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

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

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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+0062 deg and primary and secondary effective temperatures of Teff = 28 000+500500 and 17 600+400400 K, respectively. This system adds to a growing list of sources for future gravitational-wave detectors and contributes to the demographic analysis of double degenerates.

Original languageEnglish (US)
Pages (from-to)L91-L96
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume494
Issue number1
DOIs
StatePublished - 2020

Bibliographical note

Funding Information:
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).

Funding Information:
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.

Funding Information:
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).

Funding Information:
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.

Publisher Copyright:
© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Keywords

  • (stars:) binaries: eclipsing
  • (stars:) white dwarfs

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