J. R. D. Lépine
YOU?
Author Swipe
View article: Discovery of 178 Open Clusters with Gaia DR3
Discovery of 178 Open Clusters with Gaia DR3 Open
We present 178 new open cluster candidates identified through the application of the HDBSCAN clustering algorithm to astrometric data from the Gaia DR3 catalog. The analysis was performed over 5770 1 deg 2 fields centered on OB stars, whic…
View article: Design of the tertiary optical system for the Large Latin American Millimeter Array radio telescope
Design of the tertiary optical system for the Large Latin American Millimeter Array radio telescope Open
Many modern radio telescopes employ an observational strategy that involves\nmaximizing the use of their available spaces (cabins), outfitting them with\nvarious receivers at different frequencies to detect incoming signals from the\nsky s…
View article: LLAMA Millimeter and Submillimeter Observatory. Update on its Science Opportunities
LLAMA Millimeter and Submillimeter Observatory. Update on its Science Opportunities Open
The Large Latin American Millimeter Array (LLAMA for short) is a joint scientific and technological undertaking of Argentina and Brazil whose goal is to install and to operate an observing facility capable of performing observations of the…
View article: Editorial: Galactic Dynamics in the Solar Neighborhood
Editorial: Galactic Dynamics in the Solar Neighborhood Open
EDITORIAL article Front. Astron. Space Sci., 25 March 2022Sec. Fundamental Astronomy https://doi.org/10.3389/fspas.2022.855001
View article: A Spectral Survey of CH<sub>3</sub>CCH in the Hot Molecular Core G331.512-0.103
A Spectral Survey of CH<sub>3</sub>CCH in the Hot Molecular Core G331.512-0.103 Open
A spectral survey of methyl acetylene (CH 3 CCH) was conducted toward the hot molecular core/outflow G331.512-0.103. Our APEX observations allowed the detection of 41 uncontaminated rotational lines of CH 3 CCH in the frequency range betwe…
View article: Superconducting Sub-THz Receivers for Space and Ground-Based Radio Astronomy
Superconducting Sub-THz Receivers for Space and Ground-Based Radio Astronomy Open
The developments in the field of low-noise receiving systems in the sub-THz range, performed at the Kotelnikov Institute of Radio Engineering of the Russian Academy of Sciences in recent years and aimed at the creation of receivers with qu…
View article: HCN/HNC chemistry in shocks: a study of L1157-B1 with ASAI
HCN/HNC chemistry in shocks: a study of L1157-B1 with ASAI Open
Hydrogen cyanide (HCN) and its isomer hydrogen isocyanide (HNC) play an important role in molecular cloud chemistry and the formation of more complex molecules. We investigate here the impact of protostellar shocks on the HCN and HNC abund…
View article: The Distribution of Open Clusters in the Galaxy
The Distribution of Open Clusters in the Galaxy Open
In this work we explore the new catalog of galactic open clusters that became available recently, containing 1,750 clusters that have been re-analyzed using the Gaia DR2 catalog to determine the stellar memberships. We used the young open …
View article: Isocyanic acid (HNCO) in the hot molecular core G331.512-0.103: observations and chemical modelling
Isocyanic acid (HNCO) in the hot molecular core G331.512-0.103: observations and chemical modelling Open
Isocyanic acid (HNCO) is a simple molecule with a potential to form prebiotic and complex organic species. Using a spectral survey collected with the Atacama Pathfinder EXperiment, in this work we report the detection of 42 transitions of …
View article: Dynamics of the Spiral-Arm Corotation and Its Observable Footprints in the Solar Neighborhood
Dynamics of the Spiral-Arm Corotation and Its Observable Footprints in the Solar Neighborhood Open
This article discusses the effects of the spiral-arm corotation on the stellar dynamics in the Solar Neighborhood (SN). All our results presented here rely on: (1) observational evidence that the Sun lies near the corotation circle, where …
View article: The distribution of open clusters in the Galaxy
The distribution of open clusters in the Galaxy Open
In this work we explore the new catalog of galactic open clusters that became available recently, containing 1750 clusters that have been re-analysed using the Gaia DR2 catalog to determine the stellar memberships. We used the young open c…
View article: Dynamics of the spiral-arm corotation and its observable footprints in\n the Solar Neighborhood
Dynamics of the spiral-arm corotation and its observable footprints in\n the Solar Neighborhood Open
This article discusses the effects of the spiral-arm corotation on the\nstellar dynamics in the Solar Neighborhood (SN). All our results presented here\nrely on: 1) observational evidence that the Sun lies near the corotation\ncircle, wher…
View article: Updated parameters of 1743 open clusters based on <i>Gaia</i> DR2
Updated parameters of 1743 open clusters based on <i>Gaia</i> DR2 Open
In this study, we follow up our recent paper (Monteiro et al. 2020) and present a homogeneous sample of fundamental parameters of open clusters in our Galaxy, entirely based on Gaia DR2 data. We used published membership probability of the…
View article: The LLAMA Brazilian-Argentinian radiotelescope project: progress in Brazil and BRICS collaboration
The LLAMA Brazilian-Argentinian radiotelescope project: progress in Brazil and BRICS collaboration Open
We present briefly the LLAMA sub-mm radiotelescope, a joint project of Argentina and Brazil, being mounted in the Andes, Argentina, at 4800 m altitude. Here we focus on the activities that are going on mostly under the responsibility of Br…
View article: Superconducting Terahertz Receivers for Space and Ground-based Radio Astronomy
Superconducting Terahertz Receivers for Space and Ground-based Radio Astronomy Open
The main task of the RFBR_BRICS project 'Superconducting terahertz receivers for space and ground radio astronomy' is the development of terahertz technologies and the creation of superconductor-insulator-superconductor (SIS) receivers wit…
View article: Fundamental parameters for 45 open clusters with Gaia DR2, an improved extinction correction and a metallicity gradient prior
Fundamental parameters for 45 open clusters with Gaia DR2, an improved extinction correction and a metallicity gradient prior Open
Reliable fundamental parameters of open clusters (OCs) such as distance, age, and extinction are key to our understanding of Galactic structure and stellar evolution. In this work, we use Gaia Data Release 2 (DR2) to investigate 45 OCs lis…
View article: Sulphur-bearing and complex organic molecules in an infrared cold core
Sulphur-bearing and complex organic molecules in an infrared cold core Open
Since the start of ALMA (Atacama Large Millimeter Array) observatory operation, new and important chemistry of infrared cold core was revealed. Molecular transitions at millimetre range are being used to identify and to characterize these …
View article: Elemental abundances in the centre of the Galactic nuclear disc
Elemental abundances in the centre of the Galactic nuclear disc Open
We have made the first attempt to derive the chemical properties of the Galactic disc at its very central part using high-resolution infrared spectroscopic observations of four classical Cepheids. These stars are located at Galactocentric …
View article: Cyanoacetylene in the outflow/hot molecular core G331.512−0.103
Cyanoacetylene in the outflow/hot molecular core G331.512−0.103 Open
Using APEX-1 and APEX-2 observations, we have detected and studied the rotational lines of the HC3N molecule (cyanoacetylene) in the powerful outflow/hot molecular core G331.512−0.103. We identified 31 rotational lines at J levels between …
View article: Moving Groups as the Origin of the Vertical Phase Space Spiral in the Solar Neighborhood
Moving Groups as the Origin of the Vertical Phase Space Spiral in the Solar Neighborhood Open
Using Gaia data release 2 (DR2), we analyzed the distribution of stars in the close vicinity of the Sun in the full 3D position–velocity space. We have found no evidence of incomplete phase mixing in the vertical direction of the disk, whi…
View article: The spiral pattern rotation speed of the Galaxy and the corotation radius with Gaia DR2
The spiral pattern rotation speed of the Galaxy and the corotation radius with Gaia DR2 Open
In this work we revisit the issue of the rotation speed of the spiral arms\nand the location of the corotation radius of our Galaxy. This research was\nperformed using homogeneous data set of young open clusters (age < 50 Myr)\ndetermined …
View article: The moving groups as the origin of the vertical phase space spiral
The moving groups as the origin of the vertical phase space spiral Open
Using the Gaia data release 2 (DR2), we analyzed the distribution of stars in the close vicinity of the Sun in the full 3D position-velocity space. We have found no evidence of incomplete phase mixing in the vertical direction of the disk,…
View article: Astrometric and photometric study of Dias 4, Dias 6, and other five open clusters using ground-based and Gaia DR2 data
Astrometric and photometric study of Dias 4, Dias 6, and other five open clusters using ground-based and Gaia DR2 data Open
We present a study of 7 southern open clusters based on UBVRI CCD photomety (Johnsons-Cousins system) and Gaia DR2 data. Dias 4, Dias 6 and four other clusters had UBVRI photometric observations determined for the first time. From the obse…
View article: On the Stellar Velocity Distribution in the Solar Neighborhood in Light of Gaia DR2
On the Stellar Velocity Distribution in the Solar Neighborhood in Light of Gaia DR2 Open
The aim of this Letter is to contribute to the understanding of the stellar velocity distribution in the solar neighborhood (SN). We propose that the structures on the U – V planes, known as the moving groups, can be mainly explained by th…
View article: Combined dynamical effects of the bar and spiral arms in a Galaxy model. Application to the solar neighbourhood
Combined dynamical effects of the bar and spiral arms in a Galaxy model. Application to the solar neighbourhood Open
Context. Observational data indicate that the Milky Way is a barred spiral galaxy. Computation facilities and availability of data from Galactic surveys stimulate the appearance of models of the Galactic structure, however further efforts …
View article: Herschel Planetary Nebula Survey (HerPlaNS)★: hydrogen recombination laser lines in Mz 3
Herschel Planetary Nebula Survey (HerPlaNS)★: hydrogen recombination laser lines in Mz 3 Open
The bipolar nebula Menzel 3 (Mz 3) was observed as part of the\n\\textit{Herschel} Planetary Nebula Survey (\\textit{HerPlaNS}), which used the\nPACS and SPIRE instruments aboard the \\textit{Herschel Space Observatory} to\nstudy a sample …
View article: A search for cyanopolyynes in L1157-B1
A search for cyanopolyynes in L1157-B1 Open
International audience
View article: The Dynamical Origin of the Local Arm and the Sun's Trapped Orbit
The Dynamical Origin of the Local Arm and the Sun's Trapped Orbit Open
The Local Arm of the Milky Way, a short spiral feature near the Sun whose existence has been known for decades, was recently observed in detail with different tracers. Many efforts have been dedicated to elaborate plausible hypotheses conc…
View article: Modelling resonances and orbital chaos in disk galaxies
Modelling resonances and orbital chaos in disk galaxies Open
Context: Resonances in the stellar orbital motion under perturbations from\nspiral arms structure play an important role in the evolution of the disks of\nspiral galaxies. The epicyclic approximation allows the determination of the\ncorres…