An eclipsing 47 minute double white dwarf binary at 400 pc

Abstract

We present the discovery of the eclipsing double white dwarf (WD) binary WDJ 022558.21−692025.38 that has an orbital period of 47.19 min. Following identification with the Transiting Exoplanet Survey Satellite, we obtained time-series ground based spectroscopy and high-speed multi-band ULTRACAM photometry which indicate a primary DA WD of mass 0.40 ± 0.04 M⊙ and a 0.28 ± 0.02 M⊙ mass secondary WD, which is likely of type DA as well. The system becomes the third-closest eclipsing double WD binary discovered with a distance of approximately 400 pc and will be a detectable source for upcoming gravitational wave detectors in the mHz frequency range. Its orbital decay will be measurable photometrically within 10 yrs to a precision of better than 1%. The fate of the binary is to merge in approximately 41 Myr, likely forming a single, more massive WD.

Metadata

Item Type:	Article
Authors/Creators:	Munday, J. https://orcid.org/0000-0002-1872-5398 Tremblay, P.-E. Hermes, J.J. https://orcid.org/0000-0001-5941-2286 Barlow, B. Pelisoli, I. https://orcid.org/0000-0003-4615-6556 Marsh, T.R. https://orcid.org/0000-0002-2498-7589 Parsons, S.G. https://orcid.org/0000-0002-2695-2654 Jones, D. https://orcid.org/0000-0003-3947-5946 Kepler, S.O. https://orcid.org/0000-0002-7470-5703 Brown, A. https://orcid.org/0000-0002-3316-7240 Littlefair, S.P. Hegedus, R. Baran, A. https://orcid.org/0000-0001-6446-6617 Breedt, E. https://orcid.org/0000-0001-6180-3438 Dhillon, V.S. https://orcid.org/0000-0003-4236-9642 Dyer, M.J. https://orcid.org/0000-0003-3665-5482 Green, M.J. https://orcid.org/0000-0002-0948-4801 Kennedy, M.R. https://orcid.org/0000-0001-6894-6044 Kerry, P. Lopez, I.D. Romero, A.D. Sahman, D. Worters, H.L.
Copyright, Publisher and Additional Information:	© 2023 The Authors. Except as otherwise noted, this author-accepted version of a journal article published in Monthly Notices of the Royal Astronomical Society is made available under the terms of the Creative Commons Attribution 4.0 International License (CC-BY 4.0), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/
Keywords:	binaries: close; individual: WDJ 022558.21−692025.38; stars: white dwarfs; gravitational waves
Dates:	Submitted: 25 March 2023 Accepted: 31 July 2023 Published (online): 4 August 2023 Published: October 2023
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Funding Information:	Funder Grant number Engineering and Physical Sciences Research Council 2263443 SCIENCE AND TECHNOLOGY FACILITIES COUNCIL ST/R003424/1
Depositing User:	Symplectic Sheffield
Date Deposited:	15 Aug 2023 10:39
Last Modified:	04 Oct 2024 14:34
Status:	Published
Publisher:	Oxford University Press (OUP)
Refereed:	Yes
Identification Number:	10.1093/mnras/stad2347
Related URLs:	arXiv URL
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:202433

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An eclipsing 47 minute double white dwarf binary at 400 pc

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