V. Nystrom
A5086925528- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Atmospheric Ozone and Climate
- Ionosphere and magnetosphere dynamics
- Adaptive optics and wavefront sensing
- Solar and Space Plasma Dynamics
- Pulsars and Gravitational Waves Research
- Earthquake Detection and Analysis
Laboratory for Atmospheric and Space Physics
2018
University of Colorado Boulder
2018
On 2018 Feb. 4.41, the All-Sky Automated Survey for SuperNovae (ASAS-SN) discovered ASASSN-18bt in K2 Campaign 16 field. With a redshift of z=0.01098 and peak apparent magnitude B_{max}=14.31, is nearest brightest SNe Ia yet observed by Kepler spacecraft. Here we present discovery ASASSN-18bt, light curve, pre-discovery data from ASAS-SN Asteroid Terrestrial-impact Last Alert System (ATLAS). The early-time curve has an unprecedented 30-minute cadence photometric precision SN~Ia it...
We present an exquisite, 30-min cadence Kepler (K2) light curve of the Type Ia supernova (SN Ia) 2018oh (ASASSN-18bt), starting weeks before explosion, covering moment explosion and subsequent rise, continuing past peak brightness. These data are supplemented by multi-color Pan-STARRS1 CTIO 4-m DECam observations obtained within hours explosion. The K2 has unusual two-component shape, where flux rises with a steep linear gradient for first few days, followed quadratic rise as seen typical...
Abstract Nonlinear interactions involving Kelvin waves with (periods, zonal wave numbers) = (3.7d, s =− 1) (UFKW1) and (2.4d, (UFKW2) 0 1 quasi 9 day (Q9DW) diurnal tides DW1, DW2, DW3, DE2, DE3 are explored within a National Center for Atmospheric Research (NCAR) thermosphere‐ionosphere‐mesosphere electrodynamics general circulation model (TIME‐GCM) simulation driven at its ∼30 km lower boundary by interpolated 3‐hourly output from Modern‐Era Retrospective Analysis Applications (MERRA). The...