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Ammonium hydrosulfide (NH4SH) as a potentially significant sulfur sink in interstellar ices
van Dishoeck, E. F.; Slavicinska, K.; Kavanagh, P. J. +7 more
Context. Sulfur is depleted with respect to its cosmic standard abundance in dense star-forming regions. It has been suggested that this depletion is caused by the freeze-out of sulfur on interstellar dust grains, but the observed abundances and upper limits of sulfur-bearing ices remain too low to account for all of the missing sulfur. Toward the…
Ice inventory towards the protostar Ced 110 IRS4 observed with the James Webb Space Telescope: Results from the Early Release Science Ice Age program
Sun, F.; Egami, E.; van Dishoeck, E. F. +37 more
Context. Protostars contain icy ingredients necessary for the formation of potential habitable worlds, therefore, it is crucial to understand their chemical and physical environments. This work is focused on the ice features towards the binary protostellar system Ced 110 IRS4A and IRS4B, separated by 250 au and observed with James Webb Space Teles…
JOYS: The [D/H] abundance derived from protostellar outflows across the Galactic disk measured with JWST
Henning, T.; Güdel, M.; Ray, T. P. +11 more
Context. The total deuterium abundance [D/H] in the universe is set by just two processes: the creation of deuterium in Big Bang nucleosynthesis at an abundance of [D/H] = 2.58 ± 0.13 × 10‑5, and its destruction within stellar interiors (astration). Measurements of variations in the total [D/H] abundance can thus potentially provide a p…