A dataset provided by the European Space Agency

Name: AR Sco; the first white dwarf pulsarquestionMark
Published: 2017-09-30T22:00:00Z

Proposal ID	078394
Title	AR Sco; the first white dwarf pulsar?
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0783940101
DOI	https://doi.org/10.5270/esa-ye2x5w5
Principal Investigator, PI	Dr Danny Steeghs
Abstract	We recently discovered that a long-known variable star, AR Sco, is a multi-wavelength emission source that shows extraordinarily strong pulsations on a 2minute period from far ultraviolet to radio frequencies. We believe that AR Scois the first white dwarf radio pulsar, where the combination of a large fieldand rapid rotation results in the acceleration of relativistic particles thatblast the inner hemisphere of its M-dwarf companion, akin to the well-knownmili-second pulsars. We request XMM-Newton observations in order to test thisinterpretation and determine the spectral and timing properties of AR Sco.sX-ray emission. This should tell us whether there is significant accretion ontothe compact object or if other processes and emission are responsible.
Publications	A Non-thermal Pulsed X-Ray Emission of AR Scorpii \|Takata, J., Hu, C.-P., et al. \| ApJ \| 853-106 \| 2018 \| 2018ApJ...853..106T \| http://ui.adsabs.harvard.edu/#abs/2018ApJ...853..106T Modelling the broadband emission from the white dwarf binary system AR Scorpii \|Singh, K. K., Meintjes, P. J., et al. \| APh \| 123-102488 \| 2020 \| 2020APh...12302488S \| http://ui.adsabs.harvard.edu/#abs/2020APh...12302488S An X-Ray Study of the White Dwarf Binary AR Scorpii \|Takata, J., Wang, X. F., et al. \| ApJ \| 907-115 \| 2021 \| 2021ApJ...907..115T \| http://ui.adsabs.harvard.edu/#abs/2021ApJ...907..115T 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 Observations of AR Sco with Chandra and AstroSat soft X-ray telescope \|Singh, K. P., Girish, V., et al. \| JApA \| 42-83 \| 2021 \| 2021JApA...42...83S \| http://ui.adsabs.harvard.edu/#abs/2021JApA...42...83S From Active Stars to Black Holes: A Discovery Tool for Galactic X-Ray Sources \|Rodriguez, Antonio C., \| PASP \| 136-054201 \| 2024 \| 2024PASP..136e4201R \| http://ui.adsabs.harvard.edu/#abs/2024PASP..136e4201R 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	2016-09-10T15:41:41Z/2016-09-11T02:26:41Z
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	2017-09-30T22:00:00Z
Keywords	"relativistic particles", "XMM", "rapid rotation", "inner hemisphere", "ar sco", "dwarf companion", "variable star", "minute period", "compact object", "XMM-Newton", "xray emission", "radio frequencies", "xmm newton"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr Danny Steeghs, 2017, 'AR Sco; the first white dwarf pulsarquestionMark', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-ye2x5w5