402 citations · 2.4k across the 37 of their papers we have counts for
37 papers
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…
LOFAR 144-MHz follow-up observations of GW170817
J. W. Broderick, T. W. Shimwell, K. Gourdji +66
We present low-radio-frequency follow-up observations of AT 2017gfo, the electromagnetic counterpart of GW170817, which was the first binary neutron star merger to be detected by A…
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: 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: 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: 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…
The ALMA-PILS survey: The sulphur connection between protostars and comets: IRAS 16293-2422 B and 67P/Churyumov-Gerasimenko
Maria N. Drozdovskaya, Ewine F. van Dishoeck, Jes K. Jørgensen +9
The evolutionary past of our Solar System can be pieced together by comparing analogous low-mass protostars with remnants of our Protosolar Nebula - comets. Sulphur-bearing molecul…
First detection of cyanamide (NHCN) towards solar-type protostars
A. Coutens, E. R. Willis, R. T. Garrod +11
Searches for the prebiotically-relevant cyanamide (NHCN) towards solar-type protostars have not been reported in the literature. We here present the first detection of this spe…
The ALMA-PILS survey: 3D modeling of the envelope, disks and dust filament of IRAS 16293-2422
S. K. Jacobsen, J. K. Jørgensen, M. H. D. van der Wiel +8
Context. The Class 0 protostellar binary IRAS 16293-2422 is an interesting target for (sub)millimeter observations due to, both, the rich chemistry toward the two main components o…
The ALMA-PILS survey: Formaldehyde deuteration in warm gas on small scales toward IRAS 16293-2422 B
M. V. Persson, J. K. Jørgensen, H. S. P. Müller +7
[abridged] The enhanced degrees of deuterium fractionation observed in envelopes around protostars demonstrate the importance of chemistry at low temperatures, relevant in pre- and…
Far-infrared to millimeter data of protoplanetary disks: dust growth in the Taurus, Ophiuchus, and Chamaeleon I star-forming regions
Álvaro Ribas, Catherine C. Espaillat, Enrique Macías +7
Far-infrared and (sub)millimeter fluxes can be used to study dust in protoplanetary disks, the building blocks of planets. Here, we combine observations from the Herschel Space Obs…
Resolved images of a protostellar outflow launched by an extended disk wind
Per Bjerkeli, Matthijs H. D. van der Wiel, Daniel Harsono +2
Young stars are associated with prominent outflows of molecular gas. The ejection of gas via these outflows is believed to remove angular momentum from the protostellar system, thu…
The ALMA-PILS survey: First detections of ethylene oxide, acetone and propanal toward the low-mass protostar IRAS 16293-2422
J. M. Lykke, A. Coutens, J. K. Jørgensen +14
One of the open questions in astrochemistry is how complex organic and prebiotic molecules are formed. Aims. Our aim is to start the process of compiling an inventory of oxygen-bea…
The ALMA Protostellar Interferometric Line Survey (PILS): First results from an unbiased submillimeter wavelength line survey of the Class 0 protostellar binary IRAS 16293-2422 with ALMA
J. K. Jørgensen, M. H. D. van der Wiel, A. Coutens +14
The inner regions of the envelopes surrounding young protostars are characterised by a complex chemistry, with prebiotic molecules present on the scales where protoplanetary disks…
Three-dimensional distribution of hydrogen fluoride gas toward NGC6334 I and I(N)
M. H. D. van der Wiel, D. A. Naylor, G. Makiwa +2
Aims. We investigate the spatial distribution of a collection of absorbing gas clouds, some associated with the dense, massive star-forming core NGC6334 I, and others with diffuse…
The ALMA-PILS survey: First detections of deuterated formamide and deuterated isocyanic acid in the interstellar medium
A. Coutens, J. K. Jørgensen, M. H. D. van der Wiel +15
Formamide (NHCHO) has previously been detected in several star-forming regions and is thought to be a precursor for different prebiotic molecules. Its formation mechanism is st…
The Spatial Variation of the Cooling Lines in the Reflection Nebula NGC7023
J. Bernard-Salas, E. Habart, M. Köhler +7
Context: The north-west photo-dissociation region (PDR) in the reflection nebula NGC 7023 displays a complex structure. Filament-like condensations at the edge of the cloud can be…
The HIFI spectral survey of AFGL 2591 (CHESS). III. Chemical structure of the protostellar envelope
Maja Kazmierczak-Barthel, Dimitri Semenov, Floris van der Tak +2
We aim to understand the rich chemical composition of AFGL 2591, a prototypical isolated high-mass star-forming region. Based on HIFI and JCMT data, the molecular abundances of spe…
Physical structure of the photodissociation regions in NGC 7023. Observations of gas and dust emission with Herschel
M. Köhler, E. Habart, H. Arab +16
The determination of the physical conditions in molecular clouds is a key step towards our understanding of their formation and evolution of associated star formation. We investiga…
Signatures of warm carbon monoxide in protoplanetary discs observed with Herschel SPIRE
M. H. D. van der Wiel, D. A. Naylor, I. Kamp +9
Molecular gas constitutes the dominant mass component of protoplanetary discs. To date, these sources have not been studied comprehensively at the longest far-infrared and shortest…
Herschel SPIRE FTS Spectral Mapping Calibration
Dominique Benielli, Edward Polehampton, Rosalind Hopwood +12
The Herschel SPIRE Fourier transform spectrometer (FTS) performs spectral imaging in the 447-1546 GHz band. It can observe in three spatial sampling modes: sparse mode, with a sing…
Gas signatures of Herbig Ae/Be disks probed with Herschel SPIRE spectroscopy
Matthijs H. D. van der Wiel, David A. Naylor, Giambattista Aresu +1
Herbig Ae/Be objects, like their lower mass counterparts T Tauri stars, are seen to form a stable circumstellar disk which is initially gas-rich and could ultimately form a planeta…
Observing Extended Sources with the \Herschel SPIRE Fourier Transform Spectrometer
Ronin Wu, Edward T. Polehampton, Mireya Etxaluze +20
The Spectral and Photometric Imaging Receiver (SPIRE) on the European Space Agency's Herschel Space Observatory utilizes a pioneering design for its imaging spectrometer in the for…
Astronomical imaging Fourier spectroscopy at far-infrared wavelengths
David A. Naylor, Brad G. Gom, Matthijs H. D. van der Wiel +1
The principles and practice of astronomical imaging Fourier transform spectroscopy (FTS) at far-infrared wavelengths are described. The Mach-Zehnder interferometer design has been…