Magnetic field and wind of Kappa Ceti: toward the planetary habitability of the young sun when life arose on earth

do Nascimento, J.-D. and Vidotto, A. A. and Petit, P. and Folsom, C. and Castro, M. and Marsden, S. C. and Morin, J. and Porto de Mello, G. F. and Meibom, S. and Jeffers, S. V. and Guinan, E. and Ribas, I. (2016) Magnetic field and wind of Kappa Ceti: toward the planetary habitability of the young sun when life arose on earth. The Astrophysical Journal Letters, 820 (1). L15 (1)-L15 (6). ISSN 2041-8205

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Abstract

We report magnetic field measurements for κ1 Cet, a proxy of the young Sun when life arose on Earth. We carry out an analysis of the magnetic properties determined from spectropolarimetric observations and reconstruct the
large-scale surface magnetic field to derive the magnetic environment, stellar winds, and particle flux permeating
the interplanetary medium around k1 Cet. Our results show a closer magnetosphere and mass-loss rate of M = 9.7 ́ 10-13 M yr-1, i.e., a factor of 50 times larger than the current solar wind mass-loss rate, resulting in a larger interaction via space weather disturbances between the stellar wind and a hypothetical young-Earth analogue, potentially affecting the planet’s habitability. Interaction of the wind from the young Sun with the planetary ancient magnetic field may have affected the young Earth and its life conditions.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version made accessible, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 10 Mar 2017 02:20
Last Modified: 12 May 2017 06:03
Uncontrolled Keywords: stars, magnetic field, winds, outflows,HD 20630, HIP 15457
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.3847/2041-8205/820/1/L15
URI: http://eprints.usq.edu.au/id/eprint/30370

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