402 citations · 2.4k across the 34 of their papers we have counts for
34 papers
Mid-infrared extinction curve for protostellar envelopes from JWST-detected embedded jet emission: the case of TMC1A
K. D. Assani, Z. -Y. Li, J. P. Ramsey +15
Context: Dust grains are key components of the interstellar medium and play a central role in star formation, acting as catalysts for chemical reactions and as building blocks of p…
The Asymmetric Bipolar Fe II Jet and H2 Outflow of TMC1A Resolved with JWST's NIRSpec IFU
Korash Assani, Daniel Harsono, Jon Ramsey +10
(abridged) Protostellar outflows exhibit large variations in their structure depending on the observed gas emission. This study analyzes the atomic jet and molecular outflow in the…
Protostellar Interferometric Line Survey of the Cygnus-X region (PILS-Cygnus) -- The role of the external environment in setting the chemistry of protostars
S. J. van der Walt, L. E. Kristensen, H. Calcutt +2
(Abridged) Molecular lines are commonly detected towards protostellar sources. However, to get a better understanding of the chemistry of these sources we need unbiased molecular s…
Episodic infall towards a compact disk in B335?
Per Bjerkeli, Jon P. Ramsey, Daniel Harsono +7
Previous observations of B335 have presented evidence of ongoing infall in various molecular lines, e.g., HCO, HCN, CO. There have been no confirmed observations of a rotationa…
JWST Peers into the Class I Protostar TMC1A: Atomic Jet and Spatially Resolved Dissociative Shock Region
Daniel Harsono, Per Bjerkeli, Jon Ramsey +6
Outflows and winds launched from young stars play a crucial role in the evolution of protostars and the early stages of planet formation. However, the specific details of the mecha…
The prebiotic molecular inventory of Serpens SMM1: II. The building blocks of peptide chains
Niels F. W. Ligterink, Aida Ahmadi, Bijaya. Luitel +7
This work aims to constrain the abundances of interstellar amides, by searching for this group of prebiotic molecules in the intermediate-mass protostar Serpens SMM1-a. ALMA observ…
Protostellar Interferometric Line Survey of the Cygnus X region (PILS-Cygnus) -- First results: observations of CygX-N30
S. J. van der Walt, L. E. Kristensen, J. K. Jørgensen +5
(Abridged) Complex organic molecules (COMs) are commonly detected in and near star-forming regions. However, the dominant process in the release of these COMs from the icy grains -…
Resolved molecular line observations reveal an inherited molecular layer in the young disk around TMC1A
Daniel Harsono, Matthijs van der Wiel, Per Bjerkeli +4
Physical processes that govern the star and planet formation sequence influence the chemical composition and evolution of protoplanetary disks. To understand the chemical compositi…
The ALMA-PILS survey: First detection of the unsaturated 3-carbon molecules Propenal (CHCHO) and Propylene (CH) towards IRAS 162932422 B
S. Manigand, A. Coutens, J. -C. Loison +11
Complex organic molecules with three carbon atoms are found in the earliest stages of star formation. In particular, propenal (CHCHO) is a species of interest due to its im…
Linear dust polarization during the embedded phase of protostar formation
M. Kuffmeier, S. Reissl, S. Wolf +2
Measuring polarization from thermal dust emission can provide constraints on the magnetic field structure around embedded protostars. However, interpreting the observations is chal…
Constraining the Infalling Envelope Models of Embedded Protostars: BHR 71 and its Hot Corino
Y. -L. Yang, N. J. Evans, A. Smith +7
The collapse of the protostellar envelope results in the growth of the protostar and the development of a protoplanetary disk, playing a critical role during the early stages of st…
The ALMA-PILS survey: Inventory of complex organic molecules towards IRAS 16293-2422 A
S. Manigand, J. K. Jørgensen, H. Calcutt +6
Complex organic molecules (COM) are detected in many sources in the warm inner regions of envelopes surrounding deeply embedded protostars. Exactly how these COM form remains an op…
Temperature profiles of young disk-like structures: The case of IRAS 16293A
Merel L. R. van 't Hoff, Ewine F. van Dishoeck, Jes K. Jørgensen +1
Temperature is a crucial parameter in circumstellar disk evolution and planet formation, because it governs the resistance of the gas to gravitational instability and sets the chem…
The ALMA-PILS survey: propyne (CHCCH) in IRAS 162932422
H. Calcutt, E. R. Willis, J. K. Jørgensen +7
Context. Propyne (CHCCH) has been detected in a variety of environments, from Galactic star-forming regions to extragalactic sources. Such molecules are excellent tracers of th…
Kinematics around the B335 protostar down to au scales
Per Bjerkeli, Jon P. Ramsey, Daniel Harsono +6
Context. The relationship between outflow launching and formation of accretion disks around young stellar objects is still not entirely understood, which is why spectrally and spat…
The Bridge: a transient phenomenon of forming stellar multiples
Michael Kuffmeier, Hannah Calcutt, Lars E. Kristensen
Observations with modern instruments such as Herschel reveal that stars form clustered inside filamentary arms of ~1 pc length embedded in Giant Molecular Clouds. On smaller scales…
The ALMA-PILS survey: Gas dynamics in IRAS 162932422 and the connection between its two protostars
M. H. D. van der Wiel, S. K. Jacobsen, J. K. Jørgensen +10
[Abridged] The majority of stars form in binary or higher order systems. The Class 0 protostellar system IRAS16293-2422 contains two protostars, 'A' and 'B', separated by ~600 au a…
The ALMA-PILS survey: First detection of nitrous acid (HONO) in the interstellar medium
A. Coutens, N. F. W. Ligterink, J. -C. Loison +7
Nitrogen oxides are thought to play a significant role as a nitrogen reservoir and to potentially participate in the formation of more complex species. Until now, only NO, NO a…
The ALMA-PILS survey: The first detection of doubly-deuterated methyl formate (CHD2OCHO) in the ISM
S. Manigand, H. Calcutt, J. K. Jørgensen +9
Studies of deuterated isotopologues of complex organic molecules can provide important constraints on their origin in regions of star formation. In particular, the abundances of de…
The ALMA-PILS survey: Isotopic composition of oxygen-containing complex organic molecules toward IRAS 16293-2422B
J. K. Jørgensen, H. S. P. Müller, H. Calcutt +7
This paper presents a systematic survey of the deuterated and 13C isotopologues of a variety of oxygen-bearing complex organic molecules on Solar System scales toward the protostar…
The ALMA-PILS survey: Stringent limits on small amines and nitrogen-oxides towards IRAS 16293-2422B
N. F. W. Ligterink, H. Calcutt, A. Coutens +8
Hydroxylamine (NHOH) and methylamine (CHNH) have both been suggested as precursors to the formation of amino acids and are therefore of interest to prebiotic chem…
The ALMA-PILS survey: first detection of methyl isocyanide (CHNC) in a solar-type protostar
H. Calcutt, M. R. Fiechter, E. R. Willis +9
Methyl isocyanide (CHNC) is the isocyanide with the largest number of atoms confirmed in the interstellar medium (ISM), but it is not an abundant molecule, having only been det…
Tracing the cold and warm physico-chemical structure of deeply embedded protostars: IRAS 16293-2422 versus VLA 1623-2417
Nadia M. Murillo, Ewine F. van Dishoeck, Matthijs H. D. van der Wiel +4
Much attention has been placed on the dust distribution in protostellar envelopes, but there are still many unanswered questions regarding the structure of the gas. We aim to start…
The ALMA-PILS survey: Complex nitriles towards IRAS 16293--2422
H. Calcutt, J. K. Jørgensen, H. S. P. Müller +8
Complex organic molecules are readily detected in the inner regions of the gaseous envelopes of forming protostars. In particular, molecules that contain nitrogen are interesting d…