44 citations · 118 across the 13 of their papers we have counts for
13 papers
JWST Edge-on Disk Ice (JEDIce): Vibrationally hot, rotationally cold H in the outer disk of Oph 163131 non-thermally excited by UV and cosmic rays
Korash Assani, Zhi-Yun Li, Jennifer B. Bergner +19
Constraining ionization and excitation processes in protoplanetary disks is essential for understanding the chemical structure and evolution of disk material, shaping planet format…
Mapping the Cosmic-Ray Ionization Rate in the Local Galaxy with H
Nick Indriolo, Alexei V. Ivlev, T. Pellegrin +6
Chemistry in diffuse molecular clouds relies primarily on rapid ion-molecule reactions. Formation of the initial ions, H and H, is dominated by cosmic-ray ionization of H…
H2 fluorescent emission from the diffuse interstellar medium
David A. Neufeld
A simple analytic model is presented to predict the near-IR H2 fluorescent line intensities emitted by diffuse interstellar clouds with a Plummer density profile. It is applicable…
JWST-IPA: Chemical Inventory and Spatial Mapping of Ices in the Protostar HOPS370 -- Evidence for an Opacity Hole and Thermal Processing of Ices
Himanshu Tyagi, Manoj P., Mayank Narang +35
The composition of protoplanetary disks, and hence the initial conditions of planet formation, may be strongly influenced by the infall and thermal processing of material during th…
The densities in diffuse and translucent molecular clouds: estimates from observations of C and from 3-dimensional extinction maps
David A. Neufeld, Daniel E. Welty, Alexei V. Ivlev +7
Newly-computed collisional rate coefficients for the excitation of C in collisions with H, presented recently by Najar and Kalugina (2020), are significantly larger than th…
Re-evaluation of the cosmic-ray ionization rate in diffuse clouds
M. Obolentseva, A. V. Ivlev, K. Silsbee +6
All current estimates of the cosmic-ray (CR) ionization rate rely on assessments of the gas density along the probed sight lines. Until now, these have been based on observations o…
Dissociative recombination of rotationally cold ArH
Ábel Kálosi, Manfred Grieser, Leonard W. Isberner +11
We have experimentally studied dissociative recombination (DR) of electronically and vibrationally relaxed ArH in its lowest rotational levels, using an electron--ion merged-be…
SOFIA/EXES Observations of Water Absorption in the Protostar AFGL 2591 at High Spectral Resolution
Nick Indriolo, D. A. Neufeld, C. N. DeWitt +8
We present high spectral resolution (~3 km/s) observations of the nu_2 ro-vibrational band of H2O in the 6.086--6.135 micron range toward the massive protostar AFGL 2591 using the…
First spectrally-resolved H observations towards HH 54 / Low HO abundance in shocks
G. Santangelo, S. Antoniucci, B. Nisini +11
Context: Herschel observations suggest that the HO distribution in outflows from low-mass stars resembles the H emission. It is still unclear which of the different excitat…
Fundamental Vibrational Transitions of HCl Detected in CRL 2136
Miwa Goto, T. Usuda, T. R. Geballe +3
We would like to understand the chemistry of dense clouds and their hot cores more quantitatively by obtaining more complete knowledge of the chemical species present in them. We h…
Water Absorption from Gas Very Near the Massive Protostar AFGL 2136 IRS 1
Nick Indriolo, D. A. Neufeld, A. Seifahrt +1
We present ground-based observations of the nu_1 and nu_3 fundamental bands of H2O toward the massive protostar AFGL 2136 IRS 1, identifying absorption features due to 47 different…
The widespread occurence of water vapor in the circumstellar envelopes of carbon-rich AGB stars: first results from a survey with Herschel/HIFI
D. A. Neufeld, E. González-Alfonso, G. Melnick +16
We report the preliminary results of a survey for water vapor in a sample of eight C stars with large mid-IR continuum fluxes: V384 Per, CIT 6, V Hya, Y CVn, IRAS 15194-5115, V Cyg…
First astronomical detection of the CF+ ion
D. A. Neufeld, P. Schilke, K. M. Menten +7
We report the first astronomical detection of the CF+ (fluoromethylidynium) ion obtained by recent observations of its J = 1 - 0 (102.6 GHz), J = 2 - 1 (205.2 GHz), and J = 3 - 2 (…