Astrophysics and Space Science最新文献

Resolved spectroscopic binaries: orbital elements and parallaxes

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2025-01-08 DOI: 10.1007/s10509-024-04393-5

Dugasa Belay Zeleke, Arseniy M. Sachkov, Oleg Y. Malkov, Seblu Humne Negu, Solomon Belay Tessema, Alyona D. Grinenko

引用次数: 0

Title: proton acceleration by kinetic turbulence across various magnetization levels in astrophysical plasmas

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2024-12-20 DOI: 10.1007/s10509-024-04391-7

Ji-Hoon Ha

{"title":"Title: proton acceleration by kinetic turbulence across various magnetization levels in astrophysical plasmas","authors":"Ji-Hoon Ha","doi":"10.1007/s10509-024-04391-7","DOIUrl":"10.1007/s10509-024-04391-7","url":null,"abstract":"<div><p>Turbulence in astrophysical plasma transfers energy to kinetic scales, leading to proton acceleration or heating, yet the formation of suprathermal protons from such turbulence is not fully understood. While proton acceleration modeling based on the Fokker-Planck equation with diffusion through kinetic Alfvén waves (KAW) has been proposed to understand in-situ measurements of suprathermal protons in the interplanetary medium, more investigations using such modeling could help clarify the nature of particle acceleration in various astrophysical media beyond the interplanetary medium. Since the characteristics of KAW turbulence depend on the magnetization of the plasma system and the temperature anisotropy of the proton distribution function, proton acceleration mediated by KAW turbulence could also be influenced by these factors. By solving the Fokker-Planck equation, this study examines proton acceleration through KAW turbulence across strongly to weakly magnetized astrophysical plasmas, parameterized by plasma beta (<span>(beta =0.01-10)</span>), and the effects of proton temperature anisotropy. Particularly, our findings indicate that KAW turbulence significantly influences the presence of suprathermal protons in low-beta plasmas, such as the interplanetary medium, but is less impactful in high-beta environments, like the intergalactic and intracluster medium. Additionally, the proton temperature anisotropy significantly modulates the efficiency of proton diffusion in velocity space in low-beta environments.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"369 12","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859463","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

Recycled pulsars - a historical perspective 回收脉冲星--历史视角

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2024-12-17 DOI: 10.1007/s10509-024-04389-1

G. Srinivasan

引用次数: 0

Perturbation effect of solar radiation pressure on the Sun-Earth co-orbital motion 太阳辐射压力对日地同轨道运动的扰动效应

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2024-12-16 DOI: 10.1007/s10509-024-04387-3

Mingxu Zhao, Yi Qi, Dong Qiao

引用次数: 0

Calculating the quasi-periodic distant retrograde orbit under the ephemeris model based on the adaptive two-level differential correction 基于自适应两级差分校正的星历模型下的准周期远距离逆行轨道计算

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2024-12-16 DOI: 10.1007/s10509-024-04390-8

Yujie Chen, Yanwei Zhu, Meichen Chan, Chenyuan Qiao, Haipeng Qiu

{"title":"Calculating the quasi-periodic distant retrograde orbit under the ephemeris model based on the adaptive two-level differential correction","authors":"Yujie Chen, Yanwei Zhu, Meichen Chan, Chenyuan Qiao, Haipeng Qiu","doi":"10.1007/s10509-024-04390-8","DOIUrl":"10.1007/s10509-024-04390-8","url":null,"abstract":"<div><p>Research on the dynamics of multi-body motion in the Earth-Moon space is a crucial area in current spacecraft motion studies. Distant Retrograde Orbits (DROs) are highly valuable trajectories in the Earth-Moon space. Under the ephemeris model, DROs will become quasi-periodic. Efficiently computing quasi-periodic DROs in the ephemeris model is a pressing issue. This paper addresses the problems of high computational time cost and significant divergence over multiple orbit cycles when calculating quasi-periodic DROs under the ephemeris model and proposes an adaptive two-level differential correction algorithm based on differential evolution. The traditional two-level differential correction selects patch points at equal intervals, while the DRO states are different with different amplitudes, choosing patch points at equal intervals is simple but not suitable for most DRO. Each quasi-periodic DRO should have its own patch points position. The adaptive two-level differential correction algorithm firstly uses differential evolution to obtain the optimal solution of the position of the patch points and then two-level differential correction is played. This algorithm significantly improving both computational efficiency and orbital convergence. Simulation results show that this algorithm significantly reduces computational costs and achieves better convergence compared to traditional two-level differential correction algorithm. This study has a reference value for the design of long-term quasi-periodic DRO, and provides a new idea for the selection strategy of patch points in the two-level differential correction algorithm and the multiple shooting algorithm.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"369 12","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826297","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

On the formation of super-Jupiters: core accretion or gravitational instability?

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2024-12-12 DOI: 10.1007/s10509-024-04388-2

Max Nguyen, Vardan Adibekyan

{"title":"On the formation of super-Jupiters: core accretion or gravitational instability?","authors":"Max Nguyen, Vardan Adibekyan","doi":"10.1007/s10509-024-04388-2","DOIUrl":"10.1007/s10509-024-04388-2","url":null,"abstract":"<div><p>The Core Accretion model is widely accepted as the primary mechanism for forming planets up to a few Jupiter masses. However, the formation of super-massive planets remains a subject of debate, as their formation via the Core Accretion model requires super-solar metallicities. Assuming stellar atmospheric abundances reflect the composition of protoplanetary disks, and that disk mass scales linearly with stellar mass, we calculated the total amount of metals in planet-building materials that could contribute to the formation of massive planets. In this work, we studied a sample of 172 Jupiter-mass planets and 93 planets with masses exceeding 4 <span>(M_{jupiter})</span>. Our results consistently demonstrate that planets with masses above 4 <span>(M_{jupiter})</span> form in disks with at least as much metal content as those hosting planets with masses between 1 and 4 <span>(M_{jupiter})</span>, often with slightly higher metallicity, typically exceeding that of the proto-solar disk. We interpret this as strong evidence that the formation of very massive Jupiters is feasible through Core Accretion and encourage planet formation modelers to test our observational conclusions.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"369 12","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10509-024-04388-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142811241","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

Accelerating cosmological (f(R,L_{m},T)) gravity model along with bulk viscous fluid

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2024-12-06 DOI: 10.1007/s10509-024-04386-4

Shivani Sharma, Pratik V. Lepse, Mehul Raj Sharma

引用次数: 0

Micro-Raman and FTIR spectroscopic characterization of the first Turkish lunar regolith simulant

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2024-12-06 DOI: 10.1007/s10509-024-04383-7

Ozan Unsalan, Y. Cengiz Toklu, Cisem Altunayar-Unsalan, Nurcan Calis Acikbas, Gokhan Acikbas, Ali Erdem Cercevik

{"title":"Micro-Raman and FTIR spectroscopic characterization of the first Turkish lunar regolith simulant","authors":"Ozan Unsalan, Y. Cengiz Toklu, Cisem Altunayar-Unsalan, Nurcan Calis Acikbas, Gokhan Acikbas, Ali Erdem Cercevik","doi":"10.1007/s10509-024-04383-7","DOIUrl":"10.1007/s10509-024-04383-7","url":null,"abstract":"<div><p>In this work, Infrared and Raman spectroscopic investigations on a new Turkish lunar regolith simulant (TBG-1), Chinese (own product), and Japanese simulants are presented for the first time. Our Raman spectroscopic investigation on TBG-1 simulant implies that it is mainly forsteritic olivine. Moreover, the Chinese sample produced by our group in Türkiye showed carbonate peaks at 712 cm<sup>−1</sup> and 878 cm<sup>−1</sup> in the IR spectra, which were attributed as calcium or sodium carbonates which could be a result of terrestrial weathering. Here, we propose that TBG-1 is close to the composition of lunar highland impact glass in terms of its (Mg, Ca)/Al<sub>2</sub>O<sub>3</sub> ratios. Our effort suggested that our recently produced Turkish simulant is similar to the Apollo 11 lunar soil sample in terms of its Al<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> composition. Some of the samples we collected to simulate lunar regolith also show similarities to the Apollo 14 samples and JSC-1A simulant produced by NASA.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"369 12","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142789299","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

Determination of the porosity of Didim H3-5 meteorite using pycnometry and three-dimensional laser scanning

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2024-12-03 DOI: 10.1007/s10509-024-04384-6

Cisem Altunayar-Unsalan, Ozan Unsalan

{"title":"Determination of the porosity of Didim H3-5 meteorite using pycnometry and three-dimensional laser scanning","authors":"Cisem Altunayar-Unsalan, Ozan Unsalan","doi":"10.1007/s10509-024-04384-6","DOIUrl":"10.1007/s10509-024-04384-6","url":null,"abstract":"<div><p>This study focuses on the porosity of the Didim H3−5 chondrite, providing insights into its physical and structural properties. Using the 3D laser scanning, we determined, that the bulk volume and the bulk density of Didim are 17.15 cm<sup>3</sup> and 3.16 g/cm<sup>3</sup>, respectively. Through helium pycnometry, we found thatthe grain volume and the grain density of Didim chondrite are 1.41 cm<sup>3</sup> and 3.64±0.001 g/cm<sup>3</sup>. We calculated that Didim has a porosity of 13.28±0.024%, which is consistent with similar chondrites, such as Fermo, but higher than Acfer 166 and Oum Dreyga. To establish robust links between meteorites and their possible parent bodies, further systematic and multi-analytical efforts, such as those used in this study, are requiredto accurately characterize meteorites’ porosities. Among the primary minerals in H3−5 chondrites, iron-nickel metals and iron-sulfides are also distributed heterogeneously in these ordinary chondrites. Using a combined approach of pycnometry and 3D laser scanning, we can further interpret shock processes from impacts on the parent body and weathering on Earth can be further interpreted in terms of their geologic history and the environmental conditions experienced by these chondrites both in parent bodies and after landing on Earth.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"369 12","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142761926","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

“Entangled” pairs of stars disrupted by the tidal action of Super Massive Black Hole 被超大质量黑洞潮汐作用扰乱的 "纠缠 "恒星对

IF 1.8 4区物理与天体物理

Astrophysics and Space Science Pub Date : 2024-11-28 DOI: 10.1007/s10509-024-04381-9

Galina N. Dryomova, Vladimir V. Dryomov, Alexander V. Tutukov

{"title":"“Entangled” pairs of stars disrupted by the tidal action of Super Massive Black Hole","authors":"Galina N. Dryomova, Vladimir V. Dryomov, Alexander V. Tutukov","doi":"10.1007/s10509-024-04381-9","DOIUrl":"10.1007/s10509-024-04381-9","url":null,"abstract":"<div><p>Based on modern observations on central S-stars by Gillessen et al. and hypervelocity stars (HVS) by Brown et al. the question is raised whether it is possible to establish the genetic duality of these stars? Could they belong in the past to a common parent binary star until it was captured and then gravitationally ruptured by a supermassive black hole (SMBH) within the Hills scenario? A cross-analysis of these observational data is carried out to obtain reliable evidence for the possible quantitative relationship of the stars under consideration. Three key issues are considered: 1. reconstruction of the trajectory of HVS ejection from the SMBH neighborhood by the method of backward integration in the Galaxy potential; 2. estimation of the dynamical stability of the S-star orbits by the <span>(N)</span>-body method — direct integration of their motion in the central field of the SMBH, taking into account the perturbing potential created by the S-cloud members; 3. checking of the coplanarity of orbits of a central S-star and an HVS; For nine HVSs it is possible to reconstruct the central trajectory of the ejection (at a distance less than a parsec from the SMBH) within the uncertainty of the observational proper motion values. For S2 star the timescale of the dynamical stability of its spatial orbital configuration in the S-cloud is evaluated as ∼ 100,000 years. This requires an additional comment on the criterion of the coplanarity of the orbits of paired S-HVS. The problem of identifying tidally decoupled components (S-HVS pairs) by the SMBH field poses a challenge to modern astrometric observations, and not only. This problem may provide an independent test of our knowledge of the distribution of baryon and dark matter, as well as the Galactic gravitational potential constructed on their basis, which is important in cosmological and evolutionary interpretations.</p></div>","PeriodicalId":8644,"journal":{"name":"Astrophysics and Space Science","volume":"369 11","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142736861","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