M. Lundquist
A5006270778- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Astrophysics and Star Formation Studies
- Radiation Detection and Scintillator Technologies
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Scientific Computing and Data Management
- Smart Grid and Power Systems
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Calibration and Measurement Techniques
- Color Science and Applications
- Methane Hydrates and Related Phenomena
- Particle Accelerators and Free-Electron Lasers
- Smart Grid Security and Resilience
- Radiative Heat Transfer Studies
- Real-time simulation and control systems
- Medical Imaging Techniques and Applications
- Neutrino Physics Research
W.M. Keck Observatory
2022-2024
University of Arizona
2019-2022
Gemini North Observatory
2016-2018
University of Wyoming
2012-2015
We analyze orbital solutions for 48 massive multiple-star systems in the Cygnus OB2 Association, 23 of which are newly presented here, to find that observed distribution periods is approximately uniform log P P<45 d, but it not scale-free. Inflections cumulative near 6 14, and 45 suggest key physical scales ~0.2, ~0.4, ~1 A.U. where yet-to-be-identified phenomena create distinct features. No single power law provides a statistically compelling prescription, if features ignored, with exponent...
Abstract We present the optical spectroscopic evolution of SN 2023ixf seen in subnight cadence spectra from 1.18 to 15 days after explosion. identify high-ionization emission features, signatures interaction with material surrounding progenitor star, that fade over first 7 days, rapid between observed within same night. compare lines and their relative strength those other supernovae early interaction, finding a close match 2020pni 2017ahn spectrum 2014G at later epochs. To physically...
We analyze pre-explosion near- and mid-infrared (IR) imaging of the site SN 2023ixf in nearby spiral galaxy M101 characterize candidate progenitor star. The star displays compelling evidence variability with a possible period $\approx$1000 days an amplitude $\Delta m \approx 0.6$ mag extensive monitoring Spitzer Space Telescope since 2004, likely indicative radial pulsations. Variability consistent this is also seen near-IR $J$ $K_{s}$ bands between 2010 2023, up to just 10 before explosion....
Abstract We present the densely sampled early light curve of Type II supernova (SN) 2023ixf, first observed within hours explosion in nearby Pinwheel Galaxy (Messier 101; 6.7 Mpc). Comparing these data to recently updated models shock-cooling emission, we find that progenitor likely had a radius 410 ± 10 R ⊙ . Our estimate is model dependent but consistent with red supergiant. These provide good fit starting about 1 day after explosion, despite fact classification spectrum shows signatures...
Abstract We present high-cadence photometric and spectroscopic observations of supernova (SN) 2024ggi, a Type II SN with flash spectroscopy features, which exploded in the nearby galaxy NGC 3621 at ∼7 Mpc. The light-curve evolution over first 30 hr can be fit by two power-law indices break after 22 hr, rising from M V ≈ −12.95 mag +0.66 day to −17.91 7 days. In addition, densely sampled color curve shows strong blueward few days then behaves as normal redward ejecta cool. Such deviations...
Abstract We perform a comprehensive search for optical precursor emission at the position of SN 2023ixf using data from DLT40, ZTF, and ATLAS surveys. By comparing current set with outburst hydrodynamical model light curves, we find that probability significant within 5 yr explosion is low, circumstellar material (CSM) ejected during any possible likely smaller than ∼0.015 M ⊙ . to toy models, that, if there was outburst, duration must have been shorter ∼100 days typical brightness r ≃ −9...
We present photometric and spectroscopic observations of the extraordinary gamma-ray burst (GRB) 221009A in search an associated supernova. Some past GRBs have shown bumps optical light curve that coincide with emergence supernova spectral features, but we do not detect any significant features GRB~221009A, nor clear sign features. Using two well-studied GRB-associated supernovae (SN~2013dx, $M_{r,max} = -19.54$; SN~2016jca, -19.04$) at a similar redshift as GRB~221009A ($z=0.151$), modeled...
Abstract We present photometric and spectroscopic data of SN 2018lab, a low-luminosity Type IIP supernova (LLSN) with V -band peak luminosity −15.1 ± 0.1 mag. 2018lab was discovered by the Distance Less Than 40 Mpc (DLT40) survey only 0.73 days post-explosion, as determined observations from Transiting Exoplanet Survey Satellite (TESS). TESS yield densely sampled, fast-rising, early-time light curve likely powered ejecta–circumstellar medium (CSM) interaction. The blueshifted, broadened...
Abstract We present high-cadence photometric and spectroscopic observations of SN 2023axu, a classical Type II supernova with an absolute V -band peak magnitude –17.2 ± 0.1 mag. 2023axu was discovered by the Distance Less Than 40 Mpc (DLT40) survey within 1 day last nondetection in nearby galaxy NGC 2283 at 13.7 Mpc. modeled early light curve using recently updated shock cooling model that includes effects line blanketing found explosion epoch to be MJD 59971.48 0.03 probable progenitor red...
Abstract We present high-cadence optical and ultraviolet (UV) observations of the Type II supernova (SN), SN 2022jox which exhibits early spectroscopic high-ionization flash features H i , He ii C iv N that disappear within first few days after explosion. was discovered by Distance Less Than 40 Mpc survey ∼0.75 day explosion with follow-up spectra UV photometry obtained minutes discovery. The reached a peak brightness M V ∼ −17.3 mag, has an estimated 56 Ni mass 0.04 ⊙ typical values for...
Abstract We present a JWST mid-infrared (MIR) spectrum of the underluminous Type Ia Supernova (SN Ia) 2022xkq, obtained with medium-resolution spectrometer on Mid-Infrared Instrument (MIRI) ∼130 days post-explosion. identify first MIR lines beyond 14 μ m in SN observations. find features unique to SNe Ia, including following: isolated emission stable Ni, strong blends [Ti ii ], and large ratios singly ionized doubly species both [Ar] [Co]. Comparisons normal-luminosity spectra at similar...
We present high-cadence optical and ultraviolet light curves of the normal Type Ia supernova (SN) 2021aefx, which shows an early bump during first two days observation. This may be a signature interaction between exploding white dwarf nondegenerate binary companion, or it intrinsic to explosion mechanism. In case former, short duration implies relatively compact main-sequence companion star, although this conclusion is viewing-angle dependent. Our best-fit companion-shocking...
We present high-cadence optical, ultraviolet (UV), and near-infrared data of the nearby ($D\approx23$ Mpc) Type II supernova (SN) 2021yja. Many SNe show signs interaction with circumstellar material (CSM) during first few days after explosion, implying that their red supergiant (RSG) progenitors experience episodic or eruptive mass loss. However, because it is difficult to discover early, diversity CSM configurations in RSGs has not been fully mapped. SN 2021yja, detected within...
Abstract We present a comprehensive multi-epoch photometric and spectroscopic study of SN 2024bch, nearby (19.9 Mpc) Type II supernova (SN) with prominent early high-ionization emission lines. Optical spectra from 2.8 days after the estimated explosion reveal narrow lines H i , He ii C iv N that disappear by day 6. High-cadence photometry ground Transiting Exoplanet Survey Satellite show brightened quickly reached peak M V ~ −17.8 mag within week explosion, late-time suggests 56 Ni mass...
We investigate the spectroscopic characteristics of intermediate-luminosity Red Transients (ILRTs), a class elusive objects with peak luminosity between that classical novae and standard supernovae. Our goal is to provide stepping stone in path unveiling physical origin these events based on analysis collected datasets. present extensive optical near-infrared (NIR) monitoring four ILRTs, namely NGC 300 2008OT-1, AT 2019abn, 2019ahd 2019udc. First we focus evolution most prominent spectral...
We investigate the photometric characteristics of a sample intermediate-luminosity red transients (ILRTs), class elusive objects with peak luminosity between that classical novae and standard supernovae. Our goal is to provide stepping stone in path reveal physical origin such events, thanks analysis datasets collected. present multi-wavelength follow-up four ILRTs, namely NGC 300 2008OT-1, AT 2019abn, 2019ahd, 2019udc. Through modelling their spectral energy distribution bolometric light...
Abstract We present supernova (SN) 2023ufx, a unique Type IIP SN with the shortest known plateau duration ( t PT ∼ 47 days), luminous V -band peak M = −18.42 ± 0.08 mag), and rapid early decline rate s 1 3.47 0.09 mag (50 days) −1 ). By comparing observed photometry to hydrodynamic MESA+STELLA model grid, we constrain progenitor be massive red supergiant ZAMS 19–25 ⊙ . Independent comparisons nebular spectral models also suggest an initial He-core mass of ∼6 , thus progenitor. For IIP,...
Abstract We present multi-epoch optical spectropolarimetric and imaging polarimetric observations of the nearby Type II supernova (SN) 2023ixf discovered in M101 at a distance 6.85 Mpc. The first were taken +2.33 days (60085.08 MJD) after explosion, while last data points (+73.19 +76.19 days) acquired fall from light-curve plateau. At there is strong evidence circumstellar material (CSM) interaction spectra light curve. A significant level intrinsic polarization p r = 1.02% ± 0.07% seen...
The Hubble Space Telescope photometric survey of Galactic globular clusters (GCs) has revealed a peculiar "chromosome map" for NGC6934. Besides typical sequence, similar to that observed in Type I GCs, NGC 6934 displays additional stars on the red side, analogous anomalous, II as defined our previous work. We present chemical abundance analysis four giants this GC. Two are located chromosome map sequence common all and another two sequence. find: (i) star-to-star Fe variations, with...
Abstract We present the Gravitational Wave (GW) Treasure Map, a tool to coordinate, visualize, and assess electromagnetic (EM) followup of GW events. With typical localization regions hundreds thousands square degrees dozens active follow-up groups, pursuit EM counterparts is challenging endeavor, but scientific payoff for early discovery any counterpart clear. this tool, we provide website an application programming interface (API) that allows users easily see where other groups have...
We report on analysis using the James Webb Space Telescope (JWST) to identify a candidate progenitor star of Type II-plateau supernova SN 2022acko in nearby, barred spiral galaxy NGC 1300. To our knowledge, discovery represents first time JWST has been used localize system pre-explosion archival Hubble (HST) images. astrometrically registered NIRCam image from 2023 January, which was serendipitously captured, pre-SN HST F160W and F814W images 2017 2004, respectively. An object corresponding...
The Cygnus OB2 Association is one of the nearest and largest collections massive stars in Galaxy. Situated at heart "Cygnus X" complex star-forming regions molecular clouds, its distance has proven elusive owing to ambiguous nature kinematic distances along this ℓ ≃ 80° sightline heavy, patchy extinction. In an effort refine three-dimensional geometry key X constituents, we have measured four eclipsing double-lined OB-type spectroscopic binaries that are probable members Cyg OB2. We find...
Hydrogen-rich, core-collapse supernovae are typically divided into four classes: IIP, IIL, IIn, and IIb. In general, interaction with circumstellar material is only considered for Type IIn supernovae. However, recent hydrodynamic modeling of IIP IIL requires to reproduce their early light curves. this scenario, experience large amounts mass loss before exploding. We test hypothesis on ASASSN-15oz, a supernova. With extensive follow-up in the X- ray, UV, optical, IR, radio we present our...
Abstract We present very early photometric and spectroscopic observations of the Type Ia supernova (SN Ia) 2023bee, starting about 8 hr after explosion, which reveal a strong excess in optical nearest UV ( U UVW1 ) bands during first several days explosion. This data set allows us to probe nature binary companion exploding white dwarf conditions leading its ignition. find good match Kasen model main-sequence star stings ejecta with shock as they buzz past. Models double detonations, shells...