Towards a systematic treatment of observational uncertainties in forward asteroseismic modelling of gravity-mode pulsators

Abstract

Context. In asteroseismology the pulsation mode frequencies of a star are the fundamental data that are compared to theoretical predictions to determine a star's interior physics. Recent significant advances in the numerical, theoretical and statistical asteroseismic methods applied to main sequence stars with convective cores have renewed the interest in investigating the propagation of observational uncertainties within a forward asteroseismic modelling framework. Aims. We aim to quantify the impact of various choices made throughout the observational aspects of extracting pulsation mode frequencies in main sequence stars with gravity modes. Methods. We use a well-studied benchmark slowly pulsating B star, KIC 7760680, to investigate the sensitivity of forward asteroseismic modelling to various sources of observational uncertainty that affect the precision of the input pulsation mode frequencies. Results. We quantify the impact of the propagation of the observational uncertainties involved in forward asteroseismic modelling. We find that one of the largest sources of uncertainty in our benchmark star is in the manual building of period spacing patterns, such that the inclusion of a potentially ambiguous pulsation mode frequency may yield differences in model parameters of up to 10% for mass and age depending on the radial order of the mode. Conclusions. We conclude that future asteroseismic studies of main sequence stars with a convective core should quantify and include observational uncertainties introduced by the light curve extraction, iterative pre-whitening and the building of period spacing patterns, as these propagate into the final modelling results.

arXiv comment21 pages, proposed for acceptance for publication in A&A

References in corpus (65)

• Array Programming with NumPy
• The NumPy array: a structure for efficient numerical computation
• Modules for Experiments in Stellar Astrophysics (MESA)
• The Transiting Exoplanet Survey Satellite
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions
• Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
• The K2 Mission: Characterization and Early results
• Kepler Mission Design, Realized Photometric Performance, and Early Science
• The CoRoT satellite in flight : description and performance
• Overview of the Kepler Science Processing Pipeline
• Asteroseismology of Solar-Type and Red-Giant Stars
• GYRE: An open-source stellar oscillation code based on a new Magnus Multiple Shooting Scheme
• Probing the interior physics of stars through asteroseismology
• Angular Momentum Transport in Stellar Interiors
• Probing the properties of convective cores through g modes: high-order g modes in SPB and gamma Doradus stars
• BRITE-Constellation: nanosatellites for precision photometry of bright stars
• Tight asteroseismic constraints on core overshooting and diffusive mixing in the slowly rotating pulsating B8.3V star KIC 10526294
• Giant star seismology
• Sub-Inertial Gravity Modes in the B8V Star KIC 7760680 Reveal Moderate Core Overshooting and Low Vertical Diffusive Mixing
• Internal mixing of rotating stars inferred from dipole gravity modes
• Low-frequency gravity waves in blue supergiants revealed by high-precision space photometry
• Amplitude modulation in $\delta$ Sct stars: statistics from an ensemble study of Kepler targets
• Signatures of internal rotation discovered in the Kepler data of five slowly pulsating B stars
• A unifying explanation of complex frequency spectra of gamma Dor, SPB and Be stars: combination frequencies and highly non-sinusoidal light curves
• Super-Nyquist asteroseismology with the Kepler Space Telescope
• Evidence for nonlinear resonant mode coupling in the Beta Cep star HD 180642 (V1449 Aql) from CoRoT space-based photometry
• The first view of $\delta$ Scuti and $\gamma$ Doradus stars with the TESS mission
• Gravito-inertial and pressure modes detected in the B3 IV CoRoT target HD 43317
• Variability of OB stars from TESS southern Sectors 1-13 and high-resolution IACOB and OWN spectroscopy
• Variability in the CoRoT photometry of three hot O-type stars. HD 46223, HD 46150 and HD 46966
• A detection threshold in the amplitude spectra calculated from Kepler data obtained during K2 mission
• Forward asteroseismic modeling of stars with a convective core from gravity-mode oscillations: parameter estimation and stellar model selection
• On the Chemical Mixing Induced by Internal Gravity Waves (IGW)
• The mass discrepancy in intermediate- and high-mass eclipsing binaries: the need for higher convective core masses
• Asteroseismic masses, ages, and core properties of $\gamma$ Doradus stars using gravito-inertial dipole modes and spectroscopy
• On the photometric detection of Internal Gravity Waves in upper main-sequence stars I. Methodology and application to CoRoT targets
• Forward seismic modelling of the pulsating magnetic B-type star HD 43317
• Amplitude and frequency variations of oscillation modes in the pulsating DB white dwarf star KIC~08626021: The likely signature of nonlinear resonant mode coupling
• KIC 10526294: a slowly rotating B star with rotationally split, quasi-equally spaced gravity modes
• KIC 3240411 - the hottest known SPB star with the asymptotic g-mode period spacing
• Asteroseismic fingerprints of rotation and mixing in the slowly pulsating B8 V star KIC 7760680
• Detection of a large sample of Gamma Dor stars from Kepler space photometry and high-resolution ground-based spectroscopy
• Rotation of the convective core in $\gamma$ Dor stars measured by dips in period spacings of g modes coupled with inertial modes
• Period spacings of $\gamma$ Doradus pulsators in the Kepler field: detection methods and application to 22 slow rotators
• Kappa-mechanism excitation of retrograde mixed modes in rotating B-type stars
• Deciphering the oscillation spectrum of $\gamma$ Doradus and SPB stars
• First evidence of inertial modes in $\gamma$ Doradus stars: The core rotation revealed
• Constraining stellar evolution theory with asteroseismology of $\gamma$ Doradus stars using deep learning
• Probing the temperature gradient in the core boundary layer of stars with gravito-inertial modes: the case of KIC7760680
• Probing the shape of the mixing profile and of the thermal structure at the convective core boundary through asteroseismology
• Period spacings of gravity modes in rapidly rotating magnetic stars I. Axisymmetric fossil field with poloidal and toroidal components
• Variability of newly identified B-type stars observed by Kepler
• Mode density and frequency extraction in the delta Scuti star HD 50844
• Transport of angular momentum by stochastically excited waves as an explanation for the outburst of the rapidly rotating Be star HD49330
• Period spacings of gravity modes in rapidly rotating magnetic stars II. The case of an oblique dipolar fossil magnetic field
• Detecting axisymmetric magnetic fields using gravity modes in intermediate-mass stars
• Detection of nonlinear resonances among gravity modes of slowly pulsating B stars: results from five iterative prewhitening strategies
• High-precision asteroseismology in Slowly Pulsating B star: HD 50230
• Asteroseismology of massive stars with the TESS mission: the runaway Beta Cep pulsator PHL 346 = HN Aqr
• A homogeneous spectroscopic analysis of a Kepler legacy sample of dwarfs for gravity-mode asteroseismology
• Overstable Convective Modes in Rotating Early Type Stars
• CoRoT high-precision photometry of the B0.5 IV star HD 51756
• Space Photometry with BRITE-Constellation