A5076173362- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Noise Effects and Management
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Music Technology and Sound Studies
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Spectroscopy Techniques in Biomedical and Chemical Research
- Multisensory perception and integration
- Forecasting Techniques and Applications
- Spacecraft and Cryogenic Technologies
- Tactile and Sensory Interactions
- Aesthetic Perception and Analysis
Center for Astrophysics Harvard & Smithsonian
2021-2024
Harvard University
2023-2024
University of Arizona
2024
Harvard College Observatory
2023
Harvard University Press
2021
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 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...
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...
Abstract We present an extensive Hubble Space Telescope rest-frame UV imaging study of the locations Type I superluminous supernovae (SLSNe) within their host galaxies. The sample includes 65 SLSNe with detected galaxies in redshift range z ≈ 0.05–2. Using precise astrometric matching SN images, we determine distributions physical and host-normalized offsets relative to centers, as well fractional flux distribution underlying light distributions. find that roughly track exponential disk...
Abstract We present the most comprehensive catalog to date of Type I Superluminous Supernovae (SLSNe), a class stripped envelope supernovae (SNe) characterized by exceptionally high luminosities. have compiled sample 262 SLSNe reported through 2022 December 31. verified spectroscopic classification each SLSN and collated an exhaustive data set UV, optical IR photometry totaling over 30,000 photometric detections. Using these we derive observational parameters such as peak absolute...
Historically, astronomy has prioritized visuals to present information, with scientists and communicators overlooking the critical need communicate astrophysics blind or low-vision audiences provide novel channels for sighted process scientific information. This study sonified NASA data of three astronomical objects presented as aural visualizations, then surveyed individuals elicit feedback on experience these pieces it relates enjoyment, education, trust data. Data analyses from 3,184...
Superluminous supernovae (SLSNe) are luminous transients that can be detected to high redshifts with upcoming optical time-domain surveys such as the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). An interesting open question is whether properties SLSNe evolve through cosmic time. To address this question, in paper we model multi-color light curves all 21 Type I from Dark Energy (DES) a magnetar spin-down engine, implemented Modular Open Source Fitter for Transients...
Abstract With the upcoming Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST), it is expected that only ∼0.1% all transients will be classified spectroscopically. To conduct studies rare transients, such as Type I superluminous supernovae (SLSNe), we must instead rely on photometric classification. In this vein, here carry out a pilot study SLSNe from Pan-STARRS1 Medium Deep (PS1-MDS), photometrically with our SuperRAENN Superphot algorithms. We first construct subsample sample...
We present the largest and deepest late-time radio millimeter survey to date of superluminous supernovae (SLSNe) long duration gamma-ray bursts (LGRBs) search for associated non-thermal synchrotron emission. Using Karl G. Jansky Very Large Array (VLA) Atacama Millimeter/submillimeter (ALMA), we observed 43 sources at 6 100 GHz on a timescale $\sim 1 - 19$ yr post-explosion. do not detect radio/mm emission from any sources, with exception detection PTF10hgi (Eftekhari et al. 2019), as well...
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 $\sim$7 Mpc. The light-curve evolution over first 30 hours can be fit by two power law indices break after 22 hours, rising from $M_V \approx -12.95$ mag +0.66 days to -17.91$ 7 days. In addition, densely sampled color curve shows strong blueward few then behaves as normal redward ejecta cool. Such...
We present the most comprehensive catalog to date of Type I Superluminous Supernovae (SLSNe), a class stripped envelope supernovae (SNe) characterized by exceptionally high luminosities. have compiled sample 262 SLSNe reported through 2022 December 31. verified spectroscopic classification each SLSN and collated an exhaustive data set UV, optical IR photometry from both publicly available our own FLEET observational follow-up program, totaling over 30,000 photometric detections. Using these...
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 curve. A significant level polarization $P_r = 0.88\pm 0.06 \% $ seen during this phase...
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 2.9 days after the estimated explosion reveal narrow lines H I, He II, C IV, N IV that disappear by day 6. High cadence photometry ground TESS show brightened quickly reached peak M$_V \sim$ $-$17.8 mag within week explosion, late-time suggests $^{56}$Ni mass 0.050 M$_{\odot}$....
Fairness research in machine learning often centers on ensuring equitable performance of individual models. However, real-world recommendation systems are built multiple models and even stages, from candidate retrieval to scoring serving, which raises challenges for responsible development deployment. This system-level view, as highlighted by regulations like the EU AI Act, necessitates moving beyond auditing independent entities. We propose a holistic framework modeling fairness, focusing...
We present and analyze the extensive optical broadband photometry of Type II SN 2023ixf up to one year after explosion. find that, when compared two pre-existing model grids, pseudo-bolometric light curve is consistent with drastically different combinations progenitor explosion properties. This may be an effect known degeneracies in IIP light-curve models. independently compute a large grid ${\tt MESA+STELLA}$ single-star models various zero-age main-sequence masses, mass-loss efficiencies,...
We present an extensive $\textit{Hubble Space Telescope}$ ($\textit{HST}$) rest-frame ultraviolet (UV) imaging study of the locations Type I superluminous supernovae (SLSNe) within their host galaxies. The sample includes 65 SLSNe with detected galaxies in redshift range $z\approx 0.05-2$. Using precise astrometric matching SN images, we determine distributions physical and host-normalized offsets relative to centers, as well fractional flux distribution underlying UV light distribution....