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View article: Automated detection of exploding granules with SDO/HMI data
Automated detection of exploding granules with SDO/HMI data Open
Context. Exploding granules on the solar surface play a major role in the dynamics of the outer part of the convection zone, especially in the diffusion of the magnetic field. Aims. We aim to develop an automated procedure able to investig…
View article: Automated detection of exploding granules with SDO/HMI data
Automated detection of exploding granules with SDO/HMI data Open
Exploding granules on the solar surface play a major role in the dynamics of the outer part of the convection zone, especially in the diffusion of the magnetic field. We aim to develop an automated procedure able to investigate the locatio…
View article: Asteroseismic signatures of core magnetism and rotation in hundreds of low-luminosity red giants
Asteroseismic signatures of core magnetism and rotation in hundreds of low-luminosity red giants Open
Red giant stars host solar-like oscillations which have mixed character, being sensitive to conditions both in the outer convection zone and deep within the interior. The properties of these modes are sensitive to both core rotation and ma…
View article: Properties of observable mixed inertial and gravito-inertial modes in <i>γ</i> Doradus stars
Properties of observable mixed inertial and gravito-inertial modes in <i>γ</i> Doradus stars Open
Context. The space missions Kepler and TESS provided a large number of highly detailed time series for main-sequence stars, including γ Doradus stars. Additionally, numerous γ Doradus stars are to be observed in the near future thanks to t…
View article: The PLATO Mission
The PLATO Mission Open
PLATO (PLAnetary Transits and Oscillations of stars) is ESA's M3 mission designed to detect and characterise extrasolar planets and perform asteroseismic monitoring of a large number of stars. PLATO will detect small planets (down to <2 R_…
View article: Asteroseismic measurement of core and envelope rotation rates for 2006 red giant branch stars
Asteroseismic measurement of core and envelope rotation rates for 2006 red giant branch stars Open
Context. Tens of thousands of red giant stars in the Kepler data exhibit solar-like oscillations. The mixed-mode characteristics of their oscillations enable us to study the internal physics from the core to the surface, such as differenti…
View article: Asteroseismic measurement of core and envelope rotation rates for 2006 red giant branch stars
Asteroseismic measurement of core and envelope rotation rates for 2006 red giant branch stars Open
Tens of thousands of red giant stars in the Kepler data exhibit solar-like oscillations. Their oscillations enable us to study the internal physics from core to surface, such as differential rotation. However, envelope rotation rates have …
View article: Predicted asteroseismic detection yield for solar-like oscillating stars with PLATO
Predicted asteroseismic detection yield for solar-like oscillating stars with PLATO Open
We determine the expected yield of detections of solar-like oscillations for the PLATO ESA mission. We used a formulation from the literature to calculate the probability of detection and validated it with Kepler data. We then applied this…
View article: Predicted asteroseismic detection yield for solar-like oscillating stars with PLATO
Predicted asteroseismic detection yield for solar-like oscillating stars with PLATO Open
Aims. In this work, we determine the expected yield of detections of solar-like oscillations for the targets of the foreseen PLATO ESA mission. Our estimates are based on a study of the detection probability, which takes into account the p…
View article: Perturbative analysis of the effect of a magnetic field on gravito-inertial modes
Perturbative analysis of the effect of a magnetic field on gravito-inertial modes Open
Context. Magnetic fields have been measured recently in the cores of red giant stars thanks to their effects on stellar oscillation frequencies. The search for magnetic signatures in pulsating stars, such as γ Doradus ( γ Dor) or slowly pu…
View article: Perturbative analysis of the effect of a magnetic field on gravito-inertial modes
Perturbative analysis of the effect of a magnetic field on gravito-inertial modes Open
Magnetic fields have been measured recently in the core of red giant stars thanks to their effects on stellar oscillation frequencies. The search for magnetic signatures in pulsating stars, such as $γ$ Doradus or Slowly Pulsation B stars, …
View article: Internal magnetic fields in 13 red giants detected by asteroseismology
Internal magnetic fields in 13 red giants detected by asteroseismology Open
Context. Magnetic fields affect stars at all evolutionary stages. While surface fields have been measured for stars across the Hertzsprung–Russell (HR) diagram, internal magnetic fields remain largely unknown. The recent seismic detection …
View article: Internal magnetic fields in 13 red giants detected by asteroseismology
Internal magnetic fields in 13 red giants detected by asteroseismology Open
While surface fields have been measured for stars across the HR diagram, internal magnetic fields remain largely unknown. The recent seismic detection of magnetic fields in the cores of several Kepler red giants has opened a new avenue to …
View article: Strong magnetic fields detected in the cores of 11 red giant stars using gravity-mode period spacings
Strong magnetic fields detected in the cores of 11 red giant stars using gravity-mode period spacings Open
Despite their importance in stellar evolution, little is known about magnetic fields in the interior of stars. The recent seismic detection of magnetic fields in the core of several red giant stars has given measurements of their strength …
View article: Texture of average solar photospheric flows and the donut-like pattern
Texture of average solar photospheric flows and the donut-like pattern Open
Detailed knowledge of surface dynamics is one of the key points in understanding magnetic solar activity. The motions of the solar surface, to which we have direct access via the observations, tell us about the interaction between the emer…
View article: Texture of average solar photospheric flows and the donut-like pattern
Texture of average solar photospheric flows and the donut-like pattern Open
Context. Detailed knowledge of surface dynamics is one of the key points in understanding magnetic solar activity. The motions of the solar surface, to which we have direct access via the observations, tell us about the interaction between…
View article: Strong magnetic fields detected in the cores of 11 red giant stars using gravity-mode period spacings
Strong magnetic fields detected in the cores of 11 red giant stars using gravity-mode period spacings Open
Despite their importance in stellar evolution, little is known about magnetic fields in the interior of stars. The recent seismic detection of magnetic fields in the core of several red giant stars has given measurements of their strength …
View article: 30 to 100-kG magnetic fields in the cores of red giant stars
30 to 100-kG magnetic fields in the cores of red giant stars Open
A red giant star is an evolved low- or intermediate-mass star that has exhausted its central hydrogen content, leaving a helium core and a hydrogen-burning shell. Oscillations of stars can be observed as periodic dimmings and brightenings …
View article: Deciphering stellar chorus: apollinaire, a Python 3 module for Bayesian peakbagging in helioseismology and asteroseismology
Deciphering stellar chorus: apollinaire, a Python 3 module for Bayesian peakbagging in helioseismology and asteroseismology Open
Since the asteroseismic revolution, the availability of efficient and reliable methods to extract stellar-oscillation mode parameters has been an important part of modern stellar physics. In the fields of helio- and asteroseismology, these…
View article: Density power spectrum of three red giant stars observed by Kepler
Density power spectrum of three red giant stars observed by Kepler Open
Density power spectrum of three red giants stars observed by Kepler in the frequency range 50-280 µHz. Kepler data are publicly available from the Mikulski Archive for Space Telescopes (MAST) portal at https://archive.stsci.edu. They have …
View article: Density power spectrum of three red giant stars observed by Kepler
Density power spectrum of three red giant stars observed by Kepler Open
Density power spectrum of three red giants stars observed by Kepler in the frequency range 50-280 µHz. Kepler data are publicly available from the Mikulski Archive for Space Telescopes (MAST) portal at https://archive.stsci.edu. They have …
View article: Seismic signature of electron degeneracy in the core of red giants: Hints for mass transfer between close red-giant companions
Seismic signature of electron degeneracy in the core of red giants: Hints for mass transfer between close red-giant companions Open
The detection of mixed modes in red giants with space missions C O R O T and Kepler has revealed their deep internal structure. These modes allow us to characterize the pattern of pressure modes (through the measurement of their asymptotic…
View article: Probing core overshooting using subgiant asteroseismology: The case of KIC10273246 (<i>Corrigendum</i>)
Probing core overshooting using subgiant asteroseismology: The case of KIC10273246 (<i>Corrigendum</i>) Open
International audience
View article: Probing core overshooting using subgiant asteroseismology: The case of KIC10273246
Probing core overshooting using subgiant asteroseismology: The case of KIC10273246 Open
\nContext. The size of convective cores remains uncertain, despite their substantial influence on stellar evolution, and thus on stellar ages. The seismic modeling of young subgiants can be used to obtain indirect constraints on the core s…
View article: Photospheric downflows observed with SDO/HMI, HINODE, and an MHD simulation
Photospheric downflows observed with SDO/HMI, HINODE, and an MHD simulation Open
Downflows on the solar surface are suspected to play a major role in the dynamics of the convection zone, at least in its outer part. We investigate the existence of the long-lasting downflows whose effects influence the interior of the Su…
View article: Inferring the internal structure of <i>γ</i> Doradus variables from Rossby modes
Inferring the internal structure of <i>γ</i> Doradus variables from Rossby modes Open
A unique type of oscillation modes has recently been identified in γ Doradus variables. These low-frequency modes are called Rossby modes (or r modes) because they consist of Rossby waves in each spherical layer. These waves are characteri…