Publications (31)
Probing the extragalactic fast transient sky at minute timescales with DECam
Igor Andreoni, Jeffrey Cooke, Sara Webb +22
Searches for optical transients are usually performed with a cadence of days to weeks, optimised for supernova discovery. The optical fast transient sky is still largely unexplored…
The progenitor of SN 2011ja: Clues from circumstellar interaction
Sayan Chakraborti, Alak Ray, Randall Smith +7
Massive stars, possibly red supergiants, which retain extended hydrogen envelopes until core collapse, produce Type II Plateau (IIP) supernovae. The ejecta from these explosions sh…
An Early & Comprehensive Millimeter and Centimeter Wave and X-ray Study of Supernova 2011dh: A Non-Equipartition Blastwave Expanding into A Massive Stellar Wind
Assaf Horesh, Christopher Stockdale, Derek B. Fox +24
Only a handful of supernovae (SNe) have been studied in multi-wavelength from radio to X-rays, starting a few days after explosion. The early detection and classification of the ne…
The radio re-brightening of the Type IIb SN 2001ig
Roberto Soria, Thomas D. Russell, Eli Wiston +5
We study the late-time evolution of the compact Type IIb SN 2001ig in the spiral galaxy NGC 7424, with new and unpublished archival data from the Australia Telescope Compact Array…
Deepest Near-IR Surface Photometry of Galaxies in the Local Sphere of Influence
Emma Kirby, Helmut Jerjen, Stuart Ryder +1
We present near-IR, deep (4 mag deeper than 2MASS) imaging of 56 Local Volume galaxies. Global parameters such as total magnitudes and stellar masses have been derived and the new…
Formation of Dense Molecular Gas and Stars at the Circumnuclear Starburst Ring in the Barred Galaxy NGC 7552
Hsi-An Pan, Jeremy Lim, Satoki Matsushita +2
We present millimeter molecular-line complemented by optical observations, along with a reanalysis of archival centimeter HI and continuum data, to infer the global dynamics and de…
Physical Properties of the X-ray Luminous SN 1978K in NGC 1313 from Multiwavelength Observations
Eric M. Schlegel, Stuart Ryder, L. Staveley-Smith +4
We update the light curves from the X-ray, optical, and radio bandpasses which we have assembled over the past decade, and present two observations in the ultraviolet using the Hub…
Millimetre-Wave and Near-Infrared Signposts of Massive Molecular Clump Evolution and Star Cluster Formation
Peter Barnes, Stuart Ryder, Stefan O'Dougherty +4
We report new near-infrared and mm-wave observational data on a selection of massive Galactic molecular clumps (part of the CHaMP sample) and their associated young star clusters.…
Weak Mass Loss from the Red Supergiant Progenitor of the Type II SN 2021yja
Griffin Hosseinzadeh, Charles D. Kilpatrick, Yize Dong +56
We present high-cadence optical, ultraviolet (UV), and near-infrared data of the nearby ( Mpc) Type II supernova (SN) 2021yja. Many Type II SNe show signs of interactio…
A pair of leading spiral arms in a luminous infrared galaxy?
Petri Vaisanen, Stuart Ryder, Seppo Mattila +1
Leading spiral arms are a rare phenomenon. We present here one of the very few convincing candidates of spiral arms opening counter-intuitively in the same direction as the galaxy…
Deep Near-IR Surface Photometry of 57 Galaxies in the Local Sphere of Influence
Emma Kirby, Helmut Jerjen, Stuart Ryder +1
We present H-band surface photometry of 57 galaxies drawn from the Local Sphere of Influence (LSI) with distances of less than 10 Mpc from the Milky Way. The images with a typical…
Star formation properties and dynamics of Luminous Infrared Galaxies with adaptive optics
Petri Vaisanen, Seppo Mattila, Stuart Ryder
Near infrared adaptive optics observations are crucial to be able to interpret kinematic and dynamical data and study star formation properties within the often extremely dusty int…
The mysterious HI deficiency of NGC 3175
Michael Dahlem, Matthias Ehle, Stuart Ryder
Australia Telescope Compact Array HI observations reveal the existence of 5.8x10^8 M_sun of HI gas in the central 7 kpc of the edge-on spiral galaxy NGC 3175. The detected HI and C…
KSP-SN-2016kf: a long-rising H-rich Type II Supernova with unusually high Ni mass discovered in the KMTNet Supernova Program
Niloufar Afsariardchi, Dae-Sik Moon, Maria R. Drout +12
We present the discovery and the photometric and spectroscopic study of H-rich Type II supernova (SN) KSP-SN-2016kf (SN2017it) observed in the KMTNet Supernova Program in the outsk…
Mary, a pipeline to aid discovery of optical transients
Igor Andreoni, Colin Jacobs, Sarah Hegarty +3
The ability to quickly detect transient sources in optical images and trigger multi-wavelength follow up is key for the discovery of fast transients. These include events rare and…
Searching for obscured supernovae in nearby starburst galaxies
Seppo Mattila, Robert Greimel, Peter Meikle +3
We are currently carrying out a K_s band survey for core-collapse supernovae in the nuclear (central kpc) regions of nearby starburst galaxies with the INGRID near-IR camera at the…
H.E.S.S. ToO program on nearby core-collapse Supernovae: search for very-high energy -ray emission towards the SN candidate AT2019krl in M74
Nukri Komin, Matthieu Renaud, Rachel Simoni +1
While the youngest known supernova remnants, such as Cassiopeia A, have been proven to be able to accelerate cosmic rays only up to 10 at their present ev…
The low density and magnetization of a massive galaxy halo exposed by a fast radio burst
J. Xavier Prochaska, Jean-Pierre Macquart, Matthew McQuinn +16
Present-day galaxies are surrounded by cool and enriched halo gas extending to hundreds of kiloparsecs. This halo gas is thought to be the dominant reservoir of material available…
The final months of massive star evolution from the circumstellar environment around SN Ic 2020oi
Keiichi Maeda, Poonam Chandra, Tomoki Matsuoka +8
We present the results of ALMA band 3 observations of a nearby type Ic supernova (SN) 2020oi. Under the standard assumptions on the SN-circumstellar medium (CSM) interaction and th…
The Candidate Progenitor Companion Star of the Type Ib/c SN 2013ge
Ori D. Fox, Schuyler D. Van Dyk, Benjamin F. Williams +17
This Letter presents the detection of a source at the position of the Type Ib/c supernova (SN) 2013ge more than four years after the radioactive component is expected to have faded…
Near-infrared adaptive optics imaging of infrared luminous galaxies: the brightest cluster magnitude - star formation rate relation
Zara Randriamanakoto, Andres Escala, Petri Vaisanen +4
We have established a relation between the brightest super star cluster magnitude in a galaxy and the host star formation rate (SFR) for the first time in the near infrared (NIR).…
Star formation and AGN activity in a sample of local Luminous Infrared Galaxies through multi-wavelength characterization
Rubén Herrero-Illana, Miguel Ã. Pérez-Torres, Zara Randriamanakoto +8
Nuclear starbursts and AGN activity are the main heating processes in luminous infrared galaxies (LIRGs) and their relationship is fundamental to understand galaxy evolution. In th…
Probing Final Stages of Stellar Evolution with X-Ray Observations of SN 2013ej
Sayan Chakraborti, Alak Ray, Randall Smith +8
Massive stars shape their surroundings with mass loss from winds during their lifetimes. Fast ejecta from supernovae, from these massive stars, shocks this circumstellar medium. Em…
A Multi-Wavelength View on the Rapidly-Evolving Supernova 2018ivc: An Analog of SN IIb 1993J but Powered Primarily by Circumstellar Interaction
Keiichi Maeda, Poonam Chandra, Takashi J. Moriya +15
SN 2018ivc is an unusual type II supernova (SN II). It is a variant of SNe IIL, which might represent a transitional case between SNe IIP with a massive H-rich envelope, and IIb wi…
The Environments of Fast Radio Bursts Viewed Using Adaptive Optics
Michele N. Woodland, Alexandra G. Mannings, J. Xavier Prochaska +10
We present GeMS/GSAOI observations of five fast radio burst (FRB) host galaxies with sub-arcsecond localizations. We examine and quantify their spatial distributions and locations…
Super star clusters and Supernovae in interacting LIRGs unmasked by NIR adaptive optics
Petri Vaisanen, Zara Randriamanakoto, Erkki Kankare +2
We report on an on-going near-IR adaptive optics survey targeting interacting luminous IR galaxies. High-spatial resolution NIR data are crucial to enable interpretation of kinemat…
Resurrection of type IIL supernova 2018ivc: Implications for a binary evolution sequence connecting hydrogen-rich and -poor progenitors
Keiichi Maeda, Tomonari Michiyama, Poonam Chandra +4
Long-term observations of synchrotron emission from supernovae (SNe), covering more than a year after the explosion, provide a unique opportunity to study the poorly-understood evo…
Central regions of LIRGs: rings, hidden starbursts, Supernovae and star clusters
Petri Vaisanen, Andres Escala, Erkki Kankare +7
We study star formation (SF) in very active environments, in luminous IR galaxies, which are often interacting. A variety of phenomena are detected, such as central starbursts, cir…
The K-band luminosity functions of super star clusters in luminous infrared galaxies, their slopes, and the effects of blending
Zara Randriamanakoto, Petri Vaisanen, Stuart Ryder +3
Super star clusters (SSCs) are typically found in interacting galaxies and trace an extreme form of star-formation. We present a K-band study of SSC candidates in a sample of local…
The ASKAP Variables and Slow Transients (VAST) Pilot Survey
Tara Murphy, David L. Kaplan, Adam J. Stewart +52
The Variables and Slow Transients Survey (VAST) on the Australian Square Kilometre Array Pathfinder (ASKAP) is designed to detect highly variable and transient radio sources on tim…
Near-infrared [Fe II] and H Emission-line Study of Galactic Supernova Remnants in the First Quadrant
Yong-Hyun Lee, Bon-Chul Koo, Jae-Joon Lee +2
We report the detection of near-infrared (NIR) [Fe II] (1.644 m) and H 1-0 S(1) (2.122 m) line features associated with Galactic supernova remnants (SNRs) in the firs…