Astrophysics and Space Science最新文献_第3页

Mission analysis for the HENON CubeSat mission to a large Sun-Earth distant retrograde orbit HENON立方体卫星任务的任务分析到一个大的太阳-地球遥远的逆行轨道

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-08-13 DOI: 10.1007/s10509-025-04473-0

Stefano Cicalò, Elisa Maria Alessi, Lorenzo Provinciali, Paride Amabili, Giorgio Saita, Davide Calcagno, Maria Federica Marcucci, Monica Laurenza, Gaetano Zimbardo, Simone Landi, Roger Walker, Michael Khan

{"title":"Mission analysis for the HENON CubeSat mission to a large Sun-Earth distant retrograde orbit","authors":"Stefano Cicalò, Elisa Maria Alessi, Lorenzo Provinciali, Paride Amabili, Giorgio Saita, Davide Calcagno, Maria Federica Marcucci, Monica Laurenza, Gaetano Zimbardo, Simone Landi, Roger Walker, Michael Khan","doi":"10.1007/s10509-025-04473-0","DOIUrl":"10.1007/s10509-025-04473-0","url":null,"abstract":"<div><p>The HEliospheric pioNeer for sOlar and interplanetary threats defeNce (HENON) mission is a CubeSat Space Weather mission, designed to operate in a Sun-Earth Distant Retrograde Orbit (DRO) at more than 10 million km from the Earth. HENON will embark payloads tailored for Space Weather (SWE) observations, i.e., a high-resolution energetic particle radiation monitor, a Faraday cup, and a magnetometer enabling it to provide quasi-real-time monitoring of the interplanetary conditions in deep space. HENON has many important goals, such as demonstrating CubeSat capabilities in deep space, including long-duration electric propulsion with periodic telemetry and command, and robust attitude control for deep-space operations. It will pave the way for a future fleet of spacecraft on DROs, providing continuous near real-time measurements for SWE forecasting. This paper focuses on the mission analysis performed for phase A/B, with the main goal of defining a baseline transfer trajectory to a heliocentric DRO in co-orbital motion with the Earth. The proposed transfer leverages a rideshare opportunity on a mission escaping Earth’s gravity field, most likely one headed toward the Sun–Earth L<sub>2</sub> region, and relies exclusively on on-board electric propulsion to reach deep space, making it a pioneering demonstration of this approach and the technology. Under appropriate assumptions on the electric propulsion system performances, s/c mass and propellant budget, it will be shown that the HENON target DRO can be reached in about 1 year, taking into account also periodic interruptions of thrusting to allow for Telemetry, Tracking and Command.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"370 8","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144832326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gravitational wave distance estimation using intrinsic signal properties: dark sirens as distance indicators 用固有信号特性估计引力波距离：暗警报器作为距离指示器

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-08-12 DOI: 10.1007/s10509-025-04466-z

Trisha V, Rakesh V, Arun Kenath

{"title":"Gravitational wave distance estimation using intrinsic signal properties: dark sirens as distance indicators","authors":"Trisha V, Rakesh V, Arun Kenath","doi":"10.1007/s10509-025-04466-z","DOIUrl":"10.1007/s10509-025-04466-z","url":null,"abstract":"<div><p>Gravitational Waves (GWs) provide a powerful means for cosmological distance estimation, circumventing the systematic uncertainties associated with traditional electromagnetic (EM) indicators. This work presents a model for estimating distances to binary black hole (BBH) mergers using only GW data, independent of EM counterparts or galaxy catalogs. By utilizing the intrinsic properties of the GW signal, specifically the strain amplitude and merger frequency, our model offers a computationally efficient preliminary distance estimation approach that could complements existing Bayesian parameter estimation pipelines. In this work, we examine a simplified analytical expression for the GW luminosity distance derived from General Relativity (GR), based on the leading-order quadrupole approximation. Without incorporating post-Newtonian (PN) or numerical relativity (NR) corrections, or modeling spin, eccentricity, or inclination, we test how closely this expression can reproduce distances reported by full Bayesian inference pipelines. We apply our model to 87 events from the LIGO-Virgo-Kagra (LVK) Gravitational Wave Transient Catalogues (GWTC), computing distances for these sources. Our results demonstrate consistent agreement with GWTC-reported distances, further supported by graphical comparisons that highlight the model’s performance across multiple events.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"370 8","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The 3He((alpha ), (gamma ))7Be reaction in effective field theory 有效场论中的3He((alpha ), (gamma ))7Be反应

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-08-12 DOI: 10.1007/s10509-025-04476-x

Hossein Sadeghi, Maryam Khoddam

{"title":"The 3He((alpha ), (gamma ))7Be reaction in effective field theory","authors":"Hossein Sadeghi, Maryam Khoddam","doi":"10.1007/s10509-025-04476-x","DOIUrl":"10.1007/s10509-025-04476-x","url":null,"abstract":"<div><p>We present a theoretical analysis of the <sup>3</sup>He(<span>(alpha )</span>, <span>(gamma )</span>)<sup>7</sup>Be radiative capture reaction, using pionless effective field theory (EFT) at the leading order. What sets our approach apart is the unique combination of direct capture mechanisms and resonant processes that involve the <span>(7/2^{-})</span> excited state of <sup>7</sup>Be at 429 keV. By rigorously examining electromagnetic multipole transitions, we’ve managed to achieve a theoretical uncertainty of just 4.1% for the astrophysical S-factor. Our calculated value of <span>(S(0) = 0.511 pm 0.021text{ keV}cdot )</span>b aligns impressively with the recommended experimental value of <span>(0.529 pm 0.018text{ keV}cdot )</span>b. At the temperatures found in the solar core (<span>(T_{9} = 0.015)</span>), our reaction rate of <span>((9.2 pm 0.4) times 10^{3}text{ cm}^{3}text{ mol}^{-1}text{ s}^{-1})</span> helps to clear up some long-standing discrepancies in stellar models. Interestingly, our multipole decomposition shows a surprising persistence of M1 contributions (35.2% at resonance) that goes beyond what typical single-particle models would predict, underscoring the significance of two-body currents. The theoretical uncertainties we encountered are mainly due to EFT truncation errors (2.8%) and variations in low-energy constants (2.1%). These findings have direct implications for solar neutrino flux predictions and calculations of primordial lithium abundance.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"370 8","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cosmological dynamics in modified theory of gravitation with a mixture of perfect fluid and dark energy 用完美流体和暗能量混合的修正引力理论中的宇宙动力学

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-08-11 DOI: 10.1007/s10509-025-04474-z

M. R. Ugale, A. O. Dhore

{"title":"Cosmological dynamics in modified theory of gravitation with a mixture of perfect fluid and dark energy","authors":"M. R. Ugale, A. O. Dhore","doi":"10.1007/s10509-025-04474-z","DOIUrl":"10.1007/s10509-025-04474-z","url":null,"abstract":"<div><p>This research investigates cosmic dynamics within the context of <span>(f(mathcal{R},mathcal{L}_{m}))</span> gravity, concentrating on a binary mixing of perfect fluid and dark energy in a Plane Symmetric space-time. By incorporating the non-linear form of <span>(f(mathcal{R},mathcal{L}_{m}))</span> as <span>(f(mathcal{R},mathcal{L}_{m})=frac{mathcal{R}}{2}+mathcal{L}_{m}^{alpha })</span>, it investigates late-time cosmic acceleration and the transition from matter-dominated to dark energy-dominated epochs. The analysis includes the quintessence and Chaplygin gas models, demonstrating their role in the dynamics of energy density, effective pressure, and anisotropy. The model is validated through parameterization using observational data, such as Hubble parameter datasets, which result in an excellent level of agreement with empirical findings. Advanced diagnostics, like the jerk, statefinder, and <span>(Om)</span> diagnostics, show that <span>(f(mathcal{R},mathcal{L}_{m}))</span> gravity is different from previous cosmological models. This lets us explain the expansion of the universe in terms of geometry. This study provides a strong basis for future research on modified gravity, anisotropic cosmological models, and the role of dark energy in the evolution of the universe.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"370 8","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Macroscopic properties of the XTE J1814-338 as a dark matter admixed strange star XTE J1814-338作为暗物质混合的奇异恒星的宏观特性

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-08-08 DOI: 10.1007/s10509-025-04472-1

Luiz L. Lopes

引用次数: 0

Properties of kinetic Alfvén waves (KAWs) in negative-positive ion plasma of Titan’s ionosphere 土卫六电离层正负离子等离子体中动态alfvsamn波（kaw）的性质

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-08-06 DOI: 10.1007/s10509-025-04461-4

Shanza Arooj, Shaukat Ali Shan, Hamid Saleem

{"title":"Properties of kinetic Alfvén waves (KAWs) in negative-positive ion plasma of Titan’s ionosphere","authors":"Shanza Arooj, Shaukat Ali Shan, Hamid Saleem","doi":"10.1007/s10509-025-04461-4","DOIUrl":"10.1007/s10509-025-04461-4","url":null,"abstract":"<div><p>The properties of kinetic Alfvén waves (KAWs) are investigated in the negative positive ion electron (NPIE) plasma of Titan’s ionosphere. The concentrations of positive and negative ions in dayside and nightside regions of this ionosphere are different, whereas the magnitude of the ambient magnetic field also varies. The plasma data indicate the possibility for the existence of very low frequency and long wavelength kinetic Alfvén waves (KAWs) in this environment. The frequencies and wavelengths of these waves are estimated considering only the two kinds of positive <span>(HCNH^{+})</span> and negative <span>(CN^{-})</span> ions, which have dominant concentrations. Extremely small magnetic field <span>(mid B_{0} mid simeq 0.0002)</span> <span>(G)</span> can sustain KAWs with extremely small frequencies of the order of <span>(simeq 0.004text{ rad}/text{s})</span> and very long wavelengths of the order of a thousand kilometres along field lines while the Titan is about a million kilometres away from Saturn’s surface. It is pointed out that the weakly nonlinear KAWs can also give rise to electromagnetic solitary waves similar to the Earth’s upper ionosphere. The formation of solitary structures by the nonlinear KAWs is also investigated using the appropriate normalization of spatial coordinates in parallel and perpendicular directions with respect to the ambient magnetic field. The almost stationary electromagnetic pulses may appear in Titan’s ionosphere moving at very small speeds.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"370 8","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application and implication of knot theory to the circular restricted three-body problem 节理论在圆受限三体问题中的应用及意义

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-08-05 DOI: 10.1007/s10509-025-04469-w

Mason R. Mill, Robert A. Bettinger

引用次数: 0

Probabilistic cosmological inference on HI tomographic data HI层析数据的概率宇宙学推断

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-08-01 DOI: 10.1007/s10509-025-04470-3

Sambatra Andrianomena

{"title":"Probabilistic cosmological inference on HI tomographic data","authors":"Sambatra Andrianomena","doi":"10.1007/s10509-025-04470-3","DOIUrl":"10.1007/s10509-025-04470-3","url":null,"abstract":"<div><p>We explore the possibility of retrieving cosmological information along with its inherent uncertainty from 21-cm tomographic data at intermediate redshift. The first step in our approach consists of training an encoder, composed of several three dimensional convolutional layers, to cast the neutral hydrogen 3D data into a lower dimension latent space. Once pre-trained, the featurizer is able to generate 3D grid representations which, in turn, will be mapped onto cosmology (<span>(Omega _{mathrm{m}})</span>, <span>(sigma _{8})</span>) via likelihood-free inference. For the latter, which is framed as a density estimation problem, we consider a Bayesian approximation method which exploits the capacity of Masked Autoregressive Flow to estimate the posterior. It is found that the representations learned by the deep encoder are separable in latent space. Results show that the neural density estimator, trained on the latent codes, is able to constrain cosmology with a precision of <span>(R^{2} ge 0.91)</span> on all parameters and that most of the ground truth of the instances in the test set fall within <span>(1sigma )</span> uncertainty. It is established that the posterior uncertainty from the density estimator is reasonably calibrated. We also investigate the robustness of the feature extractor by using it to compress out-of-distribution dataset, that is either from a different simulation or from the same simulation but at different redshift. We find that, while trained on the latent codes corresponding to different types of out-of-distribution dataset, the probabilistic model is still reasonably capable of constraining cosmology, with <span>(R^{2} ge 0.80)</span> in general. This highlights both the predictive power of the density estimator considered in this work and the meaningfulness of the latent codes retrieved by the encoder. We believe that the approach prescribed in this proof of concept will be of great use when analyzing 21-cm data from various surveys in the near future.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"370 8","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Complexity in Dst index values over Solar Cycle 24 第24太阳周期Dst指数值的复杂性

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-07-31 DOI: 10.1007/s10509-025-04468-x

Babatunde Rabiu, Ali Kılçık, Ibiyinka Fuwape, Samuel Ogunjo

引用次数: 0

Unlocking gravity and gravitational waves with radio pulsars: advances and challenges 利用射电脉冲星解锁重力和引力波：进展与挑战

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-07-25 DOI: 10.1007/s10509-025-04463-2

Huanchen Hu

{"title":"Unlocking gravity and gravitational waves with radio pulsars: advances and challenges","authors":"Huanchen Hu","doi":"10.1007/s10509-025-04463-2","DOIUrl":"10.1007/s10509-025-04463-2","url":null,"abstract":"<div><p>Pulsars, the cosmic lighthouses, are strongly self-gravitating objects with core densities significantly exceeding nuclear density. Since the discovery of the Hulse–Taylor pulsar 50 years ago, binary pulsar studies have delivered numerous stringent tests of General Relativity (GR) in the strong-field regime as well as its radiative properties—gravitational waves (GWs). These systems also enable high-precision neutron star mass measurements, placing tight constraints on the behaviour of matter at extreme densities. In addition, pulsars act as natural detectors for nanohertz GWs, primarily from supermassive black hole binaries, culminating in the first reported evidence of a stochastic GW background in 2023. In this article, I review key milestones in pulsar research and highlight some of contributions from my own work. After a brief overview of the gravity experiments in §1, I review the discovery of pulsars—particularly those in binaries—and their critical role in gravity experiments (§2) that laid the foundation for recent advances. In §3, I present the latest efforts on GR tests using the Double Pulsar and a pioneer technique to constrain the dense matter equation of state. §4 demonstrates the potential of binary pulsars on testing alternative theories to GR. Advances in nanohertz GW detection with pulsar timing arrays are discussed in §5. I outline some of the current challenges in §6 and conclude with final remarks in §7.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"370 7","pages":""},"PeriodicalIF":1.8,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10509-025-04463-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145168671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0