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X-ray observation of the Roche-lobe-filling white dwarf plus hot subdwarf system ZTF J213056.71+442046.5
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Mereghetti, S., La Palombara, N., Kupfer, T., Marsh, T. R., Copperwheat, C. M., Deshmukh, K., Esposito, P., Maccarone, T., Pintore, F., Rigoselli, M., Rivera Sandoval, L. and Tiengo, A. (2022) X-ray observation of the Roche-lobe-filling white dwarf plus hot subdwarf system ZTF J213056.71+442046.5. The Astrophysical Journal, 931 (1). 13. doi:10.3847/1538-4357/ac686e ISSN 0004-637X.
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WRAP-X-ray-observation-of-the-Roche-lobe-filling-white-dwarf-plus-hot-subdwarf-system-ZTF-J213056.71-442046.5-Marsh-22.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (762Kb) | Preview |
Official URL: http://dx.doi.org/10.3847/1538-4357/ac686e
Abstract
ZTF J213056.71+442046.5 is the prototype of a small class of recently discovered compact binaries composed of a white dwarf and a hot subdwarf that fills its Roche lobe. Its orbital period of only 39 minutes is the shortest known for the objects in this class. Evidence for a high orbital inclination (i = 86°) and for the presence of an accretion disk has been inferred from a detailed modeling of its optical photometric and spectroscopic data. We report the results of an XMM-Newton observation carried out on 2021 January 7. ZTF J213056.71+442046.5 was clearly detected by the Optical Monitor, which showed a periodic variability in the UV band (200–400 nm), with a light curve similar to that seen at longer wavelengths. Despite accretion on the white dwarf at an estimated rate of the order of 10−9 M⊙ yr−1, no X-rays were detected with the EPIC instrument, with a limit of ∼1030 erg s−1 on the 0.2–12 keV luminosity. We discuss possible explanations for the lack of a strong X-ray emission from this system.
| Item Type: | Journal Article | |||||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | White dwarf stars, Supernovae, Dwarf stars, Accretion (Astrophysics), Compact objects (Astronomy) | |||||||||||||||||||||
| Journal or Publication Title: | The Astrophysical Journal | |||||||||||||||||||||
| Publisher: | Institute of Physics Publishing, Inc. | |||||||||||||||||||||
| ISSN: | 0004-637X | |||||||||||||||||||||
| Official Date: | 19 May 2022 | |||||||||||||||||||||
| Dates: |
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| Volume: | 931 | |||||||||||||||||||||
| Number: | 1 | |||||||||||||||||||||
| Number of Pages: | 8 | |||||||||||||||||||||
| Article Number: | 13 | |||||||||||||||||||||
| DOI: | 10.3847/1538-4357/ac686e | |||||||||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||||||||
| Publication Status: | Published | |||||||||||||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||||||||
| Date of first compliant deposit: | 5 July 2022 | |||||||||||||||||||||
| Date of first compliant Open Access: | 6 July 2022 | |||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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