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  • The decline of astronomical research in Venezuela
    Nat. Astron. (IF 11.518) Pub Date : 2020-08-10
    Néstor Sánchez

    During the last 15 years the number of astronomy-related papers published by scientists in Venezuela has been continuously decreasing, mainly due to emigration. If rapid corrective actions are not implemented, professional astronomy in Venezuela could disappear.

    更新日期:2020-08-10
  • Renovation by late nebular accretion
    Nat. Astron. (IF 11.518) Pub Date : 2020-08-10
    Eve J. Lee

    Secondary gas disks around main sequence stars may regenerate planetary atmospheres, potentially transforming desiccated rocky worlds into gas-enveloped sub-Neptunes that feature high metallicities and enhanced atmospheric C/O ratios.

    更新日期:2020-08-10
  • Future exploration of Ceres as an ocean world
    Nat. Astron. (IF 11.518) Pub Date : 2020-08-10
    Julie Castillo-Rogez

    Long believed to be a primitive body, Ceres is now an ocean world with deep brines at a regional and potentially global scale. Further studies at Ceres’s conditions and — above all — a follow-up mission are needed to study its evolution and potential habitability.

    更新日期:2020-08-10
  • A revealing last glance at Ceres
    Nat. Astron. (IF 11.518) Pub Date : 2020-08-10

    Before its demise, the Dawn spacecraft performed a series of low passes over the bright spots of dwarf planet Ceres. These high-resolution data highlight the nature of Ceres as an active ocean world with unique characteristics.

    更新日期:2020-08-10
  • Evidence of non-uniform crust of Ceres from Dawn’s high-resolution gravity data
    Nat. Astron. (IF 11.518) Pub Date : 2020-08-10
    R. S. Park; A. S. Konopliv; A. I. Ermakov; J. C. Castillo-Rogez; R. R. Fu; K. H. G. Hughson; T. H. Prettyman; C. A. Raymond; J. E. C. Scully; H. G. Sizemore; M. M. Sori; A. T. Vaughan; G. Mitri; B. E. Schmidt; C. T. Russell

    The gravity and shape data acquired by the Dawn spacecraft during its primary mission revealed that Ceres is partially differentiated with an interior structure consistent with a volatile-rich crust, a mantle of hydrated rock and isostatically compensated topography1,2,3. Detailed analyses showed that the mechanically strong crust overlays a weak, fluid-bearing upper mantle4. Previous studies, however

    更新日期:2020-08-10
  • Fresh emplacement of hydrated sodium chloride on Ceres from ascending salty fluids
    Nat. Astron. (IF 11.518) Pub Date : 2020-08-10
    M. C. De Sanctis; E. Ammannito; A. Raponi; A. Frigeri; M. Ferrari; F. G. Carrozzo; M. Ciarniello; M. Formisano; B. Rousseau; F. Tosi; F. Zambon; C. A. Raymond; C. T. Russell

    The surface and internal structure of Ceres show evidence of a global process of aqueous alteration, indicating the existence of an ocean in the past. However, it is not clear whether part of this ocean is still present and whether residual fluids are still circulating in the dwarf planet. These fluids may be exposed in a geologically young surface, and the most promising site to verify the occurrence

    更新日期:2020-08-10
  • Recent cryovolcanic activity at Occator crater on Ceres
    Nat. Astron. (IF 11.518) Pub Date : 2020-08-10
    A. Nathues; N. Schmedemann; G. Thangjam; J. H. Pasckert; K. Mengel; J. Castillo-Rogez; E. A. Cloutis; H. Hiesinger; M. Hoffmann; L. Le Corre; J.-Y. Li; C. Pieters; C. A. Raymond; V. Reddy; O. Ruesch; D. A. Williams

    NASA’s Dawn mission revealed a partially differentiated Ceres that has experienced cryovolcanic activity throughout its history up to the recent past. The Occator impact crater, which formed ~22 Myr ago, displays bright deposits (faculae) across its floor whose origins are still under debate: two competing hypotheses involve eruption of brines from the crust–mantle transition boundary (remnants of

    更新日期:2020-08-10
  • Impact-driven mobilization of deep crustal brines on dwarf planet Ceres
    Nat. Astron. (IF 11.518) Pub Date : 2020-08-10
    C. A. Raymond; A. I. Ermakov; J. C. Castillo-Rogez; S. Marchi; B. C. Johnson; M. A. Hesse; J. E. C. Scully; D. L. Buczkowski; H. G. Sizemore; P. M. Schenk; A. Nathues; R. S. Park; T. H. Prettyman; L. C. Quick; J. T. Keane; M. D. Rayman; C. T. Russell

    Ceres, the only dwarf planet in the inner Solar System, appears to be a relict ocean world. Data collected by NASA’s Dawn spacecraft provided evidence that global aqueous alteration within Ceres resulted in a chemically evolved body that remains volatile-rich1. Recent emplacement of bright deposits sourced from brines attests to Ceres being a persistently geologically active world2,3, but the surprising

    更新日期:2020-08-10
  • A compact object in the mass gap
    Nat. Astron. (IF 11.518) Pub Date : 2020-08-03
    Mohammadtaher Safarzadeh

    The LIGO/Virgo collaboration recently announced the detection of an unusual compact binary merger including either the most massive neutron star or the least massive black hole known. The formation path of such a binary system is still up for debate.

    更新日期:2020-08-04
  • Tracing the origins of the solar wind with helium
    Nat. Astron. (IF 11.518) Pub Date : 2020-07-27
    Michael Hahn

    A map of the helium abundance across much of the solar corona will allow us to connect in situ solar wind measurements to their sources and improve our understanding of the origins of the solar wind.

    更新日期:2020-07-27
  • Global helium abundance measurements in the solar corona
    Nat. Astron. (IF 11.518) Pub Date : 2020-07-27
    John D. Moses; Ester Antonucci; Jeffrey Newmark; Frédéric Auchère; Silvano Fineschi; Marco Romoli; Daniele Telloni; Giuseppe Massone; Luca Zangrilli; Mauro Focardi; Federico Landini; Maurizio Pancrazzi; Guglielmo Rossi; Andrea M. Malvezzi; Dennis Wang; Jean-Christophe Leclec’h; Jean-Pierre Moalic; Frédéric Rouesnel; Lucia Abbo; Aurélien Canou; Nicolas Barbey; Chloé Guennou; John M. Laming; James Lemen;

    Solar abundances have been historically assumed to be representative of cosmic abundances. However, our knowledge of the solar abundance of helium, the second most abundant element, relies mainly on models1 and indirect measurements through helioseismic observations2, because actual measurements of helium in the solar atmosphere are very scarce. Helium cannot be directly measured in the photosphere

    更新日期:2020-07-27
  • A protostellar system fed by a streamer of 10,500 au length
    Nat. Astron. (IF 11.518) Pub Date : 2020-07-27
    Jaime E. Pineda; Dominique Segura-Cox; Paola Caselli; Nichol Cunningham; Bo Zhao; Anika Schmiedeke; Maria José Maureira; Roberto Neri

    Binary formation is an important aspect of star formation. One possible route for close-in binary formation is disk fragmentation1,2,3. Recent observations show that small-scale asymmetries (<300 au) around young protostars2,4, although not always resolving the circumbinary disk, are linked to disk phenomena5,6. In later stages, resolved circumbinary disk observations7 (<200 au) show similar asymmetries

    更新日期:2020-07-27
  • Measurement of magnetic field and relativistic electrons along a solar flare current sheet
    Nat. Astron. (IF 11.518) Pub Date : 2020-07-27
    Bin Chen; Chengcai Shen; Dale E. Gary; Katharine K. Reeves; Gregory D. Fleishman; Sijie Yu; Fan Guo; Säm Krucker; Jun Lin; Gelu M. Nita; Xiangliang Kong

    In the standard model of solar flares, a large-scale reconnection current sheet is postulated to be the central engine for powering the flare energy release1,2,3 and accelerating particles4,5,6. However, where and how the energy release and particle acceleration occur remain unclear owing to the lack of measurements of the magnetic properties of the current sheet. Here we report the measurement of

    更新日期:2020-07-27
  • Demonstration of stellar intensity interferometry with the four VERITAS telescopes
    Nat. Astron. (IF 11.518) Pub Date : 2020-07-20
    A. U. Abeysekara; W. Benbow; A. Brill; J. H. Buckley; J. L. Christiansen; A. J. Chromey; M. K. Daniel; J. Davis; A. Falcone; Q. Feng; J. P. Finley; L. Fortson; A. Furniss; A. Gent; C. Giuri; O. Gueta; D. Hanna; T. Hassan; O. Hervet; J. Holder; G. Hughes; T. B. Humensky; P. Kaaret; M. Kertzman; D. Kieda; F. Krennrich; S. Kumar; T. LeBohec; T. T. Y. Lin; M. Lundy; G. Maier; N. Matthews; P. Moriarty;

    High angular resolution observations at optical wavelengths provide valuable insights into stellar astrophysics1,2, and enable direct measurements of fundamental stellar parameters3,4 and the probing of stellar atmospheres, circumstellar disks5, the elongation of rapidly rotating stars6 and the pulsations of Cepheid variable stars7. The angular size of most stars is of the order of one milliarcsecond

    更新日期:2020-07-20
  • Peer review under review
    Nat. Astron. (IF 11.518) Pub Date : 2020-07-13

    The practice of peer review has only become commonplace fairly recently, and as such is continually undergoing revision. The latest progress has focused on reducing the load on those performing this community service and also reducing bias to ensure a fairer system for all.

    更新日期:2020-07-13
  • Sending hope to Mars
    Nat. Astron. (IF 11.518) Pub Date : 2020-07-13
    O. Sharaf; S. Amiri; S. AlDhafri; P. Withnell; D. Brain

    The Emirates will shortly join the ranks of space-faring nations by sending an orbiter to Mars, aiming to make novel observations and inspire the country, write the mission leadership team.

    更新日期:2020-07-13
  • China’s first mission to Mars
    Nat. Astron. (IF 11.518) Pub Date : 2020-07-13
    W. X. Wan; C. Wang; C. L. Li; Y. Wei

    As the Tianwen-1 spacecraft is scheduled for launch in late July or early August, the mission chief scientist and his team provide an overview focusing on the scientific objectives and instrumentation of China’s first Mars mission.

    更新日期:2020-07-13
  • New maser species tracing spiral-arm accretion flows in a high-mass young stellar object
    Nat. Astron. (IF 11.518) Pub Date : 2020-07-13
    Xi Chen; Andrej M. Sobolev; Zhi-Yuan Ren; Sergey Parfenov; Shari L. Breen; Simon P. Ellingsen; Zhi-Qiang Shen; Bin Li; Gordon C. MacLeod; Willem Baan; Crystal Brogan; Tomoya Hirota; Todd R. Hunter; Hendrik Linz; Karl Menten; Koichiro Sugiyama; Bringfried Stecklum; Yan Gong; Xingwu Zheng

    Numerical simulations have predicted that substructures such as spiral arms can be produced through a gravitationally unstable disk around high-mass young stellar objects (HMYSOs)1,2,3,4,5. Recent high-resolution observations from the Atacama Large Millimeter/submillimeter Array have investigated these substructures at a spatial resolution of ~100 au (refs. 6,7,8,9,10). An accretion burst, which is

    更新日期:2020-07-13
  • Carbon star formation as seen through the non-monotonic initial–final mass relation
    Nat. Astron. (IF 11.518) Pub Date : 2020-07-06
    Paola Marigo; Jeffrey D. Cummings; Jason Lee Curtis; Jason Kalirai; Yang Chen; Pier-Emmanuel Tremblay; Enrico Ramirez-Ruiz; Pierre Bergeron; Sara Bladh; Alessandro Bressan; Léo Girardi; Giada Pastorelli; Michele Trabucchi; Sihao Cheng; Bernhard Aringer; Piero Dal Tio

    The initial–final mass relation (IFMR) links the birth mass of a star to the mass of the compact remnant left at its death. While the relevance of the IFMR across astrophysics is universally acknowledged, not all of its fine details have yet been resolved. A new analysis of a few carbon–oxygen white dwarfs in old open clusters of the Milky Way led us to identify a kink in the IFMR, located over a range

    更新日期:2020-07-06
  • Discovery of ubiquitous lithium production in low-mass stars
    Nat. Astron. (IF 11.518) Pub Date : 2020-07-06
    Yerra Bharat Kumar; Bacham E. Reddy; Simon W. Campbell; Sunayana Maben; Gang Zhao; Yuan-Sen Ting

    The vast majority of stars with mass similar to that of the Sun are expected to destroy lithium (Li) gradually over the course of their lives, via low-temperature nuclear burning. This has now been supported by observations of hundreds of thousands of red giant stars1,2,3,4,5. Here we perform a large-scale systematic investigation into the Li content of stars in the red clump phase of evolution, which

    更新日期:2020-07-06
  • Ubiquitous velocity fluctuations throughout the molecular interstellar medium
    Nat. Astron. (IF 11.518) Pub Date : 2020-07-06
    Jonathan D. Henshaw; J. M. Diederik Kruijssen; Steven N. Longmore; Manuel Riener; Adam K. Leroy; Erik Rosolowsky; Adam Ginsburg; Cara Battersby; Mélanie Chevance; Sharon E. Meidt; Simon C. O. Glover; Annie Hughes; Jouni Kainulainen; Ralf S. Klessen; Eva Schinnerer; Andreas Schruba; Henrik Beuther; Frank Bigiel; Guillermo A. Blanc; Eric Emsellem; Thomas Henning; Cynthia N. Herrera; Eric W. Koch; Jérôme

    The density structure of the interstellar medium determines where stars form and release energy, momentum and heavy elements, driving galaxy evolution1,2,3,4. Density variations are seeded and amplified by gas motion, but the exact nature of this motion is unknown across spatial scales and galactic environments5. Although dense star-forming gas probably emerges from a combination of instabilities6

    更新日期:2020-07-06
  • Evidence for a vast prograde stellar stream in the solar vicinity
    Nat. Astron. (IF 11.518) Pub Date : 2020-07-06
    Lina Necib; Bryan Ostdiek; Mariangela Lisanti; Timothy Cohen; Marat Freytsis; Shea Garrison-Kimmel; Philip F. Hopkins; Andrew Wetzel; Robyn Sanderson

    Massive dwarf galaxies that merge with the Milky Way on prograde orbits can be dragged into the disk plane before being completely disrupted. Such mergers can contribute to an accreted stellar disk and a dark matter disk. Here we present Nyx, a vast stellar stream in the vicinity of the Sun, which provides the first indication that such an event occurred in the Milky Way. We identify about 200 stars

    更新日期:2020-07-06
  • Author Correction: Re-detection and a possible time variation of soft X-ray polarization from the Crab
    Nat. Astron. (IF 11.518) Pub Date : 2020-06-30
    Hua Feng; Hong Li; Xiangyun Long; Ronaldo Bellazzini; Enrico Costa; Qiong Wu; Jiahui Huang; Weichun Jiang; Massimo Minuti; Weihua Wang; Renxin Xu; Dongxin Yang; Luca Baldini; Saverio Citraro; Hikmat Nasimi; Paolo Soffitta; Fabio Muleri; Aera Jung; Jiandong Yu; Ge Jin; Ming Zeng; Peng An; Alessandro Brez; Luca Latronico; Carmelo Sgro; Gloria Spandre; Michele Pinchera

    An amendment to this paper has been published and can be accessed via a link at the top of the paper.

    更新日期:2020-06-30
  • Hopes and concerns for astronomy of satellite constellations
    Nat. Astron. (IF 11.518) Pub Date : 2020-06-29
    Igor Levchenko; Shuyan Xu; Yue-Liang Wu; Kateryna Bazaka

    The historic launch of the first several hundred out of 12,000 planned Starlink satellites heralds the arrival of the era of ultra-large satellite constellations. If it will bring new opportunities or insurmountable challenges to astronomy will probably depend on whether you are conducting your observations in space or from the surface of the Earth.

    更新日期:2020-06-29
  • John Hugh Seiradakis
    Nat. Astron. (IF 11.518) Pub Date : 2020-06-25
    Vassiliki Kalogera; Michael Kramer

    On 3 May 2020 the Greek and extended international astronomy community lost Professor Emeritus John Hugh Seiradakis, a highly impactful, wide-reaching researcher and educator, and mentor to generations of students.

    更新日期:2020-06-25
  • Publisher Correction: Identification of plasma modes in Galactic turbulence with synchrotron polarization
    Nat. Astron. (IF 11.518) Pub Date : 2020-06-18
    Heshou Zhang; Alexey Chepurnov; Huirong Yan; Kirit Makwana; Reinaldo Santos-Lima; Sarah Appleby

    An amendment to this paper has been published and can be accessed via a link at the top of the paper.

    更新日期:2020-06-18
  • Publisher Correction: Resonance locking in giant planets indicated by the rapid orbital expansion of Titan
    Nat. Astron. (IF 11.518) Pub Date : 2020-06-16
    Valéry Lainey; Luis Gomez Casajus; Jim Fuller; Marco Zannoni; Paolo Tortora; Nicholas Cooper; Carl Murray; Dario Modenini; Ryan S. Park; Vincent Robert; Qingfeng Zhang

    An amendment to this paper has been published and can be accessed via a link at the top of the paper.

    更新日期:2020-06-16
  • Detection of green line emission in the dayside atmosphere of Mars from NOMAD-TGO observations
    Nat. Astron. (IF 11.518) Pub Date : 2020-06-15
    J.-C. Gérard; S. Aoki; Y. Willame; L. Gkouvelis; C. Depiesse; I. R. Thomas; B. Ristic; A. C. Vandaele; F. Daerden; B. Hubert; J. Mason; M. R. Patel; J.-J. López-Moreno; G. Bellucci; M. A. López-Valverde; B. Beeckman

    The oxygen emission at 557.7 nm is a ubiquitous component of the spectrum of the terrestrial polar aurora and the reason for its usual green colour1. It is also observed as a thin layer of glow surrounding the Earth near 90 km altitude in the dayside atmosphere2,3 but it has so far eluded detection in other planets. Here we report dayglow observations of the green line outside the Earth. They have

    更新日期:2020-06-15
  • Weixing Wan (万卫星)
    Nat. Astron. (IF 11.518) Pub Date : 2020-06-15
    Yong Wei

    The space and planetary science community lost a great leader, Professor Weixing Wan, on 20 May 2020, aged 62. He was a world-leading space scientist and a pioneer in China’s planetary science programme.

    更新日期:2020-06-15
  • X-raying the Universe
    Nat. Astron. (IF 11.518) Pub Date : 2020-06-12

    On the anniversary of ROSAT’s launch, we reflect on the relevance and promise of X-ray observations in all fields of astronomy. Properly laying out a plan for the future of the field will allow it to continue flourishing.

    更新日期:2020-06-12
  • Lessons from counterpart searches in LIGO and Virgo’s third observing campaign
    Nat. Astron. (IF 11.518) Pub Date : 2020-06-12
    Michael W. Coughlin

    No confirmed counterparts during LIGO and Virgo’s third observing run bring more questions than answers to the active multi-messenger community, which is adapting collaboratively and technically as expectations evolve and more data are taken.

    更新日期:2020-06-12
  • Large tides alert on Saturn
    Nat. Astron. (IF 11.518) Pub Date : 2020-06-08
    Aurélien Crida

    The measure of Titan’s incredibly large migration speed away from Saturn reveals that tidal dissipation depends on the orbital frequency. This new paradigm has many implications for the internal structure of Saturn and the history of its satellite system.

    更新日期:2020-06-08
  • Resonance locking in giant planets indicated by the rapid orbital expansion of Titan
    Nat. Astron. (IF 11.518) Pub Date : 2020-06-08
    Valéry Lainey; Luis Gomez Casajus; Jim Fuller; Marco Zannoni; Paolo Tortora; Nicholas Cooper; Carl Murray; Dario Modenini; Ryan S. Park; Vincent Robert; Qingfeng Zhang

    Saturn is orbited by dozens of moons, and the intricate dynamics of this complex system provide clues about its formation and evolution. Tidal friction within Saturn causes its moons to migrate outwards, driving them into orbital resonances that pump their eccentricities or inclinations, which in turn leads to tidal heating of the moons. However, in giant planets, the dissipative processes that determine

    更新日期:2020-06-08
  • eROSITA’s X-ray eyes on the Universe
    Nat. Astron. (IF 11.518) Pub Date : 2020-06-04
    Andrea Merloni; Kirpal Nandra; Peter Predehl

    eROSITA, a new X-ray telescope currently performing an all-sky survey of unprecedented depth, aims to provide insights into dark energy, dark matter, black holes and perhaps new phenomena that have so far been invisible.

    更新日期:2020-06-04
  • Mars polar science at the end of the world
    Nat. Astron. (IF 11.518) Pub Date : 2020-06-01
    Patricio Becerra; Isaac B. Smith; Andrea Coronato; Jorge Rabassa

    Key questions about ice on the red planet, its climate record and its potential for habitability were the subject of the seventh edition of the International Conference on Mars Polar Science and Exploration, held for the first time in the Southern Hemisphere.

    更新日期:2020-06-01
  • A plague of magnetic spots among the hot stars of globular clusters
    Nat. Astron. (IF 11.518) Pub Date : 2020-06-01
    Y. Momany; S. Zaggia; M. Montalto; D. Jones; H. M. J. Boffin; S. Cassisi; C. Moni Bidin; M. Gullieuszik; I. Saviane; L. Monaco; E. Mason; L. Girardi; V. D’Orazi; G. Piotto; A. P. Milone; H. Lala; P. B. Stetson; Y. Beletsky

    For more than six decades, the quest to understand the formation of hot (about 20,000−30,000 K) extreme horizontal branch (EHB) stars in Galactic globular clusters has remained one of the most elusive in stellar evolutionary theory. Here we report on two discoveries that challenge the idea of the stable luminosity of EHB stars. The first mode of EHB variability is periodic and cannot be ascribed to

    更新日期:2020-06-01
  • Intergalactic sleuthing with cosmic radio bursts
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-28
    Michael Shull

    The discovery of four bright fast radio bursts with accurate localization on the sky and association with nearby galaxies enabled a statistical estimate of the baryon content in the intergalactic medium and intervening galaxy halos by measuring the amount of ionized gas towards these sources.

    更新日期:2020-05-28
  • The recurrent impact of the Sagittarius dwarf on the star formation history of the Milky Way
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-25
    Tomás Ruiz-Lara; Carme Gallart; Edouard J. Bernard; Santi Cassisi

    Satellites orbiting disk galaxies can induce phase space features such as spirality, vertical heating and phase-mixing in their disks. Such features have also been observed in our own Galaxy, but the complexity of the Milky Way disk has only recently been fully mapped by Gaia Data Release 2 (DR2) data. This complex behaviour is mainly ascribed to repeated perturbations induced by the Sagittarius dwarf

    更新日期:2020-05-25
  • Identification of plasma modes in Galactic turbulence with synchrotron polarization
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-25
    Heshou Zhang; Alexey Chepurnov; Huirong Yan; Kirit Makwana; Reinaldo Santos-Lima; Sarah Appleby

    Magnetohydrodynamic turbulence is a ubiquitous and fundamental ingredient underlying many astrophysical phenomena. The multiphase nature of the interstellar medium and the diversity of driving mechanisms give rise to spatial variation of turbulence properties, particularly plasma properties. There has been no observational diagnosis of the plasma modes beyond the solar system so far. Here we report

    更新日期:2020-05-25
  • Simulations of solar filament fine structures and their counterstreaming flows
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-25
    Y. H. Zhou; P. F. Chen; J. Hong; C. Fang

    Solar filaments, also called solar prominences when appearing above the solar limb, are cold, dense materials suspended in the hot tenuous solar corona, consisting of numerous long, fibril-like threads. These threads are the key to disclosing the physics of solar filaments. Similar structures also exist in galaxy clusters. Besides their mysterious formation, filament threads are observed to move with

    更新日期:2020-05-25
  • Aerosol composition of hot giant exoplanets dominated by silicates and hydrocarbon hazes
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-25
    Peter Gao; Daniel P. Thorngren; Graham K. H. Lee; Jonathan J. Fortney; Caroline V. Morley; Hannah R. Wakeford; Diana K. Powell; Kevin B. Stevenson; Xi Zhang

    Aerosols are common in the atmospheres of exoplanets across a wide swath of temperatures, masses and ages1,2,3. These aerosols strongly impact observations of transmitted, reflected and emitted light from exoplanets, obfuscating our understanding of exoplanet thermal structure and composition4,5,6. Knowing the dominant aerosol composition would facilitate interpretations of exoplanet observations and

    更新日期:2020-05-25
  • The global current systems of the Martian induced magnetosphere
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-25
    Robin Ramstad; David A. Brain; Yaxue Dong; Jared Espley; Jasper Halekas; Bruce Jakosky

    Induced magnetospheres form around conductive non-magnetized planetary objects (such as the ionospheres of Mars, Venus, Titan, Pluto and comets) in the electrodynamic interaction with a magnetized flowing plasma, such as the solar wind. The resulting induced currents couple the ionosphere and the deflected plasma, thus they provide insight into the solar wind’s role in powering the heating, escape

    更新日期:2020-05-25
  • A ring in the distant Universe
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-25
    Ronald J. Buta

    The detection of a ring galaxy at a redshift of z = 2.2, potentially a product of a past collision with a companion galaxy, provides new insights on ring formation and the evolution of disk galaxies in the early Universe.

    更新日期:2020-05-25
  • A giant galaxy in the young Universe with a massive ring
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-25
    Tiantian Yuan; Ahmed Elagali; Ivo Labbé; Glenn G. Kacprzak; Claudia del P. Lagos; Leo Y. Alcorn; Jonathan H. Cohn; Kim-Vy H. Tran; Karl Glazebrook; Brent A. Groves; Kenneth C. Freeman; Lee R. Spitler; Caroline M. S. Straatman; Deanne B. Fisher; Sarah M. Sweet

    In the local (redshift z ≈ 0) Universe, collisional ring galaxies make up only ~0.01% of galaxies1 and are formed by head-on galactic collisions that trigger radially propagating density waves2,3,4. These striking systems provide key snapshots for dissecting galactic disks and are studied extensively in the local Universe5,6,7,8,9. However, not much is known about distant (z > 0.1) collisional rings10

    更新日期:2020-05-25
  • Publisher Correction: Salt deliquescence can support extraterrestrial life
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-15
    John E. Hallsworth

    An amendment to this paper has been published and can be accessed via a link at the top of the paper.

    更新日期:2020-05-15
  • Science in the shadow of a pandemic
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-14

    We are living in exceptional circumstances. It is not business as usual. There is no script, and where we end up after the global pandemic is partly up to us.

    更新日期:2020-05-14
  • Author Correction: Laboratory studies on the viability of life in H 2 -dominated exoplanet atmospheres
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-14
    S. Seager; J. Huang; J. J. Petkowski; M. Pajusalu

    An amendment to this paper has been published and can be accessed via a link at the top of the paper.

    更新日期:2020-05-14
  • Highlights of exoplanetary science from Spitzer
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-14
    Drake Deming; Heather A. Knutson

    Observations of extrasolar planets were not projected to be a substantial part of the Spitzer Space Telescope’s mission when it was conceived and designed. Nevertheless, Spitzer was the first facility to detect thermal emission from a hot Jupiter-sized planet, and the range of its exoplanetary investigations grew to encompass transiting planets, microlensing, brown dwarfs, and direct imaging searches

    更新日期:2020-05-14
  • Lifting the secrets of stardust
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-14
    Anna Frebel; Rebecca Surman

    The cosmic origin of the heaviest elements in the periodic table remains a mystery. Estimates of the physical locations of element-producing events within small galaxies that formed in the early Universe are now providing new clues.

    更新日期:2020-05-14
  • The X-ray polarimetry window reopens
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-14
    Hua Feng; Ronaldo Bellazzini

    PolarLight is the first dedicated soft X-ray polarimeter in space since the 1970s and is attempting to reopen this long-awaited window in astronomy, explain Principal Investigator Hua Feng and Ronaldo Bellazzini.

    更新日期:2020-05-14
  • Observations of luminous infrared galaxies with the Spitzer Space Telescope
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-14
    L. Armus; V. Charmandaris; B. T. Soifer

    Luminous and ultraluminous infrared galaxies have been an active area of galaxy research since their discovery more than three decades ago. With its vast increase in sensitivity in the infrared, Spitzer played a major role in exploring these galaxies in the local Universe, and at high redshifts. In this Review, we highlight some of the discoveries made with the Infrared Spectrograph on Spitzer, through

    更新日期:2020-05-14
  • Organic chemistry on a cool and wet young Mars
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-14
    Alberto G. Fairén

    The Curiosity rover is unveiling the persistence of habitable environments more than three-billion years ago at Gale crater, Mars. New analyses of Gale’s ancient sediments show that chemical processing of organic material occurred on a liquid-water rich and freezing early Mars.

    更新日期:2020-05-14
  • Star formation in galaxies as traced by the Spitzer Space Telescope
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-14
    Daniela Calzetti

    The Spitzer Space Telescope returned infrared images and spectra with unprecedented sensitivity and resolution, enabling the characterization of the dust-enshrouded star formation of and within galaxies. This has yielded indicators of total star formation, used as unbiased tracers of the stellar production across cosmic times.

    更新日期:2020-05-14
  • The high-redshift Universe with Spitzer
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-14
    Maruša Bradač

    When did galaxies start forming stars? What is the role of distant galaxies in galaxy formation models and the epoch of reionization? What are the conditions in typical star-forming galaxies at redshifts ≳4? Why is galaxy evolution dependent on environment? The Spitzer Space Telescope has been a crucial tool for addressing these questions. Accurate knowledge of stellar masses, ages and star formation

    更新日期:2020-05-14
  • Starquake ends hiatus in soft X-ray polarimetry
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-11
    Mózsi Kiss

    Measurements with a CubeSat gas pixel detector reveal a change in the Crab pulsar polarization after a glitch in the spin period, suggesting that starquakes alter the magnetosphere.

    更新日期:2020-05-11
  • Evidence of extensive lunar crust formation in impact melt sheets 4,330 Myr ago
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-11
    L. F. White; A. Černok; J. R. Darling; M. J. Whitehouse; K. H. Joy; C. Cayron; J. Dunlop; K. T. Tait; M. Anand

    Accurately constraining the formation and evolution of the lunar magnesian suite is key to understanding the earliest periods of magmatic crustal building that followed accretion and primordial differentiation of the Moon. However, the origin and evolution of these unique rocks is highly debated. Here, we report on the microstructural characterization of a large (~250-μm) baddeleyite (monoclinic-ZrO2)

    更新日期:2020-05-11
  • Distribution and habitability of (meta)stable brines on present-day Mars
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-11
    Edgard G. Rivera-Valentín; Vincent F. Chevrier; Alejandro Soto; Germán Martínez

    Special Regions on Mars are defined as environments able to host liquid water that simultaneously meets certain temperature and water activity requirements that allow known terrestrial organisms to replicate1,2 and therefore could be habitable. Such regions would be of concern for planetary protection policies owing to the potential for forward contamination (biological contamination from Earth). Pure

    更新日期:2020-05-11
  • Re-detection and a possible time variation of soft X-ray polarization from the Crab
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-11
    Hua Feng; Hong Li; Xiangyun Long; Ronaldo Bellazzini; Enrico Costa; Qiong Wu; Jiahui Huang; Weichun Jiang; Massimo Minuti; Weihua Wang; Renxin Xu; Dongxin Yang; Luca Baldini; Saverio Citraro; Hikmat Nasimi; Paolo Soffitta; Fabio Muleri; Aera Jung; Jiandong Yu; Ge Jin; Ming Zeng; Peng An; Alessandro Brez; Luca Latronico; Carmelo Sgro; Gloria Spandre; Michele Pinchera

    The Crab nebula is so far the only celestial object with a statistically significant detection in soft X-ray polarimetry1,2,3,4, a window that has not been explored in astronomy since the 1970s. However, soft X-ray polarimetry is expected to be a sensitive probe of magnetic fields in high-energy astrophysical objects, including rotation-powered pulsars5,6,7 and pulsar wind nebulae8. Here we report

    更新日期:2020-05-11
  • Salt deliquescence as a source of water
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-11
    John E. Hallsworth

    In the event of accidental transmission of microbes to other planets, we must consider whether the local conditions would allow their proliferation. Whereas temperatures on Mars are usually hostile to life, liquid water is available from deliquescing salts.

    更新日期:2020-05-11
  • Publisher Correction: A small and round heliosphere suggested by magnetohydrodynamic modelling of pick-up ions
    Nat. Astron. (IF 11.518) Pub Date : 2020-05-05
    Merav Opher; Abraham Loeb; James Drake; Gabor Toth

    An amendment to this paper has been published and can be accessed via a link at the top of the paper.

    更新日期:2020-05-05
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