Multi-band light curve analysis of the 40.5-minute period eclipsing double-degenerate binary SDSS J082239.54$+$304857.19

Abstract

We present the Apache Point Observatory BG40 broadband and simultaneous Gemini $r$-band and $i$-band high-speed follow-up photometry observations and analysis of the 40.5 minute period eclipsing detached double-degenerate binary SDSS J082239.54$+$304857.19. Our APO data spans over 318 days and includes 13 primary eclipses, from which we precisely measure the system's orbital period and improve the time of mid-eclipse measurement. We fit the light curves for each filter individually and show that this system contains a low-mass DA white dwarf with radius $R_A=0.031\pm 0.006{\mathrm{R}}_{\odot }$ and a $R_B=0.013\pm 0.005{\mathrm{R}}_{\odot }$ companion at an inclination of $i=87.7\pm 0.2^{\circ }$. We use the best-fitting eclipsing light curve model to estimate the temperature of the secondary star as $T_{\mathrm{eff}}=5200\pm 100\mathrm{K}$. Finally, while we do not record significant offsets to the expected time of mid-eclipse caused by the emission of gravitational waves with our 1-year baseline, we show that a $3\sigma$ significant measurement of the orbital decay due to gravitational waves will be possible in 2023, at which point the eclipse will occur about $8$ seconds earlier than expected.

arXiv comment8 pages, 8 figures, 2 tables. Accepted for publication in MNRAS

References in corpus (29)

• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Achieving better than 1 minute accuracy in the Heliocentric and Barycentric Julian Dates
• An Improved Spectroscopic Analysis of DA White Dwarfs from the Sloan Digital Sky Survey Data Release 4
• Eclipsing binaries in open clusters. II. V453 Cyg in NGC 6871
• Models of low-mass helium white dwarfs including gravitational settling, thermal and chemical diffusion, and rotational mixing
• A 12 minute Orbital Period Detached White Dwarf Eclipsing Binary
• General relativistic orbital decay in a seven-minute-orbital-period eclipsing binary system
• Absolute dimensions of detached eclipsing binaries. I. The metallic-lined system WW Aurigae
• The solar-type eclipsing binary system LL Aquarii
• A systematic search of Zwicky Transient Facility data for ultracompact binary LISA-detectable gravitational-wave sources
• Testing the white dwarf mass-radius relationship with eclipsing binaries
• Rapid Orbital Decay in the 12.75-minute WD+WD Binary J0651+2844
• The ELM Survey. VIII. 98 Double White Dwarf Binaries
• Discovery of the Eclipsing Detached Double White Dwarf Binary NLTT 11748
• Found: The Progenitors of AM CVn and Supernovae .Ia
• Limb-Darkening Coefficients for Eclipsing White Dwarfs
• A deeply eclipsing detached double helium white dwarf binary
• Orbital Decay in a 20 Minute Orbital Period Detached Binary with a Hydrogen Poor Low Mass White Dwarf
• Dynamical Tides in Compact White Dwarf Binaries: Helium Core White Dwarfs, Tidal Heating, and Observational Signatures
• Discovery of a Bright, Extremely Low-Mass White Dwarf in a Close Double Degenerate System
• Gravity and limb-darkening coefficients for compact stars: DA, DB, and DBA eclipsing white dwarfs
• Tidal Interactions in Merging White Dwarf Binaries
• SDSS J1152+0248: An eclipsing double white dwarf from the Kepler K2 campaign
• The ELM Survey South. I. An Effective Search for Extremely Low Mass White Dwarfs
• ZTF J1901+5309: A 40.6-Minute Orbital Period Eclipsing Double White Dwarf System
• Discovery of a Detached, Eclipsing 40 min Period Double White Dwarf Binary and a Friend: Implications for He+CO White Dwarf Mergers
• Tidal Perturbations to the Gravitational Inspiral of J0651+2844
• Discovery of eclipsing white dwarf systems in a search for Earth-size companions

Cited by in corpus (4)

• White dwarf binaries suggest a common envelope efficiency $\alpha \sim 1/3$
• A Catalogue of Potential Post Common Envelope Binaries
• Identifying LISA verification binaries among the Galactic population of double white dwarfs
• Influence of a mass transfer stability criterion on double white dwarf populations