Extensive Swift X-ray monitoring of novae has revealed unexpected variability onthe rise to X-ray maximum in all novae with extensive monitoring but the causeremains elusive. Only a long XMM exposure during this early variability phaseallows RGS time evolution studies to fully investigate possible causes such asvariations in absorption, intrinsic brightness, or temperature. We propose XMMtime totalling 145ks for two triggered observations\: a 100ks observationtriggered during the early X-ray variability phase with <2d response and asecond 45ks observation with >1week response time during the later SSS phase tofind what has changed to make the variations stop. We will search bothobservations for transient short-period oscillations.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2021-09-15T11:07:41Z/2021-10-04T19:19:17Z
Version
21.23_20231215_1101
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.
European Space Agency, Dr Jan-Uwe Ness, 2022, 'High-amplitude variations during early SSS phase in novae', 21.23_20231215_1101, European Space Agency, https://doi.org/10.57780/esa-nji91jo
