The Hubble constant from two sibling Type Ia supernovae in the nearby galaxy NGC 4414: SN 1974G and SN 2021J

Gallego-Cano, E.; Izzo, L.; Domínguez-Tagle, Carlos; Prada, Francisco; Pérez, E.; Khetan, N.; Jang, In Sung

doi:10.1051/0004-6361/202243988

Cited by 6 publications

(6 citation statements)

References 49 publications

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“…While understanding the root cause of correlated intrinsic scatter is beyond the scope of this work, our new relative scatter model marginalizes over this correlation, leading to robust uncertainties. Moreover, correlated intrinsic scatter was neglected in the recent siblings-H 0 estimate in Gallego-Cano et al (2022). This subsection thus demonstrates how siblings can be robustly modeled to estimate cosmological parameters.…”

Section: H 0 Constraintsmentioning

confidence: 82%

“…Similarly to Biswas et al (2022), we study the SN Ia color-luminosity relation in a cosmologyindependent fashion, but we constrain a physically motivated common host galaxy dust-law parameter R V . Like Gallego-Cano et al (2022), we use a single siblingʼs calibrator calibrator galaxy to estimate the Hubble constant. Our inference is dominated by the Cepheid distance measurement error; nonetheless, for the first time, we robustly propagate the siblings' combined uncertainty into a cosmological inference by marginalizing over σ Rel .…”

Section: Introductionmentioning

confidence: 99%

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Relative Intrinsic Scatter in Hierarchical Type Ia Supernova Sibling Analyses: Application to SNe 2021hpr, 1997bq, and 2008fv in NGC 3147

Ward,

Thorp,

Mandel

et al. 2023

ApJ

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We present Young Supernova Experiment grizy photometry of SN 2021hpr, the third Type Ia supernova sibling to explode in the Cepheid calibrator galaxy, NGC 3147. Siblings are useful for improving SN-host distance estimates and investigating their contributions toward the SN Ia intrinsic scatter (post-standardization residual scatter in distance estimates). We thus develop a principled Bayesian framework for analyzing SN Ia siblings. At its core is the cosmology-independent relative intrinsic scatter parameter, σ Rel: the dispersion of siblings distance estimates relative to one another within a galaxy. It quantifies the contribution toward the total intrinsic scatter, σ 0, from within-galaxy variations about the siblings’ common properties. It also affects the combined distance uncertainty. We present analytic formulae for computing a σ Rel posterior from individual siblings distances (estimated using any SN model). Applying a newly trained BayeSN model, we fit the light curves of each sibling in NGC 3147 individually, to yield consistent distance estimates. However, the wide σ Rel posterior means σ Rel ≈ σ 0 is not ruled out. We thus combine the distances by marginalizing over σ Rel with an informative prior: σ Rel ∼ U(0, σ 0). Simultaneously fitting the trio’s light curves improves constraints on distance and each sibling’s individual dust parameters, compared to individual fits. Higher correlation also tightens dust parameter constraints. Therefore, σ Rel marginalization yields robust estimates of siblings distances for cosmology, as well as dust parameters for sibling–host correlation studies. Incorporating NGC 3147's Cepheid distance yields H 0 = 78.4 ± 6.5 km s−1 Mpc−1. Our work motivates analyses of homogeneous siblings samples, to constrain σ Rel and its SN-model dependence.

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Section: H 0 Constraintsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Relative Intrinsic Scatter in Hierarchical Type Ia Supernova Sibling Analyses: Application to SNe 2021hpr, 1997bq, and 2008fv in NGC 3147

Ward,

Thorp,

Mandel

et al. 2023

ApJ

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“…Moreover, precise measurements of the Hubble parameter enhance the estimations of the universe's age, size, geometry, structure, evolution, and fate. Additionally, the significance of measuring the Hubble tension extends beyond cosmology, with profound consequences for fundamental physics, impact understandings of gravity and particle physics [6][7][8].…”

Section: Figurementioning

confidence: 99%

“…Cepheid variables and Type Ia Supernovae serve as distance indicators due to their consistent luminosity. By comparing the apparent brightness to their known brightness, distances can be inferred [7]. Then, by connecting the distances to the redshift, the Hubble constant can be calculated.…”

Section: Cepheid Variables and Supernovaementioning

confidence: 99%

Analysis of the Hubble Tension and Modifications to the Standard Cosmological Model

2024

HSET

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The Hubble constant is crucial to the knowledge of the universe’s nature and expansion, remaining as an active area for research in the recent decades. Cosmological microwave background observations revealed a lower value of 67–69 km-1s-1Mpc for the Hubble constant, but local data showed a higher value of 73–75 km-1s-1Mpc. This study focuses on the Hubble constant and its measurement, systematic uncertainties, observed tension, and potential modifications to the standard cosmological model. To be specific, this paper aims to address the tension between different measurement methods, which are Cepheid variables and supernovae, Baryon Acoustic Oscillations, and Gravitational waves, and understand systematic uncertainties. Results show discrepancies in Hubble constant values, indicating potential modifications to the standard cosmological model. Prospects include exploring alternative cosmological components and enhanced detection and computation methods. The study's implications lie in advancing the understanding of the expanding universe and guiding future research directions regarding to Hubble tension measurement.

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“…Therefore, the expected dispersion in their individually estimated distances should be significantly lower than the intrinsic scatter in the Hubble diagram at the same redshift. Thus, SN siblings may also allow us to test distance measurement methods and may support their further improvements (see e.g., Burns et al 2020;Scolnic et al 2020;Gallego-Cano et al 2022;Hoogendam et al 2022;Ward et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Three is the magic number: Distance measurement of NGC 3147 using SN 2021hpr and its siblings

Barna,

Nagy,

Bora

et al. 2023

A&A

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Context. The nearby spiral galaxy NGC 3147 hosted three Type Ia supernovae (SNe Ia) in the past decades that have been the subjects of intense follow-up observations. Simultaneous analysis of their data provides a unique opportunity for testing different methods of light curve fitting and distance estimation. Aims. The detailed optical follow-up of SN 2021hpr allows us to revise the previous distance estimations to NGC 3147 and compare the widely used light curve fitting algorithms to each other. After the combination of the available and newly published data of SN 2021hpr, its physical properties can also be estimated with higher accuracy. Methods. We present and analyse new BV griz and Swift photometry of SN 2021hpr to constrain its general physical properties. Together with its siblings, SNe 1997bq and 2008fv, we cross-compared the individual distance estimates of these three SNe given by the Spectral Adaptive Lightcurve Template (SALT) code, and we also checked their consistency with the results from the Multi-Color Light Curve Shape (MLCS) code. The early spectral series of SN 2021hpr was also fit with the radiative spectral code TARDIS to verify the explosion properties and constrain the chemical distribution of the outer ejecta. Results. After combining the distance estimates for the three SNe, the mean distance to their host galaxy, NGC 3127, is 42.5 ± 1.0 Mpc, which matches with the distance inferred by the most up-to-date light curve fitters, SALT3 and BayeSN. We confirm that SN 2021hpr is a Branch-normal Type Ia SN that ejected ~1.12 ± 0.28 M⊙ from its progenitor white dwarf and synthesized ~0.44 ± 0.14 M⊙ of radioactive 56Ni.

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The Hubble constant from two sibling Type Ia supernovae in the nearby galaxy NGC 4414: SN 1974G and SN 2021J

Cited by 6 publications

References 49 publications

Relative Intrinsic Scatter in Hierarchical Type Ia Supernova Sibling Analyses: Application to SNe 2021hpr, 1997bq, and 2008fv in NGC 3147

Relative Intrinsic Scatter in Hierarchical Type Ia Supernova Sibling Analyses: Application to SNe 2021hpr, 1997bq, and 2008fv in NGC 3147

Analysis of the Hubble Tension and Modifications to the Standard Cosmological Model

Three is the magic number: Distance measurement of NGC 3147 using SN 2021hpr and its siblings

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