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.
%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
}