A5084370895- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
University of Southern California
2021-2024
Carnegie Observatories
2021-2024
Carnegie Institution for Science
2021-2024
Abstract We present ultraviolet/optical/near-infrared observations and modeling of Type II supernovae (SNe II) whose early time ( δ t < 2 days) spectra show transient, narrow emission lines from shock ionization confined r 10 15 cm) circumstellar material (CSM). The observed electron-scattering broadened line profiles (i.e., IIn-like) H i , He i/ii C iv N iii/iv/v the CSM persist on a characteristic timescale IIn ) that marks transition to lower-density emergence Doppler-broadened...
Abstract Shock breakout (SBO), the first expected electromagnetic signature of a supernova (SN), can be an important probe progenitors these explosions. Unfortunately, SBO is difficult to capture with current surveys due its brief timescale (≲1 hr). However, may lengthened when dense circumstellar material (CSM) present. Indeed, recent photometric modeling studies SNe, as well early spectroscopy, suggest that such CSM present more often than previously expected. If true, this should also...
We present ultraviolet/optical/near-infrared observations and modeling of Type II supernovae (SNe II) whose early-time ($\delta t < 2$ days) spectra show transient, narrow emission lines from shock ionization confined ($r 10^{15}$ cm) circumstellar material (CSM). The observed electron-scattering broadened line profiles (i.e., IIn-like) HI, He I/II, C III/IV, N III/IV/V the CSM persist on a characteristic timescale ($t_{\rm IIn}$) that marks transition to lower-density emergence...
We present SN 2023zaw $-$ a sub-luminous ($\mathrm{M_r} = -16.7$ mag) and rapidly-evolving supernova ($\mathrm{t_{1/2,r}} 4.9$ days), with the lowest nickel mass ($\approx0.002$ $\mathrm{M_\odot}$) measured among all stripped-envelope supernovae discovered to date. The photospheric spectra are dominated by broad He I Ca NIR emission lines velocities of $\sim10\ 000 - 12\ 000$ $\mathrm{km\ s^{-1}}$. late-time show prominent narrow at $\sim$1000$\ \mathrm{km\ s^{-1}}$, indicative interaction...
Abstract We present SN 2023zaw—a subluminous ( M r = −16.7 mag) and rapidly evolving supernova t 1/2, 4.9 days), with the lowest nickel mass (≈0.002 ⊙ ) measured among all stripped-envelope supernovae discovered to date. The photospheric spectra are dominated by broad He i Ca near-infrared emission lines velocities of ∼10,000−12,000 km s −1 . late-time show prominent narrow at ∼1000 , indicative interaction He-rich circumstellar material. 2023zaw is located in spiral arm a star-forming...
Abstract Stripped-envelope supernovae (SESNe) are a subclass of core-collapse that deficient in hydrogen (SN IIb, SN Ib) and possibly helium Ic) their spectra. Their progenitors likely stripped this material through combination stellar winds interactions with close binary companion, but the exact ejecta mass range covered by each subtype how it relates to zero-age main-sequence progenitor is still unclear. Using semianalytic modeling numerical simulations, we discuss properties SESN can be...
Abstract Following shock breakout, the emission from an astrophysical explosion is dominated by radiation of shock-heated material as it expands and cools, known cooling (SCE). The luminosity SCE proportional to initial radius emitting material, which makes its measurement useful for investigating progenitors these explosions. Recent observations have shown some transient events especially prominent SCE, indicating a large that potentially due low-mass extended material. Motivated this, we...
Stripped-envelope supernovae (SESNe) are a subclass of core-collapse that deficient in hydrogen (SN~IIb, SN~Ib) and possibly helium (SN~Ic) their spectra. Their progenitors likely stripped this material through combination stellar winds interactions with close binary companion, but the exact ejecta mass ranges covered by each subtype how it relates to zero-age main-sequence progenitor is still unclear. Using semi-analytic modeling numerical simulations, we discuss properties SESN can be...