M. J. Barlow
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View article: The supernova 1987A system and its recent evolution – a review
The supernova 1987A system and its recent evolution – a review Open
Supernova 1987A was the closest supernova event to be observed in nearly 400 years. The outflowing ejecta from the explosion continues to interact with extended circumstellar material and with the equatorial ring (ER) in the triple ring sy…
View article: The Compact Object and Innermost Ejecta of SN 1987A
The Compact Object and Innermost Ejecta of SN 1987A Open
The first JWST observations of SN 1987A provided clear evidence that a compact object is ionizing the innermost ejecta. Here, we analyze a second epoch of JWST NIRSpec and MIRI/Medium-Resolution Spectrometer observations to better characte…
View article: The <i>JWST</i>/MIRI view of the planetary nebula NGC 6302 – I. A UV-irradiated torus and a hot bubble triggering PAH formation
The <i>JWST</i>/MIRI view of the planetary nebula NGC 6302 – I. A UV-irradiated torus and a hot bubble triggering PAH formation Open
NGC 6302 is a spectacular bipolar planetary nebula (PN) whose spectrum exhibits fast outflows and highly ionized emission lines, indicating the presence of a very hot central star (${\sim}$220 000 K). Its infrared spectrum reveals a mixed …
View article: <i>JWST</i> observations of the Ring Nebula (NGC 6720) – II. PAH emission
<i>JWST</i> observations of the Ring Nebula (NGC 6720) – II. PAH emission Open
Polycyclic aromatic hydrocarbons (PAHs) and carbonaceous dust have been observed in clumpy circumstellar environments, yet their formation and evolutionary pathways in such environments remain elusive. We aim to characterize the PAH emissi…
View article: JWST Observations of the Ring Nebula (NGC 6720). III. A Dusty Disk around Its Central Star
JWST Observations of the Ring Nebula (NGC 6720). III. A Dusty Disk around Its Central Star Open
The planetary nebula NGC 6720, also known as the “Ring Nebula,” is one of the most iconic examples of nearby planetary nebulae whose morphologies present a challenge to our theoretical understanding of the processes that govern the deaths …
View article: The Green Monster Hiding in Front of Cas A: JWST Reveals a Dense and Dusty Circumstellar Structure Pockmarked by Ejecta Interactions
The Green Monster Hiding in Front of Cas A: JWST Reveals a Dense and Dusty Circumstellar Structure Pockmarked by Ejecta Interactions Open
JWST observations of the young Galactic supernova remnant Cassiopeia A revealed an unexpected structure seen as a green emission feature in colored composite MIRI F1130W and F1280W images—hence dubbed the Green Monster—that stretches acros…
View article: The Green Monster hiding in front of Cas A: JWST reveals a dense and dusty circumstellar structure pockmarked by ejecta interactions
The Green Monster hiding in front of Cas A: JWST reveals a dense and dusty circumstellar structure pockmarked by ejecta interactions Open
JWST observations of the young Galactic supernova remnant Cassiopeia A revealed an unexpected structure seen as a green emission feature in colored composite MIRI F1130W and F1280W images - hence dubbed the Green Monster - that stretches a…
View article: Deep <i>JWST</i>/NIRCam imaging of Supernova 1987A
Deep <i>JWST</i>/NIRCam imaging of Supernova 1987A Open
JWST/NIRCam obtained high angular resolution (0.05–0.1 arcsec), deep near-infrared 1–5 $\mu$m imaging of Supernova (SN) 1987A taken 35 yr after the explosion. In the NIRCam images, we identify: (1) faint H2 crescents, which are emissions l…
View article: Shockingly Bright Warm Carbon Monoxide Molecular Features in the Supernova Remnant Cassiopeia A Revealed by JWST
Shockingly Bright Warm Carbon Monoxide Molecular Features in the Supernova Remnant Cassiopeia A Revealed by JWST Open
We present JWST NIRCam (F356W and F444W filters) and MIRI (F770W) images and NIRSpec Integral Field Unit (IFU) spectroscopy of the young Galactic supernova remnant Cassiopeia A (Cas A) to probe the physical conditions for molecular CO form…
View article: Shockingly Bright Warm Carbon Monoxide Molecular Features in the Supernova Remnant Cassiopeia A Revealed by JWST
Shockingly Bright Warm Carbon Monoxide Molecular Features in the Supernova Remnant Cassiopeia A Revealed by JWST Open
We present JWST NIRCam (F356W and F444W filters) and MIRI (F770W) images and NIRSpec- IFU spectroscopy of the young supernova remnant Cassiopeia A (Cas A). We obtained the data as part of a JWST survey of Cas A. The NIRCam and MIRI images …
View article: JWST MIRI Imager Observations of Supernova SN 1987A
JWST MIRI Imager Observations of Supernova SN 1987A Open
There exist very few mid-infrared (IR) observations of supernovae (SNe) in general. Therefore, SN 1987A, the closest visible SN in 400 yr, gives us the opportunity to explore the mid-IR properties of SNe, the dust in their ejecta, and the …
View article: A JWST Survey of the Supernova Remnant Cassiopeia A
A JWST Survey of the Supernova Remnant Cassiopeia A Open
We present initial results from a James Webb Space Telescope (JWST) survey of the youngest Galactic core-collapse supernova remnant, Cassiopeia A (Cas A), made up of NIRCam and MIRI imaging mosaics that map emission from the main shell, in…
View article: Emission lines due to ionizing radiation from a compact object in the remnant of Supernova 1987A
Emission lines due to ionizing radiation from a compact object in the remnant of Supernova 1987A Open
The nearby Supernova 1987A was accompanied by a burst of neutrino emission, which indicates that a compact object (a neutron star or black hole) was formed in the explosion. There has been no direct observation of this compact object. In t…
View article: JWST MIRI Imager Observations of Supernova SN 1987A
JWST MIRI Imager Observations of Supernova SN 1987A Open
There exist very few mid-infrared (IR) observations of supernovae (SNe) in general. Therefore, SN 1987A, the closest visible SN in 400 years, gives us the opportunity to explore the mid-IR properties of SNe, the dust in their ejecta and su…
View article: Serendipitous detection of the dusty Type IIL SN 1980K with <i>JWST</i>/MIRI
Serendipitous detection of the dusty Type IIL SN 1980K with <i>JWST</i>/MIRI Open
We present mid-infrared (mid-IR) imaging of the Type IIL supernova (SN) 1980K with the JWST more than 40 yr post-explosion. SN 1980K, located in the nearby (D ≈ 7 Mpc) ‘SN factory’ galaxy NGC 6946, was serendipitously captured in JWST/MIRI…
View article: From total destruction to complete survival: dust processing at different evolutionary stages in the supernova remnant Cassiopeia A
From total destruction to complete survival: dust processing at different evolutionary stages in the supernova remnant Cassiopeia A Open
The expanding ejecta of supernova remnants (SNRs) are believed to form dust in dense clumps of gas. Before the dust can be expelled into the interstellar medium and contribute to the interstellar dust budget, it has to survive the reverse …
View article: From total destruction to complete survival: Dust processing at different evolutionary stages in the supernova remnant Cassiopeia A
From total destruction to complete survival: Dust processing at different evolutionary stages in the supernova remnant Cassiopeia A Open
The expanding ejecta of supernova remnants (SNRs) are believed to form dust in dense clumps of gas. Before the dust can be expelled into the interstellar medium and contribute to the interstellar dust budget, it has to survive the reverse …
View article: Oxygen abundance of γ Vel from [O <scp>iii</scp>] 88 μm <i>Herschel</i>/PACS spectroscopy
Oxygen abundance of γ Vel from [O <span>iii</span>] 88 μm <i>Herschel</i>/PACS spectroscopy Open
We present Herschel PACS spectroscopy of the [O iii] 88.4 μm fine-structure line in the nearby WC8+O binary system γ Vel to determine its oxygen abundance. The critical density of this line corresponds to several 105R* such that it is spat…
View article: Data products and software for `X-ray diagnostics of Cassiopeia A's "Green Monster": evidence for dense shocked circumstellar plasma`
Data products and software for `X-ray diagnostics of Cassiopeia A's "Green Monster": evidence for dense shocked circumstellar plasma` Open
Data Reproduction Package for the publication ‘X-ray diagnostics of Cassiopeia A’s “Green Monster”: evidence for dense shocked circumstellar plasma’ Authors: Jacco Vink, Manan Agarwal, Patrick Slane, Ilse De Looze, Dan Milisavljevic, Danie…
View article: <i>JWST</i> observations of the Ring Nebula (NGC 6720): I. Imaging of the rings, globules, and arcs
<i>JWST</i> observations of the Ring Nebula (NGC 6720): I. Imaging of the rings, globules, and arcs Open
We present JWST images of the well-known planetary nebula NGC 6720 (the Ring Nebula), covering wavelengths from 1.6 to 25 $\, \mu$m. The bright shell is strongly fragmented with some 20 000 dense globules, bright in H2, with a characterist…
View article: JWST imaging observations of the Ring Nebula
JWST imaging observations of the Ring Nebula Open
We present JWST images of NGC 6720 (the Ring Nebula), covering wavelengths from 1.6 μ m to 25 μ m. The bright shell is strongly fragmented with some 20 000 dense globules, bright in H 2 , with a characteristic diameter of 0.2 arcsec and de…
View article: Ejecta, Rings, and Dust in SN 1987A with JWST MIRI/MRS
Ejecta, Rings, and Dust in SN 1987A with JWST MIRI/MRS Open
Supernova (SN) 1987A is the nearest supernova in $\sim$400 years. Using the {\em JWST} MIRI Medium Resolution Spectrograph, we spatially resolved the ejecta, equatorial ring (ER) and outer rings in the mid-infrared 12,927 days after the ex…
View article: Ejecta, Rings, and Dust in SN 1987A with JWST MIRI/MRS
Ejecta, Rings, and Dust in SN 1987A with JWST MIRI/MRS Open
Supernova (SN) 1987A is the nearest supernova in ∼400 yr. Using the JWST MIRI Medium Resolution Spectrograph, we spatially resolved the ejecta, equatorial ring (ER), and outer rings in the mid-infrared 12,927 days (35.4 yr) after the explo…
View article: Oxygen abundance of gamma Vel from [O III] 88um Herschel/PACS spectroscopy
Oxygen abundance of gamma Vel from [O III] 88um Herschel/PACS spectroscopy Open
We present Herschel PACS spectroscopy of the [O III] 88.4um fine-structure line in the nearby WC8+O binary system gamma Vel to determine its oxygen abundance. The critical density of this line corresponds to several 10^5 R* such that it is…
View article: Serendipitous detection of the dusty Type IIL SN 1980K with JWST/MIRI
Serendipitous detection of the dusty Type IIL SN 1980K with JWST/MIRI Open
We present mid-infrared (mid-IR) imaging of the Type IIL supernova (SN) 1980K with the James Webb Space Telescope (JWST) more than 40 yr post-explosion. SN 1980K, located in the nearby ($D\approx7$ Mpc) "SN factory" galaxy NGC 6946, was se…
View article: Evidence for late-time dust formation in the ejecta of supernova SN 1995N from emission-line asymmetries
Evidence for late-time dust formation in the ejecta of supernova SN 1995N from emission-line asymmetries Open
We present a study of the dust associated with the core-collapse supernova SN 1995N. Infrared emission detected 14–15 yr after the explosion was previously attributed to thermally echoing circumstellar material (CSM) associated with the su…
View article: Evidence for late-time dust formation in the ejecta of supernova SN~1995N from emission-line asymmetries
Evidence for late-time dust formation in the ejecta of supernova SN~1995N from emission-line asymmetries Open
We present a study of the dust associated with the core-collapse supernova SN~1995N. Infrared emission detected 14--15 years after the explosion was previously attributed to thermally echoing circumstellar material associated with the SN p…
View article: JWST observations of the Ring Nebula (NGC 6720): I. Imaging of the rings, globules, and arcs
JWST observations of the Ring Nebula (NGC 6720): I. Imaging of the rings, globules, and arcs Open
We present JWST images of the well-known planetary nebula NGC 6720 (the Ring Nebula), covering wavelengths from 1.6$μ$m to 25 $μ$m. The bright shell is strongly fragmented with some 20 000 dense globules, bright in H$_2$, with a characteri…
View article: JWST NIRSpec Observations of Supernova 1987A—From the Inner Ejecta to the Reverse Shock
JWST NIRSpec Observations of Supernova 1987A—From the Inner Ejecta to the Reverse Shock Open
We present initial results from JWST NIRSpec integral field unit observations of the nearby supernova SN 1987A. The observations provide the first spatially resolved spectroscopy of the ejecta and equatorial ring (ER) over the 1–5 μ m rang…
View article: Far-infrared polarization of the supernova remnant Cassiopeia A with SOFIA HAWC +
Far-infrared polarization of the supernova remnant Cassiopeia A with SOFIA HAWC + Open
We present polarization observations of the young supernova remnant (SNR) Cas A using the High-resolution Airborne Wideband Camera-Plus (HAWC +) instrument onboard the Stratospheric Observatory for Infrared Astronomy (SOFIA). The polarizat…