Sierra A. Dodd
A5059777027- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- CCD and CMOS Imaging Sensors
- Advanced Semiconductor Detectors and Materials
- Technology Assessment and Management
- Nuclear Physics and Applications
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
University of California, Santa Cruz
2021-2023
University of Washington
2022
University of Copenhagen
2021
California Institute of Technology
2013
Time domain science has undergone a revolution over the past decade, with tens of thousands new supernovae (SNe) discovered each year. However, several observational domains, including SNe within days or hours explosion and faint, red transients, are just beginning to be explored. Here, we present Young Supernova Experiment (YSE), novel optical time-domain survey on Pan-STARRS telescopes. Our is designed obtain well-sampled $griz$ light curves for transient events up $z \approx 0.2$. This...
Abstract Active galactic nuclei (AGN) can vary significantly in their rest-frame optical/UV continuum emission, and with strong associated changes broad line on much shorter timescales than predicted by standard models of accretion disks around supermassive black holes. Most such changing-look or changing-state AGN—and at higher luminosities, quasars (CLQs)—have been found via spectroscopic follow-up known showing photometric variability. The Time Domain Spectroscopic Survey the Sloan...
We present the Young Supernova Experiment Data Release 1 (YSE DR1), comprised of processed multi-color Pan-STARRS1 (PS1) griz and Zwicky Transient Facility (ZTF) gr photometry 1975 transients with host-galaxy associations, redshifts, spectroscopic/photometric classifications, additional data products from 2019 November 24 to 2021 December 20. YSE DR1 spans discoveries observations young fast-rising supernovae (SNe) that persist for over a year, redshift distribution reaching z~0.5. relative...
Abstract The effect of tidal forces on transport within a relic accretion disk in binary black holes is studied here with suite two-dimensional hydrodynamic simulations. As the contracts owing to emission gravitational waves, truncated, and two-armed spiral wave excited, which remains stationary rotating reference frame coalescing binary. Such waves lead increased mass angular momentum. Our findings suggest that even case weakly ionized disks density will drain long before orbit two decays...
We present panchromatic observations and modeling of calcium-strong supernovae (SNe) 2021gno in the star-forming host galaxy NGC 4165 (D = 30.5 Mpc) 2021inl outskirts elliptical 4923 80 Mpc), both monitored through Young Supernova Experiment (YSE) transient survey. The multi-color light curves SNe show two peaks, former peak being derived from shock cooling emission (SCE) and/or interaction with circumstellar material (CSM). primary SN is coincident luminous, rapidly decaying X-ray ($L_x 5...
Tidal disruption events (TDEs) provide a unique opportunity to probe the stellar populations around supermassive black holes (SMBHs). By combining light curve modeling with spectral line information and knowledge about in host galaxies, we are able constrain properties of disrupted star for three TDEs. The TDEs our sample have UV spectra, measurements N III C ratios enabled estimates nitrogen-to-carbon abundance these events. We show that measured nitrogen widths consistent originating from...
We study the properties of host galaxies Changing-Look Active Galactic Nuclei (CL AGNs) with aim understanding conditions responsible for triggering CL activity. find that AGN hosts primarily reside in so-called green valley is located between spiral-like star-forming and dead ellipticals, implying AGNs are activated during distinct periods quenching galaxy transformation processes. have low asymmetry indicators, suggesting secular evolutionary processes (the influence bars spirals, possibly...
Abstract We study the properties of galaxies hosting mid-infrared outbursts in context a catalog 500,000 from Sloan Digital Sky Survey. find that nuclear obscuration, as inferred by surrounding dust mass, does not correlate with host galaxy type, stellar (e.g., total mass and mean age), or extinction estimated Balmer decrement. This implies obscuration may be able to explain any overrepresentation tidal disruption events particular galaxies. identify region parameter space contains all...
The Nuclear Spectroscopic Telescope Array (NuSTAR) is a National Aeronautics and Space Administration (NASA) Small Explorer mission that carried the first focusing hard X-ray (6-79 keV) telescope into orbit. It was launched on Pegasus rocket low-inclination Earth orbit June 13, 2012, from Reagan Test Site, Kwajalein Atoll. NuSTAR will carry out two-year primary science mission. observatory composed of instrument spacecraft. spacecraft three-axis stabilized with single articulating solar...
We present panchromatic observations and modeling of calcium-strong supernovae (SNe) 2021gno in the star-forming host galaxy NGC 4165 (D = 30.5 Mpc) 2021inl outskirts elliptical 4923 80 Mpc), both monitored through Young Supernova Experiment (YSE) transient survey. The multi-color light curves SNe show two peaks, former peak being derived from shock cooling emission (SCE) and/or interaction with circumstellar material (CSM). primary SN is coincident luminous, rapidly decaying X-ray ($L_x 5...
We study the properties of galaxies hosting mid-infrared outbursts in context a catalog five hundred thousand from Sloan Digital Sky Survey. find that nuclear obscuration, as inferred by surrounding dust mass, does not correlate with host galaxy type, stellar (e.g. total mass and mean age), or extinction estimated Balmer decrement. This implies obscuration may be able to explain any over-representation tidal disruption events particular galaxies. identify region parameter space contains all...
We present the Young Supernova Experiment Data Release 1 (YSE DR1), comprised of processed multi-color Pan-STARRS1 (PS1) griz and Zwicky Transient Facility (ZTF) gr photometry 1975 transients with host-galaxy associations, redshifts, spectroscopic/photometric classifications, additional data products from 2019 November 24 to 2021 December 20. YSE DR1 spans discoveries observations young fast-rising supernovae (SNe) that persist for over a year, redshift distribution reaching z~0.5. relative...