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The solar proxy κ1 Cet and the planetary habitability around the young Sun

Published online by Cambridge University Press:  12 September 2017

J.-D. do Nascimento Jr.
Affiliation:
Univ. Federal do Rio G. do Norte, UFRN, Dep. de Fisica, CP 1641, 59072-970, Natal, RN, Brazil: [email protected] Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge MA 02138, US
A. A. Vidotto
Affiliation:
Observatoire de Genève, 51 ch. des Maillettes, CH-1290, Switzerland School of Physics, Trinity College Dublin, Dublin 2, Ireland
P. Petit
Affiliation:
Univ. de Toulouse, UPS-OMP, IRAP, CNRS, 14 Av. E. Belin, F-31400 Toulouse, France
C. Folsom
Affiliation:
Univ. Grenoble Alpes, IPAG, F-38000 Grenoble, France
G. F. Porto de Mello
Affiliation:
Observ. do Valongo, UFRJ, L do Pedro Antoio, 43 20080-090, RJ, Brazil
S. Meibom
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge MA 02138, US
X. C. Abrevaya
Affiliation:
Inst. de Astronom y Fica del Espacio (IAFE), UBA CONICET, Buenos Aires, Argentina
I. Ribas
Affiliation:
Inst. de Ciències de l’Espai, C. de Can Magrans, s/n, Campus UAB, 08193 Bellaterra, Spain
M. Castro
Affiliation:
Univ. Federal do Rio G. do Norte, UFRN, Dep. de Fisica, CP 1641, 59072-970, Natal, RN, Brazil: [email protected]
S. C. Marsden
Affiliation:
CESCR, Univ. of Southern Queensland, Toowoomba, 4350, Australia
J. Morin
Affiliation:
LUPM-UMR5299, U. Montpellier, Montpellier, F-34095, France
S. V. Jeffers
Affiliation:
I. für Astrophysik, G.-August-Univ., D-37077, Goettingen, Germany
E. Guinan
Affiliation:
Univ. of Villanova, Astron. Department, PA 19085 Pennsylvania, US
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Abstract

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Among the solar proxies, κ1 Cet, stands out as potentially having a mass very close to solar and a young age. We report magnetic field measurements and planetary habitability consequences around this star, a proxy of the young Sun when life arose on Earth. Magnetic strength was determined from spectropolarimetric observations and we reconstruct the large-scale surface magnetic field to derive the magnetic environment, stellar winds, and particle flux permeating the interplanetary medium around κ1 Cet. Our results show a closer magnetosphere and mass-loss rate 50 times larger than the current solar wind mass-loss rate when Life arose on Earth, resulting in a larger interaction via space weather disturbances between the stellar wind and a hypothetical young-Earth analogue, potentially affecting the 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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2017 

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