English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

HD189733 is an active K dwarf that is, with its transiting hot Jupiter, amongthe most studied exoplanetary systems. In this first paper of theMultiwavelength Observations of an eVaporating Exoplanet and its Star (MOVES)program, we present a 2-year monitoring of the large-scale magnetic field ofHD189733. The magnetic maps are reconstructed for five epochs of observations,namely June-July 2013, August 2013, September 2013, September 2014, and July2015, using Zeeman-Doppler Imaging. We show that the field evolves along thefive epochs, with mean values of the total magnetic field of 36, 41, 42, 32 and37 G, respectively. All epochs show a toroidally-dominated field. Usingpreviously published data of Moutou et al. 2007 and Fares et al. 2010, we areable to study the evolution of the magnetic field over 9 years, one of thelongest monitoring campaign for a given star. While the field evolved duringthe observed epochs, no polarity switch of the poles was observed. We calculatethe stellar magnetic field value at the position of the planet using thePotential Field Source Surface extrapolation technique. We show that theplanetary magnetic environment is not homogeneous over the orbit, and that itvaries between observing epochs, due to the evolution of the stellar magneticfield. This result underlines the importance of contemporaneousmulti-wavelength observations to characterise exoplanetary systems. Ourreconstructed maps are a crucial input for the interpretation and modelling ofour MOVES multi-wavelength observations.

MOVES I. The evolving magnetic field of the planet-hosting star HD189733