Nature Astronomy最新文献_第3页

Oceans under the light of moribund stars

IF 12.9 1区物理与天体物理

Nature Astronomy Pub Date : 2025-01-23 DOI: 10.1038/s41550-025-02476-z

Luca Maltagliati

引用次数: 0

The main barriers to distributed interaction are not technological

IF 12.9 1区物理与天体物理

Nature Astronomy Pub Date : 2025-01-23 DOI: 10.1038/s41550-024-02460-z

Vanessa A. Moss, Glen A. Rees, Aidan W. Hotan, Elizabeth J. Tasker, Rika Kobayashi, Emily F. Kerrison, Clancy W. James, Krzysztof Bolejko, Taïssa Danilovich, Emma Rehn, Ron D. Ekers

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The growth of super-large pre-planetary pebbles to an impact erosion limit 超大型行星前鹅卵石的生长达到了撞击侵蚀的极限

IF 14.1 1区物理与天体物理

Nature Astronomy Pub Date : 2025-01-22 DOI: 10.1038/s41550-024-02470-x

J. Teiser, J. Penner, K. Joeris, F. C. Onyeagusi, J. E. Kollmer, D. Daab, G. Wurm

{"title":"The growth of super-large pre-planetary pebbles to an impact erosion limit","authors":"J. Teiser, J. Penner, K. Joeris, F. C. Onyeagusi, J. E. Kollmer, D. Daab, G. Wurm","doi":"10.1038/s41550-024-02470-x","DOIUrl":"https://doi.org/10.1038/s41550-024-02470-x","url":null,"abstract":"The early evolution of dust in protoplanetary disks is dominated by sticking collisions. However, this initial phase of particle growth faces constraints, notably from destructive encounters. To find the maximum particle size achievable, we studied collisional processes during a prolonged microgravity experiment aboard a suborbital flight. Specifically, we describe an impact erosion limit. We observed individual basalt beads, each measuring 0.5 mm in diameter, colliding with and either eroding or adhering to a cluster several centimetres in size. This cluster, formed from tribocharged particles, simulates an electrostatic growth phase that surpasses the classical bouncing barrier. We found a threshold velocity of about 0.5 m s−1, which separates additive and erosive impacts of individual beads. Numerical simulations of grains impacting clusters, for both low and high charge constituents, corroborate the experimental findings of surface erosion within the observed velocity range. This specific velocity threshold supports the potential formation of pebbles several centimetres in size within protoplanetary disks. Such dimensions place these pebbles well into a regime in which hydrodynamic interactions might facilitate the formation of planetesimals.","PeriodicalId":18778,"journal":{"name":"Nature Astronomy","volume":"62 1","pages":""},"PeriodicalIF":14.1,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142991875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Charged particles grow to stable planetesimal progenitors 带电粒子成长为稳定的星子母体

IF 14.1 1区物理与天体物理

Nature Astronomy Pub Date : 2025-01-22 DOI: 10.1038/s41550-024-02471-w

引用次数: 0

Experimental constraints on the symmetron field with a magnetically levitated force sensor 磁悬浮力传感器对称场的实验约束

IF 14.1 1区物理与天体物理

Nature Astronomy Pub Date : 2025-01-20 DOI: 10.1038/s41550-024-02465-8

Peiran Yin, Xiangyu Xu, Kenan Tian, Shaochun Lin, Yuanji Sheng, Chengjiang Yin, Dingjiang Long, Chang-Kui Duan, Pu Huang, Jian-hua He, Jiangfeng Du

{"title":"Experimental constraints on the symmetron field with a magnetically levitated force sensor","authors":"Peiran Yin, Xiangyu Xu, Kenan Tian, Shaochun Lin, Yuanji Sheng, Chengjiang Yin, Dingjiang Long, Chang-Kui Duan, Pu Huang, Jian-hua He, Jiangfeng Du","doi":"10.1038/s41550-024-02465-8","DOIUrl":"https://doi.org/10.1038/s41550-024-02465-8","url":null,"abstract":"Dark energy, a mysterious form of energy that pervades the entire Universe, is believed to be responsible for the Universe’s accelerated expansion. Various theoretical attempts have been made to explain the elusive nature of dark energy. One of the compelling theories is the so-called symmetron dark energy, which predicts a fifth force that interacts with matter. However, the screening of the fifth force in high-density environments poses a challenge for laboratory experiments. Although several experiments have constrained certain aspects of the model’s parameter space, there is still a vast and unexplored region. Here we have constructed an experimental platform based on a magnetically levitated force sensor with a specially designed structure to search for the symmetron fifth force at the submillimetre scale and minimize screening effects. We have improved the limits of the model by over six orders of magnitude within the three-dimensional parameter space. Our findings demonstrate the substantial potential of this system in probing forces beyond the Standard Model.","PeriodicalId":18778,"journal":{"name":"Nature Astronomy","volume":"8 1","pages":""},"PeriodicalIF":14.1,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Symmetron dark energy constrained using a magnetically levitated force sensor 利用磁悬浮力传感器约束对称暗能量

IF 14.1 1区物理与天体物理

Nature Astronomy Pub Date : 2025-01-20 DOI: 10.1038/s41550-024-02467-6

引用次数: 0

Direct imaging of active galactic nucleus outflows and their origin with the 23 m Large Binocular Telescope 用23米大型双筒望远镜直接成像活动星系核外流及其起源

IF 14.1 1区物理与天体物理

Nature Astronomy Pub Date : 2025-01-17 DOI: 10.1038/s41550-024-02461-y

J. W. Isbell, S. Ertel, J.-U. Pott, G. Weigelt, M. Stalevski, J. Leftley, W. Jaffe, R. G. Petrov, N. Moszczynski, P. Vermot, P. Hinz, L. Burtscher, V. Gámez Rosas, A. Becker, J. Carlson, V. Faramaz-Gorka, W. F. Hoffmann, J. Leisenring, J. Power, K. Wagner

{"title":"Direct imaging of active galactic nucleus outflows and their origin with the 23 m Large Binocular Telescope","authors":"J. W. Isbell, S. Ertel, J.-U. Pott, G. Weigelt, M. Stalevski, J. Leftley, W. Jaffe, R. G. Petrov, N. Moszczynski, P. Vermot, P. Hinz, L. Burtscher, V. Gámez Rosas, A. Becker, J. Carlson, V. Faramaz-Gorka, W. F. Hoffmann, J. Leisenring, J. Power, K. Wagner","doi":"10.1038/s41550-024-02461-y","DOIUrl":"https://doi.org/10.1038/s41550-024-02461-y","url":null,"abstract":"Active galactic nuclei (AGNs) are a key component of galaxy evolution owing to feedback on the host from its supermassive black hole. The morphology of warm inflowing and outflowing dusty material can reveal the nature of the onset of feedback, AGN feeding and the unified model of AGN. Here we use the Large Binocular Telescope Interferometer (LBTI) to image the dense, obscuring disk and extended dusty outflow region of NGC 1068. In Fizeau imaging mode, the LBTI synthesizes the equivalent resolution of a 22.8 m telescope. The 8.7 μm Fizeau images of NGC 1068 have an effective resolution of 47 × 90 mas (3.3 × 6.2 pc) in a 5″ field of view after performing point spread function deconvolution techniques described here. This is the only extragalactic source to be Fizeau imaged using the LBTI, and the images bridge the scales measured with the Very Large Telescope Interferometer (0.5–5 pc) and those of single telescopes such as James Webb Space Telescope and Keck (>15 pc). The images detect and spatially resolve the low surface brightness mid-infrared features in the AGN disk/wind region that are overresolved by the Very Large Telescope Interferometer. The images show strong correlation between mid-infrared dust emission and near-infrared emission of highly excited atomic lines observed by SINFONI. Such LBTI imaging is a precursor to infrared imaging using the upcoming generation of extremely large telescopes, with angular resolutions up to six times better than James Webb Space Telescope, the largest space telescope in orbit.","PeriodicalId":18778,"journal":{"name":"Nature Astronomy","volume":"7 1","pages":""},"PeriodicalIF":14.1,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142987399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 emission of interpulses by a 6.45-h-period coherent radio transient 6.45 h周期相干无线电瞬变脉冲的互脉冲发射

IF 14.1 1区物理与天体物理

Nature Astronomy Pub Date : 2025-01-15 DOI: 10.1038/s41550-024-02452-z

Y. W. J. Lee, M. Caleb, Tara Murphy, E. Lenc, D. L. Kaplan, L. Ferrario, Z. Wadiasingh, A. Anumarlapudi, N. Hurley-Walker, V. Karambelkar, S. K. Ocker, S. McSweeney, H. Qiu, K. M. Rajwade, A. Zic, K. W. Bannister, N. D. R. Bhat, A. Deller, D. Dobie, L. N. Driessen, K. Gendreau, M. Glowacki, V. Gupta, J. N. Jahns-Schindler, A. Jaini, C. W. James, M. M. Kasliwal, M. E. Lower, R. M. Shannon, P. A. Uttarkar, Y. Wang, Z. Wang

{"title":"The emission of interpulses by a 6.45-h-period coherent radio transient","authors":"Y. W. J. Lee, M. Caleb, Tara Murphy, E. Lenc, D. L. Kaplan, L. Ferrario, Z. Wadiasingh, A. Anumarlapudi, N. Hurley-Walker, V. Karambelkar, S. K. Ocker, S. McSweeney, H. Qiu, K. M. Rajwade, A. Zic, K. W. Bannister, N. D. R. Bhat, A. Deller, D. Dobie, L. N. Driessen, K. Gendreau, M. Glowacki, V. Gupta, J. N. Jahns-Schindler, A. Jaini, C. W. James, M. M. Kasliwal, M. E. Lower, R. M. Shannon, P. A. Uttarkar, Y. Wang, Z. Wang","doi":"10.1038/s41550-024-02452-z","DOIUrl":"https://doi.org/10.1038/s41550-024-02452-z","url":null,"abstract":"Long-period radio transients are a new class of astronomical objects characterized by prolonged periods ranging from 18 min to 54 min. They exhibit highly polarized, coherent, beamed radio emission lasting only 10–100 s. The intrinsic nature of these objects is subject to speculation, with highly magnetized white dwarfs and neutron stars being the prevailing candidates. Here we present ASKAP J183950.5−075635.0, boasting the longest known period of this class at 6.45 h. It exhibits emission characteristics of an ordered dipolar magnetic field, with pulsar-like bright main pulses and weaker interpulses offset by about half a period that are indicative of an oblique or orthogonal rotator. This phenomenon, observed in a long-period radio transient, confirms that the radio emission originates from both magnetic poles and that the observed period corresponds to the rotation period. The spectroscopic and polarimetric properties of ASKAP J183950.5−075635.0 are consistent with a neutron star origin, and this object is a crucial piece of evidence in our understanding of long-period radio sources and their links to neutron stars.","PeriodicalId":18778,"journal":{"name":"Nature Astronomy","volume":"1 1","pages":""},"PeriodicalIF":14.1,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Surveys of the scientific community on the existence of extraterrestrial life 科学界对外星生命存在的调查

IF 12.9 1区物理与天体物理

Nature Astronomy Pub Date : 2025-01-14 DOI: 10.1038/s41550-024-02451-0

Peter Vickers, Emma Gardiner, Catherine Gillen, Byron Hyde, Cyrille Jeancolas, Samantha Mitchell Finnigan, Julie Nekola Nováková, Henning Strandin, Ufuk Tasdan, Henry Taylor, Sean McMahon

引用次数: 0

Moon experienced more large impacts than we currently see on its surface 月球经历了比我们目前在其表面看到的更大的撞击

IF 14.1 1区物理与天体物理

Nature Astronomy Pub Date : 2025-01-13 DOI: 10.1038/s41550-024-02445-y

引用次数: 0