American Journal of Astronomy and Astrophysics
Volume 4, Issue 6, November 2016, Pages: 83-88
Received: Oct. 27, 2016;
Accepted: Nov. 9, 2016;
Published: Dec. 12, 2016
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Martin Beech, Campion College, University of Regina, Regina, Canada; Department of Physics, University of Regina, Regina, Canada
Lowell Peltier, Department of Physics, University of Regina, Regina, Canada
The encounter between Gliese 710 and the solar system is re-examined in light of the newly published parallax and proper motion measurements within the GAIA data 1 release. The up-dated astrometric parameters are found to be significantly different from those implicated by the earlier Hipparcos Catalog and the revised encounter will see GL 710 pass some 5 times closer to the Sun than previously indicated. The closest encounter distance is now found to be 0.064 0.020 pc at a time 1.36 0.12 million years from the present. There is now a 100% certainty that GL 710 will pass through the outer boundary of the Oort cloud, and it will possibly pass as close as 5200 AU to the Sun, indicating the potential for non-negligible gravitational perturbations of those cometary nuclei located close to the inner boundary of the Oort cloud. The revised encounter conditions indicate that a relatively strong cometary shower is likely within the inner solar system, although how this will modify the terrestrial impact probability remains unclear. We find that GL 710 might be expected to capture and accrete several thousands of cometary nuclei as it moves through the Oort cloud, and such impacts can be expected to drive anomalous flare activity. We additionally find that GL 710 will quite likely trigger sublimation-driven outgassing from cometary nuclei situated within a few astronomical units of its path across the Oort cloud.
A GAIA Revised Oort Cloud Encounter with Gliese 710, American Journal of Astronomy and Astrophysics.
Vol. 4, No. 6,
2016, pp. 83-88.
The Gaia collaboration, 2016. The Gaia mission. Astron. Astrophys. Manuscript aa29272-16.
Garcia-Sanchez, J., et al. 1999. Stellar encounters with the Oort cloud based on Hipparcos data. Astron. J. 117, 1042-1055.
Garcia-Sanchez, J., et al. 2001. Stellar encounters with the solar system. Astron. Astrophys. 379, 634-659.
Bailer-Jones, C. 2015. Astron. Astrophys. 575, article A35.
Bobylev, V. V. 2010. Searching for stars closely encountering with the solar system. Astron. Letters. 36 (3), 220-226.
Napier, W. 2006. Evidence for cometary bombardment episodes. Mon. Not. Roy. Astron. Soc. 366, 977-982.
Schaller, M., Fung, M., Wright, J., Katz, M., and Kent, D. Impact ejecta at the Paleocene-Eocene boundary. Science, 354, 225-229.
Farley, K., Montanari, A., Shoemaker, E., and Shoemaker, C. 1998. Geochemical evidence for a comet shower in the late Eocene. Science, 280, 1250-1253.
Beech, M. 2008. Rejuvenating the Sun and Avoiding Other Global Catastrophes. Springer, New York.
SIMBAD astronomical database: http://simbad.u-strasbg.fr/simbad/.
Lang, K. R. 1992. Astrophysical Data. Springer-Verlag, New York. pp. 132-145.
Gontcharov, G. 2006. Pulkovo Compilation of radial velocities of 35,495 Hipparcos stars in a common system. Astron. Astrophys. Trans. 25, 145-148.
Clube, S., Napier, W. 1984. Comet capture from molecular clouds: a dynamical constraint on star and planet formation. Mon. Not. Roy. Astron. Soc. 208, 575-588.
Hills, J. 1981. Comet showers and the steady-state in-fall of comets from the Oort Cloud. Astron. J. 86, 1730-1740.
van Leewen, F. 2007. Validation of the new Hipparcos reduction. Astron. Astrophys. 474, 653-664.
Duncan, M., Quinn, T., and Tremaine, S. 1987. The formation and extent of the solar system comet cloud. Astron. J. 94, 1330-1338.
Weissman, P. R. 1990. The Oort cloud. Nature, 344, 825-830.
Dones, L., Weissman, P., Levison, H., and Duncan, M. 2004. Oort cloud formation and dynamics. In Star Formation in the Interstellar Medium: in honour of David Hollenbach, Chris McKee and Frank Shu. ASP Conference Series, volume 323.
Howe, A., and Rafikov, R. 2014. Probing Oort cloud and local interstellar medium properties via dust produced in cometary collisions. Ap. J. 781, article 52.
Andrews, A. 1991. Investigation of micro-flaring and secular quasi-periodic variations in dMe flare stars. Astron. Astrophys. 245, 219-231.
Beech, M. 2011. Exploring alpha-Centauri: from planets, to a cometary cloud, and impact flares on Proxima. The Observatory, 131, 212-224.
Brown, J., Carlson, R., and Toner, M. 2015. Destruction and observational signatures of sun-impacting comets. Ap. J. 807, article 165.
Candelaresi, S., Hillier, A., Maehara, H., Brandenburg, A., and Shibata, K. 2014. Superflare occurrence and energies on G, K and M type stars. Ap. J. 792, article 67.
Landin, N., Mendes, L., and Vaz, L. 2010. Theoretical values of convective turnover times and Rossby numbers for solar-like, pre-main sequence stars. Astron. Astrophys. 510, article 46.
Stern, A., and Shull, J. 1988. The influence of supernovae and passing stars on comets in the Oort cloud. Nature, 332, 407-411.
Steel, D. 1993. Collisions in the solar system – V. Terrestrial impact probabilities for parabolic comets. Mon. Not. Roy. Astron. Soc. 264, 813-817.
Bostrom, N., and Ćirković, M. 2008. Global Catastrophic Risks. Oxford University press.