Discovery of three self-lensing binaries from Kepler

Abstract

We report the discovery of three edge-on binaries with white dwarf companions that gravitationally magnify (instead of eclipsing) the light of their stellar primaries, as revealed by a systematic search for pulses with long periods in the Kepler photometry. We jointly model the self-lensing light curves and radial-velocity orbits to derive the white dwarf masses, all of which are close to 0.6 Solar masses. The orbital periods are long, ranging from 419 to 728 days, and the eccentricities are low, all less than 0.2. These characteristics are reminiscent of the orbits found for many blue stragglers in open clusters and the field, for which stable mass transfer due to Roche-lobe overflow from an evolving primary (now a white dwarf) has been proposed as the formation mechanism. Because the actual masses for our three white dwarf companions have been accurately determined, these self-lensing systems would provide excellent tests for models of interacting binaries.

21 pages, 13 figures; accepted for publication in the Astronomical Journal

References in corpus (19)

• Mind your Ps and Qs: the Interrelation between Period (P) and Mass-ratio (Q) Distributions of Binary Stars
• VOSA: Virtual Observatory SED Analyzer. An application to the Collinder 69 open cluster
• Tidal dissipation in stars and giant planets
• Found: The missing blue opacity in atmosphere models of cool hydrogen white dwarfs
• PyTransit: Fast and Easy Exoplanet Transit Modelling in Python
• Post Common Envelope Binaries from SDSS. I: 101 white dwarf main sequence binaries with multiple SDSS spectroscopy
• Mass Transfer from Giant Donors
• The population of long-period transiting exoplanets
• KOI-3278: A Self-Lensing Binary Star System
• The SDSS spectroscopic catalogue of white dwarf-main sequence binaries: new identifications from DR9-12
• Spin-Orbit Angles of Kepler-13Ab and HAT-P-7b from Gravity-Darkened Transit Light Curves
• Probing the deep end of the Milky Way with \emph{Kepler}: Asteroseismic analysis of 854 faint Red Giants misclassified as Cool Dwarfs
• Transiting Planet Candidates Beyond the Snow Line Detected by Visual Inspection of 7557 Kepler Objects of Interest
• Discovery of Two New Thermally Bloated Low-Mass White Dwarfs Among the Kepler Binaries
• Characterizing the Cool KOIs. V. KOI-256: A Mutually Eclipsing Post-Common Envelope Binary
• White dwarf-main sequence binaries from LAMOST: the DR1 catalogue
• The evolution of the self-lensing binary KOI-3278: evidence of extra energy sources during CE evolution
• Global Analysis of KOI-977: Spectroscopy, Asteroseismology, and Phase-curve Analysis
• Degeneracy between Lensing and Occultation in the Analysis of Self-lensing Phenomena

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• Observations of Spin-Down in Post-Mast-Transfer Stars and the Possibility for Blue Straggler Gyrochronology
• Transiting Planets near the Snow Line from Kepler. I. Catalog
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• The White Dwarf Binary Pathways Survey VII: Evidence for a bi-modal distribution of post mass transfer systems?
• Predicting the self-lensing population in optical surveys
• No longer impossible: the self-lensing binary KIC 8145411 is a triple
• Population demographics of white dwarf binaries with intermediate separations: Gaia constraints on post-AGB mass transfer
• The Blue Lurker WOCS 14020: A Long-Period Post-Common-Envelope Binary in M67 Originating from a Merger in a Triple System
• The Mass of the White Dwarf Companion in the Self-Lensing Binary KOI-3278: Einstein vs. Newton
• Rethinking mass transfer: a unified semi-analytical framework for circular and eccentric binaries. I. Orbital evolution due to conservative mass transfer
• Rethinking mass transfer: a unified semianalytical framework for circular and eccentric binaries. II. Orbital evolution due to nonconservative mass transfer
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• Direct detections of white dwarfs in four WD+dM post-common envelope binaries within 20 pc
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• Self-lensing binaries as probes of Supernova physics