Astrometric modeling of unresolved variable binary systems
Auteurs : K. Sivkova, P. Kervella, A. Gallenne, L. Decin, N. Nardetto, F. Arenou, A. Mérand, N. R. Evans, B. Apostolova, M. C. Bailleul, R. S. Rathour, W. Kiviaho, G. Bras, V. Hocdé, L. Breuval, C. Vert, D. P. González
Résumé scientifique
Gaia DR4 will, for the first time, provide epoch astrometry. When analysing these data, binary sources must be treated carefully, as modelling their astrometry as single stars can bias parallax and proper motion estimates. We developed the vimbinary tool, a framework to simulate and interpret epoch astrometry of unresolved binary systems and to evaluate the impact of model assumptions on the resulting astrometric parameters. We simulated Gaia DR4-like epoch astrometry for a sample of 17 well-characterised unresolved binary systems, including both non-pulsating binaries and systems containing one photometric variable component - variability-induced movers (VIMs). We show that both binary motion and the VIM effect can significantly impact parallax and proper motion measurements, with the magnitude of the effect strongly dependent on the orbital period, photocentric amplitude, and flux ratio of the specific system. We also show that larger time coverage does not necessarily improve parallax precision, in contrast to proper motion, for which precision generally improves with longer baselines. Instead, parallaxes retrieved with binary-system fitting are more accurate than those obtained within the single-star framework.
Les articles autour de lui, par date et par proximité
Plus haut, c’est plus proche de cet article ; à gauche, c’est plus ancien. Les traits relient les articles proches entre eux : les groupes de traits sont des sous-thèmes. Sélectionnez un point pour voir pourquoi il est là. Retour au résumé de cet article
Les articles autour de celui-ci
Classés selon la proximité de leur titre et de leur résumé avec ceux de cet article. Sélectionnez-en pour les lire ensemble.
Les articles les plus proches
-
Estimating distances from parallaxes. VI: A method for inferring distances and transverse velocities from parallaxes and proper motions demonstrated on Gaia Data Release 3C. A. L. Bailer-Jones · 2023 · Astrophysics of Galaxies · cité 11 fois · Résumé IA disponible
Estimating distances from parallaxes. VI combine les parallaxes et mouvements propres de Gaia DR3 pour inférer des distances et vitesses transverses, sans modéliser les binaires non résolues.
Résumé scientifique
The accuracy of stellar distances inferred purely from parallaxes degrades rapidly with distance. Proper motion measurements, when combined with some idea of typical velocities, provide independent information on stellar distances. Here I build a direction- and distance-dependent model of the distribution of stellar velocities in the Galaxy, then use this together with parallaxes and proper motions to infer kinegeometric distances and transverse velocities for stars in Gaia DR3. Using noisy simulations I assess the performance of the method and compare its accuracy to purely parallax-based (geometric) distances. Over the whole Gaia catalogue, kinegeometric distances are on average 1.25 times…
-
Accuracy of inference on the physics of binary evolution from gravitational-wave observationsJim W. Barrett, Sebastian M. Gaebel, Coenraad J. Neijssel et al. · 2017 · MNRAS; 477(4): 4685-4695; 2018 · cité 105 fois · Résumé IA disponible
Accuracy of inference on the physics of binary evolution from gravitational-wave observations mesure les contraintes sur l’évolution des binaires à partir des populations de trous noirs détectées par ondes gravitationnelles.
Résumé scientifique
The properties of the population of merging binary black holes encode some of the uncertain physics of the evolution of massive stars in binaries. The binary black hole merger rate and chirp mass distribution are being measured by ground-based gravitational-wave detectors. We consider isolated binary evolution and explore how accurately the physical model can be constrained with such observations by applying the Fisher information matrix to the merging black hole population simulated with the rapid binary population synthesis code COMPAS. We investigate variations in four COMPAS parameters: common envelope efficiency, kick velocity dispersion, and mass loss rates during the luminous blue var…
-
Extracting Astrophysical Information of Highly-Eccentric Binaries in the Millihertz Gravitational Wave BandZeyuan Xuan, Smadar Naoz, Alvin K. Y. Li et al. · 2024 · High Energy Astrophysical Phenomena · cité 1 fois · Résumé IA disponible
Extracting Astrophysical Information of Highly-Eccentric Binaries in the Millihertz Gravitational Wave Band estime les paramètres orbitaux de binaires compactes à partir de signaux d’ondes gravitationnelles, plutôt que de l’astrométrie Gaia.
Résumé scientifique
Wide, highly eccentric ($e>0.9$) compact binaries can naturally arise as progenitors of gravitational wave (GW) mergers. These systems are expected to have a significant population in the mHz band, with their GW signals characterized by ``repeated bursts" emitted upon each pericenter passage. In this study, we show that the detection of mHz GW signals from highly eccentric stellar mass binaries in the local universe can strongly constrain their orbital parameters. Specifically, it can achieve a relative measurement error of $\sim 10^{-6}$ for orbital frequency and $\sim 1\%$ for eccentricity (as $1-e$) in most of the detectable cases. On the other hand, the binary's mass ratio, distance, and…
-
Observing gravitational waves with solar system astrometryGiorgio Mentasti, Carlo R. Contaldi · 2023 · General Relativity and Quantum Cosmology · cité 8 fois · Résumé IA disponible
Observing gravitational waves with solar system astrometry calcule les déflexions astrométriques causées par un fond d’ondes gravitationnelles, et non par le mouvement orbital de binaires.
Résumé scientifique
The subtle influence of gravitational waves on the apparent positioning of celestial bodies offers novel observational windows. We calculate the expected astrometric signal induced by an isotropic Stochastic Gravitational Wave Background (SGWB) in the short distance limit. Our focus is on the resultant proper motion of Solar System objects, a signal on the same time scales addressed by Pulsar Timing Arrays (PTA). We derive the corresponding astrometric deflection patterns, finding that they manifest as distinctive dipole and quadrupole correlations, or in some cases, may not be present. Our analysis encompasses both Einsteinian and non-Einsteinian polarisations. We estimate the upper limits …
-
What are the spectroscopic binaries with high mass functions near the Gaia DR3 main sequence?Kareem El-Badry, Hans-Walter Rix · 2022 · Solar and Stellar Astrophysics · cité 17 fois · Résumé IA disponible
What are the spectroscopic binaries with high mass functions near the Gaia DR3 main sequence? étudie des binaires de Gaia et la nature de leurs compagnons, tandis que cet article examine les biais astrométriques des binaires non résolues.
Résumé scientifique
The 3rd data release of the Gaia mission includes orbital solutions for $> 10^5$ single-lined spectroscopic binaries, representing more than an order of magnitude increase in sample size over all previous studies. This dataset is a treasure trove for searches for quiescent black hole + normal star binaries. We investigate one population of black hole candidate binaries highlighted in the data release: sources near the main sequence in the color-magnitude diagram (CMD) with dynamically-inferred companion masses $M_2$ larger than the CMD-inferred mass of the luminous star. We model light curves, spectral energy distributions, and archival spectra of the 14 such objects in DR3 with high-signifi…
-
Nonparametric analysis of correlations in the binary black hole population with LIGO-Virgo-KAGRA dataJack Heinzel, Matthew Mould, Salvatore Vitale · 2024 · Phys. Rev. D 111, L061305 (2025) · cité 15 fois · Résumé IA disponible
Nonparametric analysis of correlations in the binary black hole population with LIGO-Virgo-KAGRA data décrit les distributions de masses, distances et spins des binaires de trous noirs observées par ondes gravitationnelles.
Résumé scientifique
Formation channels of merging compact binaries imprint themselves on the distributions and correlations of their source parameters. But current understanding of this population observed in gravitational waves is hindered by simplified parametric models. We overcome these limitations using PixelPop [Heinzel et al. (2024)]-our multidimensional Bayesian nonparametric population model. We analyze data from the first three LIGO-Virgo-KAGRA observing runs and make high resolution, minimally modeled measurements of the pairwise distributions of binary black hole masses, redshifts, and spins. There is no evidence that the mass spectrum evolves over redshift and we show that such measurements are fun…
-
Presaging Doppler beaming discoveries of double white dwarfs during the Rubin LSST eraGautham Adamane Pallathadka, Yossef Zenati, Nadia L. Zakamska et al. · 2026 · Solar and Stellar Astrophysics · Résumé IA disponible
Presaging Doppler beaming discoveries of double white dwarfs during the Rubin LSST era simule la détection photométrique de naines blanches doubles, plutôt que les biais astrométriques de Gaia.
Résumé scientifique
Double white dwarfs (DWDs) are by far the most common compact binaries in the Milky Way, are important low-frequency gravitational-wave sources, and in some cases merge to become Type Ia supernovae. So far, no DWD has been identified solely through relativistic Doppler beaming, even though the beaming amplitude directly relates to the radial velocity semi-amplitude. In this work, we initiate a comprehensive binary population synthesis using SeBa and incorporate the resulting binaries into a tripartite Galaxy model. Our proof-of-concept simulations demonstrate that the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) can reliably recover relatively bright ($r \lesssim20~$mag) …
-
Astrometric exoplanet detection with GaiaMichael Perryman, Joel Hartman, Gáspár Bakos et al. · 2014 · Earth and Planetary Astrophysics · cité 209 fois · Résumé IA disponible
Astrometric exoplanet detection with Gaia simule les observations et la loi de balayage de Gaia pour prévoir les détections astrométriques, ici appliquées aux exoplanètes plutôt qu’aux binaires.
Résumé scientifique
We provide a revised assessment of the number of exoplanets that should be discovered by Gaia astrometry, extending previous studies to a broader range of spectral types, distances, and magnitudes. Our assessment is based on a large representative sample of host stars from the TRILEGAL Galaxy population synthesis model, recent estimates of the exoplanet frequency distributions as a function of stellar type, and detailed simulation of the Gaia observations using the updated instrument performance and scanning law. We use two approaches to estimate detectable planetary systems: one based on the S/N of the astrometric signature per field crossing, easily reproducible and allowing comparisons wi…
Aller plus loin
Comment ces articles sont-ils trouvés ?
Nous comparons le titre et le résumé de cet article avec ceux de tous les articles résumés sur ce site, et avec les articles que Semantic Scholar recommande, ceux qu’il cite et ceux qui le citent (pour un article très cité, ses citations les plus récentes et, depuis OpenAlex, les plus citées). Parmi les travaux antérieurs et les suites, les articles qui s’utilisent en profondeur, une méthode qu’il utilise et les suites très citées remontent un peu. Les niveaux (très proche, proche, apparenté) viennent de la similarité des textes, pas d’un jugement de qualité ; * signale un article sans résumé, comparé par son titre. La phrase sous un article est écrite par une IA à partir des deux résumés : vérifiez-la dans les articles. Un article jugé hors sujet par trois lecteurs quitte la liste.
Mis à jour le 13 novembre 2026.