edu.ucar.opensky::articles:43764 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T17:47:53.129845 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.net/ark:/85065/d7f47tkr https://doi.org/10.17909/T9-ST5G-3177 https Related Dataset #1 TESS "Fast" Light Curves - All Sectors https://doi.org/10.5281/zenodo.10205573 https Related Software #1 pymc-devs/pymc: v5.10.0 https://doi.org/10.5281/zenodo.3715232 https Related Software #2 pandas-dev/pandas: Pandas 1.0.3 https://doi.org/10.5281/zenodo.7191939 https Related Software #3 exoplanet: Gradient-based probabilistic inference for exoplanet data &amp; other astronomical time series https://doi.org/10.5281/zenodo.8049794 https Related Software #4 pymc-devs/pytensor: rel-2.12.3 Three-dimensional orbit and dynamical masses of GJ 105 AC 2025-06-01T00:00:00Z publication https://n2t.net/ark:/85065/d7f47tkr https://doi.org/10.3847/1538-4357/adc564 C. M. Dedrick author Wright, J. T. author J. D. Eastman author C. H. Blake author Johnson, S. A. author Plavchan, P. author Johnson, J. A. author D. H. Sliski author Wilson, Maurice author Wittenmyer, R. A. author Barclay, T. author Horner, J. author Kane, S. R. author Wang, S. X. author UCAR/NCAR - Library publisher The precision of stellar models is higher than the precision at which we are able to measure the masses of most stars, with the notable exception of binaries where we can determine dynamical masses of the component stars. In addition to well-measured stellar properties, the ideal benchmark star is far enough from its companion that its properties are indistinguishable from an otherwise identical single star. Currently, there are a handful of stars with precise (&#177;3%), model-independent mass measurements that are &#8220;effectively single&#8221; and for which we can obtain clean spectra (i.e., spectra that are not blended with a close companion). In this paper, we introduce GJ 105 AC as the newest members of this exclusive population. We present an updated orbital analysis for the long-period K3+M7 binary GJ 105 AC. We jointly analyze radial velocity (RV) and relative astrometry data, including new RVs from the Miniature Exoplanet Radial Velocity Array that capture the full periapsis passage and the RV minimum of the 76.0 &#177; 1.3 yr orbit for the first time. We derive precise dynamical masses of M 1 = 0.78 &#177; 0.02 M &#8857; and M 2 = 0.098 &#177; 0.002 M &#8857; . We find that of all stars with similarly precise masses (&#8764;2%), GJ 105 AC stands out as having the widest on-sky separation after &#945; Centauri AB, making it one of the most easily accessible to spectroscopy, as well as the the second-widest true separation, ensuring that its members are truly &#8220;effectively single&#8221; in terms of their evolution. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication <span style="font-family:Arial;font-size:10pt;font-style:normal;" data-sheets-root="1">Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.</span> None eng geoscientificInformation