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20 April 2024 |
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MOVES I. The evolving magnetic field of the planet-hosting star HD189733 | | R. Fares
; V. Bourrier
; A.A. Vidotto
; C. Moutou
; M.M. Jardine
; P. Zarka
; Ch. Helling
; A. Lecavelier des Etangs
; J. Llama
; T. Louden
; P.J. Wheatley
; D. Ehrenreich
; | | Date: |
Thu, 22 Jun 2017 11:31:42 GMT (1817kb,D) | | Abstract: | HD189733 is an active K dwarf that is, with its transiting hot Jupiter, among
the most studied exoplanetary systems. In this first paper of the
Multiwavelength Observations of an eVaporating Exoplanet and its Star (MOVES)
program, we present a 2-year monitoring of the large-scale magnetic field of
HD189733. The magnetic maps are reconstructed for five epochs of observations,
namely June-July 2013, August 2013, September 2013, September 2014, and July
2015, using Zeeman-Doppler Imaging. We show that the field evolves along the
five epochs, with mean values of the total magnetic field of 36, 41, 42, 32 and
37 G, respectively. All epochs show a toroidally-dominated field. Using
previously published data of Moutou et al. 2007 and Fares et al. 2010, we are
able to study the evolution of the magnetic field over 9 years, one of the
longest monitoring campaign for a given star. While the field evolved during
the observed epochs, no polarity switch of the poles was observed. We calculate
the stellar magnetic field value at the position of the planet using the
Potential Field Source Surface extrapolation technique. We show that the
planetary magnetic environment is not homogeneous over the orbit, and that it
varies between observing epochs, due to the evolution of the stellar magnetic
field. This result underlines the importance of contemporaneous
multi-wavelength observations to characterise exoplanetary systems. Our
reconstructed maps are a crucial input for the interpretation and modelling of
our MOVES multi-wavelength observations. | | Source: | arXiv, 1706.7262 | | Services: | Forum | Review | PDF | Favorites | |
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