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The impact of interplanetary magnetic field intensity on the Martian ionosphere Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-12 Yihui Song, Yun Li, Haoyu Lu, Jinbin Cao, Shibang Li
Context. The interplanetary magnetic field (IMF) is one of the important external drivers that controls the Martian-induced magnetosphere and ionosphere. Previous studies have shown that the ion escape process is highly influenced by both the direction and intensity of the IMF. The enhanced IMF may decrease the ion escape rate by inducing a stronger magnetosphere that protects the Martian ionosphere
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Hybrid simulation method for agglomerate evolution in driven granular gases Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-12 F. Führer, J. Schwaak, L. Brendel, G. Wurm, D. E. Wolf
Aims. We present a new hybrid simulation method for protoplanetary dust evolution that is efficient and takes into account the complex fragmentation and agglomeration dynamics. We applied it to simulate the evolution of agglomerate size distributions for turbulent, charged systems.Methods. The hybrid method combines kinetic Monte Carlo and discrete element simulations in such a way that the expensive
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Wavelength-dependent far-infrared polarization of HL Tau observed with SOFIA/HAWC+ Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-12 Moritz Lietzow-Sinjen, Sebastian Wolf, Robert Brunngräber
We present the first polarimetric observations of a circumstellar disk in the far-infrared wavelength range. We report flux and linear polarization measurements of the young stellar object HL Tau in the bands A (53 μm), C (89 μm), D (155 μm), and E (216 μm) with the High-resolution Airborne Wideband Camera-plus (HAWC+) on board of the Stratospheric Observatory for Infrared Astronomy (SOFIA). The orientation
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Cyclical accretion regime change in the slow X-ray pulsar 4U 0114+65 observed with Chandra Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-12 G. Sanjurjo-Ferrín, J. M. Torrejón, K. Postnov, M. Nowak, J. J. Rodes-Roca, L. Oskinova, J. Planelles-Villalva, N. Schulz
4U 0114+65 is a high-mass X-ray binary system formed by the luminous supergiant B1Ia, known as V* V662 Cas, and one of the slowest rotating neutron stars (NSs) with a spin period of about 2.6 hours. This provides a rare opportunity to study interesting details of the accretion within each individual pulse of the compact object. For this paper we analyzed 200 ks of Chandra grating data, divided into
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Multiband embeddings of light curves Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-12 I. Becker, P. Protopapas, M. Catelan, K. Pichara
In this work, we propose a novel ensemble of recurrent neural networks (RNNs) that considers the multiband and non-uniform cadence without having to compute complex features. Our proposed model consists of an ensemble of RNNs, which do not require the entire light curve to perform inference, making the inference process simpler. The ensemble is able to adapt to varying numbers of bands, tested on three
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Planetary inward migration as the potential cause of GJ 504’s fast rotation and bright X-ray luminosity Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-12 C. Pezzotti, G. Buldgen, E. Magaudda, M. Farnir, V. Van Grootel, S. Bellotti, K. Poppenhaeger
Context. The discovery of an increasing variety of exoplanets in very close orbits around their host stars raised many questions about how stars and planets interact and to what extent host stars’ properties may be influenced by the presence of close-by companions. Understanding how the evolution of stars is impacted by the interactions with their planets is indeed fundamental to disentangling their
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MOCKA – A PLATO mock asteroseismic catalogue: Simulations for gravity-mode oscillators Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-12 N. Jannsen, A. Tkachenko, P. Royer, J. De Ridder, D. Seynaeve, C. Aerts, S. Aigrain, E. Plachy, A. Bodi, M. Uzundag, D. M. Bowman, D. J. Fritzewski, L. W. IJspeert, G. Li, M. G. Pedersen, M. Vanrespaille, T. Van Reeth
Context. With the PLAnetary Transits and Oscillation of stars (PLATO) space mission set for launch in December 2026 by the European Space Agency (ESA), a new photometric legacy and a future of new scientific discoveries await the community. By exploring scientific topics outside of the core science program, the PLATO complementary science program (PLATO-CS) provides a unique opportunity to maximise
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An Hα view of galaxy buildup in the first 2 Gyr: Luminosity functions at z ∼ 4−6.5 from NIRCam/grism spectroscopy Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-12 Alba Covelo-Paz, Emma Giovinazzo, Pascal A. Oesch, Romain A. Meyer, Andrea Weibel, Gabriel Brammer, Yoshinobu Fudamoto, Josephine Kerutt, Jamie Lin, Jasleen Matharu, Rohan P. Naidu, Anna Velichko, Victoria Bollo, Rychard Bouwens, John Chisholm, Garth D. Illingworth, Ivan Kramarenko, Daniel Magee, Michael Maseda, Jorryt Matthee, Erica Nelson, Naveen Reddy, Daniel Schaerer, Mauro Stefanon, Mengyuan Xiao
The Hα nebular emission line is an optimal tracer for recent star formation in galaxies. With the advent of JWST, this line has recently become observable at z > 3 for the first time. We present a catalog of 1050 Hα emitters at 3.7 < z < 6.7 in the GOODS fields obtained from a blind search in JWST NIRCam/grism data. We made use of the FRESCO survey’s 124 arcmin2 of observations in GOODS-North and GOODS-South
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Search for the multi-wavelength counterparts to extragalactic unassociated Fermi γ-ray sources Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-12 A. Ulgiati, S. Paiano, F. Pintore, T. D. Russell, B. Sbarufatti, C. Pinto, E. Ambrosi, A. D’Aì, G. Cusumano, M. Del Santo
Aims. We searched for the multi-wavelength (X-ray, optical, and radio) counterparts to the unassociated gamma-ray sources (UGS) of the Fermi 4FGL-DR4 catalogue. The main goal was to identify new blazars and/or new active galactic nuclei that emit at GeV energies [such as (narrow-line) Seyfert-1 and radio galaxies].Methods. We focused on sky regions that were observed by the Swift satellite and that
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Evolutionary tracks, ejecta, and ionizing photons from intermediate-mass to very massive stars with PARSEC⋆ Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-12 G. Costa, K. G. Shepherd, A. Bressan, F. Addari, Y. Chen, X. Fu, G. Volpato, C. T. Nguyen, L. Girardi, P. Marigo, A. Mazzi, G. Pastorelli, M. Trabucchi, D. Bossini, S. Zaggia
Recent advancements in stellar evolution modeling offer unprecedented accuracy in predicting the evolution and deaths of stars. We present new stellar evolutionary models computed with the updated PARSEC V2.0 code for a comprehensive and homogeneous grid of metallicities and initial masses. Nuclear reaction networks, mass loss prescriptions, and the treatment of elemental mixing have all been updated
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Evolution of the disky second generation of stars in globular clusters on cosmological timescales Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 Peter Berczik, Taras Panamarev, Maryna Ishchenko, Bence Kocsis
Context. Many Milky Way globular clusters (GCs) host multiple stellar populations, challenging the traditional view that GCs are single-population systems. It has been suggested that second-generation stars could form in a disk from gas lost by first-generation stars or from external accreted gas. Understanding how these multiple stellar populations evolve under a time-varying Galactic tidal field
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Investigation of the pulsations, outbursts, and evolution of the yellow hypergiants Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 A. M. van Genderen, A. Lobel, R. Timmerman, E. R. Deul, A. Vos, H. Nieuwenhuijzen, E. J. van Ballegoij, M. Sblewski, G. W. Henry, E. Blown, G. Di Scala
In this predominantly photometric study, we investigate various types of photometric and physical instabilities in the yellow hypergiant (YHG) ρ Cas as well as its evolution between 1885 and 2023. The second yellow hypergiant we study is YHG HR 8752, which recently became stable. The other two yellow hypergiants are HR 5171A and HD 179821. We constructed temperature calibration relations based on Teff
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The Southern Twenty-centimetre All-sky Polarization Survey (STAPS): Survey description and maps Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 X. Sun, M. Haverkorn, E. Carretti, T. Landecker, B. M. Gaensler, S. Poppi, L. Staveley-Smith, X. Gao, J. Han
We present data processing and verification of the Southern Twenty-centimetre All-sky Polarization Survey (STAPS) conducted with Murriyang, the Parkes 64-m telescope. The survey covers the sky area of −89° < Dec < 0° and the frequency range of 1.3–1.8 GHz split into 1-MHz channels. STAPS was observed commensally with the S-band Polarization All-Sky Survey (S-PASS). The survey is composed of long azimuth
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The ESO SupJup Survey Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 W. Mulder, S. de Regt, R. Landman, D. González Picos, I. A. G. Snellen, Y. Zhang, S. Gandhi, C. Ginski, A. Y. Kesseli, E. Nasedkin, T. Stolker
Context. Recent research suggests that the distinct formation processes of exoplanets and brown dwarfs may have an influence on the chemical and isotopic composition of their atmospheres. Variations in the carbon 12C/13C isotope ratio have been observed and tentatively linked to the top-down formation of brown dwarfs and the core accretion pathway of super-Jupiters. The ESO SupJup Survey, conducted
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Temperature and density profiles in the corona of main-sequence stars induced by stochastic heating in the chromosphere Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 Luca Barbieri, Lapo Casetti, Andrea Verdini, Simone Landi
All but the most massive main-sequence stars are expected to have a rarefied and hot (million-Kelvin) corona like the Sun. How such a hot corona is formed and supported has not been completely understood yet, even in the case of the Sun. Recently, a new model of a confined plasma atmosphere has been introduced and applied to the solar case, showing that rapid, intense, intermittent and short-lived
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Stellar magnetic activity in Earth 2.0 candidates based on LAMOST DR10 Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 Tianhao Su, Liyun Zhang, Xianming L. Han, Prabhakar Misra, Zhongzhong Zhu, Qingfeng Pi
Aims. Stellar chromospheric activity can impact the search for exoplanets. Earth 2.0 (ET 2.0) is a space telescope designed for exoplanet detection. In this work, we survey the stellar chromospheric activity in the ET 2.0 target regions to enhance the detection rate of exoplanets.Methods. This work uses Hα and Ca II H&K lines as indicators of chromospheric activity and conducts a survey of stellar
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Newborn Be star systems observed shortly after mass transfer Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 Th. Rivinius, R. Klement, S. D. Chojnowski, D. Baade, M. Abdul-Masih, N. Przybilla, J. Guarro Fló, B. Heathcote, P. Hadrava, D. Gies, K. Shepard, C. Buil, O. Garde, O. Thizy, J. D. Monnier, N. Anugu, C. Lanthermann, G. Schaefer, C. Davies, S. Kraus, J. Ennis, B. R. Setterholm, T. Gardner, N. Ibrahim, S. Chhabra, M. Gutierrez, I. Codron
Context. Many classical Be stars acquire their very rapid rotation by mass- and angular-momentum transfer in massive binaries, marking the first phase of the evolutionary chain. Later-stage products, such as Be+subdwarf- and Be+neutron-star binaries (Be X-ray binaries), are also well known, although the search for definitive proof of Be+white dwarf companions is ongoing. Short-lived intermediate-phase
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Searching for Galactic red supergiants with Gaia RVS spectra Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 Zehao Zhang, Biwei Jiang, Yi Ren, He Zhao, Ming Yang
Red supergiants (RSGs) are essential to understanding the evolution and the contribution to the interstellar medium of massive stars. However, the number of identified RSGs within the Milky Way is still limited, mainly due to the difficulty of measuring stellar extinction and distance. The release of approximately one million RVS spectra in Gaia DR3 presents a new opportunity for identifying Galactic
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Planetary nebulae of the Large Magellanic Cloud Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 P. Ventura, S. Tosi, D. A. García-Hernández, F. Dell’Agli, D. Kamath, L. Stanghellini, S. Bianchi, M. Tailo, M. A. Gómez-Muñoz
Context. The study of planetary nebulae (PNe) offers the opportunity to evaluate the efficiency of the dust production mechanism during the very late asymptotic giant branch (AGB) phases, which allows us to assess the role played by AGB stars as dust manufacturers.Aims. We studied the relationship between the properties of PNe, particularly the gas and dust content, and the mass and metallicity of
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Non-linear internal waves breaking in stellar-radiation zones Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 S. Mathis
Context. Internal gravity waves (IGWs) are one of the mechanisms that can play a key role in efficiently redistributing angular momentum in stars along their evolution. The study of IGWs is thus of major importance since space-based asteroseismology reveals a transport of angular momentum in stars, which is stronger by two orders of magnitude than the one predicted by stellar models ignoring their
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JOYS: The [D/H] abundance derived from protostellar outflows across the Galactic disk measured with JWST Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 L. Francis, E. F. van Dishoeck, A. Caratti o Garatti, M. L. van Gelder, C. Gieser, H. Beuther, T. P. Ray, L. Tychoniec, P. Nazari, S. Reyes, P. J. Kavanagh, P. Klaassen, M. Güdel, T. Henning
Context. The total deuterium abundance [D/H] in the universe is set by just two processes: the creation of deuterium in Big Bang nucleosynthesis at an abundance of [D/H] = 2.58 ± 0.13 × 10−5, and its destruction within stellar interiors (astration). Measurements of variations in the total [D/H] abundance can thus potentially provide a probe of Galactic chemical evolution. However, most observational
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Frozen and β-equilibrated f and p modes of cold neutron stars: Nuclear metamodel predictions Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 Gabriele Montefusco, Marco Antonelli, Francesca Gulminelli
Context. When the chemical re-equilibration timescale is sufficiently long, the normal and quasi-normal mode frequencies of neutron stars should be calculated in the idealised limit that the internal composition of each fluid element is fixed over the oscillation period. However, many studies rely on a barotropic equation of state, implicitly overlooking potential out-of-β-equilibrium effects.Aims
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The Solar System’s passage through the Radcliffe wave during the middle Miocene Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 E. Maconi, J. Alves, C. Swiggum, S. Ratzenböck, J. Großschedl, P. Köhler, N. Miret-Roig, S. Meingast, R. Konietzka, C. Zucker, A. Goodman, M. Lombardi, G. Knorr, G. Lohmann, J. C. Forbes, A. Burkert, M. Opher
Context. As the Solar System orbits the Milky Way, it encounters various Galactic environments, including dense regions of the interstellar medium (ISM). These encounters can compress the heliosphere, exposing parts of the Solar System to the ISM, while also increasing the influx of interstellar dust into the Solar System and Earth’s atmosphere. The discovery of new Galactic structures, such as the
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Tracing magnetic switchbacks to their source: An assessment of solar coronal jets as switchback precursors Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 N. Bizien, C. Froment, M. S. Madjarska, T. Dudok de Wit, M. Velli
Context. The origin of large-amplitude magnetic field deflections in the solar wind, known as magnetic switchbacks, is still under debate. These structures, which are ubiquitous in the in situ observations made by Parker Solar Probe (PSP), likely have their seed in the lower solar corona, where small-scale energetic events driven by magnetic reconnection could provide conditions ripe for either direct
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The impact of mass uncertainties on r-process nucleosynthesis in neutron star mergers Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 Sébastien Martinet, Stephane Goriely
Context. Theoretically predicted yields of elements created by the rapid neutron capture (r-) process carry potentially large uncertainties associated with incomplete knowledge of nuclear properties and approximative hydrodynamical modeling of the matter ejection processes. One of the dominant uncertainties in determining the ejecta composition and radioactive decay heat stems from the still unknown
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Separating deterministic and stochastic gravitational wave signals in realistic pulsar timing array datasets Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 Irene Ferranti, Golam Shaifullah, Aurelien Chalumeau, Alberto Sesana
Recent observations by pulsar timing arrays (PTAs) suggest the presence of gravitational wave (GW) signals that potentially originate from supermassive black hole binaries (SMBHBs). These binaries can generate two kinds of signals: a stochastic gravitational wave background (GWB) or a deterministic continuous gravitational wave (CGW). The ability to correctly recognize and separate them is crucial
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The SRG/eROSITA All-Sky Survey: Large-scale view of the Centaurus cluster Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 Angie Veronica, Thomas H. Reiprich, Florian Pacaud, Jeremy S. Sanders, Efrain Gattuzz, Michael C. H. Yeung, Esra Bulbul, Vittorio Ghirardini, Ang Liu, Caroline Mannes, Alexander Morelli, Naomi Ota
Context. The Centaurus cluster is one of the brightest and closest clusters. Previous comprehensive studies were done only in its brightest part (r < 30′), where the centers of the main substructures (Cen 30 and Cen 45) are located, and only a small fraction of the outskirts has been studied.Aims. Through this work, we aim to characterize the intracluster medium (ICM) morphology and properties of the
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Probing red supergiant atmospheres and winds with early-time, high-cadence, high-resolution type II supernova spectra Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 Luc Dessart
High-cadence high-resolution spectroscopic observations of infant Type II supernovae (SNe) represent an exquisite probe of the atmospheres and winds of exploding red-supergiant (RSG) stars. Using radiation hydrodynamics and radiative transfer calculations, we studied the gas and radiation properties during and after the phase of shock breakout, considering RSG star progenitors enshrouded within a circumstellar
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Improvements to monoscopic analysis for imaging atmospheric Cherenkov telescopes: Application to H.E.S.S. Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 Tim Unbehaun, Rodrigo Guedes Lang, Anita Deka Baruah, Prajath Bedur Ramesh, Jelena Celic, Lars Mohrmann, Simon Steinmassl, Laura Olivera-Nieto, Jim Hinton, Stefan Funk
Imaging atmospheric Cherenkov telescopes (IACTs) detect γ rays by measuring the Cherenkov light emitted by secondary particles in the air shower when the γ rays hit the atmosphere of the Earth. Given usual distances between telescopes in IACT arrays, at low energies (≲100 GeV), the limited amount of Cherenkov light produced typically implies that the event is registered by one IACT only. Such events
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PITSZI: Probing intra-cluster medium turbulence with Sunyaev–Zel’dovich imaging Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 R. Adam, T. Eynard-Machet, I. Bartalucci, D. Cherouvrier, N. Clerc, L. Di Mascolo, S. Dupourqué, C. Ferrari, J.-F. Macías-Pérez, E. Pointecouteau, G. W. Pratt
Turbulent gas motions are expected to dominate the non-thermal energy budget of the intracluster medium (ICM). The measurement of pressure fluctuations from high angular resolution Sunyaev–Zel’dovich imaging opens a new avenue to study ICM turbulence, complementary to X-ray density fluctuation measures. We developed a methodological framework designed to optimally extract information on the ICM pressure
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The ALMA-ATOMS survey: Vibrationally excited HC3N lines in hot cores Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 Li Chen, Sheng-Li Qin, Tie Liu, Paul F. Goldsmith, Xunchuan Liu, Yaping Peng, Xindi Tang, Guido Garay, Zhiping Kou, Mengyao Tang, Patricio Sanhueza, Zi-Yang Li, Prasanta Gorai, Swagat R. Das, Leonardo Bronfman, Lokesh Dewangan, Pablo García, Shanghuo Li, Chang Won Lee, Hong-Li Liu, L. Viktor Tóth, James O. Chibueze, Jihye Hwang, Xiaohu Li, Fengwei Xu, Jiahang Zou, Wenyu Jiao, Zhenying Zhang, Yong Zhang
Context. Interstellar molecules are excellent tools for studying the physical and chemical environments of massive star-forming regions. In particular, the vibrationally excited HC3N (HC3N*) lines are the key tracers for probing hot cores environments.Aims. We present the Atacama Large Millimeter/submillimeter Array (ALMA) 3 mm observations of HC3N* lines in 60 hot cores and investigate how the physical
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A multi-wavelength view of the isolated neutron star eRASSU J065715.3+260428⋆ Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-11 J. Kurpas, A. M. Pires, A. D. Schwope, Z. C. Pan, Z. L. Zhang, L. Qian, F. Haberl, L. Ji, I. Traulsen
On the premise of a soft spectral distribution and absence of counterparts, the X-ray source eRASSU J065715.3+260428 was recently identified as a likely thermally emitting isolated neutron star (XINS) in a search in the SRG/eROSITA All-Sky Survey. We investigated the nature and evolutionary state of the neutron star through a dedicated multi-wavelength follow-up observational campaign with XMM-Newton
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Euclid preparation Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-10 N. Tessore, B. Joachimi, A. Loureiro, A. Hall, G. Cañas-Herrera, I. Tutusaus, N. Jeffrey, K. Naidoo, J. D. McEwen, A. Amara, S. Andreon, N. Auricchio, C. Baccigalupi, M. Baldi, S. Bardelli, F. Bernardeau, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, A. Caillat, S. Camera, V. Capobianco, C. Carbone, V. F. Cardone, J. Carretero, S. Casas, M. Castellano, G. Castignani, S. Cavuoti, A. Cimatti, C
In this paper we present the framework for measuring angular power spectra in the Euclid mission. The observables in galaxy surveys, such as galaxy clustering and cosmic shear, are not continuous fields, but discrete sets of data, obtained only at the positions of galaxies. We show how to compute the angular power spectra of such discrete data sets, without treating observations as maps of an underlying
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Euclid: A complete Einstein ring in NGC 6505⋆ Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-10 C. M. O’Riordan, L. J. Oldham, A. Nersesian, T. Li, T. E. Collett, D. Sluse, B. Altieri, B. Clément, K. G. C. Vasan, S. Rhoades, Y. Chen, T. Jones, C. Adami, R. Gavazzi, S. Vegetti, D. M. Powell, J. A. Acevedo Barroso, I. T. Andika, R. Bhatawdekar, A. R. Cooray, G. Despali, J. M. Diego, L. R. Ecker, A. Galan, P. Gómez-Alvarez, L. Leuzzi, M. Meneghetti, R. B. Metcalf, M. Schirmer, S. Serjeant, C. Tortora
We report the discovery of a complete Einstein ring around the elliptical galaxy NGC 6505, at z = 0.042. This is the first strong gravitational lens discovered in Euclid and the first in an NGC object from any survey. The combination of the low redshift of the lens galaxy, the brightness of the source galaxy (IE = 18.1 lensed, IE = 21.3 unlensed), and the completeness of the ring make this an exceptionally
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Black hole accretion and radiation variability in general relativistic magnetohydrodynamic simulations with Rezzolla–Zhidenko spacetime Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 Kotaro Moriyama, Alejandro Cruz-Osorio, Yosuke Mizuno, Indu K. Dihingia, Akhil Uniyal
The Event Horizon Telescope (EHT) has unveiled the horizon-scale radiation properties of Sagittarius A* (Sgr A*), the supermassive black hole at the center of our galaxy, providing a novel platform for testing gravitational theories by comparing observations with theoretical models. A key next step is to investigate the nature of accretion flows and spacetime structures near black holes by analyzing
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An accurate and simple asymptotically matched deprojection of the Sérsic law Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 L. Ciotti, L. De Deo, S. Pellegrini
Context. The Sérsic law reproduces very well the surface brightness profile of early-type galaxies, and therefore it is routinely used in observational and theoretical works. Unfortunately, its deprojection cannot be expressed in terms of elementary functions for generic values of the shape parameter n. Over the years, different families of approximate deprojection formulae have been proposed, generally
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Euclid: Detecting Solar System objects in Euclid images and classifying them using Kohonen self-organising maps★ Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 A. A. Nucita, L. Conversi, A. Verdier, A. Franco, S. Sacquegna, M. Pöntinen, B. Altieri, B. Carry, F. De Paolis, F. Strafella, V. Orofino, M. Maiorano, V. Kansal, R. D. Vavrek, M. Miluzio, M. Granvik, V. Testa, N. Aghanim, S. Andreon, N. Auricchio, M. Baldi, S. Bardelli, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, V. Capobianco, C. Carbone, J. Carretero, S. Casas, M. Castellano, G. Castignani
The ESA Euclid mission will survey more than 14 000 deg2 of the sky in visible and near-infrared wavelengths, mapping the extragalactic sky to constrain our cosmological model of the Universe. Although the survey focusses on regions further than 15° from the ecliptic, it should allow for the detection of more than about 105 Solar System objects (SSOs). After simulating the expected signal from SSOs
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The cold neutral medium in filaments at high Galactic latitudes Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-10 P. M. W. Kalberla
Context. The H I distribution at high Galactic latitudes has been found to be filamentary and closely related to the far infrared (FIR) in caustics with coherent velocity structures. These structures trace the orientation of magnetic field lines.Aims. Recent absorption observations with the Australian SKA Pathfinder Telescope have led to major improvements in the understanding of the physical properties
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Repeated pattern of γ-ray flares in the blazar PKS 1502+106 coincident with the IC190730A neutrino event Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-10 Dmitry Blinov, Polina Novikova
Context. It has been demonstrated that at least 10% of the brightest blazars in the fourth Fermi-LAT catalog of γ-ray sources exhibit repeating patterns of γ-ray flares. These events may be associated with the presence of a non-uniform sheath surrounding a fast jet spine in some blazars. Theoretical models suggest that such a sheath could facilitate neutrino production in these structured jets.Aims
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A candidate quadruple AGN system at z ∼ 3 Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-10 Eileen Herwig, Fabrizio Arrigoni Battaia, Eduardo Bañados, Emanuele P. Farina
Multiple galaxies hosting active galactic nuclei (AGNs) at kiloparsec separations from each other are exceedingly rare, and in fact, only one quadruple AGN is known so far. These extreme densities of AGNs are expected to pinpoint protocluster environments and therefore should be surrounded by large galaxy overdensities. In this Letter, we present another quadruple AGN candidate at z ∼ 3 including two
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Using the STIX background detector as a proxy for GOES Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-10 Muriel Zoë Stiefel, Matej Kuhar, Olivier Limousin, Ewan C. M. Dickson, Anna Volpara, Gordon J. Hurford, Säm Krucker
Context. The Spectrometer/Telescope for Imaging X-Rays (STIX) on board Solar Orbiter was designed to observe solar flares in the X-ray range of 4−150 keV, providing spectral, temporal, and spatial information. Besides 30 imaging detectors, STIX has two additional detectors: the coarse flare locator (CFL) and the background (BKG) detector, which are used in the present study. Flares observed from Earth
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Atmospheric dynamics of the hypergiant RW Cep during the Great Dimming Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-10 A. Kasikov, I. Kolka, A. Aret, T. Eenmäe, S. P. D. Borthakur, V. Checha, V. Mitrokhina, S. Yang
Context. The hypergiant RW Cep is one of the largest stars in the Galaxy. The evolution and mass loss of such stars have profound effects on their surrounding regions and their galaxy as a whole. Between 2020 and 2024, RW Cep experienced a historic mass-loss event known as the Great Dimming.Aims. This study provides a spectroscopic analysis of RW Cep during the Great Dimming. We examine its atmospheric
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Extreme exomoons in WASP-49 Ab: Dynamics and detectability Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 Mario Sucerquia, Nicolás Cuello
Context. WASP-49Ab, a low-density Saturn-like planet in a tight orbit around a Sun-like star within a wide binary system, is a compelling candidate for hosting a volcanic moon, as suggested by the detection of Doppler-shifted sodium.Aims. This study evaluates the stability of potential satellites around WASP-49Ab under the influence of planetary oblateness, relativistic effects, and perturbations from
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Glitch-induced pulse profile change of PSR J0742−2822 observed from the IAR Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 E. Zubieta, F. García, S. del Palacio, C. M. Espinoza, S. B. Araujo Furlan, G. Gancio, C. O. Lousto, J. A. Combi, E. Gügercinoğlu
Context. The radio pulsar PSR J0742−2822 is known to exhibit rapid changes between different pulse profile states that correlate with changes in its spin-down rate. However, the connection between these variations and the glitch activity of the pulsar remains unclear.Aims. We aim to study the evolution of the pulse profile and spin-down rate of PSR J0742−2822 in the period MJD 58810–60149 (November
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The conceptual design of the 50-meter Atacama Large Aperture Submillimeter Telescope (AtLAST) Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 Tony Mroczkowski, Patricio A. Gallardo, Martin Timpe, Aleksej Kiselev, Manuel Groh, Hans Kaercher, Matthias Reichert, Claudia Cicone, Roberto Puddu, Pierre Dubois-dit-Bonclaude, Daniel Bok, Erik Dahl, Mike Macintosh, Simon Dicker, Isabelle Viole, Sabrina Sartori, Guillermo Andrés Valenzuela Venegas, Marianne Zeyringer, Michael Niemack, Sergio Poppi, Rodrigo Olguin, Evanthia Hatziminaoglou, Carlos De
The (sub)millimeter sky contains a vast wealth of information that is both complementary and inaccessible to other wavelengths. Over half the light we receive is observable at millimeter and submillimeter wavelengths, yet we have mapped only a small portion of the sky at sufficient spatial resolution and sensitivity to detect and resolve distant galaxies or star-forming cores within their large- scale
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Cold gas bubble inflated by a low-luminosity radio jet Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 Suma Murthy, Raffaella Morganti, Tom Oosterloo, Dipanjan Mukherjee, Suude Bayram, Pierre Guillard, Alexander Y. Wagner, Geoffrey Bicknell
We present NOEMA CO(2–1) observations of a nearby, young, low-luminosity radio source, B2 0258+35. Our earlier CO(1–0) study had shown the presence of strong jet-ISM interaction and a massive molecular gas outflow involving 75% of the circumnuclear gas. Our follow-up CO(2–1) observations have revealed even more complex gas kinematics, where the southern radio jet is driving out molecular gas in the
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The relation between black hole spin, star formation rate, and black hole mass for supermassive black holes Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-10 Yongyun Chen, Qiusheng Gu, Junhui Fan, Xiaotong Guo, Dingrong Xiong, Xiaoling Yu, Xiaogu Zhong, Nan Ding
Both theoretical models and observational evidence indicate that jets and/or outflows driven by central active supermassive black holes exert a significant feedback effect on the overall properties of their host galaxies. Theoretical models suggest that the spin of supermassive black holes drives relativistic jets. Therefore, we investigate the relationship between black hole spin, star formation rate
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TOI-5108 b and TOI 5786 b: Two transiting sub-Saturns detected and characterized with TESS, MaHPS, and SOPHIE Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 Luis Thomas, Guillaume Hébrard, Hanna Kellermann, Judith Korth, Neda Heidari, Thierry Forveille, Sérgio G. Sousa, Laura Schöller, Arno Riffeser, Claus Gössl, Juan Serrano Bell, Flavien Kiefer, Nathan Hara, Frank Grupp, Juliana Ehrhardt, Felipe Murgas, Karen A. Collins, Allyson Bieryla, Hannu Parviainen, Alexandr A. Belinski, Emma Esparza-Borges, David R. Ciardi, Catherine A. Clark, Akihiko Fukui, Emily
We report the discovery and characterization of two sub-Saturns from the Transiting Exoplanet Survey Satellite (TESS) using high- resolution spectroscopic observations from the MaHPS spectrograph at the Wendelstein Observatory and the SOPHIE spectrograph at the Haute-Provence Observatory. Combining photometry from TESS, KeplerCam, LCOGT, and MuSCAT2, along with the radial velocity measurements from
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Transit-timing variations in the AU Mic system observed with CHEOPS★ Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-10 Á. Boldog, Gy. M. Szabó, L. Kriskovics, L. Borsato, D. Gandolfi, M. Lendl, M. N. Günther, A. Heitzmann, T. G. Wilson, A. Brandeker, Z. Garai, Y. Alibert, R. Alonso, T. Bárczy, D. Barrado Navascues, S. C. C. Barros, W. Baumjohann, W. Benz, N. Billot, C. Broeg, A. Collier Cameron, A. C. M. Correia, Sz. Csizmadia, P. E. Cubillos, M. B. Davies, M. Deleuil, A. Deline, O. D. S. Demangeon, B.-O. Demory, A
Context. AU Mic is a very active M dwarf star with an edge-on debris disk and two known transiting sub-Neptunes with a possible third planetary companion. The two transiting planets exhibit significant transit-timing variations (TTVs) that are caused by the gravi tational interaction between the bodies in the system.Aims. Using photometrical observations taken with the CHaracterizing ExOPlanet Satellite
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Revisiting the fundamental parameters for the black hole X-ray transient Swift J1753.5–0127 Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 I. V. Yanes-Rizo, M. A. P. Torres, J. Casares, P. G. Jonker, J. Sánchez-Sierras, T. Muñoz-Darias, M. Armas Padilla
We present time-resolved Gran Telescopio Canarias optical spectroscopy and William Herschel Telescope i-band photometry of the X-ray transient SWIFT J1753.5–0127 in quiescence. The i-band light curve is dominated by flickering with an amplitude of ∼0.5 mag and shows no evidence of the ellipsoidal modulation of the companion star. The telluric-corrected average spectrum, on the other hand, reveals the
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Irradiation origin and stability of CO on trans-Neptunian objects Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 E. Hénault, R. Brunetto, N. Pinilla-Alonso, D. Baklouti, Z. Djouadi, A. Guilbert-Lepoutre, T. Müller, S. Cryan, A. C. de Souza-Feliciano, B. J. Holler, M. N. de Prá, J. P. Emery, L. T. McClure, C. Schambeau, Y. Pendleton, B. Harvison, J. Licandro, V. Lorenzi, D. Cruikshank, N. Peixinho, M. T. Bannister, J. Stansberry
Context. The James Webb Space Telescope large program DiSCo-TNOs has recently shown that CO2 ice is ubiquitous on 54 mediumsize trans-Neptunian objects (TNOs). TNO surfaces are found to define three main spectral and thus compositional groups that are likely linked to their position before planetary migration. CO ice is observed on the spectral type that is richest in CO2 and on the type that is richer
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Cosmic rays cannot explain the high ionisation rates in the Galactic centre Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 S. Ravikularaman, S. Recchia, V. H. M. Phan, S. Gabici
Context. The H2 ionisation rate in the central molecular zone, located in the Galactic centre, is estimated to be ζ ∼ 2 × 10−14 s−1, based on observations of H3+ lines. This value is two to three orders of magnitude larger than that measured anywhere else in the Galaxy.Aims. Due to the high density of the gas in the central molecular zone, UV and X-ray photons do not penetrate this region. Hence, cosmic
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Hubble expansion signature on simulated halo density profiles Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-10 Giorgos Korkidis, Vasiliki Pavlidou
Context. Density profiles are important tools in galaxy cluster research, offering insights into clusters dynamical states and their relationship with the broader Universe. While these profiles provide valuable information about the matter content of the Universe, their utility in understanding its dark energy component has remained limited due to a lack of tools allowing us to study the transition
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Cooling rate and turbulence in the intracluster medium of the cool-core cluster Abell 2667 Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 M. Lepore, C. Pinto, P. Tozzi, M. Gaspari, F. Gastaldello, A. Liu, P. Rosati, R. van Weeren, G. Cresci, E. Iani, G. Rodighiero
Context. We present a detailed analysis of the thermal X-ray emission from the intracluster medium in the cool-core galaxy cluster Abell 2667 at z = 0.23.Aims. Our main goal is to detect low-temperature (< 2 keV) X-ray emitting gas associated with a potential cooling flow connecting the hot intracluster medium reservoir to the cold gas phase responsible for star formation and supermassive black hole
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Connecting energetic electrons at the Sun and in the heliosphere through X-ray and radio diagnostics Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 David Paipa-Leon, Nicole Vilmer, Milan Maksimovic, Vratislav Krupar, Antonio Vecchio
Context. Solar flares release huge amounts of energy, a considerable part of which is channeled into particle acceleration in the lower corona. Hard X-ray (HXR) emissions are used to diagnose the accelerated electrons that bombard the chromosphere, while type III radio bursts result from energetic electron beams propagating through the corona and into interplanetary space. The Solar Orbiter mission
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VLT VIMOS integral field spectroscopy of the nova remnant FH Ser Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 M. A. Guerrero, E. Santamaría, L. Takeda, J. I. González-Carbajal, S. Cazzoli, A. Ederoclite, J. A. Toalá
Context. The source FH Ser experienced a slow classical nova outburst in February 1970 that was the first ever observed at UV, optical, and IR wavelengths. Its nova remnant is elliptical and has multiple knots. A peculiar ring-like filament lies along its minor axis.Aims. We investigate here the true 3D spatio-kinematical structure of FH Ser to assess the effects of early shaping and to assess its
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Enlargement of depressions on comet 81P/Wild 2: Constraints based on 30-year cometary activity in the inner Solar System Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 Bumhoo Lim, Masateru Ishiguro
Context. The Stardust flyby mission to Jupiter-family comet (JFC) 81P/Wild 2 (hereafter, 81P) captured its dense quasicircular depressions. The formation mechanism behind these depressions remains a subject of debate.Aims. We aim to study how cometary activity contributed to the formation and enlargement of these depressions by analyzing Stardust flyby images and ground-based observation data.Methods
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Metal-THINGS: The Milky Way twin candidate NGC 3521 Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 L. S. Pilyugin, M. A. Lara-López, G. Tautvaišienė, I. A. Zinchenko, L. E. Garduño, M. E. De Rossi, J. Zaragoza-Cardiel, S. Dib, G. Valé
The 3D spectrophotometry measurements of the galaxy NGC 3521, a structural Milky Way analogue (sMWA), were carried out within the Metal-THINGS project. We found that the oxygen abundance in the inner part of NGC 3521 is at a nearly constant level and the O/H gradient is negative at larger radii. The change in the nitrogen abundance with radius is similar to that for oxygen with the break in the N/H
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Discovery and characterization of ZTF J0112+5827: An 80.9-minute polar with strong cyclotron features Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 Jiamao Lin, Liangliang Ren, Chengyuan Li, Elias-Rosa Nancy, Tianqi Cang, Hongwei Ge, Pak-Hin Thomas Tam, Wenjun Huang, Yilong Li, Xiaofeng Wang, Yang Huang, Bo Ma
Context. A new X-ray Cataclysmic variable (CV) candidate exhibits distinct light-curve characteristics in the ZTF’s g, r, and i bands. The paper includes the optical identification and multiwavelength analysis of this CV candidate.Aims. This work aims to determine if a previously identified CV candidate, ZTF J0112+5827, is a polar system by examining its X-ray and cyclotron radiation characteristics
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The clus model in SPEX: Projection and resonant scattering effects on the iron abundance and temperature profiles of galaxy clusters Astron. Astrophys. (IF 5.4) Pub Date : 2025-02-07 Lýdia Štofanová, Aurora Simionescu, Jelle S. Kaastra
In this paper we introduce the clus model, which has been newly implemented in the X-ray spectral fitting software package SPEX. Based on 3D radial profiles of the gas density, temperature, and metal abundance as well as the turbulent, inflow, and outflow velocities, the clus model creates spectra for a chosen projected region on the sky. Additionally, it can also take into account the resonant scattering