C. Agliozzo
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View article: LBV phenomenon and binarity: The environment of HR Car
LBV phenomenon and binarity: The environment of HR Car Open
Luminous blue variable stars (LBVs) are of great interest in massive-star evolution as they experience very high mass-loss episodes within short periods of time. HR Car is a famous member of this class in the Galaxy. It has a large circums…
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: The ASKAP-EMU Early Science Project: 888 MHz radio continuum survey of the Large Magellanic Cloud
The ASKAP-EMU Early Science Project: 888 MHz radio continuum survey of the Large Magellanic Cloud Open
We present an analysis of a new 120 deg2 radio continuum image of the Large Magellanic Cloud (LMC) at 888 MHz with a bandwidth of 288 MHz and beam size of 13${_{.}^{\prime\prime}}$9 × 12${_{.}^{\prime\prime}}$1 from the Australian Square K…
View article: Luminous Blue Variable stars as dust factories at sub-solar metallicities
Luminous Blue Variable stars as dust factories at sub-solar metallicities Open
Luminous Blue Variable stars are blue supergiants that undergo instabilities and experience outbursts with high mass-loss rates. An extreme example is eta Car, that in the XIX century ejected more than 40 solar masses at rates higher than …
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: Luminous Blue Variable stars as dust factories at sub-solar metallicities
Luminous Blue Variable stars as dust factories at sub-solar metallicities Open
Luminous Blue Variable stars (LBVs) are evolved massive stars that undergo instabilities and experience outbursts with very high mass-loss rates. An extreme example in our Galaxy is eta Carinae, that in the XIX century ejected up to 40 sol…
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: 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: The ESO Summer Research Programme 2019
The ESO Summer Research Programme 2019 Open
For the first time ever, a summer research programme was organised at ESO Garching. Seven students, enrolled in universities all around the world, were selected from more than 300 applicants. They each spent six weeks from June to August 2…
View article: Signatures of an eruptive phase before the explosion of the peculiar core-collapse SN 2013gc
Signatures of an eruptive phase before the explosion of the peculiar core-collapse SN 2013gc Open
We present photometric and spectroscopic analysis of the peculiar\ncore-collapse SN 2013gc, spanning seven years of observations. The light curve\nshows an early maximum followed by a fast decline and a phase of almost\nconstant luminosity…
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…
View article: Detection of α Centauri at radio wavelengths: chromospheric emission and search for star–planet interaction
Detection of α Centauri at radio wavelengths: chromospheric emission and search for star–planet interaction Open
At radio wavelengths, solar-type stars emit thermal free-free and\ngyroresonance, gyrosynchrotron, and impulsive coherent emission. Thermal\nfree-free emission originates at layers where the optical depth is close to\nunit, while high brig…
View article: The lowest metallicity type II supernova from the highest mass red-supergiant progenitor
The lowest metallicity type II supernova from the highest mass red-supergiant progenitor Open
Red supergiants have been confirmed as the progenitor stars of the majority of hydrogen-rich type II supernovae. However, while such stars are observed with masses >25M$_\odot$, detections of >18M$_\odot$ progenitors remain elusive. Red su…
View article: A combined multiwavelength VLA/ALMA/Chandra study unveils the complex magnetosphere of the B-type star HR5907
A combined multiwavelength VLA/ALMA/Chandra study unveils the complex magnetosphere of the B-type star HR5907 Open
We present new radio/millimeter measurements of the hot magnetic star HR5907\nobtained with the VLA and ALMA interferometers. We find that HR5907 is the most\nradio luminous early type star in the cm-mm band among those presently known.\nI…
View article: SCORPIO – II. Spectral indices of weak Galactic radio sources
SCORPIO – II. Spectral indices of weak Galactic radio sources Open
In the next few years the classification of radio sources observed by the\nlarge surveys will be a challenging problem, and spectral index is a powerful\ntool for addressing it. Here we present an algorithm to estimate the spectral\nindex …
View article: The Luminous Blue Variable RMC 127 as Seen with ALMA and ATCA
The Luminous Blue Variable RMC 127 as Seen with ALMA and ATCA Open
We present ALMA and ATCA observations of the luminous blue variable RMC 127. The radio maps show for the first time the core of the nebula and evidence that the nebula is strongly asymmetric with a Z-pattern shape. Hints of this morphology…
View article: Exploring the multifaceted circumstellar environment of the luminous blue variable HR Carinae
Exploring the multifaceted circumstellar environment of the luminous blue variable HR Carinae Open
We present a multi-wavelength study of the Galactic Luminous Blue Variable HR Carinae, based on new high resolution mid-infrared (IR) and radio images obtained with the Very Large Telescope (VLT) and the Australia Telescope Compact Array (…
View article: New ATCA, ALMA and VISIR observations of the candidate LBV SK -67 266 (S61): the nebular mass from modelling 3D density distributions
New ATCA, ALMA and VISIR observations of the candidate LBV SK -67 266 (S61): the nebular mass from modelling 3D density distributions Open
We present new observations of the nebula around the Magellanic candidate Luminous Blue Variable S61. These comprise high-resolution data acquired with the Australia Telescope Compact Array (ATCA), the Atacama Large Millimetre/Submillimetr…
View article: The mass-loss before the end: two luminous blue variables with a collimated stellar wind
The mass-loss before the end: two luminous blue variables with a collimated stellar wind Open
We gathered a multiwavelength dataset of two well-known LBVs. We found a complex mass-loss, with evidence of variability, such as has been seen previously. In addition, our data reveal signatures of collimated stellar winds. We propose a n…
View article: High-resolution Very Large Array observations of 18 MIPSGAL bubbles
High-resolution Very Large Array observations of 18 MIPSGAL bubbles Open
We present radio observations of 18 MIPSGAL bubbles performed at 5 GHz (6 cm) with the Karl G. Jansky Very Large Array in configuration B and BnA. The observations were aimed at understanding what kind of information high-resolution and hi…