New Astronomy最新文献

{"title":"Modifications of SPH towards three-dimensional simulations of an icy moon with internal ocean","authors":"Keiya Murashima ,&nbsp;Natsuki Hosono ,&nbsp;Takayuki R. Saitoh ,&nbsp;Takanori Sasaki","doi":"10.1016/j.newast.2024.102320","DOIUrl":"10.1016/j.newast.2024.102320","url":null,"abstract":"<div><div>There are some traces of the existence of internal ocean in some icy moons, such as the vapor plumes of Europa and Enceladus. This implies a region of liquid water beneath the surface ice shell. Since liquid water would be essential for the origin of life, it is important to understand the development of these internal oceans, particularly their temperature distribution and evolution. The balance between tidal heating and radiative cooling is believed to sustain liquid water beneath an icy moon’s surface. We aim to simulate the tidal heating of an internal ocean in an icy moon using 3-dimensional numerical fluid calculations with the Smoothed Particle Hydrodynamics (SPH) method. We incorporated viscosity and thermal conduction terms into the governing equations of SPH. However, we encountered two issues while calculating rigid body rotation using SPH with a viscous term: (1) conventional viscosity formulations generated unphysical forces that hindered rotation, and (2) there was artificial internal energy partitioning within the layered structure, which was due to the standard SPH formulations. To address the first issue, we modified the viscosity formulation. For the second, we adopted Density Independent SPH (DISPH) developed in previous studies to improve behavior at discontinuous surfaces. Additionally, we implemented radiative cooling using an algorithm to define fluid surfaces via the particle method. We also introduced an equation of state accounting for phase transitions. With these modifications, we have refined the SPH method to encompass all necessary physical processes for simulating the evolution of icy moons with internal oceans.</div></div>","PeriodicalId":54727,"journal":{"name":"New Astronomy","volume":"115 ","pages":"Article 102320"},"PeriodicalIF":1.9,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654161","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}

{"title":"Photometric study for the short period contact binary V724 And","authors":"Bin Zhang ,&nbsp;Yi-Dan Gao ,&nbsp;Zhen Zhong ,&nbsp;Bing Lv","doi":"10.1016/j.newast.2024.102318","DOIUrl":"10.1016/j.newast.2024.102318","url":null,"abstract":"<div><div>We present the new light curve synthesis and orbital period change analysis of V724 And. We found that it is a W-subtype contact binary system with a mass ratio of q = 2.31 and a fill-out factor of f = 10.8%. The weak O’Connell effect can be explained by a cool star-spot on the more massive component star. By analyzing orbital period changes, it is found that the target displays a secular period decrease superimposed on a cyclic oscillation. The orbital period decreases at a rate of dp/dt = −4.13 × 10⁻⁸ d yr⁻¹, which can be explained by the mass transfer from the more massive one to the less massive component. The new discovery suggests that the semi-amplitude and period of the cyclic variation are A = 0.0013 d and P = 10.54 yr, respectively, which implies that V724 And is a possibly triple system. The minimum mass of the tertiary companion is estimated as M<span><math><msub><mrow></mrow><mrow><mn>3</mn><mi>m</mi><mi>i</mi><mi>n</mi></mrow></msub></math></span> = 0.054 M<span><math><msub><mrow></mrow><mrow><mo>⊙</mo></mrow></msub></math></span>, which plays an important role during the formation and evolution of the central binary system.</div></div>","PeriodicalId":54727,"journal":{"name":"New Astronomy","volume":"115 ","pages":"Article 102318"},"PeriodicalIF":1.9,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593906","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}

{"title":"TESS and AAVSO observations of the eclipsing Z Cam-type cataclysmic variable V416 Dra","authors":"Hongfei Yang,&nbsp;Zhongtao Han,&nbsp;Weiwei Na,&nbsp;Hushan Xu,&nbsp;Tingting Yang","doi":"10.1016/j.newast.2024.102319","DOIUrl":"10.1016/j.newast.2024.102319","url":null,"abstract":"<div><div>We present a photometric analysis of the eclipsing Z Cam-type dwarf nova V416 Dra based on TESS and AAVSO data. The AAVSO light curve, spanning nearly 17 years, shows numerous outbursts recurring approximately every 20.2 and 38.6 days. We examined the amplitude vs. recurrence-time relation in V416 Dra, which appears to reflect the common characteristics of long outbursts in Z Cam stars. The TESS light curves revealed that V416 Dra is a shallow eclipse binary and shows some SU UMa-like superoutbursts, which may be related to the special structure of the accretion disk. The period-searching results show that there are the forest of peaks within the period range of 0.4–2.5 days, related to donor star’s activity. Moreover, we also find the presence of some typical quasi-periodic oscillation (QPO) signals with periods of 14–41 and 177–200 min, respectively. These results will help us locate the origin of the QPOs in V416 Dra accurately.</div></div>","PeriodicalId":54727,"journal":{"name":"New Astronomy","volume":"115 ","pages":"Article 102319"},"PeriodicalIF":1.9,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586112","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}

{"title":"Predicting the Physical Properties of Dark Matter Subhalos from Baryonic Parameters Using Machine Learning","authors":"Moonzarin Reza","doi":"10.1016/j.newast.2024.102316","DOIUrl":"10.1016/j.newast.2024.102316","url":null,"abstract":"<div><div>Dark matter subhalos play an important role in galaxy formation and evolution. However, accurate prediction of dark matter properties remains a challenge of modern-day astronomy. In recent times, machine learning (ML) tools have shown promising results in solving numerous astrophysical problems. In this paper, we use data from the EAGLE simulations to determine the total mass and the half-mass radius of dark matter subhalos using structural properties of gas, star, black hole, and photometric features using gradient boosted decision trees (GBDT) and dense neural network. GBDT does not require data preprocessing, and results in better performance compared to the neural network. According to GBDT, the most important feature for subhalo radius and mass estimation is gas radius and black hole mass respectively. The all-features combined approach results in the highest test accuracy — Pearson’s correlation coefficient = 0.947 and 0.981, coefficient of determination = 0.898 and 0.962, normalized median absolute deviation = 0.111 and 0.114 for radius and mass respectively. We evaluate our model for masses and redshifts beyond its training range and find that GBDT demonstrates significantly better extrapolation capabilities than the neural network. We also test our model on simulations with different resolutions, and find that the discrepancies lie within 10% if the resolution is changed. This novel study incorporates the structural parameters of gas and black hole to determine the dark matter properties using a ML-based approach. The promising results of this study prove that ML tools can improve our current understanding of dark matter, and answer some of the basic cosmological questions.</div></div>","PeriodicalId":54727,"journal":{"name":"New Astronomy","volume":"115 ","pages":"Article 102316"},"PeriodicalIF":1.9,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142527652","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}

{"title":"Slowly rotating charged Bardeen stellar structure","authors":"Adnan Malik ,&nbsp;Zoya Asghar ,&nbsp;M. Farasat Shamir ,&nbsp;Fatemah Mofarreh","doi":"10.1016/j.newast.2024.102314","DOIUrl":"10.1016/j.newast.2024.102314","url":null,"abstract":"<div><div>This paper is devoted to investigating the dynamics of charged stellar structures with Bardeen exterior geometry. For this purpose, firstly a proposed metric coefficient is utilized, which is defined as <span><math><mrow><mi>a</mi><mo>=</mo><mi>N</mi><msup><mrow><mfenced><mrow><mn>1</mn><mo>+</mo><mn>2</mn><mi>h</mi><msup><mrow><mi>r</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></mfenced></mrow><mrow><mi>m</mi><mo>/</mo><mn>2</mn></mrow></msup></mrow></math></span>. Here, <span><math><mi>h</mi></math></span> and <span><math><mi>N</mi></math></span> are arbitrary constants determined from matching conditions and <span><math><mi>m</mi></math></span> is a positive integer. The pressure and density profiles are found to be positive and monotonically decreasing, with maximum values occurring at the center. Furthermore, the energy conditions and causality conditions are satisfied, and the adiabatic index falls within an acceptable range. The second part of the paper focuses on the dynamics of rotating stars. Numerical values for relevant parameters are assumed to obtain the masses and radii of stars within the desired range. Five different compact stars, namely, <span><math><mrow><mi>V</mi><mi>e</mi><mi>l</mi><mi>a</mi><mi>X</mi><mo>−</mo><mn>1</mn></mrow></math></span>, <span><math><mrow><mi>C</mi><mi>e</mi><mi>n</mi><mi>X</mi><mo>−</mo><mn>3</mn></mrow></math></span>, <span><math><mrow><mn>4</mn><mi>U</mi><mn>1820</mn><mo>−</mo><mn>30</mn></mrow></math></span>, <span><math><mrow><mn>4</mn><mi>U</mi><mn>1608</mn><mo>−</mo><mn>52</mn></mrow></math></span>, and <span><math><mrow><mi>P</mi><mi>S</mi><mi>R</mi><mn>1903</mn><mo>+</mo><mn>327</mn></mrow></math></span>, are considered. The behavior of the moment of inertia of the sphere against the solar mass is investigated, revealing an increase in the moment of inertia with an increase in solar mass. Furthermore, the relationships of mass and energy density against the radius of the compact structure exhibit natural behavior, supporting the acceptability of the analysis. Overall, the study supports the existence of realistic charged compact structures with Bardeen exterior geometry.</div></div>","PeriodicalId":54727,"journal":{"name":"New Astronomy","volume":"114 ","pages":"Article 102314"},"PeriodicalIF":1.9,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418764","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}

{"title":"Composition tracking for collisions between differentiated bodies in REBOUND","authors":"Noah Ferich ,&nbsp;Anna C. Childs ,&nbsp;Jason H. Steffen","doi":"10.1016/j.newast.2024.102315","DOIUrl":"10.1016/j.newast.2024.102315","url":null,"abstract":"<div><div>Previous research suggests that impacts between planetary embryos and planetesimals during the late stages of planet formation can often determine the percentages of core and mantle material that compose the newly formed planets in a system. Previous studies have attempted to include the composition-changing effects of these collisions in N-body simulations of planet formation, often as post-processing codes. In this paper, we present the Differentiated Body Composition Tracker, a new post-processing tool that uses collisional data collected from the N-body integrator REBOUND to determine the amount of core and mantle material that is transferred between colliding objects and the resulting fragments during an impact. We demonstrate how this code works using the data from 50 REBOUND simulations of planet formation and explore how the parameters in the code affect the core mass fractions of the remaining objects from these simulations. We then investigate how non-uniform distributions of core material across an initial disc affect the final core mass fractions of planets. Under ideal conditions, we find that a combination of giant impacts and planetary embryos enriched in core material could create some of the iron-rich planets that have been discovered.</div></div>","PeriodicalId":54727,"journal":{"name":"New Astronomy","volume":"114 ","pages":"Article 102315"},"PeriodicalIF":1.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418252","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}

{"title":"NcorpiON : A O(N) software for N-body integration in collisional and fragmenting systems","authors":"Jérémy Couturier,&nbsp;Alice C. Quillen,&nbsp;Miki Nakajima","doi":"10.1016/j.newast.2024.102313","DOIUrl":"10.1016/j.newast.2024.102313","url":null,"abstract":"<div><div>Ncorpi<span><math><mi>O</mi></math></span>N is a general purpose N-body software initially developed for the time-efficient integration of collisional and fragmenting systems of planetesimals or moonlets orbiting a central mass. It features a fragmentation model, based on crater scaling and ejecta models, able to realistically simulate a violent impact.</div><div>The user of Ncorpi<span><math><mi>O</mi></math></span>N can choose between four different built-in modules to compute self-gravity and detect collisions. One of these makes use of a mesh-based algorithm to treat mutual interactions in <span><math><mrow><mi>O</mi><mrow><mo>(</mo><mi>N</mi><mo>)</mo></mrow></mrow></math></span> time. Another module, much more efficient than the standard Barnes–Hut tree code, is a <span><math><mrow><mi>O</mi><mrow><mo>(</mo><mi>N</mi><mo>)</mo></mrow></mrow></math></span> tree-based algorithm called FalcON. It relies on fast multipole expansion for gravity computation and we adapted it to collision detection as well. Computational time is reduced by building the tree structure using a three-dimensional Hilbert curve. For the same precision in mutual gravity computation, Ncorpi<span><math><mi>O</mi></math></span>N is found to be up to 25 times faster than the famous software REBOUND.</div><div>Ncorpi<span><math><mi>O</mi></math></span>N is written entirely in the C language and only needs a C compiler to run. A python add-on, that requires only basic python libraries, produces animations of the simulations from the output files. Ncorpi<span><math><mi>O</mi></math></span>N can communicate with REBOUND’s webGL viewer via MPI for 3D visualization. The name Ncorpi<span><math><mi>O</mi></math></span>N, reminding of a scorpion, comes from the French <em>N-corps</em>, meaning N-body, and from the mathematical notation <span><math><mrow><mi>O</mi><mrow><mo>(</mo><mi>N</mi><mo>)</mo></mrow></mrow></math></span>, due to the running time of the software being almost linear in the total number <span><math><mi>N</mi></math></span> of bodies. Ncorpi<span><math><mi>O</mi></math></span>N detects collisions and computes mutual gravity faster than REBOUND, and unlike other N-body integrators, it can resolve a collision by fragmentation. The fast multipole expansions are implemented up to order eight to allow for a high precision in mutual gravity computation.</div></div>","PeriodicalId":54727,"journal":{"name":"New Astronomy","volume":"114 ","pages":"Article 102313"},"PeriodicalIF":1.9,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418759","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}

{"title":"Study of solar activities associated with a Halo CME on 17 Feb 2023 event","authors":"A Ansar Ahamed ,&nbsp;S Prasanna Subramanian ,&nbsp;A Mujiber Rahman ,&nbsp;A Kubera Raja ,&nbsp;K Mahalakshmi ,&nbsp;TK Thirumalaisamy","doi":"10.1016/j.newast.2024.102312","DOIUrl":"10.1016/j.newast.2024.102312","url":null,"abstract":"<div><div>In the present work, propagation of an earth directed fast and wide Coronal Mass Ejection event on 17 February 2023 is studied in detail. The complex magnetic configuration in the Active Region (AR) 13229 at N25E64 caused an intensive X2.3 flare with a peak at 19:38 UT. It is followed by a massive halo CME event observed in the LASCO C3 coronagraph with a linear speed of 930 km/s and shock speed of 1300 km/s. A low frequency Type II emission was detected in the frequency range 10 MHz – 180 kHz during 20:30 UT-04:45 UT on 18 Feb 2023 by space borne Wind/WAVES instrument. From the OMNI data, the IP shock and the ICME reached earth's magnetosphere on 20 Feb 2023. A fast forward type shock was observed using OMNI high resolution data. The IP shock and ICME affected the Galactic Cosmic ray (GCR) detection. This event caused large magnetic turbulences in sheath region caused a major geomagnetic storm (∼-100 nT).</div></div>","PeriodicalId":54727,"journal":{"name":"New Astronomy","volume":"114 ","pages":"Article 102312"},"PeriodicalIF":1.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418763","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}

{"title":"Discovery of 226 δ Scuti and γ Doradus Stars near NGC 6871 with TESS","authors":"Ai-Ying Zhou","doi":"10.1016/j.newast.2024.102297","DOIUrl":"10.1016/j.newast.2024.102297","url":null,"abstract":"<div><p>We present the discovery of 269 pulsating variable stars of <span><math><mi>δ</mi></math></span> Scuti, <span><math><mi>γ</mi></math></span> Doradus, and Maia types in the vicinity of the open cluster NGC 6871, using data from the Transiting Exoplanet Survey Satellite (<em>TESS</em>). Our small-scale regional survey centered on the <span><math><mi>δ</mi></math></span> Scuti star V1821 Cyg in the open cluster NGC 6871, covering a radius of one degree. The results include a remarkable total of 1512 newly classified variable stars, comprising the following categories: 105 <span><math><mi>δ</mi></math></span> Scuti stars, 121 <span><math><mi>γ</mi></math></span> Doradus stars, 50 Maia variables, 198 eclipsing binary systems, with 12 exhibiting pulsating or rotating components, 500+ rotating variable stars, and dozens of other types. Out of 1512 newly discovered variable stars, 108 are confirmed members of NGC 6871 with a membership probability exceeding 50%. Notably, dedicated Fourier analyses were applied to eight representative stars from the newly discovered variables. Among these, one star exhibits a rich and complex pulsation spectrum characterized by amplitude variations in dominant pulsations. To contextualize the new pulsators, we plotted them in the Hertzsprung–Russell diagrams alongside the largest known group of class member stars. Surprisingly, both <span><math><mi>δ</mi></math></span> Scuti and <span><math><mi>γ</mi></math></span> Doradus stars occupy nearly the same region in the diagrams, hinting at a potential unified pulsation mechanism. This study contributes valuable insights into the variability census of NGC 6871 and sheds light on the pulsation behavior of different stellar types. Further investigations into the physical properties and evolutionary status of these stars are warranted.</p></div>","PeriodicalId":54727,"journal":{"name":"New Astronomy","volume":"114 ","pages":"Article 102297"},"PeriodicalIF":1.9,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1384107624001118/pdfft?md5=e35b0e69d33cf80078eb497ada72afa1&pid=1-s2.0-S1384107624001118-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142259947","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}

{"title":"Investigation of motion around out-of-plane points in the restricted three-body problem with variable shape and masses","authors":"Oni Leke ,&nbsp;Veronica Cyril-Okeme ,&nbsp;Shima Stephen ,&nbsp;Jessica Gyegwe","doi":"10.1016/j.newast.2024.102311","DOIUrl":"10.1016/j.newast.2024.102311","url":null,"abstract":"<div><p>The paper examines out-of-plane equilibrium points (OEPs) of the restricted three-body problem with variable masses and shape. The bigger primary varies it shape as the lengths of the semi-axes vary with time. For the autonomized system, two pair of OEPs <span><math><msub><mi>L</mi><mrow><mn>6</mn><mo>,</mo><mn>7</mn><mi>κ</mi></mrow></msub></math></span> and <span><math><msub><mi>L</mi><mrow><mn>8</mn><mo>,</mo><mn>9</mn><mi>κ</mi></mrow></msub></math></span>, are obtained and differ from those of the non-autonomous system due to time <span><math><mi>t</mi></math></span>. The stability of OEPs of both systems is found to be unstable. Further, numerical illustrations is provided when variations in shape of the bigger primary is, a triaxial prolate, a sphere and a triaxial oblate shape. The positions, stability and zero velocity curves (ZVC) of the particle around the OEPs are explored. It is seen that when the bigger primary is a triaxial prolate body, the OEPs <span><math><msub><mi>L</mi><mrow><mn>8</mn><mo>,</mo><mn>9</mn><mi>κ</mi></mrow></msub></math></span> are closer to the primaries than <span><math><msub><mi>L</mi><mrow><mn>6</mn><mo>,</mo><mn>7</mn><mi>κ</mi></mrow></msub></math></span>. However, the converse happens when it is a triaxial oblate body. Also, when the bigger primary is a triaxial oblate body, the OEPs are farther away from the primaries than when it is a triaxial prolate. In the case of the ZVC, it is seen that when the bigger primary is a triaxial prolate body, there is a petal around it, and region of allowed motion of the particle increases, while the region reduces when the bigger primary evolves from a sphere to a triaxial oblate body. This study can be used to describe motion of a dust grain in the vicinity of Betelgeuse, a red giant star whose mass and shape changes with time and its stellar companion.</p></div>","PeriodicalId":54727,"journal":{"name":"New Astronomy","volume":"114 ","pages":"Article 102311"},"PeriodicalIF":1.9,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1384107624001258/pdfft?md5=26357da594ce5af4c57b885884db352e&pid=1-s2.0-S1384107624001258-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142241731","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}