periods. The star offers also two more attractives: with an age ofonly 500 Myr and spectral type G0V it represents a young solar analog, and aplanet of 1.9 Mj orbits the star at 0.9 a.u. We intend to make 8 snapshotsduring AO10, for a total of 40 ks, to cover 60% of the cycle starting near its lowest level of activity. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2011-05-16T22:37:22Z/2012-02-10T10:06:40Z |
| Version | 17.56_20190403_1200 |
| 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. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2013-03-03T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "solar corona", "lowest level", "activity cycles", "solar analog", "xmm newton", "chromospheric caii emission", "late type stars", "XMM-Newton", "xray counterpart", "spectral type g0v", "shortest activity cycle", "caii cycle", "XMM", "mj orbits", "cycle starting", "hr 810", "x ray counterpart", "coronal counterpart" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Jorge Sanz-Forcada, 2013, 'X-ray counterpart of the shortest activity cycle found to date', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-5kbrts4 |