Browsing School of Physics by Author "VIDOTTO, ALINE"
Now showing items 1-16 of 16
-
The connection between stellar activity cycles and magnetic field topology
VIDOTTO, ALINE (2016)Zeeman Doppler imaging has successfully mapped the large-scale magnetic fields of stars over a large range of spectral types, rotation periods and ages. When observed over multiple epochs, some stars show polarity reversals ... -
Effects of M dwarf magnetic fields on potentially habitable planets
VIDOTTO, ALINE (2013)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 such an extent that a significant fraction ... -
Estimating stellar wind parameters from low-resolution magnetograms
VIDOTTO, ALINE (2017)Stellar winds govern the angular momentum evolution of solar-like stars throughout their main-sequence lifetime. The efficiency of this process depends on the geometry of the star's magnetic field. There has been a rapid ... -
An evaporating planet in the wind: Stellar wind interactions with the radiatively braked exosphere of GJ 436 b
VIDOTTO, ALINE (2016)Observations of the warm Neptune GJ 436 b were performed with HST/STIS at three different epochs (2012, 2013, 2014) in the stellar Lyman-α line. They showed deep, repeated transits that were attributed to a giant exosphere ... -
High surface magnetic field in red giants as a new signature of planet engulfment?
VIDOTTO, ALINE (2016)Context. Red giant stars may engulf planets. This may increase the rotation rate of their convective envelope, which could lead to strong dynamo-triggered magnetic fields. Aims. We explore the possibility of generating ... -
The hot Jupiter and magnetic activity of V830 Tau
VIDOTTO, ALINE (2017)We report results of an extended spectropolarimetric and ph otometric monitoring of the weak- line T Tauri star V830 Tau and its recently-detected newborn close-in giant planet. Our obser- vations, carried out within ... -
Incorporating magnetic field observations in wind models of low-mass stars
VIDOTTO, ALINE (2014)Stellar winds of cool, main-sequence stars are very tenuous and difficult to observe. Despite carrying away only a small amount of the stellar mass, they are important for regulating the rotation of the star and, ... -
Is the activity level of HD80606 influenced by its eccentric planet?
VIDOTTO, ALINE (2016)Aims. Several studies suggest that the activity level of a planet-host star can be influenced by the presence of a close-by orbiting planet. Moreover, the interaction mechanisms that have been proposed, magnetic interaction ... -
Magnetic activity and hot Jupiters of young Suns: the weak-line T Tauri stars V819 Tau and V830 Tau
VIDOTTO, ALINE (2015)We report results of a spectropolarimetric and photometric monitoring of the weak-line T Tauri stars (wTTSs) V819 Tau and V830 Tau within the MaTYSSE programme, involving the ESPaDOnS spectropolarimeter at the Canada-France-Hawaii ... -
Magnetic fields on young, moderately rotating Sun-like stars II. EK Draconis (HD 129333)
VIDOTTO, ALINE (2017)The magnetic fields, activity and dynamos of young solar-type stars can be empirically studied using time-series of spectropolarimetric observations and tomographic imaging techniques such as Doppler imaging and Zeeman ... -
Modelling the magnetic activity and filtering radial velocity curves of young suns: The weak-line T tauri star LkCa 4
VIDOTTO, ALINE (2014)We report results of a spectropolarimetric and photometric monitoring of the weak-line T Tauri star LkCa4 within the MaTYSSE programme, involving ESPaDOnS at the Canada-France-Hawaii Telescope. Despite an age of only 2Myr ... -
On the effects of stellar winds on the magnetospheres and potential habitability of exoplanets
VIDOTTO, ALINE (2014)Context: The principle definition of habitability for exoplanets is whether they can sustain liquid water on their surfaces, i.e. that they orbit within the habitable zone. However, the planet's magnetosphere should also ... -
A solar-like magnetic cycle on the mature K-dwarf 61 Cygni A (HD 201091)
VIDOTTO, ALINE (2016)Context. The long-term monitoring of magnetic cycles in cool stars is a key diagnostic in understanding how dynamo generation and amplification of magnetic fields occur in stars similar in structure to the Sun. Aims. ... -
Star-planet interactions: I. Stellar rotation and planetary orbits
VIDOTTO, ALINE (2016)Context. As a star evolves, planet orbits change over time owing to tidal interactions, stellar mass losses, friction and gravitational drag forces, mass accretion, and evaporation on/by the planet. Stellar rotation modifies ... -
Star-planet interactions: II. is planet engulfment the origin of fast rotating red giants?
VIDOTTO, ALINE (2016)Context. Fast rotating red giants in the upper part of the red giant branch have surface velocities that cannot be explained by single star evolution. Aims. We check whether tides between a star and a planet followed ... -
Winds of Planet Hosting Stars
VIDOTTO, ALINE (2015)The field of exoplanetary science is one of the most rapidly growing areas of astrophysical research. As more planets are discovered around other stars, new techniques have been developed that have allowed ...