Intro

Education: Ph.D.: University of Washington (2021), B.A.: Wesleyan University (2015)

Research Interests: Massive stars, stellar populations, time domain studies

Publications: ADS Author Query

About Me: I am a postdoctoral scholar at the University of Washington, where I also received my Ph.D. in August, 2021. My research interests are broad, spanning a multitude of methods — from stellar population synthesis to machine learning — that I use to to study the evolution of massive stars. On this site, you can learn more about my research, or see what I do outside of astronomy. If you'd like to reach out with a question, or to have me give a talk at your institution, please see my contact info.

Research

Massive stars represent the extremes of stellar evolution, and are the sites of exotic physical processes that shape the Universe. Their short lifetimes and intrinsic rarity make them a unique challenge to study. I use a mix of focused single-object studies, cutting-edge stellar population modelling, and techniques borrowed from Big Data to better understand these stellar behemoths.

I am currently working on a number of projects using data from the TESS mission to characterize microvariability in evolved massive stars. Recently, my team discovered a new class of pulsating yellow supergiant, that we are calling "FYPS": Fast Yellow Pulsating Supergiants. We also found that yellow supergiants exhibit stochastic low frequency variability (SLFV), that may be attributable to internal gravity waves.

From Dorn-Wallenstein et al. (2020): Hertzprung-Russel Diagram of 76 cool supergiants, where each point has been replaced by its periodogram calculated from TESS lightcurves after dividing out the SLFV signal. Regions of known variability are highlighted. Five stars with strong peaks in their periodograms are highlighted in green, and are not associated with any known class of variables. We dub this new class FYPS. See the discovery paper for more details.

Contact

If you have any questions about my work, feel free to reach out. I am also available to speak at your institution, and am always happy to give public outreach talks.

Email:

tzdw@uw.edu

Address:

3910 15th Ave NE, C319
Seattle, WA 98195-0002

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