EXORs are extreme T Tauri stars that experience major UV-optical eruptions (3-5mag) that last about a year. These recurring outbursts driven by high accretionrates assist in dispersal of the circumstellar disk and the large X-ray-UV fluxinjected into the local environment modifies the physical and chemical history,influencing planet formation and time scales. Little X-ray data exists on thesestars during either quiescent or outburst phases, so basic details such as howmuch X-ray flux is produced during eruption is unknown. We will characterize theX-ray properties of 6 EXORs in their quiescent phase. If an eruption of anyknown EXOR occurs during AO6, a high-quality spectrum will be obtained.Contrasting quiescent and outburst properties provides crucial insight into the physics.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2007-08-13T11:28:50Z/2007-09-11T15:51:42Z
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.
European Space Agency, Dr Guy Stringfellow, 2008, 'Defining Pre-Outburst and Post-Outburst Characteristics of Eruptive Young Stars', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-x9oen4l
