188 citations · 1.1k across the 21 of their papers we have counts for
23 papers
Evolving stellar wind environment around M dwarfs and its influence on magnetic star-planet interactions
Szymon Petyniak, Stefano Bellotti, Aline Vidotto +4
M dwarfs are the most abundant group of stars in the Galaxy and they are expected to host a large number of exoplanets orbiting in the habitable zone. It is believed that stellar w…
SPIRou near-infrared spectropolarimetry of the ultra-hot Jupiter KELT-9b: tentative detection of the planet magnetic field
Alexis Lavail, Florian Debras, David Rogé Royo +23
Exoplanetary magnetic fields govern atmospheric escape and circulation but have eluded detection in close-in planets. In the ultra-hot Jupiter KELT-9b, atmospheric dynamo is predic…
Twenty-Five Years of Accretion onto the Classical T Tauri Star TW Hya
Gregory J. Herczeg, Yuguang Chen, Jean-Francois Donati +39
Accretion plays a central role in the physics that governs the evolution and dispersal of protoplanetary disks. The primary goal of this paper is to analyze the stability over time…
Magnetohydrostatic modelling of stellar coronae
David MacTaggart, Scott Gregory, Thomas Neukirch +1
We introduce to the stellar physics community a method of modelling stellar coronae that can be considered to be an extension of the potential field. In this approach, the magnetic…
Modelling the Hidden Magnetic Field of Low-Mass Stars
P. Lang, M. Jardine, J. Morin +4
Zeeman-Doppler imaging is a spectropolarimetric technique that is used to map the large-scale surface magnetic fields of stars. These maps in turn are used to study the structure o…
Classical T Tauri stars: magnetic fields, coronae, and star-disc interactions
C. P. Johnstone, M. Jardine, S. G. Gregory +2
The magnetic fields of young stars set their coronal properties and control their spin evolution via the star-disc interaction and outflows. Using 14 magnetic maps of 10 classical…
Planetary protection in the extreme environments of low-mass stars
A. A. Vidotto, M. Jardine, J. Morin +3
Recent results showed that the magnetic field of M-dwarf (dM) stars, currently the main targets in searches for terrestrial planets, is very different from the solar one, both in t…
Can we predict the magnetic properties of PMS stars from their H-R diagram location?
S. G. Gregory, J. -F. Donati, J. Morin +4
Spectropolarimetric observations combined with tomographic imaging techniques have revealed that all pre-main sequence (PMS) stars host multipolar magnetic fields, ranging from str…
The magnetosphere of the close accreting PMS binary V4046 Sgr AB
S. G. Gregory, V. R. Holzwarth, J. -F. Donati +14
We present a preliminary 3D potential field extrapolation model of the joint magnetosphere of the close accreting PMS binary V4046 Sgr. The model is derived from magnetic maps obta…
The magnetosphere of the close accreting PMS binary V4046 Sgr
S. G. Gregory, V. R. Holzwarth, J. -F. Donati +14
V4046 Sagittarii AB is a close short-period classical T Tauri binary. It is a circularised and synchronised system accreting from a circumbinary disk. In 2009 it was observed as pa…
A small survey of the magnetic fields of planet-host stars
Rim Fares, Claire Moutou, Jean-François Donati +5
Using spectropolarimetry, we investigate the large-scale magnetic topologies of stars hosting close-in exoplanets. A small survey of ten stars has been done with the twin instrumen…
Effects of M dwarf magnetic fields on potentially habitable planets
A. A. Vidotto, M. Jardine, J. Morin +3
We investigate the effect of the magnetic fields of M dwarf (dM) stars on potentially habitable Earth-like planets. These fields can reduce the size of planetary magnetospheres to…
Influence of surface stressing on stellar coronae and winds
M. Jardine, A. A. Vidotto, A. van Ballegooijen +4
The large-scale field of the Sun is well represented by its lowest energy (or potential) state. Recent observations, by comparison, reveal that many solar-type stars show large-sca…
The stellar wind cycles and planetary radio emission of the Tau Boo system
A. A. Vidotto, R. Fares, M. Jardine +5
Tau Boo is an intriguing planet-host star that is believed to undergo magnetic cycles similar to the Sun, but with a duration that is about one order of magnitude smaller than that…
Analytic and numerical models of the 3D multipolar magnetospheres of pre-main sequence stars
S. G. Gregory, J. -F. Donati
Traditionally models of accretion of gas on to T Tauri stars have assumed a dipole stellar magnetosphere, partly for simplicity, but also due to the lack of information about their…
Understanding the Angular Momentum Loss of Low-Mass Stars: The Case of V374 Peg
A. A. Vidotto, M. Jardine, M. Opher +2
Recently, surface magnetic field maps had been acquired for a small sample of active M dwarfs, showing that fully convective stars (spectral types ~M4 and later) host intense (~kG)…
Modelling stellar coronal magnetic fields
Moira Jardine, Jean-Francois Donati, Doris Arzoumanian +1
Our understanding of the structure and dynamics of stellar coronae has changed dramatically with the availability of surface maps of both star spots and also magnetic field vectors…
The contribution of starspots to coronal structure
Doris Arzoumanian, Moira Jardine, Jean-François Donati +2
Significant progress has been made recently in our understanding of the structure of stellar magnetic fields, thanks to advances in detection methods such as Zeeman-Doppler Imaging…
The magnetic fields of forming solar-like stars
S. G. Gregory, M. Jardine, C. G. Gray +1
Magnetic fields play a crucial role at all stages of the formation of low mass stars and planetary systems. In the final stages, in particular, they control the kinematics of in-fa…
Surface magnetic fields on two accreting T Tauri stars: CV Cha and CR Cha
G. A. J. Hussain, A. Collier Cameron, M. M. Jardine +12
We have produced brightness and magnetic field maps of the surfaces of CV Cha and CR Cha: two actively accreting G and K-type T Tauri stars in the Chamaeleon I star-forming cloud w…
Inferring X-ray coronal structures from Zeeman-Doppler images
M. Jardine, K. Wood, A. Collier Cameron +2
We have modelled the X-ray emission from the young rapid rotator AB Doradus (P = 0.514 days) using as a basis Zeeman-Doppler maps of the surface magnetic field. This allows us to r…
The global magnetic topology of AB Doradus
M. Jardine, A. Collier Cameron, J. F. Donati
We have used Zeeman-Doppler maps of the surface field of the young, rapid rotator AB Dor (P = 0.514 days) to extrapolate the coronal field, assuming it to be potential. We find tha…
Modelling surface magnetic field evolution on AB Doradus due to diffusion and surface differential rotation
G. R. Pointer, M. Jardine, A. Collier Cameron +1
From Zeeman Doppler images of the young, rapidly-rotating K0 dwarf AB Doradus, we have created a potential approximation to the observed radial magnetic field and have evolved it o…