Inference of the cosmic rest-frame from supernovae Ia

Abstract

We determine the proper motion of the Solar system from the Pantheon sample of supernovae (SNe) of type Ia. The posterior distribution of the Solar system proper velocity, its direction and relevant cosmological parameters are obtained based on the observed distance moduli, heliocentric redshifts, and positions of SNe by means of a Markov Chain Monte Carlo method. We account for the unknown peculiar motion of SNe by including their expected covariance from linear theory. We find that the Solar system moves with $v_o=249\pm 51$ km/s towards $RA=166\pm 16$ deg, $Dec=10\pm 19$ deg (J2000) (all at 68\% C.L.). The direction of motion agrees with the direction of the dipole observed in the cosmic microwave background (CMB) ($RA=166$ deg, $Dec=-7$ deg). The inferred velocity is $2.4\sigma$ smaller than the value inferred from a purely kinematic interpretation of the CMB dipole ($370$ km/s). Assuming a flat $\Lambda$ cold dark matter model, we find no degeneracy of Solar proper motion with other cosmological parameters. The dimensionless matter density is ${\Omega }_M=0.305\pm 0.022$, in excellent agreement with CMB measurements. We also find no degeneracy of the Solar proper motion with the SN calibration nuisance parameter. We conclude that a larger sample of SNe will allow an independent and robust test of the kinematic nature of the CMB dipole.

13 pages, 22 figures

References in corpus (13)

• Array Programming with NumPy
• New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
• The Pantheon+ Analysis: Cosmological Constraints
• The Pantheon+ Analysis: The Full Dataset and Light-Curve Release
• Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves
• Cosmic Distances Calibrated to 1% Precision with Gaia EDR3 Parallaxes and Hubble Space Telescope Photometry of 75 Milky Way Cepheids Confirm Tension with LambdaCDM
• CfA3: 185 Type Ia Supernova Light Curves from the CfA
• Cosmological parameters from the comparison of peculiar velocities with predictions from the 2M++ density field
• The Pantheon+ Analysis: Improving the Redshifts and Peculiar Velocities of Type Ia Supernovae Used in Cosmological Analyses
• The Pantheon+ Analysis: Evaluating Peculiar Velocity Corrections in Cosmological Analyses with Nearby Type Ia Supernovae
• Joining the Hubble Flow: Implications for Expanding Space
• Concerns about the reliability of publicly available SNe Ia data
• The Pantheon+ Analysis: Dependence of Cosmological Constraints on Photometric-Zeropoint Uncertainties of Supernova Surveys

Cited by in corpus (28)

• Seven hints that early-time new physics alone is not sufficient to solve the Hubble tension
• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Is the Observable Universe Consistent with the Cosmological Principle?
• On the evolution of the Hubble constant with the SNe Ia Pantheon Sample and Baryon Acoustic Oscillations: a feasibility study for GRB-cosmology in 2030
• Observational Evidence for Primordial Black Holes: A Positivist Perspective
• Dipole Cosmology: The Copernican Paradigm Beyond FLRW
• The quadrupole in the local Hubble parameter: first constraints using Type Ia supernova data and forecasts for future surveys
• The Cosmic Dipole in the Quaia Sample of Quasars: A Bayesian Analysis
• Discordance of dipole asymmetries seen in recent large radio surveys with the Cosmological Principle
• Testing the isotropy of cosmic acceleration with Pantheon+ and SH0ES: A cosmographic analysis
• Testing cosmic anisotropy with Pade approximation and Pantheon+ sample
• Cosmography of the Local Universe by Multipole Analysis of the Expansion Rate Fluctuation Field
• Consistency of Pantheon+ supernovae with a large-scale isotropic universe
• Tomographic redshift dipole: Testing the cosmological principle
• The kinematic contribution to the cosmic number count dipole
• Testing the Cosmological Principle: On the Time Dilation of Distant Sources
• An Independent Measure of the Kinematic Dipole from SDSS
• Redshift drift in a universe with structure III: Numerical relativity
• No evidence for anisotropy in galaxy spin directions
• Dynamics of Inspiraling Dark Energy
• Combining chirp mass, luminosity distance and sky localisation from gravitational wave events to detect the cosmic dipole
• Anisotropy in the cosmic acceleration inferred from supernovae
• Statistical effects of the observer's peculiar velocity on source number counts
• No evidence for local $H_0$ anisotropy from Tully--Fisher or supernova distances
• A Review on Resolving the Hubble Tension via Late-Universe Physics
• Interferometric view into RT Pav's long secondary period. binary vs oscillatory convective modes
• Numerical evolution of Maxwell's equations for wavefronts propagating through a spherical gravitational potential
• A robust assessment of the local anisotropy of the Hubble constant