Cosmic Rays near Proxima Centauri b


The discovery of a terrestrial planet orbiting Proxima Centauri has led to a lot of papers discussing the possible conditions on this planet. Since the main factors determining space weather in the Solar System are the solar wind and cosmic rays (CRs), it seems important to understand what the parameters of the stellar wind, Galactic and stellar CRs near exoplanets are. Based on the available data, we present our estimates of the stellar wind velocity and density, the possible CR fluxes and fluences near Proxima b. We have found that there are virtually no Galactic CRs near the orbit of Proxima b up to particle energies ~1 TeV due to their modulation by the stellar wind. Nevertheless, more powerful and frequent flares on Proxima Centauri than those on the Sun can accelerate particles to maximum energies ~3150αβ GeV (α, β < 1). Therefore, the intensity of stellar CRs in the astrosphere may turn out to be comparable to the intensity of low-energy CRs in the heliosphere.

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  1. 1.

    G. Anglada-Escude, P. J. Amado, J. Barnes, Z. M. Berdias, R. P. Butler, G. Coleman, I. de La Cueva, et al., Nature (London, U.K.) 536, 437 (2016).

    ADS  Article  Google Scholar 

  2. 2.

    D. Atri, Mon. Not. R. Astron. Soc. 465, L34 (2017).

    ADS  Article  Google Scholar 

  3. 3.

    D. Atri, B. Hariharan, and J.M. Grießmeier, Astrobiology 13, 910 (2013).

    ADS  Article  Google Scholar 

  4. 4.

    L. A. Balona, Mon. Not. R. Astron. Soc. 447, 2714 (2015).

    ADS  Article  Google Scholar 

  5. 5.

    S. Chapman, Proc. R. Soc. London A 253, 462 (1959).

    ADS  Article  Google Scholar 

  6. 6.

    O. Cohen, J. J. Drake, and J. Kóta, Astrophys. J. 760, 85 (2012).

    ADS  Article  Google Scholar 

  7. 7.

    R. A. Davenport, D. M. Kipping, D. Sasselov, J. M. Matthews, and C. Cameron, Astrophys. J. 829, L31 (2016).

    ADS  Article  Google Scholar 

  8. 8.

    P. J. Edwards and M. McQueen, in Proceedings of the 12th International Cosmic Ray Conference ICRC, Hobart, Tasmania, 1971, Vol. 1, p. 323.

    ADS  Google Scholar 

  9. 9.

    P. S. Freier and W. B. Webber, J. Geophys. Res. 68, 1605 (1963).

    ADS  Article  Google Scholar 

  10. 10.

    C. Garraffo, J. J. Drake, and O. Cohen, Astrophys. J. 833, L4 (2016).

    ADS  Article  Google Scholar 

  11. 11.

    J. M. Grießmeier, A. Stadelmann, U. Motschmann, N. K. Belisheva, H. Lammer, and H. K. Biernat, Astrobiology 5, 587 (2005).

    ADS  Article  Google Scholar 

  12. 12.

    J.M. Grießmeier, F. Tabataba-Vakili, A. Stadelmann, J. L. Grenfell, and D. Atri, Astron. Astrophys. 581, A44 (2015).

    ADS  Article  Google Scholar 

  13. 13.

    J.M. Grießmeier, F. Tabataba-Vakili, A. Stadelmann, J. L. Grenfell, and D. Atri, Astron. Astrophys. 587, A159 (2016).

    ADS  Article  Google Scholar 

  14. 14.

    M. Güdel, M. Audard, F. Reale, S. L. Skinner, and J. L. Linsky, Astron. Astrophys. 416, 713 (2004).

    ADS  Article  Google Scholar 

  15. 15.

    B. M. Haisch, J. L. Linsky, P. L. Bornmann, R. E. Stencel, S. K. Antiochos, L. Golub, and G. S. Vaiana, Astrophys. J. 267, 280 (1983).

    ADS  Article  Google Scholar 

  16. 16.

    B. Haisch, A. Antunes, and J. H. M. N. Schmitt, Science 268, 1327 (1995).

    ADS  Article  Google Scholar 

  17. 17.

    Yu. S. Kopysov and Yu. I. Stozhkov, in Proceedings of the 29th International Cosmic Ray Conference, Pune, 2005, Vol. 3, p. 41.

    Google Scholar 

  18. 18.

    G. A. Kovaltsov, I. G. Usoskin, E.W. Cliver, W. F. Dietrich, and A. J. Tylka, Solar Phys. 289, 4691 (2014).

    ADS  Article  Google Scholar 

  19. 19.

    K. R. Lang, Astrophysical Formulae, 2nd ed., Springer Study Edition (Springer, Berlin, 1980), p. 783.

    Book  Google Scholar 

  20. 20.

    A. C. B. Lovell, Phil. Trans. R. Soc., A 277, 489 (1974).

    ADS  Article  Google Scholar 

  21. 21.

    D. J. Mullan, Astrophys. J. 234, 588 (1979).

    ADS  Article  Google Scholar 

  22. 22.

    E. N. Parker, Astrophys. J. 128, 664 (1958a).

    ADS  Article  Google Scholar 

  23. 23.

    E. N. Parker, Phys. Rev. 110, 1445 (1958b).

    ADS  Article  Google Scholar 

  24. 24.

    A. Reiners and G. Basri, Astron. Astrophys. 489, L45 (2008).

    ADS  Article  Google Scholar 

  25. 25.

    K. Scherer, A. van der Schy, D. J. Bomans, S. E. S. Ferreira, H. Fichtner, J. Kleimann, R. D. Strauss, K. Weis, T. Wiengarten, and T. D. J. Wodzinski, Astron. Astrophys. 576, A97 (2015).

    Article  Google Scholar 

  26. 26.

    K. Scherer, H. Fichtner, and O. Stawicki, J. Atmos. Solar-Terr. Phys. 64, 795 (2002).

    ADS  Article  Google Scholar 

  27. 27.

    Yu. I. Stozhkov, Bull.Russ.Acad. Sci.: Phys. 75, 323 (2011).

    Article  Google Scholar 

  28. 28.

    A. Struminsky and A. Sadovski, APS Conf. Ser. (in press).

  29. 29.

    F. Tabataba-Vakili, J. L. Grenfell, J. M. Grießmeier, and H. Rauer, Astron. Astrophys. 585, A96 (2016).

    ADS  Article  Google Scholar 

  30. 30.

    A. D. Thackeray, Mon. Not. Astron. Soc. South Africa 9, 9 (1950).

    ADS  Google Scholar 

  31. 31.

    A. Unsöld, in Proceedings of the 4th IAU Symposium, 1957, p. 238.

    Google Scholar 

  32. 32.

    A.A. Vidotto, S. G. Gregory, M. Jardine, J. F. Donati, P. Petit, J. Morin, C. P. Folsom, J. Bouvier, et al., Mon. Not. R. Astron. Soc. 441, 2361 (2014).

    ADS  Article  Google Scholar 

  33. 33.

    A. R. Walker, Mon. Not. R. Astron. Soc. 195, 1029 (1981).

    ADS  Article  Google Scholar 

  34. 34.

    B. J. Wargelin, S. H. Saar, G. Pojmałski, J. J. Drake, and V. L. Kashyap, Mon. Not. R. Astron. Soc. 464, 3281 (2017).

    ADS  Article  Google Scholar 

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Correspondence to A. M. Sadovski.

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Original Russian Text © A.M. Sadovski, A.B. Struminsky, A. Belov, 2018, published in Pis’ma v Astronomicheskii Zhurnal, 2018, Vol. 44, No. 5, pp. 347–353.

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Sadovski, A.M., Struminsky, A.B. & Belov, A. Cosmic Rays near Proxima Centauri b. Astron. Lett. 44, 324–330 (2018).

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  • exoplanets
  • cosmic rays
  • astrosphere