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<!DOCTYPE HTML>
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<title>Dr. Yanchulova Merica-Jones | STScI</title>
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<h1 id="title">Dr. Petia Yanchulova Merica-Jones</h1>
<p>Postdoctoral Researcher</p>
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<h2 style="text-align:left", class="alt"><strong>Dr. Petia Yanchulova Merica-Jones</strong> </h2>
<p style="text-align:left" > I am a postdoctoral researcher in the
<a href="https://sites.google.com/view/ism-stsci/">ISM*@ST</a>
group at the <a href="http://www.stsci.edu/">Space Telescope Science Institute</a>.<br/>
I work with Dr. Karl Gordon and Dr. Claire Murray on the
<a href="https://cmurray-astro.github.io/">Scylla project </a> and other surveys <br />
using the <a href="https://beast.readthedocs.io/en/latest/">BEAST</a> tool to study dust
and interstellar medium properties in nearby galaxies. <br />
I received my PhD in Physics (Astrophysics) from the University of California, San Diego
in 2020.</p>
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<h2>Research</h2>
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<p>The properties and evolution of the interstellar medium (ISM) of galaxies govern galaxy
formation and evolution. My research has to do with understanding these properties in nearby
galaxies. The Small and Large Magellanic Clouds (SMC & LMC), in particular, are excellent
laboratories for observing spatially resolved stellar populations and individual gas/dust
clouds enabling a detailed analysis of the ISM and stellar properties.</p>
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<h3>Dust Extinction</h3>
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<p> Color-magnitude diagrams (CMDs) of reddened stars can provide rich
information about dust extinction properties of nearby galaxies. I use CMDs
to study dust extinction as a way to constrain dust grain properties. My
research has made use of Hubble Space Telescope observations of resolved
stars in the SMC to understand how the dust extinction curve at
low-metallicity may be different from that in evolved galaxies.
[SMIDGE, PI <a href="https://karinsandstrom.github.io/" target="_blank">K. Sandstrom] </a><br />
<a href="https://ui.adsabs.harvard.edu/abs/2017ApJ...847..102Y/" target="_blank"><span class="icon regular fa-newspaper"> Yanchulova M-J et al. 2017, ApJ</span></a>
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<h3>Galactic Geometry</h3>
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<p> Observations of spatially-resolved stellar populations make it possible to
analyze the 3-D structure of the stars, dust, and gas. My thesis focused on
modeling the effects of dust extinction and galactic geometry (stellar and
dust layer positions and relative offsets) on the CMD of stars in the SW
Bar of the SMC. We found that when CMDs are used to study dust extinction in
nearby galaxies, the stellar and dust geometry must be modeled as well to
properly infer the dust properties. <br />
<a href="https://ui.adsabs.harvard.edu/abs/2020arXiv201011181Y" target="_blank"><span class="icon regular fa-newspaper"> Yanchulova M-J et al. 2020 acc., ApJ</span></a>
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<h3>Dust + Stellar Properties</h3>
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<p>
The wealth of information contained in photometric surveys of resolved stars
in nearby galaxies - such as Scylla
(PI <a href="https://cmurray-astro.github.io/#" target="_blank">C. Murray </a>)
and SMIDGE - makes it possible to model the stellar and dust properties together.
<a href="https://github.com/BEAST-Fitting/beast" target="_blank">The BEAST</a>
tool enables high resolution mapping of stellar and dust properties
by fitting the individual stellar photometry to a stellar physics model
and models for the dust extinction and observational uncertainties.
Additionally, the chemical enrichment and star formation histories can be
studied in great detail.
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<p><a href="https://ui.adsabs.harvard.edu/search/q=author%3A(%22Yanchulova%22%20OR%20%22Yanchulova%20Merica-Jones%2C%20Petia%22)&sort=date%20desc%2C%20bibcode%20desc&p_=0" target="_blank">Astronomy Data Service Publications Search</a></p>
<li style="text-align:left">Submitted to ApJ March 2024: A Catalog of Stellar and Dust Properties for 500,000 stars in
the Southwest Bar of the Small Magellanic Cloud</a>.</li>
<li style="text-align:left">2021: <a href="https://ui.adsabs.harvard.edu/abs/2020arXiv201011181Y"
target="_blank">Three-Dimensional Structure and Dust Extinction in the
Small Magellanic Cloud</a>, The Astrophysical Journal, 2021, 907:50.</li>
<li style="text-align:left">2017: <a href="https://ui.adsabs.harvard.edu/abs/2017ApJ...847..102Y/"
target="_blank">The Small Magellanic Cloud Investigation of Dust and Gas
Evolution (SMIDGE): The Dust Extinction Curve from Red Clump Stars.</a> The
Astrophysical Journal, 2017, 847:102.</li>
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