Probabilities for Solar Siblings

• Published in: Celestial mechanics and dynamical astronomy Vol. 121; no. 2; pp. 107 - 119
• Main Authors: Valtonen, Mauri, Bajkova, A. T., Bobylev, V. V., Mylläri, A.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.02.2015; Springer Nature B.V
• Subjects: Aerospace Technology and Astronautics; Astrobiology; Astronomical models; Astronomy; Astrophysics and Astroparticles; Birth; Classical Mechanics; Clusters; Dynamical Systems and Ergodic Theory; Evolution; Geophysics/Geodesy; Orbits; Original Article; Physics; Physics and Astronomy; Siblings; Solar neighborhood; Solar physics; Stars & galaxies; Sun; Stellar clusters and associations; Stellar motion; Spiral galaxies; Astrobiology; Solar neighborhood
• ISSN: 0923-2958; 1572-9478
• DOI: 10.1007/s10569-014-9592-1

We have shown previously (Bobylev et al. Astron Lett 37:550–562, 2011 ) that some of the stars in the solar neighborhood today may have originated in the same star cluster as the Sun, and could thus be called Solar Siblings. In this work we investigate the sensitivity of this result to galactic models and to parameters of these models, and also extend the sample of orbits. There are a number of good candidates for the sibling category, but due to the long period of orbit evolution since the break-up of the birth cluster of the Sun, one can only attach probabilities of membership. We find that up to 10 % (but more likely around 1 %) of the members of the Sun’s birth cluster could be still found within 100 pc from the Sun today.