A dataset provided by the European Space Agency

Name: A First Look at a Short Period, Extremely Deep-Eclipsing Polar
Published: 2012-09-29T00:00:00Z
License: https://creativecommons.org/licenses/by-nc/3.0/igo

Proposal ID	067342
Title	A First Look at a Short Period, Extremely Deep-Eclipsing Polar
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0673420101
DOI	https://doi.org/10.5270/esa-0fybdc6
Principal Investigator, PI	Prof Paolo Coppi
Abstract	We request exploratory follow-up of a new short period (95 min.), white dwarfbinary, likely a polar with no accretion disk, that shows one of the deepestoptical eclipses known (>5.7 mag). Such binaries are rare but valuable as thesystems inclination is strongly constrained; high time-resolutionspectrophotometry, especially in and out of eclipse, allows tomography of theaccretion flow and direct measurement of the radii of the white dwarf and itscompanion. This system shows no J band eclipse, i.e., it must have an unusuallycool, low mass secondary, an M8+ dwarf. This combined with the short periodsuggests we may have a magnetic period bouncer, a late binary evolutionarystage theoretically predicted to be common but difficult to detect in practice.
Publications	Serendipitous UV source catalogues for 10 years of XMM and 5 years of Swift \|Yershov V. N. \| Ap&SS \| 354-97 \| 2014 \| 2014Ap&SS.354...97Y \| http://ui.adsabs.harvard.edu/#abs/2014Ap&SS.354...97Y The Million Optical - Radio/X-ray Associations (MORX) Catalogue \|Flesch Eric W. \| PASA \| 33-52 \| 2016 \| 2016PASA...33...52F \| http://ui.adsabs.harvard.edu/#abs/2016PASA...33...52F The EXOD search for faint transients in XMM-Newton observations: Method and discovery of four extragalactic Type I X-ray bursters \|Pastor-Marazuela I. Webb N. A. et al. \| A&A \| 640-124 \| 2020 \| 2020A&A...640A.124P \| http://ui.adsabs.harvard.edu/#abs/2020A&A...640A.124P 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 The XMM-Newton Line Emission Analysis Program (X-LEAP). I. Emission-line Survey of O VII O VIII and Fe L-shell Transitions \|Pan Zeyang Qu Zhijie et al. \| ApJS \| 271-62 \| 2024 \| 2024ApJS..271...62P \| http://ui.adsabs.harvard.edu/#abs/2024ApJS..271...62P 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 New 511 keV Line Data Provide Strongest sub-GeV Dark Matter Constraints \|De la Torre Luque Pedro Balaji Shyam \| ApJ \| 973-L6 \| 2024 \| 2024ApJ...973L...6D \| http://ui.adsabs.harvard.edu/#abs/2024ApJ...973L...6D
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2011-09-01T14:14:08Z/2011-09-01T18:56:02Z
Version	21.51_20241115_1113
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	2012-09-29T00:00:00Z
Last Update	2026-07-09
Keywords	"accretion flow", "short period 95", "white dwarf", "M8", "deep eclipsing polar", "deepest optical eclipses", "short period", "band eclipse", "period bouncer ", "", "time resolution spectrophotometry", "low mass secondary", "accretion disk"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Prof Paolo Coppi, 2012, 'A First Look at a Short Period, Extremely Deep-Eclipsing Polar', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-0fybdc6
Rights	Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.