Publications (17)
Are massive dense clumps truly sub-virial? A new analysis using Gould Belt ammonia data
Ayushi Singh, Christopher D. Matzner, Rachel K. Friesen +21
Dynamical studies of dense structures within molecular clouds often conclude that the most massive clumps contain too little kinetic energy for virial equilibrium, unless they are…
Relative Alignment between Dense Molecular Cores and Ambient Magnetic Field: The Synergy of Numerical Models and Observations
Che-Yu Chen, Erica A. Behrens, Jasmin E. Washington +26
The role played by magnetic field during star formation is an important topic in astrophysics. We investigate the correlation between the orientation of star-forming cores (as defi…
The Green Bank Ammonia Survey (GAS): First Results of NH3 mapping the Gould Belt
Rachel K. Friesen, Jaime E. Pineda, Erik Rosolowsky +21
We present an overview of the first data release (DR1) and first-look science from the Green Bank Ammonia Survey (GAS). GAS is a Large Program at the Green Bank Telescope to map al…
A tale of three tails: A misaligned streamer and mysterious structures around [BHB2007]1
Aashish Gupta, Antonio S. Hales, L. Ilsedore Cleeves +8
Recent discoveries of streamer-like structures around protostellar sources challenge the traditional picture of isolated, axisymmetric star formation. Here, we present new ALMA obs…
The Green Bank Ammonia Survey: A Virial Analysis of Gould Belt Clouds in Data Release 1
Ronan Kerr, Helen Kirk, James Di Francesco +14
We perform a virial analysis of starless dense cores in three nearby star-forming regions : L1688 in Ophiuchus, NGC 1333 in Perseus, and B18 in Taurus. Our analysis takes advantage…
Droplets I: Pressure-Dominated Sub-0.1 pc Coherent Structures in L1688 and B18
Hope How-Huan Chen, Jaime E. Pineda, Alyssa A. Goodman +22
We present the observation and analysis of newly discovered coherent structures in the L1688 region of Ophiuchus and the B18 region of Taurus. Using data from the Green Bank Ammoni…
FAUST X: Formaldehyde in the Protobinary System [BHB2007] 11: Small Scale Deuteration
Lucy Evans, Charlotte Vastel, Francisco Fontani +16
Context. Deuterium in H-bearing species is enhanced during the early stages of star formation, however, only a small number of high spatial resolution deuteration studies exist tow…
Formation of dense structures induced by filament collisions. Correlation of density, kinematics and magnetic field in the Pipe nebula
Pau Frau, Josep M. Girart, Felipe Alves +3
Context. The Pipe nebula is a molecular cloud that lacks star formation feedback and has a relatively simple morphology and velocity structure. This makes it an ideal target to tes…
Probing the ion-neutral drift velocity towards the L1544 prestellar core: Detection of ambipolar diffusion using ND and para-NHD
Doris Arzoumanian, Silvia Spezzano, Tommaso Grassi +9
The dynamical role of the magnetic field in the star formation process is tightly linked to the coupling between matter and the field. This coupling is due to the interaction betwe…
The Green Bank Ammonia Survey: Observations of Hierarchical Dense Gas Structures in Cepheus-L1251
Jared Keown, James Di Francesco, Helen Kirk +20
We use Green Bank Ammonia Survey observations of NH (1,1) and (2,2) emission with 32'' FWHM resolution from a ~ 10 pc portion of the Cepheus-L1251 molecular cloud to iden…
PRODIGE -- envelope to disk with NOEMA VIII. Sulfur oxides trace a shock caused by a streamer in the inner envelope of a protostar
MarÃa Teresa Valdivia-Mena, Jaime E. Pineda, Caroline Gieser +24
(Abridged) Recently, streamers have been observed causing shocks at the outer edge of protoplanetary disks. The study of sulfur-bearing species can help us to understand the physic…
The Central 1000 au of a Pre-stellar Core Revealed with ALMA. II. Almost Complete Freeze-out
Paola Caselli, Jaime E. Pineda, Olli Sipilä +18
Pre-stellar cores represent the initial conditions in the process of star and planet formation. Their low temperatures (10 K) allow the formation of thick icy dust mantles, whic…
FAUST III. Misaligned rotations of the envelope, outflow, and disks in the multiple protostellar system of VLA 16232417
Satoshi Ohashi, Claudio Codella, Nami Sakai +69
We report a study of the low-mass Class-0 multiple system VLA 1623AB in the Ophiuchus star-forming region, using HCO (), CS (), and CCH () lines as…
Seeds of Life in Space (SOLIS). XIII. Nitrogen fractionation towards the protocluster OMC-2 FIR4
Lucy Evans, Francesco Fontani, Charlotte Vastel +8
Isotopic fractionation is an important tool to investigate the chemical history of our Solar System (SS). In particular, the isotopic fraction of nitrogen (14N/15N) is lower in com…
On the radiation driven alignment of dust grains: Detection of the polarization hole in a starless core
Felipe Alves, Pau Frau, Josep M. Girart +3
We aim to investigate the polarization properties of a starless core in a very early evolutionary stage. Linear polarization data reveal the properties of the dust grains in the di…
FAUST II. Discovery of a Secondary Outflow in IRAS 15398-3359: Variability in Outflow Direction during the Earliest Stage of Star Formation?
Yuki Okoda, Yoko Oya, Logan Francis +66
We have observed the very low-mass Class 0 protostar IRAS 15398-3359 at scales ranging from 50 au to 1800 au, as part of the ALMA Large Program FAUST. We uncover a linear feature,…
Seeds of Life in Space (SOLIS). III. Zooming into the methanol peak of the pre-stellar core L1544
Anna Punanova, Paola Caselli, Siyi Feng +41
Towards the pre-stellar core L1544, the methanol (CHOH) emission forms an asymmetric ring around the core centre, where CHOH is mostly in solid form, with a clear peak 4000…