| Proposal ID | 050086 |
| Title | The Origin of CAL 83 X-Ray Off-States |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0500860201 |
| DOI | https://doi.org/10.5270/esa-q97s5o8 |
| Principal Investigator, PI | Dr Thierry Lanz |
| Abstract | The close binary supersoft X-ray source CAL 83 is a most promising candidate ofSN Ia progenitors. Our XMM-Newton and Chandra observations show a massive whitedwarf, exhibit large amplitude short-term variations of the X-ray flux, andestablish definitively its recurrent nature. We propose now to conduct acampaign with EPIC and OM on XMM-Newton to substantiate the correlation betweenX-ray and optical variations on a short, medium, and long-term basis. Thiscampaign will trace the physical relation between the accretion disk and thewhite dwarf, and will discriminate between several models explaining the originof CAL 83 off-states. XMM-Newton data will offer unique and timely insights intoaccretion and unstable nuclear burning during the last evolution stages of SN Ia progenitors. |
| Publications |
|
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2007-05-13T22:03:32Z/2008-04-21T05:42:20Z |
| 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 | 2009-06-10T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "cal 83", "optical variations", "physical relation", "EPIC", "accretion disk", "models explaining", "unstable nuclear burning", "xmm newton", "term basis", "massive white dwarf", "XMM-Newton", "xray flux", "cal 83 xray", "xmm newton data", "XMM", "timely insights", "white dwarf" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Thierry Lanz, 2009, 'The Origin of CAL 83 X-Ray Off-States', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-q97s5o8 |