A dataset provided by the European Space Agency

Name: The orbital period decay of HMCnc: G.W. emission vs magnetic stresses
Published: 2017-05-17T22:00:00Z

Proposal ID	078467
Title	The orbital period decay of HMCnc: G.W. emission vs magnetic stresses
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0784670101
DOI	https://doi.org/10.5270/esa-b84dp53
Principal Investigator, PI	Prof Gian Luca Israel
Abstract	HMCnc is a two white dwarfs system with the shortest orbital period (321s). TheX-ray monitoring of this unique source over the last 20 years, made it possibleto assess that the modulation is decreasing at about 1ms/yr. Two competingscenarios have been suggested for HMCnc: the direct impact model, involvingmatter accretion, and the unipolar inductor, which considers the WDs ascomponents of an electric circuit. In the former the orbital decay is expectedto be ruled by GW emission only and a second period derivative <-1E-7s/yr/yr isexpected, while in the latter magnetic stresses are expected to produce a largercomponent. The new pointing we are requesting will allow us to detect a secondperiod derivative or to set a tight upper limit, thus discerning between the two competing models.
Publications	Classification of 4XMM-DR9 sources by machine learning \|Zhang Yanxia Zhao Yongheng \| MNRAS \| 503-5263 \| 2021 \| 2021MNRAS.503.5263Z \| http://ui.adsabs.harvard.edu/#abs/2021MNRAS.503.5263Z Robust constraints on feebly interacting particles using XMM-Newton \|Luque Pedro De la Torre Balaji Shyam \| PhRvD \| 109-L101305 \| 2024 \| 2024PhRvD.109j1305L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j1305L Multimessenger search for electrophilic feebly interacting particles from supernovae \|Luque Pedro De la Torre Balaji Shyam \| PhRvD \| 109-103028 \| 2024 \| 2024PhRvD.109j3028L \| http://ui.adsabs.harvard.edu/#abs/2024PhRvD.109j3028L Importance of Cosmic-Ray Propagation on Sub-GeV Dark Matter Constraints \|De la Torre Luque Pedro Balaji Shyam \| ApJ \| 968-46 \| 2024 \| 2024ApJ...968...46D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...968...46D
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2016-04-18T08:40:58Z/2016-04-18T17:34:19Z
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.
Creator Contact	https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published	2017-05-17T22:00:00Z
Last Update	2025-01-27
Keywords	"period derivative", "electric circuit", "matter accretion", "orbital decay", "gw emission", "impact model", "tight upper limit", "magnetic stresses", "unipolar inductor", "larger component", "1e 7s", "white dwarfs system", "orbital period decay"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Prof Gian Luca Israel, 2017, 'The orbital period decay of HMCnc: G.W. emission vs magnetic stresses', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-b84dp53