Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Juris Kalvāns"'
Autor:
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 mantles on interstellar grains. With a simple astrochemical model, we inve
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ff35aff98b5689886085dddf019d2637
Temperature Spectra of Interstellar Dust Grains Heated by Cosmic Rays. III. Mixed-composition Grains
Autor:
Juris Kalvāns, Juris Roberts Kalnin
Publikováno v:
The Astrophysical Journal Supplement Series. 263:5
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 compared to simple single-material grains. We aim to calculate the spectra o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a8ce9ff8ecb895fc8e71957598445a3c
https://doi.org/10.3847/1538-4365/ac92e6
https://doi.org/10.3847/1538-4365/ac92e6
Autor:
Juris Roberts Kalnin, Juris Kalvāns
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 486:2050-2062
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 input for a modified rate-equation astrochemical model, this study ex
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4926e1877e48d734504295bd101b91cf
https://doi.org/10.1093/mnras/stz1010
https://doi.org/10.1093/mnras/stz1010
Autor:
Juris Kalvāns
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 promoted in star-forming cores exposed to radiation from the interstellar med
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a01a1d80558226e208c4a3219fbdd7db
http://arxiv.org/abs/2102.02681
http://arxiv.org/abs/2102.02681
Autor:
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 thermal desorption of icy species, affecting the chemical composition
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eb67afcbef89e2857361f0c9165ba185
http://arxiv.org/abs/2007.04720
http://arxiv.org/abs/2007.04720
Autor:
Juris Kalvāns
Publikováno v:
Proceedings of the International Astronomical Union. 13:374-380
The diffusion and photoprocessing of molecules within interstellar ices has been verified experimentally but often not fully included in astrochemical models. With models that consider photodissociation, binary reactions, and diffusion for molecules
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::92ecd417fb584dd9936e3405e28d1bd6
https://doi.org/10.1017/s1743921317006706
https://doi.org/10.1017/s1743921317006706
Autor:
Juris Roberts Kalnin, Juris Kalvāns
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 adsorbed molecules. Aims. We explore basic details for the cooling process o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7474bce02cf93c58481150037963d5ac
http://arxiv.org/abs/1912.11378
http://arxiv.org/abs/1912.11378
Autor:
Juris Kalvāns
Processing by interstellar photons affects the composition of the icy mantles on interstellar grains. The rate of photodissociation in solids differs from that of molecules in the gas phase. The aim of this work was to determine an average, general r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3ac65dafb2a567cc32628f365544910a
http://arxiv.org/abs/1805.03618
http://arxiv.org/abs/1805.03618
Autor:
Juris Kalvāns
Cosmic-ray (CR) induced heating of whole interstellar grains is an important desorption mechanism for grain surface molecules in interstellar molecular clouds. This study aims to provide a detailed temperature spectra for such CR-induced heating. For
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::45b40dcc5a71e4de66b2c49336090a3c
Autor:
Juris Kalvāns
Heating of whole interstellar dust grains by cosmic-ray (CR) particles affects the gas-grain chemistry in molecular clouds by promoting molecule desorption, diffusion, and chemical reactions on grain surfaces. The frequency of such heating $f_T$, s$^
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::451fac94e5c1d329eeb1dbb154baaa75