A dataset provided by the European Space Agency

Name 069042
Title Detecting the orbital period decay of HMCnc: G.W. emission vs magnetic stresses
URL

https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0690420101

DOI https://doi.org/10.5270/esa-qyjzaur
Author Prof Gian Luca Israel
Description HMCnc is a system hosting two white dwarfs and has the shortest known orbital
period (321s). The X-ray monitoring of this unique source over the last 16
years, made it possible to assess that the modulation is steadly decreasing at
about 1ms/yr. Two competing scenarios have been suggested: the direct impact
model, involving matter accretion, and the unipolar inductor, which considers
the WDs as components of an electric circuit. In the former the orbital decay
is expected to be ruled by GW emission only with a second period derivative
of <-1E-7s/yr^2, while in the latter magnetic stresses produce a larger
component. The additional pointing will allow us to achieve a sensitivity
of -8E-8 s/yr^2, providing the way of undertanding the nature of HMCnc.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2012-10-12T23:40:21Z/2012-10-13T08:55:39Z
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 2013-10-31T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Prof Gian Luca Israel, 2013, 069042, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-qyjzaur