%0 Generic %1 fezenko2022enhancement %A Fezenko, Gavin B. %A Hwang, Hsiang-Chih %A Zakamska, Nadia L. %D 2022 %K multiplicity %T Enhancement of Double-Close-Binary Quadruples %U http://arxiv.org/abs/2202.00021 %X Double-close-binary quadruples (2+2 systems) are hierarchical systems of four stars where two short-period binary systems move around their common center of mass on a wider orbit. Using Gaia Early Data Release 3, we search for comoving pairs where both components are eclipsing binaries. We present eight 2+2 quadruple systems with inner orbital periods of $<$ 0.4 days and with outer separations of $1000$ AU. All but one system are newly discovered by this work, and we catalog their orbital information measured from their light curves. We find that the occurrence rate of 2+2 quadruples is 7.3 $\pm$ 2.6 times higher than what is expected from random pairings of field stars. At most a factor of $\sim$2 enhancement may be explained by the age and metallicity dependence of the eclipsing binary fraction in the field stellar population. The remaining factor of $\sim$3 represents a genuine enhancement of the production of short-period binaries in wide-separation ($>10^3$ AU) pairs, suggesting a close binary formation channel that may be enhanced by the presence of wide companions.

@misc{fezenko2022enhancement, abstract = {Double-close-binary quadruples (2+2 systems) are hierarchical systems of four stars where two short-period binary systems move around their common center of mass on a wider orbit. Using Gaia Early Data Release 3, we search for comoving pairs where both components are eclipsing binaries. We present eight 2+2 quadruple systems with inner orbital periods of $<$ 0.4 days and with outer separations of $\gtrsim 1000$ AU. All but one system are newly discovered by this work, and we catalog their orbital information measured from their light curves. We find that the occurrence rate of 2+2 quadruples is 7.3 $\pm$ 2.6 times higher than what is expected from random pairings of field stars. At most a factor of $\sim$2 enhancement may be explained by the age and metallicity dependence of the eclipsing binary fraction in the field stellar population. The remaining factor of $\sim$3 represents a genuine enhancement of the production of short-period binaries in wide-separation ($>10^3$ AU) pairs, suggesting a close binary formation channel that may be enhanced by the presence of wide companions.}, added-at = {2022-02-03T04:16:45.000+0100}, author = {Fezenko, Gavin B. and Hwang, Hsiang-Chih and Zakamska, Nadia L.}, biburl = {https://www.bibsonomy.org/bibtex/2a81a973595a4f87c1bc2c0cd6dd3c34a/superjenwinters}, description = {Enhancement of Double-Close-Binary Quadruples}, interhash = {1b446142d2ec0966468ae95a75e9bb8b}, intrahash = {a81a973595a4f87c1bc2c0cd6dd3c34a}, keywords = {multiplicity}, note = {cite arxiv:2202.00021Comment: 19 pages, 6 figures, accepted for publication by MNRAS}, timestamp = {2022-02-03T04:16:45.000+0100}, title = {Enhancement of Double-Close-Binary Quadruples}, url = {http://arxiv.org/abs/2202.00021}, year = 2022 }