363 citations · 7.5k across the 142 of their papers we have counts for
141 papers
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…
Linking ice and gas in the Coronet cluster in Corona Australis
G. Perotti, J. K. Jørgensen, W. R. M. Rocha +7
During the journey from the cloud to the disc, the chemical composition of the protostellar envelope material can be either preserved or processed to varying degrees depending on t…
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…
Shock excitation of H in the James Webb Space Telescope era
L. E. Kristensen, B. Godard, P. Guillard +2
(Abridged) H2 is the most abundant molecule in the Universe. Thanks to its widely spaced energy levels, it predominantly lights up in warm gas, T > 100 K, such as shocked regions,…
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…
Investigating the Impact of Metallicity on Star Formation in the Outer Galaxy. I. VLT/KMOS Survey of Young Stellar Objects in Canis Major
Dominika Itrich, Agata Karska, Marta Sewiło +9
The effects of metallicity on the evolution of protoplanetary disks may be studied in the outer Galaxy where the metallicity is lower than in the solar neighbourhood. We present th…
Far-infrared line emission from the outer Galaxy cluster Gy 3-7 with SOFIA/FIFI-LS: Physical conditions and UV fields
N. Le, A. Karska, M. Figueira +13
(abridged) Far-infrared (FIR) line emission provides key information about the gas cooling and heating due to shocks and UV radiation associated with the early stages of star forma…
Star-formation-rate estimates from water emission
K. M. Dutkowska, L. E. Kristensen
(Abridged) The star-formation rate (SFR) quantitatively describes the star-formation process in galaxies. Current ways to calibrate this rate do not usually employ observational me…
Simulation of CHOH ice UV photolysis under laboratory conditions
W. R. M. Rocha, P. Woitke, S. Pilling +5
Methanol is the most complex molecule securely identified in interstellar ices and is a key chemical species for understanding chemical complexity in astrophysical environments. Im…
An Ice Age JWST inventory of dense molecular cloud ices
M. K. McClure, W. R. M. Rocha, K. M. Pontoppidan +39
Icy grain mantles are the main reservoir of the volatile elements that link chemical processes in dark, interstellar clouds with the formation of planets and composition of their a…
Physical properties of accretion shocks toward the Class I protostellar system Oph-IRS 44
E. Artur de la Villarmois, V. V. Guzmán, J. K. Jørgensen +6
(Abridged) Physical processes such as accretion shocks are thought to be common in the protostellar phase, where the envelope component is still present, and they can release molec…
Water emission tracing active star formation from the Milky Way to high- galaxies
K. M. Dutkowska, L. E. Kristensen
(Abridged) The question of how most stars in the Universe form remains open. While star formation predominantly occurs in young massive clusters, the current framework focuses on i…
A census of young stellar objects in two line-of-sight star forming regions toward IRAS 22147+5948 in the outer Galaxy
Agata Karska, Maciej Koprowski, Aleksandra Solarz +9
(abridged) Star formation in the outer Galaxy, i.e., outside of the Solar circle, has been lightly studied in part due to low CO brightness of molecular clouds linked with the nega…
The Detection of Deuterated Water in the Large Magellanic Cloud with ALMA
Marta Sewiło, Agata Karska, Lars E. Kristensen +10
We report the first detection of deuterated water (HDO) toward an extragalactic hot core. The HDO 2-2 line has been detected toward hot cores N105-2A and 2B in the N1…
Connecting Galactic and extragalactic outflows: From the Cygnus-X cluster to active galaxies
I. M. Skretas, L. E. Kristensen
Molecular outflows are often detected originating from both protostellar and extragalactic sources. Studies of low-mass, isolated high-mass, and extragalactic sources reveal scalin…
ALMA Observations of Molecular Complexity in the Large Magellanic Cloud: The N105 Star-Forming Region
Marta Sewiło, Martin Cordiner, Steven B. Charnley +17
The Large Magellanic Cloud (LMC) is the nearest laboratory for detailed studies on the formation and survival of complex organic molecules (COMs), including biologically important…
Atomic Shocks in the Outflow of L1551 IRS 5 Identified with SOFIA-upGREAT Observations of [OI]
Yao-Lun Yang, Neal J. Evans, Agata Karska +5
We present velocity resolved SOFIA/upGREAT observations of [OI] and [CII] lines toward a Class I protostar, L1551 IRS 5, and its outflows. The SOFIA observations detect [OI] emissi…
Linking High- and Low-Mass Star Formation: Observation-Based Continuum Modelling and Physical Conditions
R. L. Pitts, L. E. Kristensen, J. K. Jørgensen +1
Astronomers have yet to establish whether high-mass protostars form from high-mass prestellar cores, similar to their lower-mass counterparts, or from lower-mass fragments at the h…
Signatures of UV radiation in low-mass protostars I. Origin of HCN and CN emission in the Serpens Main region
A. Mirocha, A. Karska, M. Gronowski +6
Context: Ultraviolet radiation (UV) influences the physics and chemistry of star-forming regions, but its properties and significance in the immediate surroundings of low-mass prot…
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 -…
Fitting infrared ice spectra with genetic modelling algorithms. Presenting the ENIIGMA fitting tool
Will R. M. Rocha, Giulia Perotti, Lars E. Kristensen +1
Context. A variety of laboratory ice spectra simulating different chemical environments, ice morphology as well as thermal and energetic processing are demanded to provide an accur…
ALMA observations of doubly deuterated water: Inheritance of water from the prestellar environment
S. S. Jensen, J. K. Jørgensen, L. E. Kristensen +5
Establishing the origin of the water D/H ratio in the Solar System is central to our understanding of the chemical trail of water during the star and planet formation process. Rece…
Water in star-forming regions (WISH): Physics and chemistry from clouds to disks as probed by Herschel spectroscopy
E. F. van Dishoeck, L. E. Kristensen, the WISH team
(abridged) Data and results from the WISH key program are summarized, designed to provide a legacy data set to address its physics and chemistry. WISH targeted ~80 sources along th…