301 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Ural Federal UniversityRU19 papers
- Max Planck Institute for Extraterrestrial PhysicsDE17 papers
- Arcetri Astrophysical ObservatoryIT7 papers
- Centre National de la Recherche ScientifiqueFR6 papers
- European Southern ObservatoryCL6 papers
- Lomonosov Moscow State UniversityRU5 papers
- Nicolaus Copernicus UniversityPL5 papers
- RIKENJP5 papers
- University of WarwickGB5 papers
- Centro de AstrobiologíaES4 papers
- Chalmers University of TechnologySE4 papers
- Institut de Radioastronomie MillimétriqueFR4 papers
37 papers · 1 filter
The role of supernova remnants for the emergence of pre-biotic chemistry in molecular clouds
Giuliana Cosentino, Izaskun Jiménez-Serra, Laura Colzi +11
There is growing evidence that the Sun might have formed within a nebula impacted by at least one SNR. In this scenario, ejecta and shocks from SNRs may have provided the elements…
Effects of grain temperature distribution on organic protostellar envelope chemistry
Juris Kalvans, Juris Freimanis
Context. Dust grains in circumstellar envelopes are likely to have a spread-out temperature distribution. Aims. To investigate how trends in temperature distribution between small…
A multigrain-multilayer astrochemical model with variable desorption energy for surface species
Juris Kalvāns, Aija Kalniņa, Kristaps Veitners
Context. Interstellar surface chemistry is a complex process that occurs in icy layers accumulated onto grains of different sizes. Efficiency of surface processes often depends on…
Milliarcsecond structure and variability of methanol maser emission in three high-mass protostars
A Aberfelds, A Bartkiewicz, M Szymczak +5
{The variability study of 6.7\,GHz methanol masers has become a useful way to improve our understanding of the physical conditions in high-mass star-forming regions.} {Based on the…
Temperature Spectra of Interstellar Dust Grains Heated by Cosmic Rays. III. Mixed Composition Grains
Juris Kalvans, Juris Roberts Kalnin
Icy grains in the interstellar medium and star-formation regions consist of a variety of materials. Such composite grains interact differently with cosmic-ray (CR) particles compar…
Icy molecule desorption in interstellar grain collisions
Juris Kalvāns, Kedron Silsbee
Observations of gaseous complex organic molecules (COMs) in cold starless and prestellar cloud cores require efficient desorption of the COMs and their parent species from icy mant…
The methanol emission in the A line series as a tracer of specific physical conditions in high-mass star-forming regions
Svetlana V. Salii, Igor I. Zinchenko, Sheng-Yuan Liu +3
We present results of the investigations of the properties of the methanol A line series motivated by the recent serendipitous detection of the maser emission in…
Sub-arcsecond imaging with the International LOFAR Telescope: II. Completion of the LOFAR Long-Baseline Calibrator Survey
Neal Jackson, Shruti Badole, John Morgan +69
The Low-Frequency Array (LOFAR) Long-Baseline Calibrator Survey (LBCS) was conducted between 2014 and 2019 in order to obtain a set of suitable calibrators for the LOFAR array. In…
New ex-OH maser detections in the northern celestial hemisphere
O. Patoka, O. Antyufeyev, I. Shmeld +5
Aims.Molecular masers, including methanol and hydroxyl masers, and in particular the ones in excited rotational states (ex-OHmasers), are one of the most informative tools for stud…
A New Method for Simulating Photoprocesses in Astrochemical Models
Ella Mullikin, Hannah Anderson, Natalie O'Hern +8
We propose a new model for treating solid-phase photoprocesses in interstellar ice analogues. In this approach, photoionization and photoexcitation are included in more detail, and…
The connection between warm carbon chain chemistry and interstellar irradiation of star-forming cores
Juris Kalvans
Some observations of warm carbon chain chemistry (WCCC) cores indicate that they are often located near the edges of molecular clouds. This finding may suggest that WCCC is promote…
Water and Methanol Ice in L1544
Miwa Goto, A. I. Vasyunin, B. M. Giuliano +4
Methanol and complex organic molecules have been found in cold starless cores, where a standard warm-up scenario would not work because of the absence of heat sources. A recent che…
Cosmic ray tracks in astrophysical ices: Modeling with the Geant4-DNA Monte Carlo Toolkit
Christopher N. Shingledecker, Sebastien Incerti, Alexei Ivlev +4
Cosmic rays are ubiquitous in interstellar environments, and their bombardment of dust-grain ice mantles is a possible driver for the formation of complex, even prebiotic molecules…
Impact of PAH photodissociation on the formation of small hydrocarbons in the Orion Bar and the Horsehead PDRs
M. S. Murga, M. S. Kirsanova, A. I. Vasyunin +1
We study whether polycyclic aromatic hydrocarbons (PAHs) can be a weighty source of small hydrocarbons in photo-dissociation regions (PDRs). We modeled the evolution of 20 specific…
Evaporative cooling of icy interstellar grains II. Key parameters
Juris Kalvāns, Juris Roberts Kalnin
Context. Evaporative (sublimation) cooling of icy interstellar grains occurs when the grains have been suddenly heated by a cosmic-ray (CR) particle or other process. It results in…
Methanol formation chemistry with revised reactions scheme
V. A. Sokolova
The aim of the presented work is to analyze the impact of experimentally evaluated reactions of hydrogen abstraction on surfaces of interstellar grains on the chemical evolution of…
Optical properties and dust temperatures in clumpy diffuse medium
Andrei B. Ostrovskii, S. Yu. Parfenov, A. I. Vasyunin +2
In this study, we explore the impact of inhomogeneities in the spatial distribution of interstellar dust on spatial scales of au caused by ion shadowing forces on the optica…
Seeds of Life in Space (SOLIS).VII. Discovery of a cold dense methanol blob toward the L1521F VeLLO system
C. Favre, C. Vastel, I. Jimenez-Serra +40
The SOLIS (Seeds Of Life In Space) IRAM/NOEMA Large Program aims at studying a set of crucial complex organic molecules in a sample of sources, with well-known physical structure,…
Seeds of Life in Space (SOLIS). VI. Chemical evolution of sulfuretted species along the outflows driven by the low-mass protostellar binary NGC1333-IRAS4A
Vianney Taquet, Claudio Codella, Marta de Simone +8
Context. Low-mass protostars drive powerful molecular outflows that can be observed with mm and sub-mm telescopes. Various sulfuretted species are known to be bright in shocks and…
Evaporative cooling of icy interstellar grains. I. Basic characterization
Juris Kalvans, Juris Roberts Kalnin
Context. While radiative cooling of interstellar grains is a well-known process, little detail is known about the cooling of grains with an icy mantle that contains volatile adsorb…
ALMA and ROSINA detections of phosphorus-bearing molecules: the interstellar thread between star-forming regions and comets
V. M. Rivilla, M. N. Drozdovskaya, K. Altwegg +11
To understand how Phosphorus-bearing molecules are formed in star-forming regions, we have analysed ALMA observations of PN and PO towards the massive star-forming region AFGL 5142…
The first steps of Interstellar Phosphorus Chemistry
Johanna Chantzos, Victor M. Rivilla, Anton Vasyunin +4
Phosphorus-bearing species are an essential key to form life on Earth, however they have barely been detected in the interstellar medium. Since only PN and PO have been identified…
Chemical significance of different temperature regimes for cosmic-ray-induced heating of whole interstellar grains
Juris Kalvans, Juris Roberts Kalnin
Cosmic-ray-induced whole-grain heating induces evaporation and other processes that affect the chemistry of interstellar clouds. With recent data on grain heating frequencies as an…
On Simulating the Proton-Irradiation of O and HO Ices Using Astrochemical-type Models, with Implications for Bulk Reactivity
Christopher N. Shingledecker, Anton Vasyunin, Eric Herbst +1
Many astrochemical models today explicitly consider the species that comprise the bulk of interstellar dust grain ice-mantles separately from those in the top few monolayers. Bomba…