文章基本信息

标题：Discovery of Three Self-lensing Binaries from Kepler
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作者：Hajime Kawahara ; Kento Masuda ; Morgan MacLeod 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2018
卷号：155
期号：3
页码：1-16
DOI：10.3847/1538-3881/aaaaaf
语种：English
出版社：American Institute of Physics
摘要：We report the discovery of three edge-on binaries with white dwarf (WD) 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 WD 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 WD) has been proposed as the formation mechanism. Because the actual masses for our three WD companions have been accurately determined, these self-lensing systems would provide excellent tests for models of interacting binaries.
关键词：blue stragglers;techniques: photometric;techniques: radial velocities;white dwarfs