Search Publications
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…
Rapid mid-infrared spectral timing with JWST: GRS 1915+105 during an MIR-bright and X-ray-obscured state
Maccarone, T. J.; Altamirano, D.; Knigge, C. +45 more
We present mid-infrared (MIR) spectral-timing measurements of the prototypical Galactic microquasar GRS 1915+105. The source was observed with the Mid-Infrared Instrument (MIRI) onboard JWST in June 2023 at an MIR luminosity
Detection of the [O I] 63 µm emission line from the z = 6.04 quasar J2054-0005
Fujimoto, Seiji; Inoue, Akio K.; Hashimoto, Takuya +23 more
We report the highest-redshift detection of [O I] 63
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…
Unraveling the Dusty Environment around RT Vir
Sargent, B.; Speck, Angela K.; Preston, Michael D. +1 more
Infrared (IR) studies of asymptotic giant branch (AGB) stars are critical to our understanding of the formation of cosmic dust. In this investigation, we explore the mid- to far-IR emission of the oxygen-rich AGB star RT Virginis. This optically thin dusty environment has unusual spectral features when compared to other stars in its class. To expl…
Disk in the Circumstellar Envelope of Carbon Mira V Cygni
Strakhov, Ivan A.; Shenavrin, Victor I.; Safonov, Boris S. +2 more
Asymptotic giant branch (AGB) stars are the primary source of dust and complex molecules in the interstellar medium. The determination of outflow parameters is often hindered by the unknown geometry of the circumstellar environment, creating a demand for high-angular resolution observations. We use our near-infrared spectra and photometry of the c…