| Proposal ID | 072247 |
| Title | The changing activity cycle of the planet host star HR 810 |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0722470201 |
| DOI | https://doi.org/10.5270/esa-g6l5rrn |
| Principal Investigator, PI | Dr Jorge Sanz-Forcada |
| Abstract | Activity cycles are commonly found among late type stars through thechromospheric Ca II emission. Their coronal counterpart remains elusive in mostcases, despite of the clear cycle observed in the solar corona. The shortest CaII cycle to date, 1.6 yr, was observed in HR 810. We find a coronal cycle of anintriguing shorter duration, shifted from the extrapolated chromospheric cycle.This could be the counterpart of a changing activity cycle not yet identified inthis star. The star offers also two more interesting properties: with an age ofonly virgul500 Myr and spectral type G0V it represents a young solar analog, and ajovian planet orbits the star at 0.9 a.u. We intend to complete the coverage ofa second coronal cycle, to confirm the first detection of a changing coronal cycle. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2013-05-20T03:26:30Z/2014-02-05T06:18:02Z |
| 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 | 2015-02-27T23:00:00Z |
| Keywords | "late type stars", "solar analog", "star hr 810", "solar corona", "coronal cycle", "coronal counterpart", "changing activity cycle", "spectral type g0v", "jovian planet orbits", "activity cycles", "intriguing shorter duration", "hr 810", "extrapolated chromospheric cycle", "changing coronal cycle" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Jorge Sanz-Forcada, 2015, 'The changing activity cycle of the planet host star HR 810', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-g6l5rrn |