Nature Astronomy最新文献_第7页

Discovery and dynamics of a Sedna-like object with a perihelion of 66 au 发现一颗近日点为66天文单位的类塞德娜天体及其动力学

IF 14.3 1区物理与天体物理

Nature Astronomy Pub Date : 2025-07-14 DOI: 10.1038/s41550-025-02595-7

Ying-Tung Chen, Patryk Sofia Lykawka, Yukun Huang, JJ Kavelaars, Wesley C. Fraser, Michele T. Bannister, Shiang-Yu Wang, Chan-Kao Chang, Matthew J. Lehner, Fumi Yoshida, Brett Gladman, Mike Alexandersen, Edward Ashton, Young-Jun Choi, A. Paula Granados Contreras, Takashi Ito, Youngmin JeongAhn, Jianghui Ji, Myung-Jin Kim, Samantha M. Lawler, Jian Li, Zhong-Yi Lin, Hong-Kyu Moon, Surhud More, Marco Muñoz-Gutiérrez, Keiji Ohtsuki, Lowell Peltier, Rosemary E. Pike, Tsuyoshi Terai, Seitaro Urakawa, Hui Zhang, Haibin Zhao, Ji-Lin Zhou

{"title":"Discovery and dynamics of a Sedna-like object with a perihelion of 66 au","authors":"Ying-Tung Chen, Patryk Sofia Lykawka, Yukun Huang, JJ Kavelaars, Wesley C. Fraser, Michele T. Bannister, Shiang-Yu Wang, Chan-Kao Chang, Matthew J. Lehner, Fumi Yoshida, Brett Gladman, Mike Alexandersen, Edward Ashton, Young-Jun Choi, A. Paula Granados Contreras, Takashi Ito, Youngmin JeongAhn, Jianghui Ji, Myung-Jin Kim, Samantha M. Lawler, Jian Li, Zhong-Yi Lin, Hong-Kyu Moon, Surhud More, Marco Muñoz-Gutiérrez, Keiji Ohtsuki, Lowell Peltier, Rosemary E. Pike, Tsuyoshi Terai, Seitaro Urakawa, Hui Zhang, Haibin Zhao, Ji-Lin Zhou","doi":"10.1038/s41550-025-02595-7","DOIUrl":"10.1038/s41550-025-02595-7","url":null,"abstract":"Trans-Neptunian objects (TNOs) with large perihelion distances (q > 60 au) and semi-major axes (a > 200 au) provide insights into the early evolution of the Solar System and the existence of a hypothetical distant planet. These objects are challenging to observe, and thus their detections are still rare, yet they play a crucial role in constraining models of Solar System formation. Here we report the discovery of a Sedna-like TNO, 2023 KQ14, nicknamed ‘Ammonite’, with q = 66 au, a = 252 au and inclination i = 11°. The orbit of Ammonite does not align with those of the other Sedna-like objects and fills the previously unexplained ‘q-gap’ in the observed distribution of distant Solar System objects. Simulations demonstrate that Ammonite is dynamically stable over 4.5 Gyr. Our analysis suggests that Ammonite and the other Sedna-like objects may have shared a primordial orbital clustering around 4.2 Ga. Furthermore, the stable orbit of Ammonite favours larger orbits (~500 au) rather than closer ones for a large hypothetical planet in present-day trans-Neptunian space. The discovery of 2023 KQ14, a Sedna-like object with a perihelion of 66 au, fills a gap in the known population. Its orbit does not align with other Sedna-like objects, shedding light on the diversity and dynamical history of the outer Solar System.","PeriodicalId":18778,"journal":{"name":"Nature Astronomy","volume":"9 9","pages":"1309-1316"},"PeriodicalIF":14.3,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.comhttps://www.nature.com/articles/s41550-025-02595-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Peering beyond radio flashes with multi-messenger insight into FRB engines 透过无线电闪光，透过多信使洞察快速射电暴引擎

IF 14.3 1区物理与天体物理

Nature Astronomy Pub Date : 2025-07-10 DOI: 10.1038/s41550-025-02611-w

Mohit Bhardwaj, Maura McLaughlin

引用次数: 0

How to prepare competitive proposals and job applications 如何准备有竞争力的建议书和工作申请

IF 14.3 1区物理与天体物理

Nature Astronomy Pub Date : 2025-07-10 DOI: 10.1038/s41550-025-02593-9

Johan H. Knapen, Henri M. J. Boffin, Nushkia Chamba, Natashya Chamba

引用次数: 0

Kinematic distortions of the high-redshift Universe as seen from quasar proper motions 从类星体固有运动观察到的高红移宇宙的运动学畸变

IF 14.3 1区物理与天体物理

Nature Astronomy Pub Date : 2025-07-03 DOI: 10.1038/s41550-025-02591-x

Valeri Makarov

{"title":"Kinematic distortions of the high-redshift Universe as seen from quasar proper motions","authors":"Valeri Makarov","doi":"10.1038/s41550-025-02591-x","DOIUrl":"10.1038/s41550-025-02591-x","url":null,"abstract":"Advances in optical astrometry allow us to infer the non-radial kinematic structure of the Universe directly from observations. Here I use a supervised machine learning neural network method to predict 1.57 million redshifts based on several photometric and metadata classifier parameters from the unWISE mid-infrared database and from Gaia. These estimates are used to divide the sample into three redshift bins: 1–2, 2–3 and >3. For each subset, all available Gaia proper motions are used in a global vector spherical harmonic solution to degree 3 (30 fitting vector functions). I find significant differences in a few fitted proper motion patterns at different redshifts. The largest signals are seen in the comparison of the vector spherical harmonic fits for the 1–2 and 2–3 redshift bins. The significant harmonics include a rigid spin, a dipole glide from the north Galactic pole to the south and an additional quadrupole distortion. Validation tests with filtered subsamples indicate that the detected effect can be caused by hidden systematic errors in astrometry. The results are verified by using an independent source of redshifts and computing the observer’s Galactocentric acceleration. This study offers a new observational test of alternative cosmological models. Supervised machine learning predicts 1.57 million quasar redshifts from Gaia Data Release 3 photometry and astrometry, providing a new observational test of the cosmological principle.","PeriodicalId":18778,"journal":{"name":"Nature Astronomy","volume":"9 9","pages":"1396-1403"},"PeriodicalIF":14.3,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144547613","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

Earth-like planets prefer circles 类地行星更喜欢圆形

IF 14.3 1区物理与天体物理

Nature Astronomy Pub Date : 2025-07-02 DOI: 10.1038/s41550-025-02608-5

Ji-Wei Xie

引用次数: 0

A new class of rocky exoplanets? 一类新的岩石系外行星？

IF 14.3 1区物理与天体物理

Nature Astronomy Pub Date : 2025-07-02 DOI: 10.1038/s41550-025-02607-6

Renyu Hu

引用次数: 0

Calcium in a supernova remnant as a fingerprint of a sub-Chandrasekhar-mass explosion 超新星遗迹中的钙作为次钱德拉塞卡质量爆炸的指纹

IF 14.3 1区物理与天体物理

Nature Astronomy Pub Date : 2025-07-02 DOI: 10.1038/s41550-025-02589-5

Priyam Das, Ivo R. Seitenzahl, Ashley J. Ruiter, Friedrich K. Röpke, Rüdiger Pakmor, Frédéric P. A. Vogt, Christine E. Collins, Parviz Ghavamian, Stuart A. Sim, Brian J. Williams, Stefan Taubenberger, J. Martin Laming, Janette Suherli, Ralph Sutherland, Nicolás Rodríguez-Segovia

{"title":"Calcium in a supernova remnant as a fingerprint of a sub-Chandrasekhar-mass explosion","authors":"Priyam Das, Ivo R. Seitenzahl, Ashley J. Ruiter, Friedrich K. Röpke, Rüdiger Pakmor, Frédéric P. A. Vogt, Christine E. Collins, Parviz Ghavamian, Stuart A. Sim, Brian J. Williams, Stefan Taubenberger, J. Martin Laming, Janette Suherli, Ralph Sutherland, Nicolás Rodríguez-Segovia","doi":"10.1038/s41550-025-02589-5","DOIUrl":"10.1038/s41550-025-02589-5","url":null,"abstract":"Type Ia supernovae play a fundamental role as cosmological probes of dark energy and produce more than half of the iron in our Galaxy. Despite their central importance, a comprehensive understanding of their progenitor systems and triggering mechanism is still a long-standing fundamental problem. Here we present high-resolution integral field spectroscopic observations of the young supernova remnant SNR 0509-67.5 in the Large Magellanic Cloud. We uncover a double-shell morphology of highly ionized calcium [Ca XV] and a single shell of sulphur [S XII], observed in the reverse shocked ejecta. Our analysis reveals that the outer calcium shell originates from the helium detonation at the base of the outer envelope, while the inner shell is associated with the carbon–oxygen core detonation. This morphological distribution of intermediate-mass elements agrees qualitatively with the predicted signature of the double detonation of a sub-Chandrasekhar-mass white dwarf from a hydrodynamical explosion simulation. Our observations reveal two distinct, spatially separated peaks in surface brightness of [Ca XV] from the supernova remnant phase, providing substantial evidence that sub-Chandrasekhar-mass explosions through the double-detonation mechanism could occur in nature. They also highlight the importance of remnant tomography in understanding explosion mechanisms from the remnant phase. Observations of the young supernova remnant SNR 0509-67.5 in the Large Magellanic Cloud reveal concentric shells of ionized calcium and sulfur that resemble hydrodynamical simulations of the double detonation of a sub-Chandrasekhar-mass white dwarf.","PeriodicalId":18778,"journal":{"name":"Nature Astronomy","volume":"9 9","pages":"1356-1365"},"PeriodicalIF":14.3,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.comhttps://www.nature.com/articles/s41550-025-02589-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144533768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

A high mutual inclination system around KOI-134 revealed by transit timing variations 通过凌日时间变化揭示了KOI-134周围的高互倾角系统

IF 14.3 1区物理与天体物理

Nature Astronomy Pub Date : 2025-06-27 DOI: 10.1038/s41550-025-02594-8

Emma Nabbie, Chelsea X. Huang, Judith Korth, Hannu Parviainen, Su Wang, Alexander Venner, Robert Wittenmyer, Allyson Bieryla, David W. Latham, Gongjie Li, Douglas N. C. Lin, George Zhou

{"title":"A high mutual inclination system around KOI-134 revealed by transit timing variations","authors":"Emma Nabbie, Chelsea X. Huang, Judith Korth, Hannu Parviainen, Su Wang, Alexander Venner, Robert Wittenmyer, Allyson Bieryla, David W. Latham, Gongjie Li, Douglas N. C. Lin, George Zhou","doi":"10.1038/s41550-025-02594-8","DOIUrl":"10.1038/s41550-025-02594-8","url":null,"abstract":"Few planetary systems have measured mutual inclinations, and even fewer are found to be non-coplanar. Observing the gravitational interactions between exoplanets is an effective tool to detect non-transiting companions to transiting planets. Evidence of these interactions can manifest in the light curve through transit timing variations (TTVs) and transit duration variations (TDVs). Here, through analysis of Kepler photometry and joint TTV–TDV modelling, we confirm the detection of KOI-134 b, a transiting planet with mass and size similar to Jupiter on a period of ~67 days, and find that it exhibits high TTVs (20-h amplitude) and significant TDVs. We explain these signals with the presence of an innermost non-transiting planet in 2:1 resonance with KOI-134 b. KOI-134 c has a mass $$M=0.22{0}_{-0.011}^{+0.010}{M}_{{rm{Jup}}}$$ and a moderately high mutual inclination with KOI-134 b of $${i}_{{rm{mut}}}=15.{4}_{-2.5}^{+2.{8}^{circ }}$$ . Moreover, the inclination variations of KOI-134 b are so large that the planet is predicted to stop transiting in about 100 years. This system architecture cannot be easily explained by any one formation mechanism, with other dynamical effects needed to excite the planets’ mutual inclination while still preserving their resonance. Using Kepler, this study identifies a compact multiplanetary system that is not flat, where gravitational interactions cause its planets’ periods to change by nearly a day per cycle and their orbital planes to tilt back and forth.","PeriodicalId":18778,"journal":{"name":"Nature Astronomy","volume":"9 9","pages":"1317-1325"},"PeriodicalIF":14.3,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144500396","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

Formation of Mercury by a grazing giant collision involving similar-mass bodies 水星的形成是由类似质量的天体碰撞形成的

IF 14.3 1区物理与天体物理

Nature Astronomy Pub Date : 2025-06-27 DOI: 10.1038/s41550-025-02582-y

Patrick Franco, Fernando Roig, Othon C. Winter, Rafael Sfair, Christoph Burger, Christoph M. Schäfer

{"title":"Formation of Mercury by a grazing giant collision involving similar-mass bodies","authors":"Patrick Franco, Fernando Roig, Othon C. Winter, Rafael Sfair, Christoph Burger, Christoph M. Schäfer","doi":"10.1038/s41550-025-02582-y","DOIUrl":"10.1038/s41550-025-02582-y","url":null,"abstract":"The origin of Mercury still remains poorly understood compared with the other rocky planets of the Solar System. To explain its internal structure, it is usually considered to be the product of a giant impact. However, most studies assume a binary collision between bodies of substantially different masses, which seems to be unlikely according to N-body simulations. Here, we perform smoothed-particle hydrodynamics simulations to investigate the conditions under which collisions of similar-mass bodies are able to form a Mercury-like planet. Our results show that such collisions can fulfil the necessary constraints in terms of mass (0.055 M⊕) and composition (30/70 silicate-to-iron mass ratio) within less than 5%, as long as the impact angles and velocities are properly adjusted according to well established scaling laws. With these results, we broaden the scope of plausible formation scenarios by presenting those that are more frequent in numerical simulations, less constrained in planetary contexts and thus more likely to happen. A model with a more plausible collision scenario explains the formation of Mercury through a giant impact between two bodies of similar size. The model also obtains very accurate results in terms of the iron core-mass fraction.","PeriodicalId":18778,"journal":{"name":"Nature Astronomy","volume":"9 8","pages":"1158-1166"},"PeriodicalIF":14.3,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144500394","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

Probable impact scenarios reproduce the structure of Mercury 可能的撞击场景再现了水星的结构

IF 14.3 1区物理与天体物理

Nature Astronomy Pub Date : 2025-06-27 DOI: 10.1038/s41550-025-02583-x

引用次数: 0