Scott Severson

Seeing the Outer Edge of the Infant Type Ia Supernova 2024epr in the Optical and Near Infrared

W. B. Hoogendam, D. O. Jones, C. Ashall, B. J. Shappee et autres

We present optical-to-near-infrared (NIR) photometry and spectroscopy of the Type Ia supernova (SN~Ia) 2024epr, including NIR spectra observed within two days of first light. The early-time optical spectra show strong, high-velocity Ca and Si features near rarely-observed velocities at $ 0.1 c$, …

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Modeling Supernovae as an Optically Thick Fireball

J F Marshall, Scott Severson

We calculate the properties of 135 stellar supernovae using data from the Open Supernova Catalog. We generate temperatures, radii, luminosities, and expansion velocities using a spherically symmetric optically thick fireball model. These modeled parameters reveal trends that are common across different types …

Building Support with your Departmental Colleagues

Brian Thoms, Mel Sabella, Scott Severson

The Sonoma State University Physics Teacher Pipeline

Scott Severson

MEMS practice, from the lab to the telescope

Katie M. Morzinski, Andrew P. Norton, Julia W. Evans, Layra Reza et autres

Micro-electro-mechanical systems (MEMS) technology can provide for deformable mirrors (DMs) with excellent performance within a favorable economy of scale. Large MEMS-based astronomical adaptive optics (AO) systems such as the Gemini Planet Imager are coming on-line soon. As MEMS DM end-users, we discuss …

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Building the Sonoma State University Physics Teacher Pipeline

Scott Severson

World-wide deployment of Robo-AO visible-light robotic laser adaptive optics systems

Christoph Baranec, Reed Riddle, Nicholas M. Law, Jessica R. Lu et autres

KAPAO first light: the design, construction and operation of a low-cost natural guide star adaptive optics system

Scott Severson, P. I. Choi, Katherine Badham, D.E. Bolger et autres

We present the instrument design and first light observations of KAPAO, a natural guide star adaptive optics (AO) system for the Pomona College Table Mountain Observatory (TMO) 1-meter telescope. The KAPAO system has dual science channels with visible and near-infrared cameras, a …

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Performance Characterization of KAPAO, a Low-Cost Natural Guide Star Adaptive Optics Instrument

Joseph D. Long, P. I. Choi, Scott Severson, Erik Littleton et autres

Assembly and First-Light of KAPAO, a Low-Cost Natural Guide Star Adaptive Optics System

Katherine Badham, Scott Severson, P. I. Choi, D.E. Bolger et autres

KAPAO: a MEMS-based natural guide star adaptive optics system

Scott Severson, P. I. Choi, Daniel S. Contreras, B. N. Gilbreth et autres

We describe KAPAO, our project to develop and deploy a low-cost, remote-access, natural guide star adaptive optics (AO) system for the Pomona College Table Mountain Observatory (TMO) 1-meter telescope. We use a commercially available 140-actuator BMC MEMS deformable mirror and a version …

us (code pays fourni par la source)

On-sky Characterization of KAPAO-Alpha, A Prototype Adaptive Optics Instrument

Daniel S. Contreras, Erik Littleton, P. I. Choi, Scott Severson et autres