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Angular momentum transport via gravitational instability in the Elias 2–27 disc Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-28 C. Longarini, G. Lodato, C. J. Clarke, J. Speedie, T. Paneque-Carreño, E. Arrigoni, P. Curone, C. Toci, C. Hall
Gravitational instability is thought to be one of the main drivers of angular momentum transport in young protoplanetary discs. The disc around Elias 2−27 offers a unique example of gravitational instability at work. It is young and massive, displaying two prominent spiral arms in dust continuum emission and global non-axisymmetric kinematic signatures in molecular line data. In this work, we used
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Laboratory and astronomical discovery of cyanothioketene, NCCHCS, in the cold starless core TMC-1⋆⋆⋆ Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-27 C. Cabezas, M. Agúndez, Y. Endo, B. Tercero, Y.-P. Lee, N. Marcelino, P. de Vicente, J. Cernicharo
We present the detection of cyanothioketene, NCCHCS, in the laboratory and toward TMC-1. This transient species was produced through a discharge of a gas mixture of CH2CHCN and CS2 using argon as carrier gas, and its rotational spectrum between 9 and 40 GHz was characterized using a Balle-Flygare narrowband-type Fourier-transform microwave spectrometer. A total of 21 rotational transitions were detected
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Detection of extragalactic magnetic massive stars Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-27 S. Hubrig, M. Schöller, S. P. Järvinen, A. Cikota, M. Abdul-Masih, A. Escorza, R. Jayaraman
Context. Studies of the magnetic characteristics of massive stars have recently received significant attention because they are progenitors of highly magnetised compact objects. Stars initially more massive than about 8 M⊙ leave behind neutron stars and black holes by the end of their evolution. The merging of binary compact remnant systems produces astrophysical transients detectable by gravitational
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Evidence of a toroidal magnetic field in the core of 3C 84 Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-27 G. F. Paraschos, L. C. Debbrecht, J. A. Kramer, E. Traianou, I. Liodakis, T. P. Krichbaum, J.-Y. Kim, M. Janssen, D. G. Nair, T. Savolainen, E. Ros, U. Bach, J. A. Hodgson, M. Lisakov, N. R. MacDonald, J. A. Zensus
The spatial scales of relativistic radio jets, probed by relativistic magneto-hydrodynamic (RMHD) jet launching simulations and by most very long baseline interferometry (VLBI) observations differ by an order of magnitude. Bridging the gap between these RMHD simulations and VLBI observations requires selecting nearby active galactic nuclei (AGN), the parsec-scale region of which can be resolved. The
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Expected performance of the Pyramid wavefront sensor with a laser guide star for 40 m class telescopes Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-24 F. Oyarzún, V. Chambouleyron, B. Neichel, T. Fusco, A. Guesalaga
Context. The use of artificial laser guide stars (LGS) is planned for the new generation of giant segmented mirror telescopes in order to extend the sky coverage of their adaptive optics systems. The LGS, being a 3D object at a finite distance, will have a large elongation that will affect its use with the Shack–Hartmann (SH) wavefront sensor.Aims. In this paper, we compute the expected performance
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Gas, not dust: Migration of TESS/Gaia hot Jupiters possibly halted by the magnetospheres of protoplanetary disks Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-24 I. Mendigutía, J. Lillo-Box, M. Vioque, J. Maldonado, B. Montesinos, N. Huélamo, J. Wang
Context. The presence of short-period (< 10 days) planets around main sequence (MS) stars has been associated either with the dust-destruction region or with the magnetospheric gas-truncation radius in the protoplanetary disks that surround them during the pre-MS phase. However, previous analyses have only considered low-mass FGK stars, making it difficult to disentangle the two scenarios.Aims. This
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The CO-dark molecular gas in the cold H I arc Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-20 Gan Luo, Di Li, Zhi-Yu Zhang, Thomas G. Bisbas, Ningyu Tang, Lingrui Lin, Yichen Sun, Pei Zuo, Jing Zhou
i i narrow self-absorption (HINSA). This is the first detection of HINSA in the outer disk region, in which the HINSA fraction ($N_ HINSA $/$N_ H_2 $ = 0.022pm 0.011) is an order of magnitude higher than the average value observed in nearby evolved dark clouds, but is consistent with that of the early evolutionary stage of dark clouds. The inferred H$_2$ column density from both extinction and OH emission
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Extended high-ionization [Mg IV] emission tracing widespread shocks in starbursts seen by JWST/NIRSpec Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-20 Miguel Pereira-Santaella, Ismael Garcia-Bernete, Eduardo Gonzalez-Alfonso, Almudena Alonso-Herrero, Luis Colina, Santiago Garcia-Burillo, Dimitra Rigopoulou, Santiago Arribas, Michele Perna
We report the detection of extended ($>$0.5--1\,kpc) high-ionization (80\,eV) emission in four local luminous infrared galaxies observed with JWST NIRSpec. Excluding the nucleus and outflow of the Type 1 active galactic nucleus (AGN) in the sample, we find that the luminosity is well correlated with that of H recombination lines, which mainly trace star-forming clumps in these objects, and that the
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Abell 0399–Abell 0401 radio bridge spectral index: First multi-frequency detection Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-17 G. V. Pignataro, A. Bonafede, G. Bernardi, F. de Gasperin, G. Brunetti, T. Pasini, F. Vazza, N. Biava, J. M. G. H. J. de Jong, R. Cassano, A. Botteon, M. Brüggen, H. J. A. Röttgering, R. J. van Weeren, T. W. Shimwell
Aims. Recent low-frequency radio observations at 140 MHz discovered a bridge of diffuse emission with a length of 3 Mpc that connects the galaxy clusters Abell 0399 and Abell 0401. We present follow-up observations at 60 MHz to constrain the spectral index of the bridge, which has only been detected at 140 and 144 MHz so far.Methods. We analysed deep (∼18 h) LOw Frequency ARray (LOFAR) Low Band Antenna
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Magnetically driven relativistic jet in the high-redshift blazar OH 471 Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-17 S. Guo, T. An, Y. Liu, Y. Sotnikova, A. Volvach, T. Mufakharov, L. Chen, L. Cui, A. Wang, Z. Xu, Y. Zhang, W. Xu, Y. A. Kovalev, Y. Y. Kovalev, M. Kharinov, A. Erkenov, T. Semenova, L. Volvach
Context. Understanding the mechanisms that launch and shape powerful relativistic jets from supermassive black holes (SMBHs) in high-redshift active galactic nuclei (AGNs) is crucial for probing the co-evolution of SMBHs and galaxies over cosmic time.Aims. We focus on the high-redshift (z = 3.396) blazar OH 471 to explore the jet launching mechanism in the early Universe.Methods. Using multi-frequency
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The SRG/eROSITA All-Sky Survey Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-15 E. Bulbul, A. Liu, M. Kluge, X. Zhang, J. S. Sanders, Y. E. Bahar, V. Ghirardini, E. Artis, R. Seppi, C. Garrel, M. E. Ramos-Ceja, J. Comparat, F. Balzer, K. Böckmann, M. Brüggen, N. Clerc, K. Dennerl, K. Dolag, M. Freyberg, S. Grandis, D. Gruen, F. Kleinebreil, S. Krippendorf, G. Lamer, A. Merloni, K. Migkas, K. Nandra, F. Pacaud, P. Predehl, T. H. Reiprich, T. Schrabback, A. Veronica, J. Weller,
Clusters of galaxies can be used as powerful probes to study astrophysical processes on large scales, test theories of the growth of structure, and constrain cosmological models. The driving science goal of the SRG/eROSITA All-Sky Survey is to assemble a large sample of X-ray clusters with a well-defined selection function to determine the evolution of the mass function and, hence, the cosmological
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Euclid preparation Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-14 T. Castro, S. Borgani, M. Costanzi, J. Dakin, K. Dolag, A. Fumagalli, A. Ragagnin, A. Saro, A. M. C. Le Brun, N. Aghanim, A. Amara, S. Andreon, N. Auricchio, M. Baldi, S. Bardelli, C. Bodendorf, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, V. Capobianco, C. Carbone, J. Carretero, S. Casas, M. Castellano, S. Cavuoti, A. Cimatti, G. Congedo, C. J. Conselice, L. Conversi, Y. Copin, L
The Euclid photometric survey of galaxy clusters stands as a powerful cosmological tool, with the capacity to significantly propel our understanding of the Universe. Despite being subdominant to dark matter and dark energy, the baryonic component of our Universe holds substantial influence over the structure and mass of galaxy clusters. This paper presents a novel model that can be used to precisely
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The population of young low-mass stars in Trumpler 14⋆⋆⋆ Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-14 Dominika Itrich, Leonardo Testi, Giacomo Beccari, Carlo F. Manara, Megan Reiter, Thomas Preibisch, Anna F. McLeod, Giovanni Rosotti, Ralf Klessen, Sergio Molinari, Patrick Hennebelle
Massive star-forming regions are thought to be the most common birth environments in the Galaxy and the only birth places of very massive stars. Their presence in the stellar cluster alters the conditions within the cluster, impacting at the same time the evolution of other cluster members. In principle, copious amounts of ultraviolet radiation produced by massive stars can remove material from outer
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Observations of scattered light from exoplanet atmospheres Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-14 Brett M. Morris, Kevin Heng, Daniel Kitzmann
Optical phase curves of hot Jupiters can reveal global scattering properties. We implemented a Bayesian inference framework for optical phase curves with flux contributions from: reflected light from a potentially inhomogeneous atmosphere, thermal emission, ellipsoidal variations, Doppler beaming, and stellar rotation via a Gaussian process in the time domain. We probed for atmospheric homogeneity
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Structure formation with primordial black holes to alleviate early star formation tension revealed by JWST Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-14 P. E. Colazo, F. Stasyszyn, N. Padilla
Context. This Letter explores the potential role of primordial black holes (PBHs) to address cosmological tensions as the presence of more massive than expected galaxies at high redshifts, as indicated by recent James Webb Space Telescope observations.Aims. Motivated by inflation models that enhance the power at scales beyond the observable range that produce PBHs with Schechter-like mass functions
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Astrometric detection of a Neptune-mass candidate planet in the nearest M-dwarf binary system GJ65 with VLTI/GRAVITY Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-14 R. Abuter, A. Amorim, M. Benisty, J. P. Berger, H. Bonnet, G. Bourdarot, P. Bourget, W. Brandner, Y. Clénet, R. Davies, F. Delplancke-Ströbele, R. Dembet, A. Drescher, A. Eckart, F. Eisenhauer, H. Feuchtgruber, G. Finger, N. M. Förster Schreiber, P. Garcia, R. Garcia-Lopez, F. Gao, E. Gendron, R. Genzel, S. Gillessen, M. Hartl, X. Haubois, F. Haussmann, T. Henning, S. Hippler, M. Horrobin, L. Jochum
The detection of low-mass planets orbiting the nearest stars is a central stake of exoplanetary science, as they can be directly characterized much more easily than their distant counterparts. Here, we present the results of our long-term astrometric observations of the nearest binary M-dwarf Gliese 65 AB (GJ65), located at a distance of only 2.67 pc. We monitored the relative astrometry of the two
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Discovery of a hot post-AGB star in Galactic globular cluster E3 Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-08 R. Kumar, A. Moharana, S. Piridi, A. C. Pradhan, K. G. Hełminiak, N. Ikonnikova, A. Dodin, R. Szczerba, M. Giersz, D. K. Ojha, M. R. Samal
We report a new hot post-asymptotic giant branch (PAGB) star in the Galactic globular cluster (GC) E3, which is one of the first of the identified PAGB stars in a GC to show a binary signature. The star stands out as the brightest source in E3 in the Astrosat/UVIT images. We confirmed its membership with the cluster E3 using Gaia DR3 kinematics and parallax measurements. We supplemented the photometric
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Reduction of dust radial drift by turbulence in protoplanetary disks Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-06 Fabiola Antonietta Gerosa, Jérémie Bec, Héloïse Méheut, Anand Utsav Kapoor
Context. Dust particles in protoplanetary disks rotate at velocities exceeding those of the surrounding gas due to a lack of pressure support. Consequently, they experience a headwind from the gas that drives them toward the central star. Radial drift occurs on timescales much shorter than those inferred from disk observations or those required for dust to aggregate and form planets. Additionally,
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Spectroscopic evidence of a possible young stellar cluster at the Galactic Center Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-07 A. Martínez-Arranz, R. Schödel, F. Nogueras-Lara, F. Najarro, R. Castellanos, R. Fedriani
Context. The nuclear stellar disk has been the most prolific star-forming region in the Milky Way over the past ∼30 million years. Notably, the cumulative mass of the three clusters currently found in the nuclear stellar disk, the Quintuplet, the Arches, and the Nuclear clusters, amounts to just 10% of the total anticipated mass of young stars that formed in this period. This discrepancy, known as
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First image of a jet launching from a black hole accretion system: Kinematics Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-06 B. Punsly
Jets are endemic to both Galactic solar mass and extragalactic supermassive black holes. A recent 86 GHz image of M 87 shows a jet emerging from the accretion ring around a black hole, providing the first direct observational constraint on the kinematics of the jet-launching region in any black hole jetted system. The very wide (∼280 μas), highly collimated, limb-brightened cylindrical jet base is
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Unveiling very young O stars Astron. Astrophys. (IF 6.5) Pub Date : 2024-05-07 A. Roman-Lopes
Context. O-type stars are known to significantly contribute to both the dynamics and evolution of galaxies. Massive and luminous, they probably control and regulate the galaxies star formation rates. The stellar feedback generated by such cosmic beasts can strongly affect the local star formation rate, with effects in the current (and future) generations of low and intermediate mass stars, and possibly
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The galaxy group merger origin of the Cloverleaf odd radio circle system Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-30 E. Bulbul, X. Zhang, M. Kluge, M. Brüggen, B. Koribalski, A. Liu, E. Artis, Y. E. Bahar, F. Balzer, C. Garrel, V. Ghirardini, N. Malavasi, A. Merloni, K. Nandra, M. E. Ramos-Ceja, J. S. Sanders, S. Zelmer
Odd radio circles (ORCs) are a newly discovered class of extended faint radio sources of unknown origin. We report the first detection of diffuse X-ray gas at the location of a low-redshift ORC (z = 0.046) known as Cloverleaf ORC. This observation was performed with the XMM-Newton X-ray telescope. The physical extent of the diffuse X-ray emission corresponds to a region of approximately 230 kpc by
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MINDS: JWST/NIRCam imaging of the protoplanetary disk PDS 70 Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-30 V. Christiaens, M. Samland, Th. Henning, B. Portilla-Revelo, G. Perotti, E. Matthews, O. Absil, L. Decin, I. Kamp, A. Boccaletti, B. Tabone, G.-D. Marleau, E. F. van Dishoeck, M. Güdel, P.-O. Lagage, D. Barrado, A. Caratti o Garatti, A. M. Glauser, G. Olofsson, T. P. Ray, S. Scheithauer, B. Vandenbussche, L. B. F. M. Waters, A. M. Arabhavi, S. L. Grant, H. Jang, J. Kanwar, J. Schreiber, K. Schwarz
Context. Two protoplanets have recently been discovered within the PDS 70 protoplanetary disk. JWST/NIRCam offers a unique opportunity to characterize them and their birth environment at wavelengths that are difficult to access from the ground.Aims. We image the circumstellar environment of PDS 70 at 1.87 μm and 4.83 μm, assess the presence of Pa-α emission due to accretion onto the protoplanets, and
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Addition of the Local Volume sample of galaxies from the FAST HI survey Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-25 Igor D. Karachentsev, Valentina E. Karachentseva, Serafim S. Kaisin, Chuan-Peng Zhang
We report the discovery of 20 new dwarf galaxies in the Local Volume identified as optical counterparts to the Five-hundred-meter Aperture Spherical radio Telescope (FAST) All Sky HI Survey (FASHI) sources. The galaxies have a median stellar mass of 7.8 × 106 M⊙ and a median HI mass of 1.0 × 107 M⊙. Most of them are field galaxies, while three are probable members of the M 101 and M 106 groups. We
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Cosmography with supernova Refsdal through time-delay cluster lensing: Independent measurements of the Hubble constant and geometry of the Universe Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-24 C. Grillo, L. Pagano, P. Rosati, S H. Suyu
We present new measurements of the values of the Hubble constant, matter density, dark energy density, and dark energy density equation-of-state (EoS) parameters. These results have been obtained from a full strong-lensing analysis of the observed positions of 89 multiple images and 4 measured time delays of the supernova (SN) Refsdal in the Hubble Frontier Fields galaxy cluster MACS J1149.5+2223.
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The jet of BP Tau Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-25 A. V. Dodin, S. A. Potanin, M. A. Burlak, D. V. Cheryasov, N. P. Ikonnikova, S. A. Lamzin, B. S. Safonov, N. I. Shatskii, A. M. Tatarnikov
Context. A strong global magnetic field of young low-mass stars and a high accretion rate are the necessary conditions for the formation of collimated outflows (jets) from these objects. But it is still unclear whether these conditions are also sufficient.Aims. We aim to check whether BP Tau, an actively accreting young star with a strong magnetic field, has a jet.Methods. We carried out narrowband
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Imaging spectroscopy of a spectral bump in a type II radio burst⋆ Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-24 Peijin Zhang, Diana E. Morosan, Pietro Zucca, Sanna Normo, Bartosz Dabrowski, Andrzej Krankowski, Christian Vocks
Context. Observations of solar, type II radio bursts provide a unique opportunity to analyze the nonthermal electrons accelerated by coronal shocks and diagnose the plasma density distribution in the corona. However, there are very few high-frequency resolution interferometric observations of type II radio bursts that are capable of tracking these electrons.Aims. Recently, more spatially resolved high-resolution
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The Galactic bulge exploration Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-19 Z. Prudil, A. Kunder, I. Dékány, A. J. Koch-Hansen
We present a new set of period–absolute magnitude–metallicity (PMZ) relations for single-mode RR Lyrae stars calibrated for the optical GBP, V, G, GRP, near-infrared I, J, H, and Ks passbands. We compiled a large dataset (over 100 objects) of fundamental and first-overtone RR Lyrae pulsators consisting of mean intensity magnitudes, reddenings, pulsation properties, iron abundances, and parallaxes measured
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The neutrino background from non-jetted active galactic nuclei Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-19 P. Padovani, R. Gilli, E. Resconi, C. Bellenghi, F. Henningsen
Aims. We calculate the contribution to the neutrino background from the non-jetted active galactic nuclei (AGN) population following the recent IceCube association of TeV neutrinos with NGC 1068.Methods. We exploited our robust knowledge of the AGN X-ray luminosity function and evolution and converted it to the neutrino band by using NGC 1068 as a benchmark, together with a theoretically motivated
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Age of (152830) Dinkinesh I Selam constrained by secular tidal-BYORP theory Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-19 C. C. Merrill, A. R. Kubas, A. J. Meyer, S. D. Raducan
We constrained the age of the main belt binary asteroid system, (152830) Dinkinesh, through secular dynamics and assuming the secondary, Selam, is at equilibrium. We reproduced Selam’s current semi-major axis and rotation period and Dinkinesh’s current rotation period, starting from the initial conditions of the spin-up fission event. The method presented here includes the secular effects of YORP,
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Once in a blue stream Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-17 David Martínez-Delgado, Santi Roca-Fàbrega, Armando Gil de Paz, Denis Erkal, Juan Miró-Carretero, Dmitry Makarov, Karina T. Voggel, Ryan Leaman, Walter Bolchin, Sarah Pearson, Giuseppe Donatiello, Evgenii Rubtsov, Mohammad Akhlaghi, M. Angeles Gomez-Flechoso, Samane Raji, Dustin Lang, Adam Block, Jesus Gallego, Esperanza Carrasco, María Luisa García-Vargas, Jorge Iglesias-Páramo, Sergio Pascual, Nicolas
Aims. In this work we study the striking case of a narrow blue stream with a possible globular cluster-like progenitor around the NGC 7241 galaxy and its foreground dwarf companion. We want to figure out if the stream was generated by tidal interaction with NGC 7241 or if it first interacted with the foreground dwarf companion and later both fell together toward NGC 7241.Methods. We used four sets
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The central black hole in the dwarf spheroidal galaxy Leo I: Not supermassive, at most an intermediate-mass candidate Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-17 R. Pascale, C. Nipoti, F. Calura, A. Della Croce
It has recently been claimed that a surprisingly massive black hole (BH) is present in the core of the dwarf spheroidal galaxy (dSph) Leo I. This finding, based on integral field spectroscopy, challenges the typical expectation that dSphs host intermediate-mass BHs since such a BH would be classified as supermassive. Indeed, the analysis points toward Leo I harboring a BH with a lower mass limit exceeding
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Orbital obliquity of the young planet TOI-5398 b and the evolutionary history of the system⋆⋆⋆ Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-16 G. Mantovan, L. Malavolta, D. Locci, D. Polychroni, D. Turrini, A. Maggio, S. Desidera, R. Spinelli, S. Benatti, G. Piotto, A. F. Lanza, F. Marzari, A. Sozzetti, M. Damasso, D. Nardiello, L. Cabona, M. D’Arpa, G. Guilluy, L. Mancini, G. Micela, V. Nascimbeni, T. Zingales
Multi-planet systems exhibit remarkable architectural diversity. However, short-period giant planets are typically isolated. Compact systems like TOI-5398, with an outer close-orbit giant and an inner small-size planet, are rare among systems containing short-period giants. TOI-5398’s unusual architecture coupled with its young age (650 ± 150 Myr) make it a promising system for measuring the original
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Zooming in on the circumgalactic medium with GIBLE Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-16 Rahul Ramesh, Dylan Nelson, Drummond Fielding, Marcus Brüggen
We used a cosmological zoom-in simulation of a Milky Way-like galaxy to study and quantify the topology of magnetic field lines around cold gas clouds in the circumgalactic medium (CGM). This simulation is a new addition to Project GIBLE, a suite of cosmological magnetohydrodynamic simulations of galaxy formation with preferential super-Lagrangian refinement in the CGM, reaching an unprecedented CGM
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Cosmic hide and seek: The volumetric rate of X-ray quasi-periodic eruptions Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-16 R. Arcodia, A. Merloni, J. Buchner, P. Baldini, G. Ponti, A. Rau, Z. Liu, K. Nandra, M. Salvato
Multiwavelength extragalactic nuclear transients, particularly those detectable as multi-messengers, are among the primary drivers for the next-generation observatories. X-ray quasi-periodic eruptions (QPEs) are the most recent and perhaps most peculiar addition to this group. Here, we report a first estimate of the volumetric rate of QPEs based on the first four discoveries with the eROSITA X-ray
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Constraints on supermassive black hole binaries from JWST and NANOGrav Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-16 Hamsa Padmanabhan, Abraham Loeb
We use the recent statistics of dual active galactic nuclei (AGN) in the James Webb Space Telescope (JWST) data at z ∼ 3.4 to address two aspects of the feedback and evolution scenarios of supermassive black hole binaries. We find that the JWST data provide evidence for the members of a binary BH being ‘lit’ at the same time, rather than independently – a scenario which is consistent with gas-rich
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Spectroscopic observations of progenitor activity 100 days before a Type Ibn supernova⋆ Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-16 S. J. Brennan, J. Sollerman, I. Irani, S. Schulze, P. Chen, K. K. Das, K. De, C. Fransson, A. Gal-Yam, A. Gkini, K. R. Hinds, R. Lunnan, D. Perley, Y. J. Qin, R. Stein, J. Wise, L. Yan, E. A. Zimmerman, S. Anand, R. J. Bruch, R. Dekany, A. J. Drake, C. Fremling, B. Healy, V. Karambelkar, M. M. Kasliwal, M. Kong, S. R. Kulkarni, F. J. Masci, R. S. Post, J. Purdum, R. Michael Rich, A. Wold
Obtaining spectroscopic observations of the progenitors of core-collapse supernovae is often unfeasible, due to an inherent lack of knowledge as to what stars experience supernovae and when they will explode. In this Letter we present photometric and spectroscopic observations of the progenitor activity of SN 2023fyq before the He-rich progenitor explodes as a Type Ibn supernova. The progenitor of
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Determining stellar accretion rates from Paα and Brβ emission lines with JWST NIRSpec Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-10 Ciarán Rogers, Guido de Marchi, Bernhard Brandl
In this Letter, we present the first systematic spectroscopic measurements of the near-infrared (NIR) hydrogen recombination lines Paschen alpha (Paαλ = 1.875 μm) and Brackett beta (Brβλ = 2.626 μm), produced by pre-main-sequence (PMS) stars. Such stars include T Tauri and Herbig AeBe stars, located in the massive Galactic star-forming region NGC 3603. We used measurements obtained from JWST NIRSpec
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A spectacular galactic scale magnetohydrodynamic powered wind in ESO 320-G030 Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-10 M. D. Gorski, S. Aalto, S. König, C. F. Wethers, C. Yang, S. Muller, K. Onishi, M. Sato, N. Falstad, J. G. Mangum, S. T. Linden, F. Combes, S. Martín, M. Imanishi, K. Wada, L. Barcos-Muñoz, F. Stanley, S. García-Burillo, P. P. van der Werf, A. S. Evans, C. Henkel, S. Viti, N. Harada, T. Díaz-Santos, J. S. Gallagher, E. González-Alfonso
How galaxies regulate nuclear growth through gas accretion by supermassive black holes (SMBHs) is one of the most fundamental questions in galaxy evolution. One potential way to regulate nuclear growth is through a galactic wind that removes gas from the nucleus. It is unclear whether galactic winds are powered by jets, mechanical winds, radiation, or via magnetohydrodynamic (MHD) processes. Compact
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The orbital parameters of the δ Cep inner binary system determined using 2019 HARPS-N spectroscopic data Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-10 N. Nardetto, V. Hocdé, P. Kervella, A. Gallenne, W. Gieren, D. Graczyk, A. Merand, M. Rainer, J. Storm, G. Pietrzyński, B. Pilecki, E. Poretti, M. Bailleul, G. Bras, A. Afanasiev
Context. An inner companion has recently been discovered orbiting the prototype of classical Cepheids, δ Cep, whose orbital parameters are still not fully constrained.Aims. We collected new precise radial velocity measurements of δ Cep in 2019 using the HARPS-N spectrograph mounted at the Telescopio Nazionale Galileo. Using these radial velocity measurements, we aimed to improve the orbital parameters
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FAUST Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-10 G. Sabatini, L. Podio, C. Codella, Y. Watanabe, M. De Simone, E. Bianchi, C. Ceccarelli, C. J. Chandler, N. Sakai, B. Svoboda, L. Testi, Y. Aikawa, N. Balucani, M. Bouvier, P. Caselli, E. Caux, L. Chahine, S. Charnley, N. Cuello, F. Dulieu, L. Evans, D. Fedele, S. Feng, F. Fontani, T. Hama, T. Hanawa, E. Herbst, T. Hirota, A. Isella, I. Jímenez-Serra, D. Johnstone, B. Lefloch, R. Le Gal, L. Loinard
Context. The origin of the chemical diversity observed around low-mass protostars probably resides in the earliest history of these systems.Aims. We aim to investigate the impact of protostellar feedback on the chemistry and grain growth in the circumstellar medium of multiple stellar systems.Methods. In the context of the ALMA Large Program FAUST, we present high-resolution (50 au) observations of
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The dispersion of the Ep, i–Liso correlation of long gamma-ray bursts is partially due to assembling different sources Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-10 M. Maistrello, R. Maccary, C. Guidorzi, L. Amati
Context. Long gamma-ray burst (GRB) prompt emission shows a correlation between the intrinsic peak energy, Ep, i, of the time-average νFν spectrum and the isotropic-equivalent peak gamma-ray luminosity, Lp, iso, as well as the total released energy, Eiso. The same correlation is found within individual bursts, when time-resolved Ep, i and Liso are considered. These correlations are characterised by
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New constraints on Triton’s atmosphere from the 6 October 2022 stellar occultation Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-10 Ye Yuan, Chen Zhang, Fan Li, Jian Chen, Yanning Fu, Chunhai Bai, Xing Gao, Yong Wang, Tuhong Zhong, Yixing Gao, Liang Wang, Donghua Chen, Yixing Zhang, Yang Zhang, Wenpeng Xie, Shupi Zhang, Ding Liu, Jun Cao, Xiangdong Yin, Xiaojun Mo, Jing Liu, Xinru Han, Tong Liu, Yuqiang Chen, Zhendong Gao, Xiang Zeng, Guihua Niu, Xiansheng Zheng, Yuchen Lin, Peiyu Ye, Weitang Liang, Chengcheng Zhu, Zhiqiang Hu
The atmosphere of Triton was probed directly by observing a ground-based stellar occultation on 6 October 2022. This rare event yielded 23 positive light curves collected from 13 separate observation stations contributing to our campaign. The significance of this event lies in its potential to directly validate the modest pressure fluctuation on Triton, a phenomenon not definitively verified by previous
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Polarimetric differential imaging with VLT/NACO Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-09 S. de Regt, C. Ginski, M. A. Kenworthy, C. Caceres, A. Garufi, T. M. Gledhill, A. S. Hales, N. Huelamo, Á. Kóspál, M. A. Millar-Blanchaer, S. Pérez, M. R. Schreiber
Context. The observed diversity of exoplanets can possibly be traced back to the planet formation processes. Planet-disk interactions induce sub-structures in the circumstellar disk that can be revealed via scattered light observations. However, a high-contrast imaging technique such as polarimetric differential imaging (PDI) must first be applied to suppress the stellar diffraction halo.Aims. In this
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A too-many-dwarf-galaxy-satellites problem in the M 83 group Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-08 Oliver Müller, Marcel S. Pawlowski, Yves Revaz, Aku Venhola, Marina Rejkuba, Michael Hilker, Katharina Lutz
Dwarf galaxies in groups of galaxies provide excellent test cases for models of structure formation. This led to a so-called small-scale crisis, including the famous missing-satellites and too-big-to-fail problems. It was suggested that these two problems can be resolved by introducing baryonic physics to cosmological simulations. We tested the nearby grand spiral M 83 – a Milky Way sibling – to determine
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Tracking the motion of a shock along a channel in the low solar corona Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-08 J. Rigney, P. T. Gallagher, G. Ramsay, J. G. Doyle, D. M. Long, O. Stepanyuk, K. Kozarev
Context. Shock waves are excited by coronal mass ejections (CMEs) and large-scale extreme-ultraviolet (EUV) wave fronts and can result in low-frequency radio emission under certain coronal conditions.Aims. In this work, we investigate a moving source of low-frequency radio emission as a CME and an associated EUV wave front move along a channel of a lower density, magnetic field, and Alfvén speed in
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Differential optical transfer function (dOTF) broad-spectrum wavefront sensing using integral field unit spectroscopy Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-08 P. Martinez
Context. Detecting and characterizing Earth-like exoplanets is a critical scientific goal for the next generation of telescopes. However, current direct imaging instruments are hindered by evolving noncommon path aberrations (NCPAs), which lead to persistent speckles in the images. The differential optical transfer function (dOTF) is an image-based, noniterative, and model-independent wavefront sensor
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High speed stars Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-08 E. Caffau, P. Bonifacio, L. Monaco, L. Sbordone, M. Spite, P. François, P. Panuzzo, P. Sartoretti, L. Chemin, F. Thévenin, A. Mucciarelli
Context. The Gaia satellite has provided the community with three releases containing astrometrical and photometric data as well as by products, such as stellar parameters and variability indicators.Aims. By selecting in the Gaia database, one can select stars with the requested characteristics, such as high speed. At present any selection is based on available Gaia releases including a subset of the
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Advancements in the 3D shape reconstruction of Phobos: An analysis of shape models and future exploration directions★ Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-05 Min Chen, Jianguo Yan, Xianfeng Huang, Zheng Zuo, Konrad Willner, Hanyu Xiang, Jean-Pierre Barriot
Aims. Our research focuses on developing a high-precision and relatively high-resolution shape model of Phobos.Methods. We employed advanced photogrammetric techniques combined with novel computer vision methods to reconstruct the 3D shape of Phobos from nearly 900 Mars Express/SRC and Viking Orbiter images. This research also involved a comparison of the newly developed shape model with previous models
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Asymmetry in the atmosphere of the ultra-hot Jupiter WASP-76 b★★★ Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-05 O. D. S. Demangeon, P. E. Cubillos, V. Singh, T. G. Wilson, L. Carone, A. Bekkelien, A. Deline, D. Ehrenreich, P. F. L. Maxted, B.-O. Demory, T. Zingales, M. Lendl, A. Bonfanti, S. G. Sousa, A. Brandeker, Y. Alibert, R. Alonso, J. Asquier, T. Bárczy, D. Barrado Navascues, S. C. C. Barros, W. Baumjohann, M. Beck, T. Beck, W. Benz, N. Billot, F. Biondi, L. Borsato, Ch. Broeg, M. Buder, A. Collier Cameron
Context. WASP-76 b has been a recurrent subject of study since the detection of a signature in high-resolution transit spectroscopy data indicating an asymmetry between the two limbs of the planet. The existence of this asymmetric signature has been confirmed by multiple studies, but its physical origin is still under debate. In addition, it contrasts with the absence of asymmetry reported in the infrared
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Tidal frequency dependence of the Saturnian k2 Love number Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-05 V. Lainey, J. W. Dewberry, J. Fuller, N. Cooper, N. Rambaux, Q. Zhang
Context. Love numbers describe the fluid and elastic response of a body to the tidal force of another massive object. By quantifying these numbers, we can more accurately model the interiors of the celestial objects concerned.Aims. We determine Saturn’s degree-2 Love number, k2, at four different tidal forcing frequencies.Methods. To do this, we used astrometric data from the Cassini spacecraft and
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One size fits all: Insights into extrinsic thermal absorption based on the similarity of supernova remnant radio-continuum spectra Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-04 Mario G. Abadi, Gabriela Castelletti, Leonardo Supan, Namir E. Kassim, Joseph W. Lazio
Typically, integrated radio frequency continuum spectra of supernova remnants (SNRs) exhibit a power-law form due to their synchrotron emission. In numerous cases, these spectra show an exponential turnover, which has long been assumed to be due to thermal free-free absorption in the interstellar medium. We used a compilation of Galactic radio continuum SNR spectra, with and without turnovers, to constrain
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The cold molecular gas in z ≳ 6 quasar host galaxies Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-29 Melanie Kaasinen, Bram Venemans, Kevin C. Harrington, Leindert A. Boogaard, Romain A. Meyer, Eduardo Bañados, Roberto Decarli, Fabian Walter, Marcel Neeleman, Gabriela Calistro Rivera, Elisabete da Cunha
Context. Probing the molecular gas reservoirs of z ≳ 6 quasar (QSO) host galaxies is fundamental to understanding the coevolution of star formation and black hole growth in these extreme systems. Yet, there is still an inhomogeneous coverage of molecular gas tracers for z ≳ 6 QSO hosts.Aims. To measure the average excitation and mass of the molecular gas reservoirs in the brightest z > 6.5 QSO hosts
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INTEGRAL view of GRB 221009A Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-29 Volodymyr Savchenko, Pietro Ubertini, Angela Bazzano, James Craig Rodi, Elisabeth Jourdain, Jean-Pierre Roques, Antonio Martin-Carrillo, Lorraine Hanlon, Sandro Mereghetti, Andrea Tiengo, Philippe Laurent, Diego Gotz, Carlo Ferrigno, Erik Kuulkers
The gamma-ray burst GRB 221009A is among the most luminous of its kind and its proximity to Earth has made it an exceptionally rare observational event. The International Gamma-ray Astrophysics Laboratory (INTEGRAL) was in an optimal aspect position to use its all-sky instruments for recording the prompt emission and early gamma-ray afterglow in unprecedented detail. Following the initial detection
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The nature of the X-ray filaments around bow shock pulsar wind nebulae Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-28 Barbara Olmi, Elena Amato, Rino Bandiera, Pasquale Blasi
Context. We propose that the X-ray filaments emerging from selected bow shock pulsar wind nebulae are due to a charge-separated outflow of electrons and/or positrons escaping the nebula and propagating along the local Galactic magnetic field.Aims. The X-ray brightness, length, and thickness of filaments are all accounted for if a nonresonant streaming instability is excited.Methods. This is possible
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Spectroscopic searches for evolutionary orbital period changes in WR+OB binaries: The case of WR 127 (Hen 3-1772) Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-22 I. A. Shaposhnikov, A. M. Cherepashchuk, A. V. Dodin, K. A. Postnov
Aims. We aim to determine the secular evolution of the orbital period of the short-period binary system WR 127 (WN3b+O9.5V, P ≈ 9.555d).Methods. We performed new low-resolution spectroscopic observations of WR 127 with the 2.5 m CMO SAI telescope to construct the radial velocity curves of the components. Our results suggest component masses of MWRsin3(i) = 11.8 ± 1.4 M⊙ and MOsin3(i) = 17.2 ± 1.4 M⊙
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The radiative and dynamical impact of clouds in the atmosphere of the hot Jupiter WASP-43 b Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-22 L. Teinturier, B. Charnay, A. Spiga, B. Bézard, J. Leconte, A. Mechineau, E. Ducrot, E. Millour, N. Clément
Context. Hot Jupiters are tidally locked gaseous exoplanets that exhibit large day-night temperature contrasts. Their cooler nightsides are thought to host clouds, as has been suggested by numerous observations. However, the exact nature of these clouds, their spatial distribution, and their impact on atmospheric dynamics, thermal structure, and spectra is still unclear.Aims. We investigate the atmosphere
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Radio outburst from a massive (proto)star Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-20 R. Cesaroni, L. Moscadelli, A. Caratti o Garatti, J. Eislöffel, R. Fedriani, R. Neri, T. Ray, A. Sanna, B. Stecklum
We report new Very Large Array high-resolution observations of the radio jet from the outbursting high-mass star S255IR NIRS 3. The images at 6, 10, and 22.2 GHz confirm the existence of a new lobe emerging to the SW and expanding at a mean speed of ∼285 km s−1, about half as fast as the NE lobe. The new data allow us to reproduce both the morphology and the continuum spectrum of the two lobes with
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Spatially resolving the AGB star V3 in the metal-poor globular cluster 47 Tuc with VLTI/GRAVITY⋆ Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-18 K. Ohnaka, G. Weigelt, K.-H. Hofmann, D. Schertl
Context. Mass loss at the asymptotic giant branch (AGB) plays an important role not only in the final fates of stars, but also in the chemical evolution of galaxies. Nevertheless, the metallicity effects on AGB mass loss are not yet fully understood.Aims. We present spatially resolved observations of an AGB star, V3, in the metal-poor globular cluster 47 Tuc (NGC 104).Methods. The AGB star 47 Tuc V3
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Gaia’s brightest very metal-poor (VMP) stars Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-15 Akshara Viswanathan, Else Starkenburg, Tadafumi Matsuno, Kim A. Venn, Nicolas F. Martin, Nicolas Longeard, Anke Ardern-Arentsen, Raymond G. Carlberg, Sébastien Fabbro, Georges Kordopatis, Martin Montelius, Federico Sestito, Zhen Yuan
Context. Gaia DR3 has offered the scientific community a remarkable dataset of approximately one million spectra acquired with the radial velocity spectrometer (RVS) in the calcium II triplet region, which is well suited to identify very metal-poor (VMP) stars. However, over 40% of these spectra have no released parameters by Gaia’s GSP-Spec pipeline in the domain of VMP stars, whereas VMP stars are