Join us for the Science Speaker Series, hosted by the Physics, Biology and Chemistry departments on select Tuesdays and Thursdays at Noon in the Jim and Linda Lee Planetarium! This series features captivating talks from guest speakers outside ERAU, faculty experts within ERAU and student presentations (REUs or Capstone projects) in the College of Arts and Sciences.
For suggestions, comments or volunteering opportunities, contact Dr. Pragati Pradhan at pradhanp@erau.edu, Dr. Quentin G. Bailey at baileyq@erau.edu or Dr. Steve Waples at steve.waples@erau.edu.
Stay tuned for updates on this event page, or watch out for emails.
Next Event
Capstone Presentation by Two Astronomy Students
When: Nov. 20 at Noon
Where: Jim and Linda Lee Planetarium
Title: A High-Resolution Spectroscopic Campaign During TESS Observations of an Outburst of the Classical Be star λ Pavonis
Speaker: Sola Nova
Abstract: Be stars are non-supergiant, rapidly rotating B stars that have shown emission lines originating in a circumstellar disk. The exact mechanisms that lead to disk formation and dissipation are not fully known although progress has been made with some systems. Here, we present a study of a disk outburst of the southern Be star λ Pavonis (HD 173948). Our dataset comprises 698 high-resolution spectra taken contemporaneously with TESS photometry in June and July 2023. During the final days of two months of TESS monitoring, the star began building a disk from a pristine diskless state. Through equivalent width measurements, we find that the disk built within 5 days in optical H I and He I lines, while the disk is circularized in about 12 days. The disk began to decay in higher energy He I first, then lower energy transitions, with the decay ending last for Hα. We examine non-radial pulsations both through TESS photometry and the line profile variations in two Balmer lines, four He I lines, and the weak photospheric Si III 5739 line. Our analysis of these lines show that two of the periodicities seen in TESS photometry are coherent in the spectral lines before and after the outburst, but not while the disk was building. Furthermore, the periodicity that appears most stable appears as a difference between the two non-stable periods. We also find evidence for fast non-photometric pulsational variations over the course of spectroscopy obtained before, during, and after the outburst.
Title: MCMC Hammering Out Photometric Models of Wolf-Rayet Wind-Eclipsing Binaries
Speaker: Anthony Fabrega
Abstract: Wolf-Rayet stars have strong, ionized stellar winds. In a binary system, an apparent “eclipse” occurs when an OB companion is viewed through the dense, electron-rich WR wind, which scatters and absorbs its light. We present the photometric analysis of a survey of Wolf-Rayet (WR) wind-eclipsing systems using a Markov Chain Monte Carlo light-curve modeling pipeline that we developed. Through inputting accurate orbital parameters, the pipeline applies a physical model to estimate the light-curve profile and determine the photometric orbital inclination and the mass-loss rate for each system. Using recent observations from the Transiting Exoplanet Survey Satellite (TESS), the pipeline has produced results that are comparable to, and in some cases, more tightly constrained than, earlier studies, providing orbital inclinations and WR mass-loss rates for our sample.
Past Events
Discovery of Supernova "H0pe" using the James Webb Space Telescope
Date: Nov. 13, 2025
Venue: Jim and Linda Lee Planetarium
Speaker: Dr. Brenda Frye
Dark Matter Differences Beyond the Milky Way: Mass Modeling the Andromeda Dwarf Galaxies
Date: Oct. 30, 2025
Venue: Jim and Linda Lee Planetarium
Speaker: Connor Pickett
Student REU During Summing 2025
Date: Sept. 18, 2025
Venue: Jim and Linda Lee Planetarium
Speaker 1: Hailey Widger
Title 1: Representation Learning for Galactic Feature Density Estimation
Speaker 2: Em Biegler
Title 2: Testing Thin Film Nanocharacterization via the New WSU X-ray Beamline
The Quest to Explore the Universe With Gravitational Waves
Date: Sept. 4, 2025
Venue: Jim and Linda Lee Planetarium
Speaker: Dr. Marek Szczepańczyk
Capstone Presentations II
Date: April 24, 2025
Venue: Jim and Linda Lee Planetarium
Speaker 1: Sami Garcia Flores
Title 1: Quantifying Outbursts of the Be Star QR Vul
Speaker 2: Hailey Beier
Title 2: Probing the Multiplicity of Dusty, Carbon-Rich Wolf-Rayet Stars With High-Resolution, Near-Infrared Spectroscopy
Speaker 3: Hailey Murray
Title 3: Physics Beyond General Relativity: Spacetime Symmetry Breaking and Black Holes
Speaker 4: Kya Schluterman
Title 4: Distributional Methods for Detecting Gravitational Waves From Core-Collapse Supernovae
Speaker 5: Brandon Pillon
Title 5: Mock Setup of Newtonian Calibration Characterization for Laser Interferometry
Speaker 6: Jacob Anna
Title 6: Correcting the Background Sources Found in the LIGO Interferometer and Data Quality Testing
Speaker 7: Jerome Busquin
Title 7: Ground-Based Contrail Observation
Speaker 8: Quintin B. Weinberger
Title 8: Reaction-Diffusion Systems on Cubic Superlattices
Speaker 9: Charles D. Wszalek
Title 9: Explicit Symmetry-Breaking of D_n-Equivariant Systems
Speaker 10: Isaiah Joy
Title 10: A Quantum Factoring Algorithm
Capstone Presentations I
Date: April 10, 2025
Venue: Jim and Linda Lee Planetarium
Speaker 1: Taylor Brown and Shannon Moore
Title 1: Analyzing the Variability and Orbit of the Massive Binary Eta Carinae
Speaker 2: Jasmine Downing
Title 2: A Spectroscopic Orbit for WR70
Speaker 3: Micaela Henson
Title 3: Imaging the Dusty Environments Around Galactic WC Binaries With JWST
Speaker 4: Katie Casciotti
Title 4: X-ray Insights Into Colliding Wind Binaries: A Comparative Study of WR 25, Gamma2 Vel and Related Systems
Speaker 5: Ryan Totman
Title 5: Voyager Detections of Plasma Oscillation Events Can Be Associated With Neutron Star Production of Gravitational Waves
Speaker 6: Thomas Zanin
Title 6: Quantum Discord of Graviton Detection
Speaker 7: Logan Caudle
Title 7: Energy Calibration in the CCM Detector Using Michel Electrons From Stopping Cosmic Ray Muons
Speaker 8: Jaxson G. Mitchell
Title 8: Coherent States and Coupled Supersymmetry
Finding Space-Time Scars
Date: March 27, 2025
Venue: Jim and Linda Lee Planetarium
Speaker: Michele Zanolin
Research Talks by Physics Faculties II
Date: March 11, 2025
Venue: Jim and Linda Lee Planetarium
Talk 1: Searches for Spacetime Symmetry Breaking
Speaker: Quentin G. Bailey
Talk 2: From Setting National UV Standards to Improving LIGO Sensitivity: Measurement Science and Today’s Cutting-Edge Research
Speaker: Dr. Ellie Gretarsson
Talk 3: How to Hunt Gravitons for Beginners
Speaker: Preston Jones
Talk 4: TBD
Speaker: Dr. Brian Rachford
Talk 5: The Stories Massive Binaries Tell Us About Their Interacting Past
Speaker: Dr. Noel Richardson
Stellar Abundances in the Milky Way (and Beyond) and Their Implications for Nucleosynthesis
Date: Feb. 20, 2025
Venue: Jim and Linda Lee Planetarium
Speaker: Dr. Emily Griffith
NOIRLab: Behind the Scenes
Date: Feb. 6, 2025 — This event has been cancelled
Venue: Jim and Linda Lee Planetarium
Speaker: André-Nicolas Chené
REUs and Beyond During Summer 2024
Date: Jan. 21, 2025
Venue: Jim and Linda Lee Planetarium
Talk 1: How Does Artificially Induced Particle Precipitation From HAARP Influence STEVE Airglow?
Speaker: Hailey Beier
Talk 2: Testing the Resiliency of XENONnT Background Reduction Techniques
Speaker: Taylor Brown
Talk 3: Detections of Superbubble Breakthroughs and Blowouts
Speaker: Katie Casciotti
Talk 4: Improving the Sensitivity of LIGO Searches to Binary Black Hole Signals With Smarter Detection Algorithms
Speaker: Jaxson Mitchell
Talk 5: Photometric Techniques for Analyzing the Light Behavior of Satellites
Speaker: Shannon Moore
Talk 6: Quantum Channel Masking
Speaker: Hailey Murray
Talk 7: Rapid Search for Higher Modes in GW From Compact-Binary-Coalescence
Speaker: Kya Schluterman
Research Talks by Physics Faculties I
Date: Jan. 30, 2025
Venue: Jim and Linda Lee Planetarium
Talk 1: Pattern Formation and Equivariant Bifurcation
Speaker: Tim Callahan
Talk 2: Opportunities in Dr. Smith’s Research Group
Speaker: Dr. Darrel Smith
Talk 3: Hearing Farther Into the Universe
Speaker: Andri Gretarsson
Talk 4: LIGO Detector Characterization
Speaker: BrennanHughey
Talk 5: Beyond What Human Eyes Can See: The Universe in X-rays
Speaker: Dr. Pragati Pradhan
A Guide to Applying to Graduate School
Date: Sept. 19, 2024
Venue: Jim and Linda Lee Planetarium
Speaker: Janessa Sloane, University of Virginia
Weird Binaries Under Close Surveillance: TU Tau and HD 5501
Date: Oct. 3, 2024
Venue: Jim and Linda Lee Planetarium
Speaker: Dr. Christopher Corbally, Jesuit priest of the British Province, emeritus vice director of the Vatican Observatory and an adjunct astronomer at the University of Arizona
Physics Investigations Using the Sensors in Your Phone
Date: Oct. 30, 2024
Venue: Lower Hangar
Speaker: Dr. David Rakestraw, Lawrence Livermore National Laboratory
An ALMA View of the Disks Surrounding the Closest Young Binaries
Date: Nov. 7, 2024
Venue: Jim and Linda Lee Planetarium
Speaker: Dr. Taylor Kutra, Lowell Observatory
Black Holes, Exploding Stars and Clusters of Galaxies: 25 Years With Chandra, NASA's Flagship-Class X-Ray Observatory
Date: Nov. 14, 2024
Venue: Jim and Linda Lee Planetarium
Speaker: Dr. Scott Randall, Senior Astrophysicist and the head of the Chandra Science Operations Team in Mission Planning in the Chandra X-ray Center at the Center for Astrophysics | Harvard & Smithsonian (CfA)