Zobrazeno 1 - 10
of 401
pro vyhledávání: '"Gobrecht, P."'
Autor:
Uttenthaler, S., Shetye, S., Nanni, A., Aringer, B., Eriksson, K., McDonald, I., Gobrecht, D., Höfner, S., Wolter, U., Cristallo, S., Bernhard, K.
Context: The details of the mass-loss process in the late stages of low- and intermediate-mass stellar evolution are not well understood, in particular its dependence on stellar parameters. Mira variables are highly suitable targets for studying this
Externí odkaz:
http://arxiv.org/abs/2409.19604
Autor:
Danilovich, T., Malfait, J., Van de Sande, M., Montargès, M., Kervella, P., De Ceuster, F., Coenegrachts, A., Millar, T. J., Richards, A. M. S., Decin, L., Gottlieb, C. A., Pinte, C., De Beck, E., Price, D. J., Wong, K. T., Bolte, J., Menten, K. M., Baudry, A., de Koter, A., Etoka, S., Gobrecht, D., Gray, M., Herpin, F., Jeste, M., Lagadec, E., Maes, S., McDonald, I., Marinho, L., Müller, H. S. P., Pimpanuwat, B., Plane, J. M. C., Sahai, R., Wallström, S. H. J., Yates, J., Zijlstra, A.
Publikováno v:
Nature Astronomy, 8, pages 308-327 (2024)
Binary interactions have been proposed to explain a variety of circumstellar structures seen around evolved stars, including asymptotic giant branch (AGB) stars and planetary nebulae. Studies resolving the circumstellar envelopes of AGB stars have re
Externí odkaz:
http://arxiv.org/abs/2407.16979
Autor:
Gobrecht, Alexandra, Tuma, Felix, Möller, Moritz, Zöller, Thomas, Zakhvatkin, Mark, Wuttig, Alexandra, Sommerfeldt, Holger, Schütt, Sven
The grading of open-ended questions is a high-effort, high-impact task in education. Automating this task promises a significant reduction in workload for education professionals, as well as more consistent grading outcomes for students, by circumven
Externí odkaz:
http://arxiv.org/abs/2405.04323
Publikováno v:
A&A 690, A34 (2024)
We aim to understand the formation of cloud condensation nuclei in oxygen-rich substellar atmospheres by calculating fundamental properties of the energetically most favorable vanadium oxide molecules and clusters. A hierarchical optimization approac
Externí odkaz:
http://arxiv.org/abs/2401.02784
Autor:
Wallstrom, S. H. J., Danilovich, T., Muller, H. S. P., Gottlieb, C. A., Maes, S., Van de Sande, M., Decin, L., Richards, A. M. S., Baudry, A., Bolte, J., Ceulemans, T., De Ceuster, F., de Koter, A., Mellah, I. El, Esseldeurs, M., Etoka, S., Gobrecht, D., Gottlieb, E., Gray, M., Herpin, F., Jeste, M., Kee, D., Kervella, P., Khouri, T., Lagadec, E., Malfait, J., Marinho, L., McDonald, I., Menten, K. M., Millar, T. J., Montarges, M., Nuth, J. A., Plane, J. M. C., Sahai, R., Waters, L. B. F. M., Wong, K. T., Yates, J., Zijlstra, A.
The dusty winds of cool evolved stars are a major contributor of the newly synthesised material enriching the Galaxy and future generations of stars. However, the details of the physics and chemistry behind dust formation and wind launching have yet
Externí odkaz:
http://arxiv.org/abs/2312.03467
Autor:
Gobrecht, David, Hashemi, S. Rasoul, Plane, John M. C., Bromley, Stefan T., Nyman, Gunnar, Decin, Leen
Publikováno v:
A&A 680, A18 (2023)
Spinel (MgAl$_{2}$O$_{4}$) and krotite (CaAl$_{2}$O$_{4}$) are alternative candidates to alumina (Al$_2$O$_3$) as primary dust condensates in the atmospheres of oxygen-rich evolved stars. Moreover, spinel was proposed as a potential carrier of the ci
Externí odkaz:
http://arxiv.org/abs/2310.08521
Publikováno v:
A&A 680, A65 (2023)
Context. Clouds seem unavoidable in cool and dense environments, and hence, are necessary to explain observations of exoplanet atmospheres, most recently of WASP 96b with JWST. Understanding the formation of cloud condensation nuclei in non-terrestri
Externí odkaz:
http://arxiv.org/abs/2308.08297
ATOMIUM: Probing the inner wind of evolved O-rich stars with new, highly excited H$_2$O and OH lines
Autor:
Baudry, A., Wong, K. T., Etoka, S., Richards, A. M. S., Muller, H. S. P., Herpin, F., Danilovich, T., Gray, M. D., Wallstrom, S., Gobrecht, D., Khouri, T., Decin, L., Gottlieb, C. A., Menten, K. M., Homan, W., Millar, T. J., Montarges, M., Pimpanuwat, B., Plane, J. M. C., Kervella, P.
Publikováno v:
A&A 674, A125 (2023)
Water and the hydroxyl radical are major constituents of the envelope of O-rich late-type stars. Transitions involving energy levels that are highly excited have been observed in both H$_2$O and OH. These and more recently discovered transitions can
Externí odkaz:
http://arxiv.org/abs/2305.03171
Publikováno v:
Front. Astron. Space Sci., Sec. Astrochemistry, Volume 10, 2023
Reactions of SiO molecules have been postulated to initiate efficient formation of silicate dust particles in outflows around dying (AGB) stars. Both OH radicals and H$_2$O molecules can be present in these environments and their reactions with SiO a
Externí odkaz:
http://arxiv.org/abs/2303.05184
Publikováno v:
A&A 671, A169 (2023)
Nucleation is considered to be the first step in dust and cloud formation in the atmospheres of asymptotic giant branch (AGB) stars, exoplanets, and brown dwarfs. In these environments dust and cloud particles grow to macroscopic sizes when gas phase
Externí odkaz:
http://arxiv.org/abs/2302.08358