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A list of all the posts and pages found on the site. For you robots out there is an XML version available for digesting as well.
Pages
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Posts
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Blog Post number 4
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Blog Post number 1
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coauthorpubs
Near-infrared and Optical Observations of Type Ic SN 2020oi and Broad-lined Type Ic SN 2020bvc: Carbon Monoxide, Dust, and High-velocity Supernova Ejecta
Published in The Astrophysical Journal, 2021
We present NIR and optical spectroscopy of SN Ic 2020oi and SN Ic-bl 2020bvc. The NIR spectrum of SN2020oi shows clear CO emission and is the first such dust detection for an SN Ic. SN2020bvc exhibits extremely high ejecta velocities consistent with SN-GRBs despite the lack of observed GRB.
Recommended citation: Rho, Jeonghee; et al. (2021). https://ui.adsabs.harvard.edu/abs/2021ApJ...908..232R/abstract
Dalek: A Deep Learning Emulator for TARDIS
Published in The Astrophysical Journal Letters, 2021
We present DALEK, a neural network based emulator for the TARDIS radiative transfer code. DALEK can predict the output of TARDIS (synthetic spectra) to extremely high accuracy. A single DALEK evalution takes only milliseconds compared to thousands of seconds for a full TARDIS simulation, thus unlocking the ability to evaluate millions of TARDIS in mere hours.
Recommended citation: Kerzendorf, Wolfgang; et al. (2021). https://ui.adsabs.harvard.edu/abs/2021ApJ...910L..23K/abstract
The Exotic Type Ic Broad-lined Supernova SN 2018gep: Blurring the Line between Supernovae and Fast Optical Transients
Published in The Astrophysical Journal, 2021
We present optical and UV data on SN2018gep, a supernova that exhibited a fast rise with blue, featureless spectra until after peak light, when the spectra developed broad features typically seen in SNe Ic-bl. Significant blue excess flux is observed compared to other stripped SNe.
Recommended citation: Pritchard, Tyler; et al. (2021). https://ui.adsabs.harvard.edu/abs/2021ApJ...915..121P/abstract
Probabilistic Reconstruction of Type Ia Supernova SN 2002bo
Published in The Astrophysical Journal Letters, 2021
We present the first application of the DALEK emulator-assisted TARDIS modeling framework to fit models to the SN Ia 2002bo. Posterior distributions over model parameters like elemental abundances are produced and comparisons are made to hydrodynamical models of different types of SN Ia explosion mechanisms.
Recommended citation: OBrien, John; et al. (2021). https://ui.adsabs.harvard.edu/abs/2021ApJ...916L..14O/abstract
ASASSN-14lp: two possible solutions for the observed ultraviolet suppression
Published in MNRAS, 2021
We present UV spectroscopy and corresponding radiative transfer models using TARDIS of the normal SN Ia ASASSN-14lp which exhibits suppressed UV flux in its spectra. Models suggest that this UV suppression may be due to high levels of Ni56 mixing in the ejecta.
Recommended citation: Barnabas, Barna; et al. (2022). https://ui.adsabs.harvard.edu/abs/2021MNRAS.506..415B/abstract
The Diverse Properties of Type Icn Supernovae Point to Multiple Progenitor Channels
Published in The Astrophysical Journal, 2022
We present a sample of SN Icn supernova spectra. SN Icn are a newly discovered supernova class showing evidence of interaction with H and He poor CSM. This sample highlights the range of spectral behaviors observed.
Recommended citation: Pellegrino, Craig; et al. (2022). https://ui.adsabs.harvard.edu/abs/2022arXiv220507894P/abstract
Early-time Ultraviolet Spectroscopy and Optical Follow-up Observations of the Type IIP Supernova 2021yja
Published in The Astrophysical Journal, 2022
This paper presents early time ultraviolet and optical spectra of the nearby SN IIP 2021yja. We the radiative transfer code TARDIS to model the spectra and constrain the ejecta velocity structure, extinction, and metallicity.
Recommended citation: Vasylyev, Sergiy; et al. (2022). https://ui.adsabs.harvard.edu/abs/2022ApJ...934..134V/abstract
StaNdaRT: A repository of standardized test models and outputs for supernova radiative transfer
Published in Astronomy & Astrophysics, 2022
This paper presents the first large-scale code comparison between many of the most commonly used supernova radiative transfer codes.
Recommended citation: Blondin, Stephane; et al. (2022). https://ui.adsabs.harvard.edu/abs/2022arXiv220911671B/abstract
portfolio
Portfolio item number 1
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Portfolio item number 2
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publications
Optimal Classification and Outlier Detection for Stripped-envelope Core-collapse Supernovae
Published in The Astrophysical Journal, 2019
This paper presents the SESNPCA code, a public spectral classifier for stripped supernovae.
Recommended citation: Williamson, Marc, Maryam Modjaz, and Federica B. Bianco. "Optimal classification and outlier detection for stripped-envelope core-collapse supernovae." The Astrophysical Journal Letters 880.2 (2019): L22. https://ui.adsabs.harvard.edu/abs/2019ApJ...880L..22W/abstract
Modelling Type Ic Supernovae with TARDIS: Hidden Helium in SN 1994I?
Published in The Astrophysical Journal, 2021
This paper places an upper limit of 0.05 solar masses on the Helium content in the ejecta of stripped supernova 1994I using radiative transfer modeling.
Recommended citation: Williamson, Marc, Wolfgang Kerzendorf, and Maryam Modjaz. "Modeling Type Ic Supernovae with tardis: Hidden Helium in SN 1994I?." The Astrophysical Journal 908.2 (2021): 150. https://ui.adsabs.harvard.edu/abs/2021ApJ...908..150W/abstract
Ultraviolet Spectroscopy and TARDIS Models of the Broad-lined Type-Ic Supernova 2014ad
Published in The Astrophysical Journal, 2022
This paper presents radiative transfer models of the SN Ic-bl 2014ad along with UV and NIR spectra.
Recommended citation: Kwok, Lindsey A., Williamson, Marc et al. "Ultraviolet Spectroscopy and TARDIS Models of the Broad-lined Type-Ic Supernova 2014ad." arXiv preprint arXiv:2204.03716 (2022). https://ui.adsabs.harvard.edu/abs/2022arXiv220403716K/abstract
talks
Talk 1 on Relevant Topic in Your Field
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Conference Proceeding talk 3 on Relevant Topic in Your Field
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This is a description of your conference proceedings talk, note the different field in type. You can put anything in this field.
teaching
Course Instructor PHYS 91SI–Practical Computing for Scientists
Undergraduate, Stanford University, 2014
As an undergraduate student, I was a course instructor for the student designed and taught course Physics 91SI. This was a for-credit course offered by the Stanford physics department and highly recommended by professors to undergraduates interested in joining their labs and beginning research. The curriculum of the course was a combination of programming and data science in order to give students the foundational skills to conduct research. My duties included syllabus design, lecturing, homework design, office hours, and mentoring for the final projects. The syllabus is archived here.
Graduate TA
Undergraduate & Graduate courses, New York University, 2016
During my PhD I was a TA for 5 courses at both the undergrad and graduate levels between 2016 and 2019:
- Introductory Electronics Laboratory (undergrad)
- Introductory Thermodynamics (undergrad, twice)
- Mathematical Methods for Physicists (undergrad)
- Computational Physics (graduate)
Each course required different management based on the student and instructor needs including experimental setup, homework design and solutions, exam design and solutions, supplemental lectures, and office hours.