G. H. Marion
A5059185329- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Neutrino Physics Research
- Mitochondrial Function and Pathology
- Spectroscopy Techniques in Biomedical and Chemical Research
- Astrophysics and Star Formation Studies
- High-pressure geophysics and materials
- Adaptive optics and wavefront sensing
- CCD and CMOS Imaging Sensors
- Planetary Science and Exploration
- Spacecraft and Cryogenic Technologies
- Communism, Protests, Social Movements
- Particle Detector Development and Performance
- Intelligence, Security, War Strategy
- Particle accelerators and beam dynamics
- Influenza Virus Research Studies
The University of Texas at Austin
2015-2024
Center for Astrophysics Harvard & Smithsonian
2011-2017
Harvard University Press
2011-2015
University of Hawaii System
2015
Harvard University
2014
Texas A&M University
2009-2011
Mitchell Institute
2011
National Aeronautics and Space Administration
2003
Fermi National Accelerator Laboratory
1998
University of Chicago
1998
We describe observed properties of the Type Iax class supernovae (SNe Iax), consisting SNe observationally similar to its prototypical member, SN 2002cx. The currently has 25 members, and we present optical photometry and/or spectroscopy for most them. are spectroscopically Ia, but have lower maximum-light velocities (2000 ≲ |v| 8000 km s−1), typically peak magnitudes (−14.2 ⩾ MV, ≳ −18.9 mag), hot photospheres. Relative low luminosities their light-curve shape. There is a correlation...
In the past decade, several rapidly evolving transients have been discovered whose timescales and luminosities are not easily explained by traditional supernovae (SNe) models. The sample size of these objects has remained small due, at least in part, to challenges detecting short timescale with survey cadences. Here we present results from a search within Pan-STARRS1 Medium Deep Survey (PS1-MDS) for luminous transients. We identify 10 new time above half-maximum (t1/2) less than 12 days...
We present optical spectroscopy and optical/near-IR photometry of 31 host galaxies hydrogen-poor superluminous supernovae (SLSNe), including 15 events from the Pan-STARRS1 Medium Deep Survey. Our sample spans redshift range 0.1 ≲ z 1.6, is first comprehensive galaxy study this specific subclass cosmic explosions. Combining multi-band emission-line measurements, we determine luminosities, stellar masses, star formation rates, metallicities. find that, as a whole, hosts SLSNe are...
We present griz light curves of 146 spectroscopically confirmed Type Ia Supernovae ($0.03 < z <0.65$) discovered during the first 1.5 years Pan-STARRS1 Medium Deep Survey. The natural photometric system is determined by a combination on-site measurements instrument response function and observations spectrophotometric standard stars. find that systematic uncertainties in are currently 1.2\% without accounting for uncertainty HST Calspec definition AB system. A Hubble diagram constructed with...
The double explosion of SN 2009ip in 2012 raises questions about our understanding the late stages massive star evolution. Here we present a comprehensive study during its remarkable rebrightenings. High-cadence photometric and spectroscopic observations from GeV to radio band obtained variety ground-based space facilities (including Very Large Array, Swift, Fermi, Hubble Space Telescope, XMM) constrain be low energy (E ∼ 1050 erg for an ejecta mass ∼0.5 M☉) asymmetric complex medium shaped...
HST and ground based observations of the Type IIn SN 2010jl are analyzed, including photometry, spectroscopy in ultraviolet, optical NIR bands, 26-1128 days after first detection. At maximum bolometric luminosity was $\sim 3\times10^{43}$ erg/s even at 850 exceeds $10^{42}$ erg/s. A excess, dominating 400 days, probably originates dust circumstellar medium (CSM). The total radiated energy is $> 6.5\times10^{50}$ ergs, excluding component. spectral lines can be separated into one broad...
The intermediate Palomar Transient Factory reports our discovery of a young supernova, iPTF13bvn, in the nearby galaxy, NGC 5806 (22.5 Mpc). Our spectral sequence optical and infrared suggests Type Ib classification. We identify blue progenitor candidate deep pre-explosion imaging within 2σ error circle 80 mas (8.7 pc). has an MB luminosity −5.52 ± 0.39 mag B − I color 0.25 mag. If confirmed by future observations, this would be first direct detection for Ib. Fitting power law to early light...
We present extensive early photometric (ultraviolet through near-infrared) and spectroscopic (optical data on supernova (SN) 2008D as well X-ray analysis the associated Swift transient (XRT) 080109. Our span a time range of 5 hr before detection to 150 days after its detection, detailed allowed us derive constraints nature SN progenitor; throughout we draw comparisons with results presented in literature find several key aspects that differ. show spectrum XRT 080109 can be fit equally by an...
We present the Pan-STARRS1 discovery of long-lived and blue transient PS1-11af, which was also detected by Galaxy Evolution Explorer with coordinated observations in near-ultraviolet (NUV) band. PS1-11af is associated nucleus an early type galaxy at redshift z = 0.4046 that exhibits no evidence for star formation or active galactic activity. Four epochs spectroscopy reveal a pair broad absorption features UV on otherwise featureless spectra. Despite superficial similarity these to P-Cygni...
We present multi-band optical photometry of 94 spectroscopically confirmed Type Ia supernovae (SNe Ia) in the redshift range 0.0055–0.073, obtained between 2006 and 2011. There are a total 5522 light-curve points. show that our natural-system SN has precision ≲ 0.03 mag BVr'i', 0.06 u', 0.07 U for points brighter than 17.5 estimate it systematic uncertainty 0.014, 0.010, 0.012, 0.046, 0.073 BVr'i'u'U, respectively. Comparisons standard-system with published light curves comparison stars...
We present 645 optical spectra of 73 supernovae (SNe) Types IIb, Ib, Ic, and broad-lined Ic. All these types are attributed to the core collapse massive stars, with varying degrees intact H He envelopes before explosion. The SNe in our sample have a mean redshift 〈cz〉 = 4200 km s−1. Most were gathered at Harvard-Smithsonian Center for Astrophysics (CfA) between 2004 2009. For 53 SNe, first published spectra. data coverage ranges from mere identification (1–3 spectra) few extensive series...
In recent years, wide-field sky surveys providing deep multi-band imaging have presented a new path for indirectly characterizing the progenitor populations of core-collapse supernovae (SN): systematic light curve studies. We assemble set 76 grizy-band Type IIP SN curves from Pan-STARRS1, obtained over constant survey program 4 years and classified using both spectroscopy machine learning-based photometric techniques. develop apply Bayesian model full evolution each in sample. find no...
Supernova (SN) 2009ig was discovered 17 hours after explosion by the Lick Observatory Search, promptly classified as a normal Type Ia SN (SN Ia), peaked at V = 13.5 mag, and equatorial, making it one of foremost supernovae for intensive study in last decade. Here, we present ultraviolet (UV) optical observations 2009ig, starting about 1 day until around maximum brightness. Our data include excellent UV light curves, 25 premaximum spectra, 8 including earliest spectrum ever obtained Ia. is...
We probe the systematic uncertainties from 113 Type Ia supernovae (SNIa) in Pan-STARRS1 (PS1) sample along with 197 SN a combination of low-redshift surveys. The companion paper by Rest et al. (2013) describes photometric measurements and cosmological inferences PS1 sample. largest uncertainty stems calibration low-z samples. increase observed Calspec standards 7 to 10 used define system. SDSS-II systems are compared discrepancies up ~0.02 mag recovered. find proper way treat intrinsic...
We present a densely-sampled, homogeneous set of light curves 64 low redshift (z < 0.05) stripped-envelope supernovae (SN type IIb, Ib, Ic and Ic-bl). These data were obtained between 2001 2009 at the Fred L. Whipple Observatory (FLWO) on Mt. Hopkins in Arizona, with optical FLWO 1.2-m near-infrared PAIRITEL 1.3-m telescopes. Our dataset consists 4543 photometric measurements 61 SN, including combination UBVRI, UBVr'i', u'BVr'i', 2142 JHKs 25 SN. This sample constitutes most extensive...
SN 2014J in M82 is the closest detected Type Ia supernova (SN Ia) at least 28 years and perhaps 410 years. Despite its small distance of 3.3 Mpc, surprisingly faint, peaking V = 10.6 mag, assuming a typical luminosity, we infer an observed visual extinction A_V 2.0 +/- 0.1 mag. But this picture, with R_V 1.6 0.2, too simple to account for all observations. We combine 10 epochs (spanning month) HST/STIS ultraviolet through near-infrared spectroscopy HST/WFC3, KAIT, FanCam photometry from...
ABSTRACT We report evidence for excess blue light from the Type Ia supernova (Sn Ia) SN 2012cg at 15 and 16 days before maximum B -band brightness. The emission is consistent with predictions impact of on a non-degenerate binary companion. This first companion to normal Ia. Sixteen light, <?CDATA $B-V$?> <?MML <mml:math> <mml:mi>B</mml:mi> <mml:mo>−</mml:mo> <mml:mi>V</mml:mi> </mml:math>?> color 0.2 mag bluer than other At later times, this has typical curve, extinction-corrected...
We present UV through NIR broad-band photometry, and optical spectroscopy of Type Iax supernova 2012Z. The data set consists both early late-time observations, including the first late phase spectrum obtained for a spectroscopically classified SN Iax. Simple model calculations its bolometric light curve suggest 2012Z produced ~0.3 M_sun (56)Ni, ejected about Chandrasekhar mass material, had an explosion energy ~10^51 erg, making it one brightest most energetic yet observed. is found to...
Type Ia supernovae (SNe Ia) are more precise standardizable candles when measured in the near-infrared (NIR) than optical. With this motivation, from 2012-2017 we embarked on RAISIN program with Hubble Space Telescope (HST) to obtain rest-frame NIR light curves for a cosmologically distant sample of 37 SN ($0.2 \lesssim z 0.6$) discovered by Pan-STARRS and Dark Energy Survey. By comparing higher-$z$ HST data 42 at $z<0.1$ observed Carnegie Supernova Project, construct diagram observations...
One of the major differences between various explosion scenarios Type Ia supernovae (SNe Ia) is remaining amount unburned (C+O) material and its velocity distribution within expanding ejecta. While oxygen absorption features are not uncommon in spectra SNe before maximum light, presence strong carbon has been reported only a minority objects, typically during pre-maximum phase. The low frequency detections may be due to signal-to-noise data, abundance material, line blending C II 6580 Si...
The Type Ia supernova (SN Ia) 2013dy in NGC 7250 (d ~ 13.7 Mpc) was discovered by the Lick Observatory Supernova Search. Combined with a prediscovery detection Italian Search Project, we are able to constrain first-light time of SN be only 0.10 +/- 0.05 d (2.4 1.2 hr) before first detection. This makes earliest known an Ia. We infer upper limit on radius progenitor star R_0 < 0.25 R_sun, consistent that white dwarf. light curve exhibits broken power law exponents 0.88 and then 1.80. A...
We present multi-band ultraviolet and optical light curves, as well visual-wavelength near-infrared spectroscopy of the Type II linear (IIL) supernova (SN) 2013by. show that SN 2013by other SNe IIL in literature, after their decline phase start maximum, have a sharp curve similar to seen plateau (IIP) supernovae. This feature has rarely been observed due relative rarity intrinsic faintness this particular curve. suggest presence drop could be used physical parameter distinguish between...
ABSTRACT We present extensive multiwavelength (radio to X-ray) observations of the Type Ib/c supernova (SN Ib/c) SN 2013ge from −13 +457 days relative maximum light, including a series optical spectra and Swift UV–optical photometry beginning 2–4 post-explosion. This data set makes one best-observed normal SNe at early times—when light curve is particularly sensitive progenitor configuration mixing radioactive elements—and reveals two distinct components in UV bands. The first component...