The large-scale axisymmetric magnetic topology of avery-low-mass fully-convective star

Abstract

Understanding how cool stars produce magnetic fields within their interiors is crucial for predicting the impact of such fields, such as the activity cycle of the Sun. In this respect, studying fully convective stars enables us to investigate the role of convective zones in magnetic field generation. We produced a magnetic map of a rapidly rotating, very-low-mass, fully convective dwarf through tomographic imaging from time series of spectropolarimetric data. Our results, which demonstrate that fully convective stars are able to trigger axisymmetric large-scale poloidal fields without differential rotation, challenge existing theoretical models of field generation in cool stars.

arXiv comment17 pages, 4 figures, supplementary online material (including 2 figures)

References in corpus (6)

• First radius measurements of very low mass stars with the VLTI
• Simulations of core convection in rotating A-type stars: Magnetic dynamo action
• Temporal fluctuations in the differential rotation of cool active stars
• X-ray properties of active M dwarfs as observed by XMM-Newton
• Structure and evolution of low-mass stars
• Simulation of non-Gaussian CMB maps

Cited by in corpus (147)

• Magnetic fields of non-degenerate stars
• Large-scale magnetic topologies of late M dwarfs
• Large-scale magnetic topologies of mid-M dwarfs
• The Magnetic Fields of Classical T Tauri Stars
• Evolution of low-mass star and brown dwarf eclipsing binaries
• Large-scale magnetic topologies of early M dwarfs
• Simulations of dynamo action in fully convective stars
• Science with the Murchison Widefield Array
• On magnetic instabilities and dynamo action in stellar radiation zones
• The First Direct Measurements of Magnetic Fields on Very Low-Mass Stars
• Chromospheric Activity, Rotation, and Rotational Braking in M and L Dwarfs
• Confirmation of the Electron Cyclotron Maser Instability as the Dominant Source of Radio Emission from Very Low Mass Stars and Brown Dwarfs
• Launching of Conical Winds and Axial Jets from the Disk-Magnetosphere Boundary: Axisymmetric and 3D Simulations
• Radio Observations of a Large Sample of Late-M, L, and T Dwarfs: The Distribution of Magentic Field Strengths
• Persistent Magnetic Wreaths in a Rapidly Rotating Sun
• Periodic Bursts of Coherent Radio Emission from an Ultracool Dwarf
• Magnetospheric accretion on the T Tauri star BP Tauri
• Observations of Cool-Star Magnetic Fields
• A Bcool magnetic snapshot survey of solar-type stars
• Effects of M dwarf magnetic fields on potentially habitable planets
• The stable magnetic field of the fullly-convective star V374 Peg
• M-dwarf stellar winds: the effects of realistic magnetic geometry on rotational evolution and planets
• Rotational Modulation of the Radio Emission from the M9 Dwarf TVLM 513-46546: Broadband Coherent Emission at the Substellar Boundary?
• Magnetic fields of M dwarfs
• Explaining the coexistence of large-scale and small-scale magnetic fields in fully convective stars
• Auroral radio emission from late L and T dwarfs: A new constraint on dynamo theory in the substellar regime
• Detection of a planetary system orbiting the eclipsing polar HU Aqr
• The Radio Activity-Rotation Relation of Ultracool Dwarfs
• Dipolar versus multipolar dynamos: the influence of the background density stratification
• Periodic Radio and H-alpha Emission from the L Dwarf Binary 2MASSW J0746425+200032: Exploring the Magnetic Field Topology and Radius of an L Dwarf
• CARMENES input catalogue of M dwarfs IV. New rotation periods from photometric time series
• The Rossiter-McLaughlin effect in Exoplanet Research
• The Strongest Magnetic Fields on the Coolest Brown Dwarfs
• The magnetic field of the planet-hosting star $\tau$ Bootis
• Modeling the RV jitter of early M dwarfs using tomographic imaging
• Differential rotation of main-sequence dwarfs and its dynamo-efficiency
• Testing the Disk Regulation Paradigm with Spitzer Observations. II. A Clear Signature of Star-Disk Interaction in NGC 2264 and the Orion Nebula Cluster
• What controls the magnetic geometry of M dwarfs?
• Powerful Winds from Low-Mass Stars: V374 Peg
• Accretion to Stars with Non-dipole Magnetic Fields
• The Arecibo Detection of the Coolest Radio-flaring Brown Dwarf
• Short-lived spots in solar-like stars as observed by CoRoT
• The Effect of Combined Magnetic Geometries on Thermally Driven Winds II: Dipolar, Quadrupolar and Octupolar Topologies
• Magnetic Inflation and Stellar Mass II: On the Radii of Single, Rapidly Rotating, Fully Convective M Dwarf Stars
• SPIRou Input Catalogue: Global properties of 440 M dwarfs observed with ESPaDOnS at CFHT
• A Panchromatic View of Brown Dwarf Aurorae
• Complex magnetic topology and strong differential rotation on the low-mass T Tauri star V2247 Oph
• Modelling the magnetic activity & filtering radial velocity curves of young Suns: the weak-line T Tauri star LkCa 4
• Magnetic activity and hot Jupiters of young Suns: the weak-line T Tauri stars V819 Tau and V830 Tau
• The CARMENES search for exoplanets around M dwarfs: Radial-velocity variations of active stars in visual-channel spectra
• SPIRou Input Catalog: Activity, Rotation and Magnetic Field of Cool Dwarfs
• Using the Galactic Dynamics of M7 Dwarfs to Infer the Evolution of Their Magnetic Activity
• Probability of CME Impact on Exoplanets Orbiting M Dwarfs and Solar-Like Stars
• Weak and Strong Field Dynamos: from the Earth to the stars
• Rotation and activity of pre-main-sequence stars
• The magnetic field vector of the Sun-as-a-star
• Periodic Radio Emission from the M7 Dwarf 2MASS J13142039+1320011: Implications for the Magnetic Field Topology
• Exploring the magnetic field complexity in M dwarfs at the boundary to full convection
• A scaling relationship for non-thermal radio emission from ordered magnetospheres: from the top of the Main Sequence to planets
• Relations between dynamo-region geometry and the magnetic behavior of stars and planets
• Complex Rotational Modulation of Rapidly Rotating M-Stars Observed with TESS
• Periodic Optical Variability of Radio Detected Ultracool Dwarfs
• Modelling the Hidden Magnetic Field of Low-Mass Stars
• The Effect of Magnetic Variability on Stellar Angular Momentum Loss I: The Solar Wind Torque During Sunspot Cycles 23 & 24
• Could a change in magnetic field geometry cause the break in the wind-activity relation?
• The large-scale magnetic field of Proxima Centauri near activity maximum
• Observing the simulations: Applying ZDI to 3D non-potential magnetic field simulations
• Magnetic Field Topology in Low-Mass Stars: Spectropolarimetric Observations of M Dwarfs
• Rotational Velocities of Individual Components in Very Low Mass Binaries
• Discovery of Radio Emission from the Tight M8 Binary: LP 349-25
• A highly unequal-mass eclipsing M-dwarf binary in the WFCAM Transit Survey
• Radio Flaring from the T6 Dwarf WISEPC J112254.73+255021.5 with A Possible Ultra-short Periodicity
• A sudden change of the global magnetic field of the active M dwarf AD Leo revealed by full Stokes spectropolarimetric observations
• Modelling the molecular Zeeman effect in M-dwarfs: methods and first results
• Magneto-Convection and Lithium Age Estimates of the βPictoris Moving Group
• Spectropolarimetry of the Classical T Tauri Star TW Hydrae
• Three-dimensional simulations of rotationally-induced line variability from a Classical T Tauri star with a misaligned magnetic dipole
• TOI-1759 b: a transiting sub-Neptune around a low mass star characterized with SPIRou and TESS
• On the Diversity of M-Star Astrospheres and the Role of Galactic Cosmic Rays Within
• Investigating magnetic activity in very stable stellar magnetic fields: long-term photometric and spectroscopic study of the fully convective M4 dwarf V374 Peg
• Orbital periods of cataclysmic variables identified by the SDSS. II. Measurements for six objects, including two eclipsing systems
• 1E161348-5055 in the Supernova Remnant RCW 103: A Magnetar in a Young Low Mass Binary System?
• Theoretical limits on magnetic field strengths in low-mass stars
• TOI-3884 b: A rare 6-R${}_{\oplus }$ planet that transits a low-mass star with a giant and likely polar spot
• Diagnosing large-scale stellar magnetic fields using PCA on spectropolarimetric data
• Magnetic Field of the Active Planet-hosting M Dwarf AU Mic
• Modelling the radio pulses of an ultracool dwarf
• The contribution of starspots to coronal structure
• Modelling stellar coronae from surface magnetograms: the role of missing magnetic flux
• Deriving stellar inclination of slow rotators using stellar activity
• Infrared Spectroscopic Observations of the Secondary Stars of Short Period Sub-Gap Cataclysmic Variables
• First measurement of the magnetic field on FK Com and its relation to the contemporaneous starspot locations
• Towards understanding dynamo action in M dwarfs
• Theoretical orbital period distributions of cataclysmic variables above the period gap: effects of circumbinary disks
• Coronal Structure of Low-Mass Stars
• Simulating radio emission from Low Mass Stars
• Theory of differential rotation and meridional circulation
• Magnetic Doppler imaging considering atmospheric structure modifications due to local abundances: a luxury or a necessity?
• Dynamics of rotation in M dwarfs: Indications for a change in the dynamo regime in stars at the onset of complete convection
• Connecting the large- and the small-scale magnetic fields of solar-like stars
• Long-term monitoring in IC4665: Fast rotation and weak variability in very low mass objects
• Searching for CU Vir-type cyclotron maser from σOri E: The role of the magnetic quadrupole component
• Diagnostic of stellar magnetic fields with cumulative circular polarisation profiles
• Transition from multipolar to dipolar dynamos in stratified systems
• Mapping time-dependent magnetic topologies of active stars
• A quest for activity cycles in low mass stars
• Rotational modulation of the linear polarimetric variability of the cool dwarf TVLM 513$-$46546
• First spectropolarimetric measurement of a brown dwarf magnetic field in molecular bands
• Equation of the field lines of an axisymmetric multipole with a source surface
• Magnetic fields in M dwarfs: rapid magnetic field variability in EV Lac
• Application of a magnetic-field-induced transition in Fe X to solar and stellar coronal magnetic field measurements
• Rapid magnetic flux variability on the flare star CN Leonis
• Small Anisotropy in Stellar Objects in Modified Theories of Gravity
• Hunting for Stellar Coronal Mass Ejections
• Photometric and spectroscopic observations of three rapidly rotating late-type stars: EY Dra, V374 Peg and GSC 02038-00293
• Probing the magnetosphere of the M8.5 dwarf TVLM513-46546 by modelling its auroral radio emission. Hint of star exoplanet interaction?
• The energetic particle environment of a GJ 436 b-like planet
• The energy budget of stellar magnetic fields: comparing non-potential simulations and observations
• Radio emission in a nearby ultracool dwarf binary: a multi-frequency study
• Measurements of the magnetic field strengths at the bases of stellar coronae using the magnetic-field-induced transition theory
• Rotational suppression of the Tayler instability in stellar radiation zones
• Astrophysics in 2006
• Zeeman-Doppler Imaging : Old Problems and New Methods
• Kinetic Simulation of the Electron-Cyclotron Maser Instability: Relaxation of Electron Horseshoe Distributions
• Periodicity search as a tool for disentangling the contaminated colour light curve of CoRoT 102781750
• Can scallop-shell stars trap dust in their magnetic fields?
• Orbital periods of cataclysmic variables identified by the SDSS. VIII. A slingshot prominence in SDSS J003941.06+005427.5?
• Catching the wisps: Stellar mass-loss limits from low-frequency radio observations
• At the Bottom of the Main Sequence: Activity and magnetic fields beyond the threshold to complete convection
• Magnetic coronae of active main-sequence stars
• Short-term spectroscopic monitoring of two cool dwarfs with strong magnetic fields
• Modeling Multi-Wavelength Stellar Astrometry. II. Determining Absolute Inclinations, Gravity Darkening Coefficients, and Spot Parameters of Single Stars with SIM Lite
• Magnetic field observations of low-mass stars
• Accretion discs, low-mass protostars and planets: probing the impact of magnetic fields on stellar formation
• Surface magnetism of cool giant and supergiant stars
• Differential Rotation and Magnetism in Simulations of Fully Convective Stars
• Magnetic field measurements in a sample of Class I and flat-spectrum protostars observed with SPIRou
• A Panchromatic JWST Spectrum of a Giant Starspot on the Fully Convective M-dwarf TOI-3884
• A scaling relationship for non-thermal radio emission from ordered magnetospheres - II. Investigating the efficiency of relativistic electron production in magnetospheres of BA-type stars
• A Gyrochronology and Microvariability Survey of the Milky Way's Older Stars Using Kepler's Two-Wheels Program
• Exploring the magnetic topologies of cool stars
• Stellar mass ejections
• Concluding remarks
• Surface evolution in stable magnetic fields: the case of the fully convective dwarf V374 Peg
• Asteroseismic Analysis of a Red Giant KIC 9145955 by Including the Small-scale Magnetic Fields in the Atmosphere
• What controls the large-scale magnetic fields of M dwarfs?
• The dynamo action for red dwarfs and red giant and supergiant stars