A dataset provided by the European Space Agency

Name 050086
Title The Origin of CAL 83 X-Ray Off-States


DOI https://doi.org/10.5270/esa-q97s5o8
Author Dr Thierry Lanz
Description The close binary supersoft X-ray source CAL 83 is a most promising candidate of SN Ia progenitors. Our XMM-Newton and Chandra observations show a massive white dwarf, exhibit large amplitude short-term variations of the X-ray flux, and establish definitively its recurrent nature. We propose now to conduct a campaign with EPIC and OM on XMM-Newton to substantiate the correlation between X-ray and optical variations on a short, medium, and long-term basis. This campaign will trace the physical relation between the accretion disk and the white dwarf, and will discriminate between several models explaining the origin of CAL 83 off-states. XMM-Newton data will offer unique and timely insights into accretion and unstable nuclear burning during the last evolution stages of SN Ia progenitors.
Publication No observations found associated with the current proposal
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 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 2009-06-10T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2009-06-10T00:00:00Z, 050086, 17.56_20190403_1200. https://doi.org/10.5270/esa-q97s5o8