Asymptotic g modes: Evidence for a rapid rotation of the solar core

  title={Asymptotic g modes: Evidence for a rapid rotation of the solar core},
  author={Eric G. Fossat and Patrick Boumier and Thierry Corbard and Janine Provost and David Salabert and François-Xavier Schmider and Alan H. Gabriel and G{\'e}rard Grec and Catherine Renaud and J. M. Robillot and T. Roca-Cort'es and S. Turck-chi{\`e}ze and Roger K Ulrich and M. Lazrek Universit'e Cote d Azur and Cnrs and Laboratoire Lagrange and France. and Institut d'Astrophysique Spatiale and Universite De Paris-sud and Laboratoire Aim Paris-Saclay and CEADRF-CNRS-Univ. Paris Diderot - IRFUSAp and Lab and Departamento de Astrof'isica and Universidad de la Laguna and Spain. and Inst. Astrof. de Canarias and Department of Engineering Physics and Astronomy Department and University of California at Los Angeles and U.S.A. and Lphea Laboratory and Oukaimeden Observatory and Cadi Ayyad University Fssm and Morocco.},
  journal={arXiv: Solar and Stellar Astrophysics},
We present the identification of very low frequency g modes in the asymptotic regime and two important parameters that have long been waited for: the core rotation rate, and the asymptotic equidistant period spacing of these g modes. The GOLF instrument on board the SOHO space observatory has provided two decades of full-disk helioseismic data. In the present study, we search for possible collective frequency modulations that are produced by periodic changes in the deep solar structure. Such… Expand
More about solar g modes
Context. The detection of asymptotic solar g-mode parameters was the main goal of the GOLF instrument onboard the SOHO space observatory. This detection has recently been reported and has identifiedExpand
An astrophysical interpretation of the remarkable g-mode frequency groups of the rapidly rotating γ Dor star, KIC 5608334
The Fourier spectrum of the γ-Dor variable KIC 5608334 shows remarkable frequency groups at ∼3, ∼6, ∼9, and 11–12 d−1. We explain the four frequency groups as prograde sectoral g modes in a rapidlyExpand
Signature of solar g modes in first-order p-mode frequency shifts
Context. Solar gravity modes (g modes) are buoyancy waves that are trapped in the solar radiative zone and have been very difficult to detect at the surface. Solar g modes would complement solarExpand
Deciphering the oscillation spectrum of $\gamma$ Doradus and SPB stars.
The space-based Kepler mission provided four years of highly precise and almost uninterrupted photometry for hundreds of $\gamma$ Doradus stars and tens of SPB stars, finally allowing us to applyExpand
Influence of stellar structure, evolution, and rotation on the tidal damping of exoplanetary spin-orbit angles
It is debated whether close-in giant planets can form in-situ and if not, which mechanisms are responsible for their migration. One of the observable tests for migration theories is the current valueExpand
Exploring the temporal variation of the solar quadrupole moment from relativistic gravitation contributions: A fortuitous circumstance?
Abstract Due to its oblateness, the Sun carries a solar quadrupole moment playing a key role at the crossroad of fundamental solar physics, astrometry and celestial mechanics. There is nowadays aExpand
Global Oscillations of the Sun according to SOHO/LASCO C3 Coronagraph Data
AbstractLong-period oscillations in the brightness of the Sun as a star have been analyzed on the basis of measurements of the solar light reflected by planets when they come into the field of viewExpand
Progress in Global Helioseismology: A New Light on the Solar Modeling Problem and Its Implications for Solar-Like Stars
Since the first observations of solar oscillations, helioseismology has been one of the most successful fields of astrophysics. Data of high quality were obtained through the implementation ofExpand
Asymptotic theory of gravity modes in rotating stars II. Impact of general differential rotation
Context. Differential rotation has a strong influence on stellar internal dynamics and evolution, notably by triggering hydrodynamical instabilities, by interacting with the magnetic field, and moreExpand
Quantification of Sub-Solar Star Ages from the Symmetry of Conjugate Histograms of Spin Period and Angular Velocity
An analytical inverse model that uses histogram data to unequivocally determine the physical law governing how dwarf star spin depends on time (t) and mass (M) is developed, and a new analytical approach of extracting a physical law from conjugate histograms is general and widely applicable. Expand


New insights on the solar core
Since the detection of the asymptotic properties of the dipole gravity modes in the Sun, the quest to find individual gravity modes has continued. An extensive and deeper analysis of 14 years ofExpand
On the Characteristics of the Solar Gravity Mode Frequencies
Gravity modes are the best probes for studying the dynamics of the solar radiative zone, and especially the nuclear core. This paper shows how specific physical processes influence the theoreticalExpand
The quest for the solar g modes
Solar gravity modes (or g modes)—oscillations of the solar interior on which buoyancy acts as the restoring force—have the potential to provide unprecedented inference on the structure and dynamicsExpand
Solar p-Modes Modulated by Interior g-Modes
The process by which frequency modulations of solar p-modes with shorter periods (~5 minutes) occur because of the presence of solar interior g-modes with longer periods (greater than a few hoursExpand
A search for solar g modes in the GOLF data
With over 5 years of GOLF data having some 90% continuity, a new attempt has been made to search for possible solarg modes. Statistical methods are used, based on the minimum of assumptions regardingExpand
Global Oscillations at Low Frequency from the SOHO mission (GOLF)
The GOLF experiment on the SOHO mission aims to study the internal structure of the sun by measuring the spectrum of global oscillations in the frequency range 10−7 to 10−2 Hz. Bothp andg modeExpand
Solar structure from global studies of the 5-minute oscillation
High sensitivity Doppier spectroscopy of integral sunlight in the 769.9 nm line of neutral potassium reveals several equally spaced lines of Q > 1,000 centred on the well known period of 5 min. TheseExpand
Global solar Doppler velocity determination with the GOLF/SoHO instrument
The Global Oscillation at Low Frequencies (GOLF) experiment is a resonant scattering spectrophotometer on board the Solar and Heliospheric Observatory (SoHO) mission, originally designed to measureExpand
Full-disk observations of solar oscillations from the geographic South Pole: Latest results
This paper presents the latest results obtained from the analysis of the full-disk Doppler shift observations obtained at the geographic South Pole in 1981. About 80 normal modes of oscillation (l =Expand
Tracking Solar Gravity Modes: The Dynamics of the Solar Core
Using data from the Global Oscillation at Low Frequency instrument, a periodic structure is detected in agreement with the period separation predicted by the theory for gravity dipole modes in the Sun. Expand