Zobrazeno 1 - 10
of 189
pro vyhledávání: '"Vasyunin, A I"'
Autor:
Petrashkevich, I. V., Punanova, A. F., Caselli, P., Sipilä, O., Pineda, J. E., Friesen, R. K., Korotaeva, M. G., Vasyunin, A. I.
In this work, we study deuterium fractionation in four starless cores in the low-mass star-forming region L1688 in the Ophiuchus molecular cloud. We study how the deuterium fraction ($R_D$) changes with environment, compare deuteration of ions and ne
Externí odkaz:
http://arxiv.org/abs/2401.04415
Nuclear spin ratios of deuterated ammonia in prestellar cores. LAsMA observations of H-MM1 and Oph D
Autor:
Harju, Jorma, Pineda, Jaime E., Sipilä, Olli, Caselli, Paola, Belloche, Arnaud, Wyrowski, Friedrich, Riedel, Wiebke, Redaelli, Elena, Vasyunin, Anton I.
We determine the ortho/para ratios of NH2D and NHD2 in two dense, starless cores, where their formation is supposed to be dominated by gas-phase reactions, which, in turn, is predicted to result in deviations from the statistical spin ratios. The Lar
Externí odkaz:
http://arxiv.org/abs/2311.08006
Publikováno v:
A&A 680, A87 (2023)
Aims. We aim to improve a previous model for the prediction of column densities and deuterium fractions of non- and singly deuterated methanol. Thereby, we try to identify crucial chemical and physical parameters, for which the study of deuteration c
Externí odkaz:
http://arxiv.org/abs/2310.08389
We study evolution of hydrogenated amorphous carbon (HAC) grains under harsh UV radiation in photo-dissociation regions (PDRs) near young massive stars. Our aim is to evaluate the impact of the HAC grains on formation of observed small hydrocarbons:
Externí odkaz:
http://arxiv.org/abs/2212.04993
Autor:
Megías, Andrés, Jiménez-Serra, Izaskun, Martín-Pintado, Jesús, Vasyunin, Anton I., Spezzano, Silvia, Caselli, Paola, Cosentino, Giuliana, Viti, Serena
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 519, Issue 2, February 2023, Pages 1601-1617
Recent observations of the pre-stellar core L1544 and the younger starless core L1498 have revealed that complex organic molecules (COMs) are enhanced in the gas phase toward their outer and intermediate-density shells. Our goal is to determine the l
Externí odkaz:
http://arxiv.org/abs/2211.16119
Publikováno v:
Bulletin of the Lebedev Physics Institute, 2021, vol. 48, no. 10, pp. 312-316
The vertical structure of the accretion disks of young stars with fossil large-scale magnetic field is studied. The equations of magnetostatic equilibrium of the disk are solved taking into account the stellar gravity, gas and magnetic pressure, turb
Externí odkaz:
http://arxiv.org/abs/2210.12667
Autor:
Schutzer, A. de A., Rivera-Ortiz, P. R., Lefloch, B., Gusdorf, A., Favre, C., Segura-Cox, D., Lopez-Sepulcre, A., Neri, R., Ospina-Zamudio, J., De Simone, M., Codella, C., Viti, S., Podio, L., Pineda, J., O'Donoghue, R., Ceccarelli, C., Caselli, P., Alves, F., Bachiller, R., Balucani, N., Bianchi, E., Bizzocchi, L., Bottinelli, S., Caux, E., Chacón-Tanarro, A., Dulieu, F., Enrique-Romero, J., Fontani, F., Feng, S., Holdship, J., Jiménez-Serra, I., Al-Edhari, A. Jaber, Kahane, C., Lattanzi, V., Oya, Y., Punanova, A., Rimola, A., Sakai, N., Spezzano, S., Sims, I. R., Taquet, V., Testi, L., Theulé, P., Ugliengo, P., Vastel, C., Vasyunin, A. I., Vazart, F., Yamamoto, S., Witzel, A.
Publikováno v:
A&A 662, A104 (2022)
Protostellar jets are an important agent of star formation feedback, tightly connected with the mass-accretion process. The history of jet formation and mass-ejection provides constraints on the mass accretion history and the nature of the driving so
Externí odkaz:
http://arxiv.org/abs/2203.09383
We present a study of emission lines of small hydrocarbons C$_2$H and $c$-C$_3$H$_2$, and COMs precursors H$_2$CO and CH$_3$OH in order to better understand the possible chemical link between the molecular abundances and UV radiation field in photodi
Externí odkaz:
http://arxiv.org/abs/2108.05387
Autor:
Jimenez-Serra, Izaskun, Vasyunin, Anton I., Spezzano, Silvia, Caselli, Paola, Cosentino, Giuliana, Viti, Serena
Observations carried out toward starless and pre-stellar cores have revealed that complex organic molecules are prevalent in these objects, but it is unclear what chemical processes are involved in their formation. Recently, it has been shown that co
Externí odkaz:
http://arxiv.org/abs/2105.08363
Autor:
Mullikin, Ella, Anderson, Hannah, O'Hern, Natalie, Farrah, Megan, Arumainayagam, Christopher R., van Dishoeck, Ewine F., Gerakines, Perry A., Vasyunin, Anton I., Majumdar, Liton, Caselli, Paola, Shingledecker, Christopher N.
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 production of electronically-excited (suprathermal) species is ex
Externí odkaz:
http://arxiv.org/abs/2101.01209