%0 Journal Article %1 chae2024robust %A Chae, Kyu-Hyun %B The Astrophysical Journal %D 2024 %I The American Astronomical Society %K astronomy binary_systems mond %N 2 %P 114-- %R 10.3847/1538-4357/ad0ed5 %T Robust Evidence for the Breakdown of Standard Gravity at Low Acceleration from Statistically Pure Binaries Free of Hidden Companions %U https://dx.doi.org/10.3847/1538-4357/ad0ed5 %V 960 %X It is found that Gaia Data Release 3 binary stars selected with stringent requirements on astrometric measurements and radial velocities naturally satisfy Newtonian dynamics without hidden close companions when the projected separation s ≲ 2 kau, showing that pure binaries can be selected. It is then found that pure binaries selected with the same criteria show a systematic deviation from the Newtonian expectation when s ≳ 2 kau. When both proper motions and parallaxes are required to have precision better than 0.005 and radial velocities better than 0.2, I obtain 2463 statistically pure binaries within a “clean” G-band absolute magnitude range. From this sample, I obtain an observed-to-Newtonian predicted kinematic acceleration ratio of for acceleration ≲10−10 m s−2, in excellent agreement with 1.49 ± 0.07 for a much larger general sample with the amount of hidden close companions self-calibrated. I also investigate the radial profile of stacked sky-projected relative velocities without a deprojection to the 3D space. The observed profile matches the Newtonian predicted profile for s ≲ 2 kau without any free parameters, but shows a clear deviation at a larger separation with a significance of ≈5.0σ. The projected velocity boost factor for s ≳ 5 kau is measured to be (stat) ±0.05 (sys) matching . Finally, for a small sample of 40 binaries with exceptionally precise radial velocities (fractional errors <0.005), the directly measured relative velocities in the 3D space also show a boost at larger separations. These results robustly confirm the recently reported gravitational anomaly at low acceleration for a general sample.

@article{chae2024robust, abstract = {It is found that Gaia Data Release 3 binary stars selected with stringent requirements on astrometric measurements and radial velocities naturally satisfy Newtonian dynamics without hidden close companions when the projected separation s ≲ 2 kau, showing that pure binaries can be selected. It is then found that pure binaries selected with the same criteria show a systematic deviation from the Newtonian expectation when s ≳ 2 kau. When both proper motions and parallaxes are required to have precision better than 0.005 and radial velocities better than 0.2, I obtain 2463 statistically pure binaries within a “clean” G-band absolute magnitude range. From this sample, I obtain an observed-to-Newtonian predicted kinematic acceleration ratio of for acceleration ≲10−10 m s−2, in excellent agreement with 1.49 ± 0.07 for a much larger general sample with the amount of hidden close companions self-calibrated. I also investigate the radial profile of stacked sky-projected relative velocities without a deprojection to the 3D space. The observed profile matches the Newtonian predicted profile for s ≲ 2 kau without any free parameters, but shows a clear deviation at a larger separation with a significance of ≈5.0σ. The projected velocity boost factor for s ≳ 5 kau is measured to be (stat) ±0.05 (sys) matching . Finally, for a small sample of 40 binaries with exceptionally precise radial velocities (fractional errors <0.005), the directly measured relative velocities in the 3D space also show a boost at larger separations. These results robustly confirm the recently reported gravitational anomaly at low acceleration for a general sample.}, added-at = {2024-01-14T12:40:50.000+0100}, author = {Chae, Kyu-Hyun}, biburl = {https://www.bibsonomy.org/bibtex/2f905b6d18bc4760621cd6f685421d4c5/tabularii}, booktitle = {The Astrophysical Journal}, doi = {10.3847/1538-4357/ad0ed5}, interhash = {41adda4368ab7f6119de28cffdad3330}, intrahash = {f905b6d18bc4760621cd6f685421d4c5}, issn = {0004637X}, keywords = {astronomy binary_systems mond}, number = 2, pages = {114--}, publisher = {The American Astronomical Society}, timestamp = {2024-01-14T12:40:50.000+0100}, title = {Robust Evidence for the Breakdown of Standard Gravity at Low Acceleration from Statistically Pure Binaries Free of Hidden Companions}, url = {https://dx.doi.org/10.3847/1538-4357/ad0ed5}, volume = 960, year = 2024 }