A dataset provided by the European Space Agency

Name: The Ultra Compact sdB+WD binary CD -30 11223
Published: 2014-09-07T00:00:00Z

Proposal ID	072143
Title	The Ultra Compact sdB+WD binary CD -30 11223
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0721430101
DOI	https://doi.org/10.5270/esa-wwx2a0y
Principal Investigator, PI	Prof Ulrich Heber
Abstract	We have recently discovered that CD -30 11223 is a binary composed of a whitedwarf orbiting a subdwarf of B spectral type in only 1.2 hours. This is by farthe shortest orbital period of any sdB+WD binary. The orbital separation of only0.6 solar radii implies that the subdwarf is very close to fill its Roche-lobe,making this system an optimal candidate for observations at X-ray energies.X-ray observations can give information on properties of the white dwarfunaccessible in other bands, which are particularly interesting given thepossibility that this close binary be the progenitor of a SN Ia via theso-called sub-Chandrasekhar double-detonation scenario.
Publications	Constraints on the winds of hot subdwarf stars from X-ray observations of two sdB binaries with compact companions: CD -30 11223 and PG 1232-136 \|Mereghetti, S., La Palombara, N., et al. \| MNRAS \| 441-2684 \| 2014 \| 2014MNRAS.441.2684M \| http://ui.adsabs.harvard.edu/#abs/2014MNRAS.441.2684M 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 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
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2013-08-17T04:02:16Z/2013-08-17T18:45:36Z
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	2014-09-07T00:00:00Z
Keywords	"xray energies", "binary composed", "white dwarf unaccessible", "ultra compact sdb", "shortest orbital period", "asupernovaia via", "orbital separation", "spectral type", "close binary", "wd binary cd", "optimal candidate", "wd binary", "solar radii implies", "white dwarf orbiting", "roche lobe"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Prof Ulrich Heber, 2014, 'The Ultra Compact sdB+WD binary CD -30 11223', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-wwx2a0y