J. Hatchell
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View article: The JCMT Gould Belt Survey: first results from the Corona Australis molecular cloud and evidence of variable dust emissivity indices in the Coronet region
The JCMT Gould Belt Survey: first results from the Corona Australis molecular cloud and evidence of variable dust emissivity indices in the Coronet region Open
We present 450 and 850 $\mu$m James Clerk Maxwell Telescope (JCMT) observations of the Corona Australis (CrA) molecular cloud taken as part of the JCMT Gould Belt Legacy Survey (GBLS). We present a catalogue of 39 starless and protostellar…
View article: Submillimeter and Mid-Infrared Variability of Young Stellar Objects in the M17SWex Intermediate-mass Star-forming Region
Submillimeter and Mid-Infrared Variability of Young Stellar Objects in the M17SWex Intermediate-mass Star-forming Region Open
We present a comprehensive analysis of young stellar object (YSO) variability within the M17 Southwest Extension (M17 SWex), using 3.5 yr of monitoring data from the James Clerk Maxwell Telescope (JCMT) Transient Survey at submillimeter an…
View article: Submillimeter and Mid-Infrared Variability of Young Stellar Objects in the M17SWex Intermediate-Mass Star-Forming Region
Submillimeter and Mid-Infrared Variability of Young Stellar Objects in the M17SWex Intermediate-Mass Star-Forming Region Open
We present a comprehensive analysis of young stellar object (YSO) variability within the M17 Southwest Extension (M17 SWex), using 3.5 years of monitoring data from the JCMT Transient Survey at sub-millimeter (sub-mm) and 9 years from the …
View article: The JCMT Transient Survey: Six Year Summary of 450/850 μm Protostellar Variability and Calibration Pipeline Version 2.0
The JCMT Transient Survey: Six Year Summary of 450/850 μm Protostellar Variability and Calibration Pipeline Version 2.0 Open
The James Clerk Maxwell Telescope (JCMT) Transient Survey has been monitoring eight Gould Belt low-mass star-forming regions since 2015 December and six somewhat more distant intermediate-mass star-forming regions since 2020 February with …
View article: Changing streetlighting schemes and the ecological availability of darkness
Changing streetlighting schemes and the ecological availability of darkness Open
Artificial light at night (ALAN), from streetlights and other sources, has a wide variety of impacts on the natural environment. A significant challenge remains, however, to predict at intermediate spatial extents (e.g. across a city) the …
View article: The JCMT Transient Survey: Six-Year Summary of 450/850\,$μ$m Protostellar Variability and Calibration Pipeline Version 2.0
The JCMT Transient Survey: Six-Year Summary of 450/850\,$μ$m Protostellar Variability and Calibration Pipeline Version 2.0 Open
The JCMT Transient Survey has been monitoring eight Gould Belt low-mass star-forming regions since December 2015 and six somewhat more distant intermediate-mass star-forming regions since February 2020 with SCUBA-2 on the JCMT at \ShortS a…
View article: JCMT BISTRO Observations: Magnetic Field Morphology of Bubbles Associated with NGC 6334
JCMT BISTRO Observations: Magnetic Field Morphology of Bubbles Associated with NGC 6334 Open
We study the H ii regions associated with the NGC 6334 molecular cloud observed in the submillimeter and taken as part of the B -fields In STar-forming Region Observations Survey. In particular, we investigate the polarization patterns and…
View article: JCMT BISTRO Observations: Magnetic Field Morphology of Bubbles Associated with NGC 6334
JCMT BISTRO Observations: Magnetic Field Morphology of Bubbles Associated with NGC 6334 Open
We study the HII regions associated with the NGC 6334 molecular cloud observed in the sub-millimeter and taken as part of the B-fields In STar-forming Region Observations (BISTRO) Survey. In particular, we investigate the polarization patt…
View article: B-fields in Star-forming Region Observations (BISTRO): Magnetic Fields in the Filamentary Structures of Serpens Main
B-fields in Star-forming Region Observations (BISTRO): Magnetic Fields in the Filamentary Structures of Serpens Main Open
We present 850 μ m polarimetric observations toward the Serpens Main molecular cloud obtained using the POL-2 polarimeter on the James Clerk Maxwell Telescope as part of the B-fields In STar-forming Region Observations survey. These observ…
View article: The JCMT Transient Survey: Four-year Summary of Monitoring the Submillimeter Variability of Protostars
The JCMT Transient Survey: Four-year Summary of Monitoring the Submillimeter Variability of Protostars Open
We present the four-year survey results of monthly submillimeter monitoring of eight nearby (<500 pc) star-forming regions by the JCMT Transient Survey. We apply the Lomb–Scargle Periodogram technique to search for and characterize variabi…
View article: Spatial statistics in star-forming regions: is star formation driven by column density alone?
Spatial statistics in star-forming regions: is star formation driven by column density alone? Open
Star formation is known to occur more readily where more raw materials are available. This is often expressed by a ‘Kennicutt–Schmidt’ relation where the surface density of young stellar objects (YSOs) is proportional to column density to …
View article: The JCMT Transient Survey: Four Year Summary of Monitoring the\n Submillimeter Variability of Protostars
The JCMT Transient Survey: Four Year Summary of Monitoring the\n Submillimeter Variability of Protostars Open
We present the four-year survey results of monthly submillimeter monitoring\nof eight nearby ($< 500 $pc) star-forming regions by the JCMT Transient Survey.\nWe apply the Lomb-Scargle Periodogram technique to search for and characterize\nv…
View article: The JCMT Gould Belt Survey: radiative heating by OB stars
The JCMT Gould Belt Survey: radiative heating by OB stars Open
Radiative feedback can influence subsequent star formation. We quantify the heating from OB stars in the local star-forming regions in the James Clerk Maxwell Telescope (JCMT) Gould Belt Survey. Dust temperatures are calculated from 450/85…
View article: Erratum: “The JCMT BISTRO Survey: Magnetic Fields Associated with a Network of Filaments in NGC 1333” (2020, ApJ, 899, 28)
Erratum: “The JCMT BISTRO Survey: Magnetic Fields Associated with a Network of Filaments in NGC 1333” (2020, ApJ, 899, 28) Open
In the published article, we presented high-resolution polarimetry data obtained by using JCMT SCUBA-2/POL-2, and compared them with the larger-scale magnetic structure observed by Planck (Planck Collaboration et al. 2020). There was a mis…
View article: Dust polarized emission observations of NGC 6334
Dust polarized emission observations of NGC 6334 Open
Context. Molecular filaments and hubs have received special attention recently thanks to new studies showing their key role in star formation. While the (column) density and velocity structures of both filaments and hubs have been carefull…
View article: The JCMT BISTRO Survey: Alignment between Outflows and Magnetic Fields in Dense Cores/Clumps
The JCMT BISTRO Survey: Alignment between Outflows and Magnetic Fields in Dense Cores/Clumps Open
We compare the directions of molecular outflows of 62 low-mass Class 0 and I protostars in nearby (<450 pc) star-forming regions with the mean orientations of the magnetic fields on 0.05–0.5 pc scales in the dense cores/clumps where they a…
View article: Dust polarized emission observations of NGC 6334; BISTRO reveals the details of the complex but organized magnetic field structure of the high-mass star-forming hub-filament network
Dust polarized emission observations of NGC 6334; BISTRO reveals the details of the complex but organized magnetic field structure of the high-mass star-forming hub-filament network Open
[Abridged] Filaments and hubs have received special attention recently thanks to studies showing their role in star formation. While the column density and velocity structures of both filaments and hubs have been studied, their magnetic fi…
View article: The JCMT BISTRO Survey: Revealing the Diverse Magnetic Field Morphologies in Taurus Dense Cores with Sensitive Submillimeter Polarimetry
The JCMT BISTRO Survey: Revealing the Diverse Magnetic Field Morphologies in Taurus Dense Cores with Sensitive Submillimeter Polarimetry Open
We have obtained sensitive dust continuum polarization observations at 850 μm in the B213 region of Taurus using POL-2 on SCUBA-2 at the James Clerk Maxwell Telescope as part of the B-fields in STar-forming Region Observations (BISTRO) sur…
View article: Probing the initial conditions of high-mass star formation
Probing the initial conditions of high-mass star formation Open
Context. Fragmentation and feedback are two important processes during the early phases of star formation. Aims. Massive clumps tend to fragment into clusters of cores and condensations, some of which form high-mass stars. In this work, we…
View article: Probing the initial conditions of high-mass star formation. III. Fragmentation and triggered star formation
Probing the initial conditions of high-mass star formation. III. Fragmentation and triggered star formation Open
Massive clumps tend to fragment into clusters of cores and condensations, some of which form high-mass stars. In this work, we study the structure of massive clumps at different scales, analyze the fragmentation process, and investigate th…
View article: Variability in the assembly of protostellar systems
Variability in the assembly of protostellar systems Open
The impact of variability on protostellar systems due to accretion bursts is largely unknown. High (spectral resolution capabilities with rapid response times in the IR, X-ray, and radio are critical to follow the course of accretion and o…
View article: The JCMT BISTRO Survey: The Magnetic Field in the Starless Core <i>ρ</i> Ophiuchus C
The JCMT BISTRO Survey: The Magnetic Field in the Starless Core <i>ρ</i> Ophiuchus C Open
We report 850~$\\mu$m dust polarization observations of a low-mass ($\\sim$12\n$M_{\\odot}$) starless core in the $\\rho$ Ophiuchus cloud, Ophiuchus C, made\nwith the POL-2 instrument on the James Clerk Maxwell Telescope (JCMT) as part\nof…
View article: Spatial statistics in star-forming regions: testing the limits of randomness
Spatial statistics in star-forming regions: testing the limits of randomness Open
Observational studies of star formation reveal spatial distributions of young stellar objects (YSOs) that are ‘snapshots’ of an ongoing star formation process. Using methods from spatial statistics it is possible to test the likelihood tha…
View article: An initial overview of the extent and structure of recent star formation within the Serpens Molecular Cloud using Gaia Data Release 2
An initial overview of the extent and structure of recent star formation within the Serpens Molecular Cloud using Gaia Data Release 2 Open
The dense clusters within the Serpens Molecular Cloud are among the most active regions of nearby star formation. In this paper, we use Gaia DR2 parallaxes and proper motions to statistically measure 1167 kinematic members of Serpens, few …
View article: Variability in the Assembly of Protostellar Systems
Variability in the Assembly of Protostellar Systems Open
Understanding the collapse of clouds and the formation of protoplanetary disks is essential to understanding the formation of stars and planets. Infall and accretion, the mass-aggregation processes that occur at envelope and disk scales, d…
View article: The warm and dense Galaxy - tracing the formation of dense cloud structures out to the Galactic Center
The warm and dense Galaxy - tracing the formation of dense cloud structures out to the Galactic Center Open
The past two decades have seen extensive surveys of the far-infrared to submillimeter continuum emission in the plane of our Galaxy. We line out prospects for the coming decade for corresponding molecular and atomic line surveys which are …
View article: The warm and dense Galaxy - tracing the formation of dense cloud\n structures out to the Galactic Center
The warm and dense Galaxy - tracing the formation of dense cloud\n structures out to the Galactic Center Open
The past two decades have seen extensive surveys of the far-infrared to\nsubmillimeter continuum emission in the plane of our Galaxy. We line out\nprospects for the coming decade for corresponding molecular and atomic line\nsurveys which a…
View article: Magnetic Fields toward Ophiuchus-B Derived from SCUBA-2 Polarization Measurements
Magnetic Fields toward Ophiuchus-B Derived from SCUBA-2 Polarization Measurements Open
We present the results of dust emission polarization measurements of Ophiuchus-B (Oph-B) carried out using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) camera with its associated polarimeter (POL-2) on the James Clerk Maxwell …
View article: A First Look at BISTRO Observations of the ρ Oph-A core
A First Look at BISTRO Observations of the ρ Oph-A core Open
We present 850 μ m imaging polarimetry data of the ρ Oph-A core taken with the Submillimeter Common-User Bolometer Array-2 (SCUBA-2) and its polarimeter (POL-2) as part of our ongoing survey project, -fields In STar forming RegiOns (BISTRO…
View article: The TOP-SCOPE Survey of Planck Galactic Cold Clumps: Survey Overview and Results of an Exemplar Source, PGCC G26.53+0.17
The TOP-SCOPE Survey of Planck Galactic Cold Clumps: Survey Overview and Results of an Exemplar Source, PGCC G26.53+0.17 Open
The low dust temperatures (<14 K) of Planck Galactic cold clumps (PGCCs) make them ideal targets to probe the initial conditions and very early phase of star formation. “TOP-SCOPE” is a joint survey program targeting ∼2000 PGCCs in J = 1–0…