ZTF J1901+5309: a 40.6-min orbital period eclipsing double white dwarf system

Creators: Coughlin, Michael W.; Burdge, Kevin; Phinney, E. Sterl; van Roestel, Jan; Bellm, Eric C.; Dekany, Richard G.; Delacroix, Alexandre; Duev, Dmitry A.; Feeney, Michael; Graham, Matthew J.; Kulkarni, S. R.; Kupfer, Thomas; Laher, Russ R.; Masci, Frank J.; Prince, Thomas A.; Riddle, Reed; Rosnet, Philippe; Smith, Roger; Serabyn, Eugene; Walters, Richard

Abstract

The Zwicky Transient Facility has begun to discover binary systems with orbital periods that are less than 1 h. Combined with dedicated follow-up systems, which allow for high-cadence photometry of these sources, systematic confirmation and characterization of these sources are now possible. Here, we report the discovery of ZTF J190125.42+530929.5, a 40.6-min orbital period, eclipsing double white dwarf binary. Both photometric modelling and spectroscopic modelling confirm its nature, yielding an estimated inclination of i=86.2^(+0.6)_(−0.2) deg and primary and secondary effective temperatures of {T}_(eff)=28000⁺⁵⁰⁰₋₅₀₀ and 17600⁺⁴⁰⁰₋₄₀₀, respectively. This system adds to a growing list of sources for future gravitational-wave detectors and contributes to the demographic analysis of double degenerates.

Additional Information

© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). Accepted 2020 March 6. Received 2020 March 5; in original form 2020 February 17. Published: 30 March 2020. MC is supported by the David and Ellen Lee Prize Postdoctoral Fellowship at the California Institute of Technology. SRK thanks the Heising-Simons Foundation for supporting his research with ZTF. Part of this work was carried out at the Jet Propulsion Laboratory, under contract with NASA. ESP's research was funded in part by the Gordon and Betty Moore Foundation through Grant GBMF5076. Based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope at the Palomar Observatory as part of the ZTF project. ZTF is supported by the National Science Foundation under Grant No. AST-1440341 and a collaboration including Caltech, IPAC, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, the University of Washington (UW), Deutsches Elektronen-Synchrotron and Humboldt University, Los Alamos National Laboratories, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, and Lawrence Berkeley National Laboratories. Operations are conducted by Caltech Optical Observatories, IPAC, and UW. The KPED team thanks the National Science Foundation and the National Optical Astronomical Observatory for making the Kitt Peak 2.1-m telescope available. We thank the observatory staff at Kitt Peak for their efforts to assist Robo-AO KP operations. The KPED team thanks the National Science Foundation, the National Optical Astronomical Observatory, the Caltech Space Innovation Council, and the Murty family for support in the building and operation of KPED. In addition, they thank the CHIMERA project for use of the Electron Multiplying CCD (EMCCD).

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