| Name | 072247 |
| Title | The changing activity cycle of the planet host star HR 810 |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0722470201 |
| DOI | https://doi.org/10.5270/esa-g6l5rrn |
| Author | European Space Agency |
| Description | Activity cycles are commonly found among late type stars through the chromospheric Ca II emission. Their coronal counterpart remains elusive in most cases, despite of the clear cycle observed in the solar corona. The shortest Ca II cycle to date, 1.6 yr, was observed in HR 810. We find a coronal cycle of an intriguing shorter duration, shifted from the extrapolated chromospheric cycle. This could be the counterpart of a changing activity cycle not yet identified in this star. The star offers also two more interesting properties: with an age of only virgul500 Myr and spectral type G0V it represents a young solar analog, and a jovian planet orbits the star at 0.9 a.u. We intend to complete the coverage of a second coronal cycle, to confirm the first detection of a changing coronal cycle. |
| Publication | No observations found associated with the current proposal |
| 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 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 | 2015-02-27T23:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 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 |