%0 Generic %1 stassun2016evidence %A Stassun, Keivan G. %A Torres, Guillermo %D 2016 %K astrometry %T Evidence for a systematic offset of $-$0.25~mas in the Gaia DR1 parallaxes %U http://arxiv.org/abs/1609.05390 %X We test the parallaxes reported in the Gaia first data release using the sample of eclipsing binaries with accurate, empirical distances from Stassun & Torres (2016). We find a clear average offset of $-$0.25$\pm$0.05 mas in the sense of the Gaia parallaxes being too small (i.e., the distances too long). The documented Gaia systematic uncertainty is 0.3 mas, which the eclipsing binary sample corroborates. The offset does not depend strongly on obvious parameters such as color, brightness, or spatial position. However, with a statistical significance of 99.7%, nearer stars possibly exhibit larger offsets according to $\Delta-0.16 -0.02 \pi$ mas.

@misc{stassun2016evidence, abstract = {We test the parallaxes reported in the Gaia first data release using the sample of eclipsing binaries with accurate, empirical distances from Stassun & Torres (2016). We find a clear average offset of $-$0.25$\pm$0.05 mas in the sense of the Gaia parallaxes being too small (i.e., the distances too long). The documented Gaia systematic uncertainty is 0.3 mas, which the eclipsing binary sample corroborates. The offset does not depend strongly on obvious parameters such as color, brightness, or spatial position. However, with a statistical significance of 99.7%, nearer stars possibly exhibit larger offsets according to $\Delta\pi \approx -0.16 -0.02 \times \pi$ mas.}, added-at = {2016-09-20T17:40:40.000+0200}, author = {Stassun, Keivan G. and Torres, Guillermo}, biburl = {https://www.bibsonomy.org/bibtex/26eb32cb4db8bc9a5f959e54ee86c6161/superjenwinters}, description = {Evidence for a systematic offset of $-$0.25~mas in the Gaia DR1 parallaxes}, interhash = {172171bb1da9a796da37c3bba58c0d3b}, intrahash = {6eb32cb4db8bc9a5f959e54ee86c6161}, keywords = {astrometry}, note = {cite arxiv:1609.05390Comment: 9 pages, 3 figures, 1 table. Submitted to ApJ Letters}, timestamp = {2016-09-20T17:40:40.000+0200}, title = {Evidence for a systematic offset of $-$0.25~mas in the Gaia DR1 parallaxes}, url = {http://arxiv.org/abs/1609.05390}, year = 2016 }