|Title||Probing the nature of the circumstellar environment around periastron|
|Author||Dr Sebastian Drave|
|Description||The mass transfer and accretion mechanisms in SFXTs are key questions to place them in the wider context of HMXB systems. Current theories centre on mass transfer via isotropic but inhomogeneous (.clumpy.) winds, but some systems also show evidence of disk-like structures around the supergiant, analogous to those seen in Be-X-ray binaries. We propose a campaign of periastron observations of 2 SFXTs with known ephemerides. Simultaneous INTEGRAL-XMM observations will measure the instantaneous accretion rate, emission spectrum and time variability generated on and around the neutron star. Continuous broad-band observations around periastron yield the best opportunity to use the neutron star as a direct probe of the circumstellar wind environment.|
|Publication||The Million Optical - Radio-X-ray Associations (MORX) Catalogue . Flesch, Eric W., . PASA . 33-52 . 2016 . 2016PASA...33...52F ,
The accretion environment of supergiant fast X-ray transients probed with XMM-Newton . Bozzo, E., Bernardini, F., et all. . A&A . 608-128 . 2017 . 2017A&A...608A.128B ,
Supergiant fast X-ray transients versus classical supergiant high mass X-ray binaries: Does the difference lie in the companion wind? . Pradhan, P., Bozzo, E., . A&A . 610-50 . 2018 . 2018A&A...610A..50P ,
Supergiant Fast X-ray Transients uncovered by the EXTraS project: flares reveal the development of magnetospheric instability in accreting neutron stars . Sidoli, Lara, Postnov, Konstantin A., et all. . MNRAS . 487-420 . 2019 . 2019MNRAS.487..420S ,
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2015-11-04T23:00:00Z, 072837, 17.56_20190403_1200. https://doi.org/10.5270/esa-bjkuzeb|