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<!DOCTYPE HTML>
<html lang="en">
<head>
<title>Travis Berger's Webpage</title>
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<h5>Institute for Astronomy</h5>
<h5>2680 Woodlawn Drive</h5>
<h5>Honolulu, HI 96822</h5>
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<h5>(808) 956-6989</h5>
<h6>9-5pm M-F HST</h6>
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<h5>Email:</h5>
<h6>[email protected]</h6>
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<div class="col-sm-10 col-md-5 col-lg-6">
<h2><b>Dr. Travis A. Berger</b></h2>
<h4 class="font-yellow">Astronomical Data Scientist</h4>
<ul class="information margin-tb-30">
<li><b class="font-yellow">RESEARCH INTERESTS</b> : Stars and Exoplanets</li>
<li><b class="font-yellow">GRADUATE WORK</b> : Astronomy (Ph.D.), University of Hawai'i</li>
<li><b class="font-yellow">ALMA MATER</b> : Astrophysics (BS), UNC Chapel Hill</li>
</ul>
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<a class="downlad-btn" href="Current_CV.pdf">Download CV</a>
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<h3><b>About Me</b></h3>
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<!--<div class="col-sm-12 col-md-6">-->
<div class="col-sm-12 center-text">
<p class="margin-b-50">Welcome to my research webpage. I'm currently an
Astronomical Data Scientist at Space Telescope Science Institute working on
the Guide Star Catalog for HST, JWST, and the upcoming Roman Space Telescope.
When I find time to do research I have been using Gaia to precisely constrain
host star properties to reveal the demographics of transiting planets.
I've participated in a wide variety of research projects in a number of
astronomical fields, from the analysis of spectra of main sequence stars within our galaxy to
spectra of blue supergiants in other galaxies. I have also dabbled a bit
in radio astronomy. Outside of work, I enjoy running, hiking, drinking
craft beer, watching Carolina basketball, playing video games, and fiddling
with technology. If you would like to know more about what I do, including
some of my published papers, please keep scrolling!</p>
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<!-- <div class="col-sm-12 col-md-6">
<p class="margin-b-50"> Outside of work, I enjoy running, hiking, drinking
craft beer, watching Carolina basketball, playing video games, and fiddling
with technology. If you would like to know more about what I do, including
some of my published papers, please keep scrolling!</p>
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<h5 class="desc"><b>First Author Papers</b></h5>
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<h1 class="title"><b><span class="counter-value" data-duration="700" data-count="29">0</span></b></h1>
<h5 class="desc"><b>Total Papers</b></h5>
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<h5 class="desc"><b>Years Studying</b></h5>
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<h5 class="desc"><b>k Stars Analyzed</b></h5>
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<h3><b>Research Experience</b></h3>
<h6 class="font-lite-black"><b>WORK SO FAR</b></h6>
</div>
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<h4><b>ASTRONOMICAL DATA SCIENTIST</b></h4>
<h5 class="font-yellow"><b>SPACE TELESCOPE SCIENCE INSTITUTE</b></h5>
<h6 class="font-lite-black margin-t-10">JANUARY 2023 - PRESENT</h6>
<p class="margin-tb-30">I am currently in the Data Management Division of the Space Telescope Science Institute, where I work as a member of the Catalog Science Branch. Much of
our work centers around supporting and improving the data products at the Mikulski Archive for Space Telescopes (MAST). My particular work centers on the Guide Star Catalog, which
is currently being used by HST and JWST and will be used by the Roman Space Telescope after it launches. The Guide Star Catalog serves as an important reference for these space telescopes
to ensure they are pointing correctly at their targets when carrying out meticulously planned observations.</p>
<p class="margin-tb-30"><li><span><a href="https://ui.adsabs.harvard.edu/search/q=orcid%3A0000-0002-2580-3614&sort=date+desc"><b><u>*Up-to-date list of my scientific contributions*</b></u></a></span></li></p>
<br>
<h4><b>NPP FELLOW</b></h4>
<h5 class="font-yellow"><b>NASA GODDARD SPACE FLIGHT CENTER</b></h5>
<h6 class="font-lite-black margin-t-10">SEPTEMBER 2021 - JANUARY 2023</h6>
<p class="margin-tb-30">During my NPP fellowship, I investigated transiting exoplanet demographics, focusing on planets discovered with the NASA Kepler, K2, and TESS missions. Mainly, I used
Gaia DR3 parallaxes and photometry to homogeneously constrain fundamental stellar and exoplanet parameters. I focused mostly on the exoplanet radius gap, defined by
a lack of planets with radii 1.8 times the radius of Earth, and its origin. I also investigated the diagnostic strength of [Y/Mg] as an age indicator for F, G, and K-type host stars.
<p class="margin-tb-30">NPP First Author Papers:</p>
<ul class="list margin-b-30">
<li><span><a href="https://ui.adsabs.harvard.edu/abs/2023arXiv230200009B/abstract"><b><i><u>Evidence that Core-Powered Mass-Loss Dominates Over Photoevaporation in Shaping the Kepler Radius Valley</b></i></u></a></span></li>
<li><span><a href="https://ui.adsabs.harvard.edu/abs/2023arXiv230111338B/abstract"><b><i><u>The Gaia-Kepler-TESS-Host Stellar Properties Catalog: Uniform Physical Parameters for 7993 Host Stars and 9324 Planets</b></i></u></a></span></li>
<li><span><a href="https://ui.adsabs.harvard.edu/abs/2022arXiv220610624B/abstract"><b><i><u>Is [Y/Mg] a Reliable Age Diagnostic for FGK Stars?</b></i></u></a></span></li>
</ul>
<h4><b>GRADUATE RESEARCH ASSISTANT</b></h4>
<h5 class="font-yellow"><b>INSTITUTE FOR ASTRONOMY, UNIVERSITY OF HAWAII AT MANOA</b></h5>
<h6 class="font-lite-black margin-t-10">AUGUST 2015 - AUGUST 2021</h6>
<p class="margin-tb-30">My work in grad school comprised a number of projects, from analyzing lithium in Kepler planet host star atmospheres to determine their relative ages
and finding evidence that small planets decrease in size as they age <a href="http://adsabs.harvard.edu/abs/2018ApJ...855..115B"><b><i><u>(Berger et al. 2018a)</b></i></u></a>,
to analyzing the spectra of A supergiant stars in IC 1613, a local group dwarf irregular galaxy, to investigate the galactic chemical evolution of the galaxy
<a href="http://adsabs.harvard.edu/abs/2018arXiv180507352B"><b><i><u>(Berger et al. 2018b)</b></i></u></a>. My dissertation,
<a href="https://scholarspace.manoa.hawaii.edu/items/41101703-9fbe-4ca3-9949-55d85e1695f7"><b><i><u>Precise Demographics of Kepler Exoplanets in the Gaia Era</b></i></u></a>,
focused on using Gaia DR2 to revise Kepler radii <a href="http://adsabs.harvard.edu/abs/2018arXiv180500231B"><b><i><u>(Berger et al. 2018c)</b></i></u></a> and fundamental stellar
properties <a href="https://ui.adsabs.harvard.edu/abs/2020arXiv200107737B/abstract"><b><i><u>(Berger et al. 2020a)</b></i></u></a> to investigate Kepler exoplanet demographics
as a function of stellar mass and age <a href="https://ui.adsabs.harvard.edu/abs/2020arXiv200514671B/abstract"><b><i><u>(Berger et al. 2020b)</b></i></u></a>.
<p class="margin-tb-30">Grad First Author Papers:</p>
<ul class="list margin-b-30">
<li><span><a href="https://ui.adsabs.harvard.edu/abs/2020arXiv200514671B/abstract"><b><i><u>The Gaia-Kepler Stellar Properties Catalog. II. Planet Radius Demographics as a Function of Stellar Mass and Age</b></i></u></a></span></li>
<li><span><a href="https://ui.adsabs.harvard.edu/abs/2020arXiv200107737B/abstract"><b><i><u>The Gaia-Kepler Stellar Properties Catalog. I. Homogeneous Stellar Properties for 186,301 Kepler Stars</b></i></u></a></span></li>
<li><span><a href="http://adsabs.harvard.edu/abs/2018arXiv180500231B"><b><i><u>Revised Radii of Kepler Stars and Planets Using Gaia Data Release 2</b></i></u></a></span></li>
<li><span><a href="http://adsabs.harvard.edu/abs/2018arXiv180507352B"><b><i><u>Quantitative Spectroscopy of Supergiants in the Local Group Dwarf Galaxy IC 1613: Metallicity and Distance</b></i></u></a></span></li>
<li><span><a href="http://adsabs.harvard.edu/abs/2018ApJ...855..115B"><b><i><u>Identifying Young Kepler Planet Host Stars from Keck-HIRES Spectra of Lithium</b></i></u></a></span></li>
</ul>
<p class="margin-tb-30">Other Noteworthy Papers:</p>
<ul class="list margin-b-30">
<li><span><a href="https://ui.adsabs.harvard.edu/abs/2021AJ....161..231W/abstract"><b><i><u>The Stars Kepler Missed: Investigating the Kepler Target Selection Function Using Gaia DR2</b></i></u></a></span></li>
<li><span><a href="http://adsabs.harvard.edu/abs/2017Natur.552..378M"><b><i><u>A brief visit from a red and extremely elongated interstellar asteroid</b></i></u></a></span></li>
<li><span><a href="https://ui.adsabs.harvard.edu/abs/2019PNAS..116.9723Z/abstract"><b><i><u>Growth model interpretation of planet size distribution</b></i></u></a></span></li>
</ul>
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<h6 class="font-lite-black"><b>MY WORK</b></h6>
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<h3><b>Education</b></h3>
<h6 class="font-lite-black"><b>ACADEMIC CAREER</b></h6>
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<h4><b>PH.D. IN ASTRONOMY</b></h4>
<h5 class="font-yellow"><b>UNIVERSITY OF HAWAII AT MANOA</b></h5>
<h6 class="font-lite-black margin-t-10">AWARDED IN OCTOBER 2021 (4 YEARS)</h6>
<p class="margin-t-30">Successfully defended my dissertation on the demographics
of Kepler exoplanets using Gaia while publishing three first-author papers
(<i>Revised Radii, GKSPC I, and GKSPC II</i>) which can be found at the above links.</p>
</div><!-- education -->
<div class="education right">
<h4><b>MASTER'S DEGREE IN ASTRONOMY</b></h4>
<h5 class="font-yellow"><b>UNIVERSITY OF HAWAII AT MANOA</b></h5>
<h6 class="font-lite-black margin-t-10">AWARDED IN DECEMBER 2017 (2 YEARS)</h6>
<p class="margin-t-30">Completed and published first (<i>Identifying Young Kepler Planet Host Stars from Keck-HIRES Spectra of Lithium</i>)
and second (<i>Quantitative Spectroscopy of Supergiants in the Local Group Dwarf Galaxy IC 1613: Metallicity and Distance</i>) year research
projects, succeeded in required and relevant coursework, and passed the qualifying exam. </p>
</div><!-- education -->
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<h4><b>BACHELOR'S DEGREE IN SCIENCE</b></h4>
<h5 class="font-yellow"><b>UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL - ASTROPHYSICS</b></h5>
<h6 class="font-lite-black margin-t-10">GRADUATED IN MAY 2015 (4 YEARS)</h6>
<p class="margin-t-30">Completed an Undergraduate Honors Thesis (<i>The Skynet Algorithm for Single-Dish Radio Mapping</i>)
and graduated with Highest Honors and highest distinction (GPA > 3.80).</p>
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