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<!DOCTYPE html>
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<meta name="description" content="Personal Website for Tom Wagg" />
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<a class="js-scroll-trigger" href="#about">About Me</a>
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<h1 class="mt-auto">Liam Becker</h1>
<h5 class="mb-4">Astrophysics PhD Candidate at the University of Washington</h5>
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<a id="findoutmore" class="btn btn-outline-light js-scroll-trigger mb-4" href="#about">Find Out More</a>
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<h1 class="d-inline-block subtitle mb-4 display-3 text-white" style="margin-left: 30px">About</h1>
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<h3>Linking binary evolution and galactic dynamics</h3>
<p>
I am broadly interested in constraining <b>binary stellar evolution</b>, in particular most recently by using the <b>kinematics</b> of stars and compact objects. With this goal in mind, my PhD thesis focuses on developing, and applying, self-consistent population synthesis and galactic dynamics simulations with a new framework I created called <a href="https://cogsworth.readthedocs.io"><code style="color: black; font-weight: 500">cogsworth</code></a
>.
</p>
<p>I've applied this framework to a variety of problems so far, from <b>runaway stars</b> to <b>supernova feedback</b>, in order to better understand binary stellar evolution and the impact it can have on its environment.</p>
</div>
<div data-scroll="toggle(.fromBottomIn, .fromBottomOut)">
<h3>From asteroseismology to gravitational waves</h3>
<p>Given the complexity of the problem, it's important to constrain binary evolution using many different techniques. In a recent paper, I used detailed stellar evolution models to show, for the first time, that mass transfer leaves an imprint on the asteroseismic signals of a star for the rest of its main sequence.</p>
<p>
Previously I simulated populations of double compact objects in the Milky Way and used <a href="https://legwork.readthedocs.io"><code style="color: black; font-weight: 500">LEGWORK</code></a
>, a Python package that I developed, to estimate the subpopulations that would be detectable by the upcoming LISA gravitational wave detector. I showed how these populations varied with different binary physics for comparison with the actual observed populations.
</p>
</div>
<div data-scroll="toggle(.fromBottomIn, .fromBottomOut)">
<h3>Open-source software development</h3>
<p>
I'm passionate about developing and applying open-source software in my work. I'm the lead developer for two codes I mentioned above: <a href="https://cogsworth.readthedocs.io"><code style="color: black; font-weight: 500">cogsworth</code></a> and <a href="https://legwork.readthedocs.io"><code style="color: black; font-weight: 500">LEGWORK</code></a
>. I contribute to a number of other projects, including <a href="https://compas.science"><code style="color: black; font-weight: 500">COMPAS</code></a
>, <a href="https://cosmic-popsynth.github.io"><code style="color: black; font-weight: 500">COSMIC</code></a
>, and <a href="https://gala.adrian.pw"><code style="color: black; font-weight: 500">gala</code></a
>.
</p>
<p>I'm also the co-creator of the <a href="https://tomwagg.com/software-citation-station" style="color: black; font-weight: 500">Software Citation Station</a>, a tool to help researchers generate citations for the software they use in their work.</p>
</div>
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<h3>Beyond the science</h3>
<p>I'm originally from the luscious English countryside near Newcastle-under-Lyme and, thanks in no small part to a passionate science teacher mum, I grew up wanting to understand everything around me, which quickly led me to Physics. I play on two field hockey teams in Seattle and enjoy hiking and camping in the beautiful Pacific Northwest. In typical astronomer fashion I'm also rather partial to some bouldering!</p>
</div>
<div class="text-center" data-scroll="toggle(.fromBottomIn, .fromBottomOut)">
<p>I invite you to check out my <a href="/" style="color: white">main page</a> to learn more about my current and recent projects!</p>
<p><a class="white-link font-weight-normal" target="_blank" href="../pdf/cv.pdf">Latest CV</a> (September 2023)</p>
</div>
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<h5 class="mt-3">More about me</h5>
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<!-- <a href="#research" class="btn btn-light js-scroll-trigger mr-2">Research</a> -->
<a href="#publications" class="btn btn-light js-scroll-trigger mr-2">Publications</a>
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<a href="#presentations" class="btn btn-light js-scroll-trigger mr-2">Presentations</a>
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<span class="text-primary ouch hide">Hey! Careful!</span>
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</section>
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<h1>Transiting Exoplanets</h1>
<h3 class="font-weight-light mb-4">How can we detect planets orbiting distant stars?</h3>
<p>Since planets do not produce their own light, it is extremely difficult to directly detect them. Therefore, astrophysicists use indirection detection methods to search for them. One such method, focuses on attempting to detect the transits of exoplanets in front of stars.</p>
<div class="float-left floated-img-sized mr-3 my-2">
<img class="img-fluid rounded" src="../img/transit-animation.gif" />
<div class="text-center font-small">Animation Credit: NASA</div>
</div>
<p>As a planet passes in front of its host star, there is a small decrease in the amount of light that we detect. Therefore, if we notice a periodic dimming of a star, this could imply that there is a planet orbiting it.</p>
<p>From these 'lightcurves', we can infer information about the planet. For example, if we know the size of the star and the depth of the lightcurve, we can estimate the size of the planet.</p>
<p>Whilst still in high school, I worked in the Astrophysics department with Professor Coel Hellier. As part of SuperWASP, the UK's leading exoplanet detection program, I was tasked with analysing possible signals in order to detect new planets.</p>
<p>
During my work, I was lucky to <a target="_blank" href="https://www.keele.ac.uk/pressreleases/2015/work-experienceschoolboydiscoversanewplanet.php">discover</a> WASP-142b, a previously unknown exoplanet orbiting a star nearly 3000 light years from Earth, and become the youngest person to have discovered an exoplanet. I worked with Professor Hellier to analyse the planetary system and several other recent discoveries and these findings were
<a target="_blank" href="https://academic.oup.com/mnras/article/465/3/3693/2556157">published</a> in <i>Monthly Notices of the Royal Astronomical Society</i>.
</p>
<p>In 2018, TESS, the transiting exoplanet survey satellite, launched and began its hunt for new exoplanets with improved apparatus, I'm excited to see the new worlds that it discovers!</p>
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<h1>Population Genetics</h1>
<h3 class="font-weight-light">How does migration and changing environments affect genetic evolution?</h3>
<p>
There exist many predictions for the evolution of populations if we assume a constant environment and no spatial separation. It is relatively simply to produce simulations involving selection, mutation and genetic drift under these considerations. We can first assume that within the population, every individual has either an <b>a</b> or an <b>A</b> Allele. Then we can define mutation rates between these alleles and their relative fitnesses. Finally, using
these parameters, you can evolve the population, with one random individual dying and one randomly weighted individual being born at each time step.
</p>
<p>I created quick simulation <a href="moran_circles.html" target="_blank">here</a> to help understand the concept. You can adjust the parameters to see how this affects the evolution and be sure to click the help button for an explanation of the exact mathematics of how the simulation proceeds if you're interested!</p>
<img class="img-fluid rounded float-right floated-img-sized ml-3 my-2" src="../img/environment_change.jpg" />
<p>
My research with Professor Michael Desai focussed on creating a model for populations that are exposed to environmental changes and are divided into spatially separated subpopulations. I spent time iterating on creating an effective model that reproduced experimental results. Eventually I settled on the following; split individuals into M demes and then at each time step, randomly change environment between two environments with fixed probabilities. The
alleles can then be assigned different fitnesses based on their environment.
</p>
<p>Based on this model, I wrote a simulation in Python that could evolve a population for tens of thousands of generations in a couple of hours. These simulations produced intriguing results. I found that the allele which was beneficial for more of the time but with a lower fitness benefit was favoured as we increased the number of demes.</p>
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<h2 class="mb-0">Research Experience</h2>
<h3 class="text-warning mb-2">Past Projects</h3>
</div>
<div class="text-center font-small">
<p>(for more information on my <i>current</i> research projects, check out my <a href="../index.html#projects" class="text-warning mb-5">main page</a>!)</p>
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<h2>Transiting Exoplanets</h2>
<p class="mb-0">Analysis of Planetary Systems and Discovery of WASP-142b</p>
</span>
</span>
<img class="img-fluid" src="../img/wasp_142.jpg" alt="" />
</a>
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<div class="col-lg-6">
<a class="portfolio-item" data-to="3" style="border-top-right-radius: 15px">
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<h2>Galaxies</h2>
<p class="mb-0">Identification of Luminous Red Galaxies and Analysis</p>
</span>
</span>
<img class="img-fluid" src="../img/galaxy.jpg" alt="" />
</a>
</div>
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<h2>Population Genetics</h2>
<p class="mb-0">Investigating the effects of migration and changing environments on genetic evolution</p>
</span>
</span>
<img class="img-fluid" src="../img/dna.jpg" alt="" />
</a>
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<h2>Gravitational Waves</h2>
<p class="mb-0">Estimating the detectability of black hole-neutron star binary systems with LISA</p>
</span>
</span>
<img class="img-fluid" src="../img/binarybh.jpg" alt="" />
</a>
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</section>
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<h1>Luminous Red Galaxies</h1>
<h3 class="font-weight-light">What can we learn from luminous galaxies in the Universe?</h3>
<p>The most luminous galaxies in a cluster are known to have an extremely narrow range of colour and luminosity. This means that we can identify them efficiently within data. These galaxies are incredibly useful as, due to their high luminosity, they can be observed at extreme distances. Therefore, galaxies of this kind can help us to probe the large-scale structure of the Universe.</p>
<div class="float-right floated-img-sized ml-3 my-2">
<img class="img-fluid rounded" src="../img/lrg.jpeg" />
<div class="text-center font-small">Photo Credit: <a target="_blank" href="http://news.mit.edu/2012/cool-luminous-galaxy-cluster-identified-0815">MIT News</a></div>
</div>
<p>
During my sophomore summer and junior year, I worked with Professor Daniel Eisenstein on a project identifying and analysing high redshift, luminous red galaxies (LRGs) within the <a target="_blank" href="http://legacysurvey.org/">Legacy Surveys</a> data. I created a pipeline that, having identified the galaxies with the data, performs a series of analyses. Firstly, I use the <a href="http://vipers.inaf.it/" target="_blank">VIPERS</a>
galaxy catalogue to create a redshift distribution of the sample, which allows us to demonstrate that the sample is at high redshift ($z > 0.6$).
</p>
<p>
Additionally, in order to demonstrate the quality of the sample, I produce autocorrelations and cross correlations with the <a href="http://www.sdss3.org/dr9/algorithms/boss_galaxy_ts.php" target="_blank">BOSS CMASS LOWZ</a> sample. Using Healpy, I create pixelized representations of the sample and demonstrate correlations with the Sunayev-Zeldovich and Cosmic Infrared Background maps. Finally, I assign galaxies into clusters using a friends-of-friends
algorithm.
</p>
<p>As new data releases have occurred, our pipeline has been used to further refine our understanding of these LRGs and identify them at higher redshifts than previously possible.</p>
</div>
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<h1>Gravitational Waves</h1>
<h3 class="font-weight-light">How can we use gravitational waves to understand the most massive objects in the Universe?</h3>
<p>
You may have read in the news about LIGO’s first <a href="https://www.ligo.caltech.edu/page/press-release-gw170817" target="_blank">detection</a> of gravitational waves. This ground-breaking result has opened a new realm of gravitational wave astrophysics. LIGO, the ground-based detector, is able to measure massive binary systems just as they are merging. The next generation detector, LISA, which will be set up in space, is set to be sensitive to systems that
are not yet merging. The detection of a BH-NS with LISA would be incredible! It would provide insight into the endpoint of massive stars, whilst also helping to constrain the formation channels of BH-NSs. A BH-NS could also be used to measure the Hubble constant or even test general relativity!
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<div class="text-center font-small">The LISA Detector - Photo Credit: <a target="_blank" href="https://www.researchgate.net/figure/Artists-view-of-the-LISA-space-mission-Three-satellites-form-a-Michelson_fig1_279829392">Research Gate</a></div>
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<p>I worked with Professor Selma de Mink and Floor Broekgaarden to write my <a href="../pdf/thesis.pdf" target="_blank">senior thesis</a> on this topic in my final year at Harvard. I really encourage you to take a look at the thesis and the plots in particular, I found some really cool results such as: LISA can detect BH-NSs up to a megaparsec from Earth and most detectable BH-NSs will have been formed relatively recently (in the past billion years).</p>
<p>
I was able to provide a survey of the problem with some analytical estimations before diving into an answer to how many BH-NSs would be detectable by LISA. I used the population synthesis code COMPAS to create a sample of binaries, which I placed in synthetic Milky Ways in order to estimate a detection rate. For my thesis I only considered circular binaries and made some other approximations due to the time constraints. However, I have now finished this
project by incorporating different types of binaries, eccentricity, supernovae kicks, physics variations and some other improvements.
</p>
<p>I discuss the paper that I published with these findings on my <a href="../index.html#projects">main page</a> and you can read a post summarising the findings <a href="galactic_dcos.html">on this page</a>!</p>
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<h3>Harvard University</h3>
<h5 class="font-weight-light mb-4">A.B in Physics and Astrophysics<span class="separator"></span>Secondary in Computer Science<span class="separator"></span>Highest Honours<span class="separator"></span>2016-2020</h5>
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<div class="presentation group-presentation"><span class="title">LEGWORK: A python package for computing the evolution and detectability of stellar-origin gravitational-wave sources with space-based detectors</span><span class="group">UW Bothell Gravitational Wave Group</span><span class="date">January 2022</span></div>
<div class="presentation group-presentation"><span class="title">LEGWORK: A python package for computing the evolution and detectability of stellar-origin gravitational-wave sources with space-based detectors</span><span class="group">LECS Software Series #1</span><span class="date">January 2022</span></div>
<div class="presentation group-presentation"><span class="title">Gravitational wave sources in our Galactic backyard: Predictions for BHBH, BHNS and NSNS binaries detectable with LISA</span><span class="group">LISA Community Telecon</span><span class="date">December 2021</span></div>
<div class="presentation group-presentation"><span class="title">Gravitational wave sources in our Galactic backyard: Predictions for BHBH, BHNS and NSNS binaries detectable with LISA</span><span class="group">SESTAS Seminar at Max Planck Institute</span><span class="date">November 2021</span></div>
<div class="presentation group-presentation"><span class="title">LEGWORK: A python package for computing the evolution and detectability of stellar-origin gravitational-wave sources with space-based detectors</span><span class="group">TianQin Research Center for Gravitational Physics</span><span class="date">November 2021</span></div>
<div class="presentation conference-presentation"><span class="title">Predictions for detecting BH-NS binaries with LISA</span><span class="session">Where are the BH-NS binaries?</span><span class="conference">EAS 2021</span><span class="date">June 2021</span></div>
<div class="presentation group-presentation"><span class="title">LEGWORK: A python package for computing the evolution and detectability of stellar-origin gravitational-wave sources with space-based detectors</span><span class="group">CCA Gravitational Wave Group Meeting</span><span class="date">May 2021</span></div>
<div class="presentation conference-presentation"><span class="title">Black Hole—Neutron Star Binaries in LISA</span><span class="session">Stellar Multiples and Planets</span><span class="conference">The 13th International LISA Symposium</span><span class="date">September 2020</span></div>
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