Search Results - "Derkacy, James"
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SN 2019ehk: A Double-peaked Ca-rich Transient with Luminous X-Ray Emission and Shock-ionized Spectral Features
Published in The Astrophysical journal (01-08-2020)“…We present panchromatic observations and modeling of the Calcium-rich supernova (SN) 2019ehk in the star-forming galaxy M100 (d 16.2 Mpc) starting 10 hr after…”
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Direct analysis of the broad-line SN 2019ein: connection with the core-normal SN 2011fe
Published in Monthly notices of the Royal Astronomical Society (01-05-2023)“…ABSTRACT Type Ia supernovae (SNe Ia) are important cosmological probes and contributors to galactic nucleosynthesis, particularly of the iron group elements…”
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3
SN 2018zd: an unusual stellar explosion as part of the diverse Type II Supernova landscape
Published in Monthly notices of the Royal Astronomical Society (01-10-2020)“…ABSTRACT We present extensive observations of SN 2018zd covering the first ∼450 d after the explosion. This SN shows a possible shock-breakout signal ∼3.6 h…”
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Observations of SN 2017ein Reveal Shock Breakout Emission and a Massive Progenitor Star for a Type Ic Supernova
Published in The Astrophysical journal (01-02-2019)“…We present optical and ultraviolet observations of nearby Type Ic supernova (SN Ic) SN 2017ein, as well as a detailed analysis of its progenitor properties…”
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Evaluating the Consistency of Cosmological Distances Using Supernova Siblings in the Near-infrared
Published in The Astrophysical journal (01-04-2024)“…Abstract The study of supernova (SN) siblings, supernovae with the same host galaxy, is an important avenue for understanding and measuring the properties of…”
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Extrapolation of Type Ia Supernova Spectra into the Near-infrared Using Principal Component Analysis
Published in The Astrophysical journal (01-05-2024)“…Abstract We present a method of extrapolating the spectroscopic behavior of Type Ia supernovae (SNe Ia) in the near-infrared (NIR) wavelength regime up to 2.30…”
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Ultraviolet Line Identifications and Spectral Formation Near Max Light in Type Ia Supernova 2011fe
Published in The Astrophysical journal (01-09-2020)“…We present ultraviolet line identifications of near maximum-light Hubble Space Telescope observations of SN 2011fe using synthetic spectra generated from both…”
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SN 2019va: a Type IIP Supernova with Large Influence of Nickel-56 Decay on the Plateau-phase Light Curve
Published in Monthly notices of the Royal Astronomical Society (01-07-2022)“…ABSTRACT We present multiband photometric and spectroscopic observations of the type II supernova, (SN) 2019va, which shows an unusually flat plateau-phase…”
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A JWST Near- and Mid-infrared Nebular Spectrum of the Type Ia Supernova 2021aefx
Published in Astrophysical journal. Letters (01-02-2023)“…Abstract We present JWST near-infrared (NIR) and mid-infrared (MIR) spectroscopic observations of the nearby normal Type Ia supernova (SN) SN 2021aefx in the…”
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SN 2022acko: The First Early Far-ultraviolet Spectra of a Type IIP Supernova
Published in Astrophysical journal. Letters (01-08-2023)“…Abstract We present five far- and near-ultraviolet spectra of the Type II plateau supernova, SN 2022acko, obtained 5, 6, 7, 19, and 21 days after explosion,…”
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Fast and not-so-furious: Case study of the fast and faint Type IIb SN 2021bxu
Published in Monthly notices of the Royal Astronomical Society (04-07-2023)“…ABSTRACT We present photometric and spectroscopic observations and analysis of SN 2021bxu (ATLAS21dov), a low-luminosity, fast-evolving Type IIb supernova…”
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SN 2017hpa: A Nearby Carbon-rich Type Ia Supernova with a Large Velocity Gradient
Published in The Astrophysical journal (01-03-2021)“…Abstract We present extensive, well-sampled optical and ultraviolet photometry and optical spectra of the Type Ia supernova (SN Ia) 2017hpa. The light curves…”
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Serendipitous Nebular-phase JWST Imaging of SN Ia SN 2021aefx: Testing the Confinement of 56Co Decay Energy
Published in Astrophysical journal. Letters (01-02-2023)“…We present new 0.3–21 μm photometry of SN 2021aefx in the spiral galaxy NGC 1566 at +357 days after B-band maximum, including the first detection of any Type…”
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Seeing Double: ASASSN-18bt Exhibits a Two-component Rise in the Early-time K2 Light Curve
Published in The Astrophysical journal (01-01-2019)“…On 2018 February 4.41, the All-Sky Automated Survey for SuperNovae (ASAS-SN) discovered ASASSN-18bt in the K2 Campaign 16 field. With a redshift of z = 0.01098…”
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Ground-based and JWST Observations of SN 2022pul. I. Unusual Signatures of Carbon, Oxygen, and Circumstellar Interaction in a Peculiar Type Ia Supernova
Published in The Astrophysical journal (01-01-2024)“…Abstract Nebular-phase observations of peculiar Type Ia supernovae (SNe Ia) provide important constraints on progenitor scenarios and explosion dynamics for…”
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Ground-based and JWST Observations of SN 2022pul. II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type Ia Supernova
Published in The Astrophysical journal (01-05-2024)“…Abstract We present an analysis of ground-based and JWST observations of SN 2022pul, a peculiar “03fg-like” (or “super-Chandrasekhar”) Type Ia supernova (SN…”
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Strong Carbon Features and a Red Early Color in the Underluminous Type Ia SN 2022xkq
Published in The Astrophysical journal (01-01-2024)“…Abstract We present optical, infrared, ultraviolet, and radio observations of SN 2022xkq, an underluminous fast-declining Type Ia supernova (SN Ia) in NGC 1784…”
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Ground-based and JWST Observations of SN 2022pul. II. Evidence from Nebular Spectroscopy for a Violent Merger in a Peculiar Type Ia Supernova
Published in The Astrophysical journal (30-04-2024)“…Abstract We present an analysis of ground-based and JWST observations of SN 2022pul, a peculiar “03fg-like” (or “super-Chandrasekhar”) Type Ia supernova (SN…”
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Serendipitous Nebular-phase JWST Imaging of SN Ia SN 2021aefx: Testing the Confinement of 56 Co Decay Energy
Published in Astrophysical journal. Letters (01-02-2023)“…Abstract We present new 0.3–21 μ m photometry of SN 2021aefx in the spiral galaxy NGC 1566 at +357 days after B -band maximum, including the first detection of…”
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20
Direct Analysis of the Broad-Line SN 2019ein: Connection with the Core-Normal SN 2011fe
Published 19-03-2023“…Type Ia supernovae (SNe Ia) are important cosmological probes and contributors to galactic nucleosynthesis, particularly of the iron group elements. To improve…”
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