MOVES V. Modelling star-planet magnetic interactions of HD 189733
arXiv:2203.10956 · doi:10.1093/mnras/stac778
Abstract
Magnetic interactions between stars and close-in planets may lead to a detectable signal on the stellar disk. HD 189733 is one of the key exosystems thought to harbor magnetic interactions, which may have been detected in August 2013. We present a set of twelve wind models at that period, covering the possible coronal states and coronal topologies of HD 189733 at that time. We assess the power available for the magnetic interaction and predict its temporal modulation. By comparing the predicted signal with the observed signal, we find that some models could be compatible with an interpretation based on star-planet magnetic interactions. We also find that the observed signal can be explained only with a stretch-and-break interaction mechanism, while that the Alfvén wings scenario cannot deliver enough power. We finally demonstrate that the past observational cadence of HD 189733 leads to a detection rate of only between 12 to 23%, which could explain why star-planet interactions have been hard to detect in past campaigns. We conclude that the firm confirmation of their detection will require dedicated spectroscopic observations covering densely the orbital and rotation period, combined with scarcer spectropolarimetric observations to assess the concomitant large-scale magnetic topology of the star.
16 pages, 8 figures, 4 tables, accepted for publication in MNRAS
References in corpus (30)
- PLUTO: a Numerical Code for Computational Astrophysics
- Self-consistent Coronal Heating and Solar Wind Acceleration from Anisotropic Magnetohydrodynamic Turbulence
- The On/Off Nature of Star-Planet Interactions
- The effect of magnetic topology on thermally-driven winds: towards a general formulation of the braking law
- Stellar activity of planetary host star HD 189733
- Hubble PanCET: An extended upper atmosphere of neutral hydrogen around the warm Neptune GJ 3470 b
- The Transit Light Curve Project. V. System Parameters and Stellar Rotation Period of HD 189733
- Measurement of the Spin-Orbit Alignment in the Exoplanetary System HD 189733
- Magnetic field strengths of hot Jupiters from signals of star-planet interactions
- The search for radio emission from the exoplanetary systems 55 Cancri, Andromedae, and Boötis using LOFAR beam-formed observations
- Spectropolarimetric observations of the transiting planetary system of the K dwarf HD 189733
- The population of M dwarfs observed at low radio frequencies
- Theoretical mass loss rates of cool main-sequence stars
- Planet-induced radio emission from the coronae of M dwarfs: the case of Prox Cen and AU Mic
- Simulating the environment around planet-hosting stars - II. Stellar winds and inner astrospheres
- Age dependence of wind properties for solar type stars: a 3d study
- Assessing magnetic torques and energy fluxes in close-in star-planet systems
- ExoClock project II: A large-scale integrated study with 180 updated exoplanet ephemerides
- Effects of the stellar wind on the Ly-alpha transit of close-in planets
- MOVES I. The evolving magnetic field of the planet-hosting star HD189733
- Tuning the Exo-Space Weather Radio for Stellar Coronal Mass Ejections
- MOVES III. Simultaneous X-ray and ultraviolet observations unveiling the variable environment of the hot Jupiter HD 189733b
- MOVES II. Tuning in to the radio environment of HD189733b
- Magnetic and tidal migration of close-in planets. Influence of secular evolution on their population
- A new look at Spitzer primary transit observations of the exoplanet HD189733b
- Tidal migration of hot Jupiters: introducing the impact of gravity wave dissipation
- MHD study of planetary magnetospheric response during extreme solar wind conditions: Earth and exoplanet magnetospheres applications
- Understanding the atmospheric properties and chemical composition of the ultra-hot Jupiter HAT-P-7b: III. Changing ionisation and the emergence of an ionosphere
- Modeling Solar Wind Variations over an 11-yr Cycle with Alfvén Wave Dissipation: a Parameter Study
- Solar wind rotation rate and shear at coronal hole boundaries, possible consequences for magnetic field inversions
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- The space weather around the exoplanet GJ 436 b. II. Stellar wind-exoplanet interactions
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- Follow-up LOFAR observations of the Boötis exoplanetary system
- Magnetized winds of M-type stars and star-planet magnetic interactions: uncertainties and modeling strategy
- Star-Planet Interactions: A Computational View
- Exoplanet Radio Transits as a Probe for Exoplanetary Magnetic Fields -- Time-dependent MHD Simulations
- Stellar wind impact on early atmospheres around unmagnetized Earth-like planets
- A circularly polarized low-frequency radio burst from the exoplanetary system HD 189733
- On stellar hotspots due to star-planet magnetic interactions: How much power can actually be transmitted to the chromosphere?
- Star-planet magnetic interactions in photoevaporating exoplanets: enhanced power due to atmospheric escape
- ExoplANETS-A: A VO database for host stars and planetary systems: The effect of XUV on planet atmospheres