A dataset provided by the European Space Agency

Name: The ultra-compact sdOB+WD binary ZTF J213056.71+442046.5
Published: 2022-01-31T00:00:00Z

Proposal ID	086215
Title	The ultra-compact sdOB+WD binary ZTF J213056.71+442046.5
Download Data Associated to the proposal	https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0862150101
DOI	https://doi.org/10.57780/esa-sziypb8
Principal Investigator, PI	Dr SANDRO MEREGHETTI
Abstract	Very recently, it has been discovered that ZTF J213056.71+442046.5 is a binarysystem composed of a white dwarf orbiting a hot subdwarf star in only 39 min.This is the shortest orbital period of any sdOB+WD binary. The orbitalseparation implies that the subdwarf fills its Roche-lobe, making this system anoptimal candidate for observations at X-ray energies. The likely presence ofX-ray emission is further strengthened by the finding that the periodicmodulation of the optical light curve can be explained only invoking thepresence of an accretion disk around the white dwarf, which occults the subdwarfmass donor star. X-ray observations can give important information on the masstransfer rate, on the properties of the WD and on the evolution of this unique binary.
Publications	X-Ray Observation of the Roche-lobe-filling White Dwarf plus Hot Subdwarf System ZTF J213056.71+442046.5 \|Mereghetti, S., La Palombara, N., et al. \| ApJ \| 931-13 \| 2022 \| 2022ApJ...931...13M \| http://ui.adsabs.harvard.edu/#abs/2022ApJ...931...13M Limiting the accretion disc light in two mass transferring hot subdwarf binaries \|Deshmukh, Kunal, Kupfer, Thomas, et al. \| MNRAS \| 519-148 \| 2023 \| 2023MNRAS.519..148D \| http://ui.adsabs.harvard.edu/#abs/2023MNRAS.519..148D 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
Instrument	EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage	2021-01-05T23:01:46Z/2021-01-06T18:53:26Z
Version	18.02_20200221_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	2022-01-31T00:00:00Z
Keywords	"orbital separation implies", "optical light curve", "mass transfer rate", "xray energies", "shortest orbital period", "subdwarf fills", "ztf j213056", "white dwarf", "accretion disk", "optimal candidate", "binary system composed", "periodic modulation", "xray emission", "wd binary", "hot subdwarf star", "ultra compact sdob", "white dwarf orbiting", "roche lobe"
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Dr SANDRO MEREGHETTI, 2022, 'The ultra-compact sdOB+WD binary ZTF J213056.71+442046.5', 18.02_20200221_1200, European Space Agency, https://doi.org/10.57780/esa-sziypb8