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<!doctype html>
<html lang="en">
<head>
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<meta name="author" content="Gemma Cheng">
<title>Gemma Cheng</title>
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<a class="nav-link click-scroll" href="#section_1">Home</a>
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<h1 class="hero-title ms-3 mb-0">Hi, I'm Gemma!</h1>
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<h2 class="mb-4">Astronomy PhD Student <br> at the University of Hertfordshire</h2>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="#fff0f6" fill-opacity="1" d="M0,160L24,160C48,160,96,160,144,138.7C192,117,240,75,288,64C336,53,384,75,432,106.7C480,139,528,181,576,208C624,235,672,245,720,240C768,235,816,213,864,186.7C912,160,960,128,1008,133.3C1056,139,1104,181,1152,202.7C1200,224,1248,224,1296,197.3C1344,171,1392,117,1416,90.7L1440,64L1440,0L1416,0C1392,0,1344,0,1296,0C1248,0,1200,0,1152,0C1104,0,1056,0,1008,0C960,0,912,0,864,0C816,0,768,0,720,0C672,0,624,0,576,0C528,0,480,0,432,0C384,0,336,0,288,0C240,0,192,0,144,0C96,0,48,0,24,0L0,0Z"></path></svg>
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<h2 class="text-white me-4 mb-0">About Me</h2>
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<p style="margin-top: 30px;">Hi! I'm Gemma and I'm a third-year astronomy PhD student at the University of Hertfordshire. My PhD project is called "the exoplanet brown dwarf connection – ultracool companions to Gaia stars", and I've also done some work with the <a href="https://gucds.inaf.it">GUCDS</a> team during the research parts of my undergraduate degree. The main research area that I'm interested in is ultracool dwarfs but I'm also interested in exoplanets (and always appreciate the pretty pictures of star-forming regions and galaxies!) I graduated from Hertfordshire with my undergraduate MPhys degree in 2022, with 1st Class Honours, and have stayed at Herts to continue my research journey!</p>
<p>Besides astronomy, I love travelling, Formula 1 and my cars Toby (seen in the photo here) and Bingo. I studied at Oklahoma State University for a year during my undergraduate degree, and I'm excited to have the opportunity to attend conferences in new places during my PhD!</p>
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<h4 class="mb-0">Information</h4>
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<span class="profile-small-title">Name</span>
<span>Gemma Cheng</span>
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<span><a href="mailto:[email protected]">[email protected]</a></span>
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<span>Centre for Astrophysics Research,</span>
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<span class="profile-small-title"> </span>
<span>University of Hertfordshire, Hatfield, AL10 9AB</span>
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<strong class="featured-numbers">3rd Yr</strong>
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<h3 class="mb-0">Gaia Ultracool Dwarfs: <br> Candidate Classification</h3>
</div>
<p>Observations of Gaia ultracool dwarf candidates have been obtained using the IRTF's SpeX instrument and Blanco's ARCoIRIS instrument. The data is reduced and the spectrum of each object is plotted to classify their spectral types. <span style="font-variant: small-caps;">SpeXtool</span> is used to reduce the SpeX data, and <TT>Splat</TT> is used to classify the candidates spectroscopically. From spectral analysis and colour-magnitude diagrams, candidates of particular interest have been identified for future further investigation, including young objects and potential binary objects.</p>
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<h3 class="mb-0">Ultracool Dwarf Companions <br> to Gaia Primary Stars</h3>
</div>
<p>Since their discovery 30 years ago, T-dwarfs have been an area of interest due to their low masses and cool atmospheres; but the properties of lone brown dwarfs are notoriously hard to determine. By finding T-dwarfs that are part of wide binary systems with Gaia-detected stars, we can infer characteristics like their age from the primary star, helping us calculate other properties and building a better picture of the physics of T-dwarfs. By creating a catalogue of these T-dwarfs along with their properties like mass, age and metallicity, we can use them as benchmarks to improve our models of brown dwarfs.
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<h3 class="projects-title">The Imitation Game</h3>
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<a href="https://sdasrc.wixsite.com/bridgingastronomy" target="_blank" class="custom-btn custom-border-btn btn mt-3">Conference Website</a>
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<h3 class="projects-title">Cool Stars 22</h3>
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<h3 class="projects-title">GUCDS V: the ultracool dwarf companion catalogue</h3>
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<a href="https://ui.adsabs.harvard.edu/abs/2024MNRAS.533.3784B" target="_blank" class="custom-btn custom-border-btn btn mt-3">View on ADS</a>
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<span class="copyright-text"><a href="mailto:[email protected]">Gemma Cheng</a> 2024.</span>
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