Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Mahesh Rajappan"'
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 2, p 189 (2024)
The distribution of chemical species in protoplanetary disks around young stars, especially their division between gas and solid phases, fundamentally shapes the composition of future planets and planetesimals. This distribution is likely affected by
Externí odkaz:
https://doaj.org/article/27bdb376fe5a401cba417f73cf873eb7
Publikováno v:
The Astrophysical Journal, Vol 962, Iss 2, p 107 (2024)
Ice chemistry in the dense, cold interstellar medium (ISM) is probably responsible for the formation of interstellar complex organic molecules (COMs). Recent laboratory experiments performed at T ∼ 4 K have shown that irradiation of CO:N _2 ice sam
Externí odkaz:
https://doaj.org/article/6cff480f9ce34b1d84f9c407b8d01e62
Publikováno v:
The Astrophysical Journal, Vol 955, Iss 1, p 5 (2023)
Planets and planetesimals acquire their volatiles through ice and gas accretion in protoplanetary disks. In these disks, the division of volatile molecules between the condensed and gaseous phases determines the quantity of volatiles accreted by plan
Externí odkaz:
https://doaj.org/article/944ee6fdef0d4b579400e11612dfdd3d
Publikováno v:
The Astrophysical Journal, Vol 953, Iss 1, p 81 (2023)
Nitriles are key reactants in prebiotic synthesis networks of RNA bases and amino acids. The detection of CH _3 CN and other complex nitriles in planet-forming disks suggests that such molecules are regularly delivered to nascent planets, increasing
Externí odkaz:
https://doaj.org/article/c8428bd9a0cb474ab375ec9a94ad46f9
Autor:
Pavlo Maksyutenko, Rafael Martín-Doménech, Elettra L. Piacentino, Karin I. Öberg, Mahesh Rajappan
Benzonitrile (c-C6H5CN) has been recently detected in cold and dense regions of the interstellar medium, where it has been used as a signpost of a rich aromatic organic chemistry that might lead to the production of polycyclic aromatic hydrocarbons.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d2a6bab8e5e9884cbd0ef863c7e85b69
http://arxiv.org/abs/2210.03827
http://arxiv.org/abs/2210.03827
HCN is among the most commonly detected molecules in star- and planet-forming regions. It is of broad interest as a tracer of star-formation physics, a probe of nitrogen astrochemistry, and an ingredient in prebiotic chemical schemes. Despite this, o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0e6bbfb82030e7d6d854fc3254bf45f1
http://arxiv.org/abs/2206.04265
http://arxiv.org/abs/2206.04265
Autor:
Si Tong Bao, Hope Schneider, Julia Lukens, Subha Baniya, Kendra Cui, Leslie Gates, Christopher R. Arumainayagam, Pierce van Mulbregt, Lily Widdup, Aury Hay, Jyoti S Campbell, Geraldine Echebiri, Ella Mullikin, Mahesh Rajappan, Justine Huang, Christina E. Buffo, Mayla Thompson, Muhammad Kasule, Jean Huang, Zoe Peeler, Jeniffer Perea, Michael Boyer, Anna Caldwell-Overdier, Rhoda Tano-Menka, Helen M. Cumberbatch
Publikováno v:
ACS Earth and Space Chemistry. 2:863-868
We report postirradiation photochemistry studies of condensed ammonia using photons of energies below condensed ammonia’s ionization threshold of ∼9 eV. Hydrazine (N2H4), diazene (also known as dii...
Publikováno v:
Proceedings of the International Astronomical Union. 15:417-419
Complex organic molecules (COMs) may have played a role in the formation of life in the early Earth (Herbst & van Dishoeck (2009)). Here we present the formation of NH2CHO and CH3CHO upon vacuum-ultraviolet (VUV) irradiation of CO:NH3 and CO:CH4 ice
Autor:
Aida Behmard, Mahesh Rajappan, Edith C. Fayolle, Pavlo Maksyutenko, Jennifer B. Bergner, Karin I. Öberg, Rafael Martín-Doménech, Dawn Graninger
Small hydrocarbons are an important organic reservoir in protostellar and protoplanetary environments. Constraints on desorption temperatures and binding energies of such hydrocarbons are needed for accurate predictions of where these molecules exist
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f2cdfe5a5699e2b3112e0b1071d9d2d3
https://zenodo.org/record/2649397
https://zenodo.org/record/2649397
Publikováno v:
The Astrophysical Journal. 902:116
Interstellar ice mantles on the surfaces of dust grains are thought to have a bi-layered structure, with a H2O-rich polar layer, covered by a CO-rich apolar layer that probably harbors H2 and other volatiles such as N2. In this work, we explore the c