C. S. Buemi
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View article: Twenty years of blazar monitoring with the INAF radio telescopes
Twenty years of blazar monitoring with the INAF radio telescopes Open
Context . The extreme variability of blazars, in both timescale and amplitude, is generally explained as the effect of a relativistic jet closely aligned with the observer’s line of sight. Via causality arguments, variability characteristi…
View article: Twenty years of blazar monitoring with the INAF radio telescopes
Twenty years of blazar monitoring with the INAF radio telescopes Open
The extreme variability of blazars, in both timescale and amplitude, is generally explained as the effect of a relativistic jet closely aligned to the observer's line-of-sight. Due to causality arguments, variability characteristics transl…
View article: Broadband radio study of the supernova remnant Kes 73
Broadband radio study of the supernova remnant Kes 73 Open
Context . Strong shocks occurring in supernova remnants (SNRs), and their interaction with an often anisotropic surrounding medium, make SNRs ideal laboratories for studying the production and acceleration of cosmic rays (CRs). Due to thei…
View article: X-ray and radio data obtained by <i>XMM-Newton</i> and VLA constrain the stellar wind of the magnetic quasi-Wolf-Rayet star in HD45166
X-ray and radio data obtained by <i>XMM-Newton</i> and VLA constrain the stellar wind of the magnetic quasi-Wolf-Rayet star in HD45166 Open
Context. Recently, a powerful magnetic field was discovered in the hot helium star classified as a quasi-Wolf-Rayet (qWR) star (∼2 M ⊙ ), in the HD 45166 system. Upon its explosion as a core-collapse supernova, it is expected to produce a …
View article: The SARAO MeerKAT Galactic Plane Survey extended source catalogue
The SARAO MeerKAT Galactic Plane Survey extended source catalogue Open
We present a catalogue of extended radio sources from the SARAO MeerKAT Galactic Plane Survey (SMGPS). Compiled from 56 survey tiles and covering approximately 500 deg 2 across the first, third, and fourth Galactic quadrants, the catalogue…
View article: The MeerKAT view on Galactic supernova remnants
The MeerKAT view on Galactic supernova remnants Open
Context. The integrated radio spectrum of supernova remnants (SNRs) and the spatial variation of the spectral indices across these extended sources are powerful tools for studying the shocks and particle acceleration processes occurring in…
View article: Discovery of Perun (G329.9−0.5): a new, young, Galactic SNR
Discovery of Perun (G329.9−0.5): a new, young, Galactic SNR Open
We present the discovery of possibly the youngest Galactic supernova remnant (SNR) with associated pulsar-wind nebula (PWN), which we name Perun (G329.9−0.5). Perun was serendipitously discovered in the Australian Square Kilometre Array Pa…
View article: Sifting the debris: Patterns in the SNR population with unsupervised ML methods
Sifting the debris: Patterns in the SNR population with unsupervised ML methods Open
Supernova remnants (SNRs) carry vast amounts of mechanical and radiative energy that heavily influence the structural, dynamical, and chemical evolution of galaxies. To this day, more than 300 SNRs have been discovered in the Milky Way, ex…
View article: MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre
MeerKAT reveals a ghostly thermal radio ring towards the Galactic Centre Open
We present the serendipitous discovery of a new radio-continuum ring-like object nicknamed Kýklos (J1802–3353), with MeerKAT UHF and L -band observations. The radio ring, which resembles the recently discovered odd radio circles (ORCs), ha…
View article: Self-supervised contrastive learning of radio data for source detection, classification and peculiar object discovery
Self-supervised contrastive learning of radio data for source detection, classification and peculiar object discovery Open
New advancements in radio data post-processing are underway within the SKA precursor community, aiming to facilitate the extraction of scientific results from survey images through a semi-automated approach. Several of these developments l…
View article: The distance to CRL 618 through its radio expansion parallax
The distance to CRL 618 through its radio expansion parallax Open
CRL 618 is a post-AGB star that has started to ionize its ejecta. Its central HII region has been observed over the last 40 years and has steadily increased in flux density at radio wavelengths. In this paper, we present data that we obtai…
View article: The distance to CRL 618 through its radio expansion parallax
The distance to CRL 618 through its radio expansion parallax Open
CRL 618 is a post-Asymptotic Giant Branch star that has started to ionize its ejecta. Its central H ii region has been observed over the last 40 yr and has steadily increased in flux density at radio wavelengths. In this paper, we present …
View article: Classification of compact radio sources in the Galactic plane with supervised machine learning
Classification of compact radio sources in the Galactic plane with supervised machine learning Open
Generation of science-ready data from processed data products is one of the major challenges in next-generation radio continuum surveys with the Square Kilometre Array (SKA) and its precursors, due to the expected data volume and the need …
View article: The SARAO MeerKAT 1.3 GHz Galactic Plane Survey
The SARAO MeerKAT 1.3 GHz Galactic Plane Survey Open
We present the SARAO MeerKAT Galactic Plane Survey (SMGPS), a 1.3 GHz continuum survey of almost half of the Galactic Plane (251°$\le l \le$ 358°and 2°$\le l \le$ 61°at $|b| \le 1.5°$). SMGPS is the largest, most sensitive and highest angu…
View article: The rich molecular environment of the luminous blue variable star AFGL 2298
The rich molecular environment of the luminous blue variable star AFGL 2298 Open
Context. Luminous blue variable (LBV) stars represent a short-lived stage in the late evolution of the most massive stars. Highly unstable, LBVs exhibit dense stellar winds and episodic eruptions that produce complex circumstellar nebulae,…
View article: The rich molecular environment of the luminous blue variable star AFGL 2298
The rich molecular environment of the luminous blue variable star AFGL 2298 Open
We investigated the molecular environment of AFGL 2298, an obscured Galactic Luminous blue variable (LBV) star which hosts a highly structured circumstellar environment with hints of multiple mass-loss events in the last few $10^4$ a. We p…
View article: Star-Planet Interaction at radio wavelengths in YZ Ceti: Inferring planetary magnetic field
Star-Planet Interaction at radio wavelengths in YZ Ceti: Inferring planetary magnetic field Open
In exoplanetary systems, the interaction between the central star and the planet can trigger Auroral Radio Emission (ARE), due to the Electron Cyclotron Maser mechanism. The high brightness temperature of this emission makes it visible at …
View article: First Detection of Silicon-bearing Molecules in η Car
First Detection of Silicon-bearing Molecules in η Car Open
We present ALMA band 6 observations of the luminous blue variable η Car obtained within the ALMAGAL program. We report SiO J = 5 → 4, SiS J = 12 → 11, and SiN N = 5 → 4 emission in the equatorial region of the Homunculus nebula, constituti…
View article: Discovery and origin of the radio emission from the multiple stellar system KQVel
Discovery and origin of the radio emission from the multiple stellar system KQVel Open
KQVel is a binary system composed of a slowly rotating magnetic Ap star with a companion of unknown nature. In this paper, we report the detection of its radio emission. We conducted a multi-frequency radio campaign using the ATCA interfer…
View article: Towards coordinated site monitoring and common strategies for mitigation of Radio Frequency Interference at the Italian radio telescopes
Towards coordinated site monitoring and common strategies for mitigation of Radio Frequency Interference at the Italian radio telescopes Open
We present a project to implement a national common strategy for the mitigation of the steadily deteriorating Radio Frequency Interference (RFI) situation at the Italian radio telescopes. The project involves the Medicina, Noto, and Sardin…
View article: A scaling relationship for non-thermal radio emission from ordered magnetospheres: from the top of the main sequence to planets
A scaling relationship for non-thermal radio emission from ordered magnetospheres: from the top of the main sequence to planets Open
In this paper, we present the analysis of incoherent non-thermal radio emission from a sample of hot magnetic stars, ranging from early-B to early-A spectral type. Spanning a wide range of stellar parameters and wind properties, these star…
View article: A warm molecular ring in AG Car: composing the mass-loss puzzle
A warm molecular ring in AG Car: composing the mass-loss puzzle Open
We present APEX observations of CO J = 3 → 2 and ALMA observations of CO J = 2 → 1, 13CO J = 2 → 1, and continuum towards the Galactic luminous blue variable AG Car. These new observations reveal the presence of a ring-like molecular struc…
View article: The auroral radio emission of the magnetic B-type star ρ OphC
The auroral radio emission of the magnetic B-type star ρ OphC Open
The non-thermal radio emission of main-sequence early-type stars is a signature of stellar magnetism. We present multiwavelength (1.6–16.7 GHz) ATCA measurements of the early-type magnetic star ρ OphC, which is a flat-spectrum non-thermal …
View article: Evidence for radio and X-ray auroral emissions from the magnetic B-type star ρ Oph A
Evidence for radio and X-ray auroral emissions from the magnetic B-type star ρ Oph A Open
We present new ATCA multiwavelength radio measurements (range 2.1–21.2 GHz) of the early-type magnetic star ρ Oph A, performed in 2019 March during three different observing sessions. These new ATCA observations evidence a clear rotational…
View article: Study of the Galactic radio sources in the SCORPIO survey resolved by ATCA at 2.1 GHz
Study of the Galactic radio sources in the SCORPIO survey resolved by ATCA at 2.1 GHz Open
We present a catalogue of a large sample of extended radio sources in the SCORPIO field, observed and resolved by the Australia Telescope Compact Array. SCORPIO, a pathfinder project for addressing the early operations of the Australia SKA…
View article: C<sub>2</sub>O and C<sub>3</sub>O in low-mass star-forming regions
C<sub>2</sub>O and C<sub>3</sub>O in low-mass star-forming regions Open
Context. C 2 O and C 3 O belong to the carbon chain oxides family. Both molecules have been detected in the gas phase towards several star-forming regions, and to explain the observed abundances, ion-molecule gas-phase reactions have been …
View article: A massive nebula around the luminous blue variable star RMC 143 revealed by ALMA
A massive nebula around the luminous blue variable star RMC 143 revealed by ALMA Open
The luminous blue variable (LBV) RMC 143 is located in the outskirts of the 30 Doradus complex, a region rich with interstellar material and hot luminous stars. We report the 3σ sub-millimetre detection of its circumstellar nebula with ALM…
View article: Caesar source finder: Recent developments and testing
Caesar source finder: Recent developments and testing Open
A new era in radio astronomy will begin with the upcoming large-scale surveys planned at the Australian Square Kilometre Array Pathfinder (ASKAP). ASKAP started its Early Science programme in October 2017 and several target fields were obs…
View article: C_2_O and C_3_O in low-mass star-forming regions
C_2_O and C_3_O in low-mass star-forming regions Open
Data reported in Figure 1 correspond to newly detected C2O and lines towards: L1544 (panels A, B, C, D, E and F); L1498 (panels G and H); and Elias 18 (panels I and J). Each panel reports the molecule and its transition. The detection repo…
View article: The polarization mode of the auroral radio emission from the early-type star HD 142301
The polarization mode of the auroral radio emission from the early-type star HD 142301 Open
We report the detection of the auroral radio emission from the early-type magnetic star HD 142301. New VLA observations of HD 142301 detected highly polarized amplified emission occurring at fixed stellar orientations. The coherent emissio…