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<!DOCTYPE html>
<!--
Arcana by HTML5 UP
html5up.net | @ajlkn
Free for personal and commercial use under the CCA 3.0 license (html5up.net/license)
-->
<html>
<head>
<meta name="generator" content=
"HTML Tidy for HTML5 for Linux version 5.6.0">
<title>COMPAS | About</title>
<meta charset="utf-8">
<meta name="viewport" content=
"width=device-width, initial-scale=1">
<link rel="stylesheet" href="assets/css/main.css">
</head>
<body>
<div id="page-wrapper">
<!-- Header -->
<div id="header">
<!-- Logo -->
<img class="image logo" src="images/COMPAS.png" alt="">
<h1><a href="index.html" id="logo">COMPAS</a>
</h1>
<!-- Nav -->
<nav id="nav">
<ul>
<li class="current"><a href=
"index.html">About</a>
<!-- Don't want to separate these now that they are adjacent columns
<ul>
<li><a href="index.html#hello">Understanding binaries</a></li>
<li><a href="index.html#team">Our team</a></li>
</ul>
--></li>
<li>
<a href="science.html">Science</a>
<ul>
<li><a href=
"science.html#intro">Introduction</a>
</li>
<li><a href=
"science.html#papers">Papers</a>
<!-- Should decide if we want to list all papers here, there will be many
<ul>
<li><a href="science.html#171106287">Sensitivity to pop synthesis parameters</a></li>
<li><a href="science.html#170306873">Spin–orbit misalignment</a></li>
<li><a href="science.html#16080822">Model-independent inference</a></li>
<li><a href="science.html#150407802">Distinguishing pop synthesis models</a></li>
</ul>
--></li>
</ul>
</li>
</ul>
</nav>
</div>
<!-- Split Main content and sidebar -->
<section class="wrapper style1">
<div class="container">
<div class="row 200%">
<!-- Left Column: Understanding Binaries -->
<div class="8u 12u(narrower)">
<div id="content">
<article>
<header>
<h1 style="font-size:3em" id=
"hello">Understanding
binaries</h1>
<p>The life and death of
multiple-star systems</p>
</header>
<p>The majority of massive stars
are now known to be in binary (or
higher multiplicity) systems.
Interactions between companion
stars, often involving transfer of
mass, alter the evolution of the
individual stars and the binary as
a whole. The physical processes
involved in binary formation and
evolution are currently uncertain;
however, observations of
astrophysical phenomena associated
with different stages of binary
evolution can illuminate our
understanding. The question is: How
do we translate observations into
constraints on the physical
processes that govern binary
systems?</p>
<p>To solve this, we developed
<em>Compact Object Mergers:
Population Astrophysics and
Statistics</em> (COMPAS). COMPAS
combines tools for statistical
analysis and model selection with
rapid population synthesis,
allowing inferences to be made
about the details of stellar and
binary evolution. The COMPAS code
is publicly available at <a href=
"https://github.com/TeamCOMPAS/COMPAS">
https://github.com/TeamCOMPAS/COMPAS</a>.
Further information can be found in
the
<a href=
"http://arXiv.org/abs/2109.10352">
first </a> and
<a href=
"http://arXiv.org/abs/2506.02316">
second </a>
COMPAS methods papers or in more
technical <a href=
"https://compas.science/docs">documentation</a>.</p>
<span class=
"image featured"><img src=
"images/COMPAS_CasA.png" alt=
"Background :Cassiopeia A Supernova Remnant Credit: NASA/JPL-Caltech/O. Krause (Steward Observatory)"></span>
<p>COMPAS was initially created in
order to explore the astrophysical
implications of <a href=
"https://www.ligo.org/detections.php">
gravitational-wave observations</a>
. Gravitational waves are emitted
during mergers of double compact
objects (neutron stars or black
holes), and are now detected
regularly by the LIGO/Virgo
Collaboration. COMPAS uses models
of binary stellar evolution to make
predictions of the rates and
properties of the mergers, which
are then validated against the
observed population in order to
constrain the binary physics.</p>
<p>COMPAS has since expanded to
include other observational
signatures of binary evolution,
including Galactic Double Neutrons
Stars, X-ray Binaries, and Luminous
Red Novae. Different observations
supplement gravitational-wave data
to provide new insights into
uncertain mechanisms and create a
more complete picture of binary
astrophysics.</p>
</article>
<span class="image featured"><img src=
"images/Team2023.png" alt="Team Compas membership; credit: Floor Broekgaarden"></span>
</div>
</div>
<!-- Right column: Our Team -->
<div class="4u 12u(narrower)">
<div id="sidebar">
<!-- <section class="wrapper style2"> -->
<section align="left">
<!-- <div class="container ourteam"> -->
<!-- <header id="team" class="major"> -->
<header id="team">
<h1 style="font-size:3em">Our
team</h1>
<p>Contributors to COMPAS</p>
</header>
<!-- <div class="column" style="font-weight:bold"> -->
<div>
<!-- <h2 align="center">Current Developers</h2> -->
<h2>Current Developers</h2>
<ul style="list-style-type:disc">
<li>Adam Brcek</li>
<li><a href="http://www.broekgaarden.nl/floor/wordpress/">Floor Broekgaarden</a></li>
<li>Paul Disberg</li>
<li><a href="https://ryosuke-hirai.github.io/">Ryosuke Hirai</a></li>
<li>Veome Kapil</li>
<li><a href="https://themikelau.github.io/">Mike Lau</a></li>
<li><a href="http://ilyamandel.github.io/">Ilya Mandel</a></li>
<li>JD Merritt</li>
<li><a href="http://rileys.id.au/JeffsResearch.html"> Jeff Riley</a></li>
<li>Yuzhe (Robert) Song</li>
<li>Simon Stevenson</li>
<li><a href="https://liekevanson.github.io/">Lieke van Son</a></li>
<li>Avi Vajpeyi</li>
<li>Alejandro Vigna Gomez</li>
<li><a href="https://reinhold-willcox.github.io/home.html">Reinhold Willcox</a></li>
</ul>
</div>
<!-- <div class="column" style="font-weight:bold"> -->
<div>
<!-- <h2 align="center">Past Developers</h2> -->
<h2>Past Developers</h2>
<ul style="list-style-type:disc">
<li>Poojan Agrawal</li>
<li>Jim Barrett</li>
<li>Adam Boesky</li>
<li>Kit Boyett</li>
<li>Ben Bradnick</li>
<li>Debatri Chattopadhyay</li>
<li>Sebastian Gaebel</li>
<li>Fabian Gittins</li>
<li>George Howitt</li>
<li>Lokesh Khandelwal</li>
<li>Floris Kummer</li>
<li><a href= "https://cneijssel.github.io/cneijssel/">Coenraad Neijssel</a>
<li>Tim Riley</li>
<li>Nicholas Rodriguez-Segovia</li>
<li>Isobel Romero-Shaw</li>
<li>Serena Vinciguerra</li>
<li><a href="https://tomwagg.com">Tom Wagg</a>
</ul>
</div>
<!-- <div class="column" style="font-weight:bold"> -->
<div>
<!-- <h2 align="center">Current and past collaborators</h2> -->
<h2>Collaborators</h2>
<ul style="list-style-type:disc">
<li>Simone Bavera</li>
<li>Chris Belczynski</li>
<li>Christopher Berry</li>
<li><a href= "http://www.selmademink.com/">Selma de Mink</a></li>
<li>JJ Eldridge</li>
<li>Tassos Fragos</li>
<li><a href= "https://www.uva.nl/en/profile/j/u/s.justham/s.justham.html">Stephen Justham</a></li>
<li>Jarrod Hurley</li>
<li>Morgan MacLeod</li>
<li>Philipp Podsiadlowski</li>
<li>Ashley Ruiter</li>
<li>Dorottya Szécsi</li>
</ul>
</div>
</section>
</div>
</div>
</div>
</div>
</section>
<!-- Highlights -->
<!--<section class="wrapper style1">
<div class="container">
<div class="row 200%">
<section class="4u 12u(narrower)">
<div class="box highlight">
<a href="science.html#papers" title="Publications"><i class="icon major fa-file-text-o"></i></a>
<h3>Papers</h3>
<p>Details of COMPAS <a href="science.html#papers">science results</a>.</p>
</div>
</section>
<section class="4u 12u(narrower)">
<div class="box highlight">
<a href="science.html#intro" title="Github"><i class="icon major fa-refresh fa-spin fa-fw"></i></a>
<h3>Binary evolution</h3>
<p><a href="science.html#intro">Learn</a> about how binary stars form and evolve.</p>
</div>
</section>
<section class="4u 12u(narrower)">
<div class="box highlight">
<a href="https://github.com/TeamCOMPAS/COMPAS" title="Github"><i class="icon major fa-cogs"></i></a>
<h3>Code</h3>
<p>Download the COMPAS suite from <a href="https://github.com/TeamCOMPAS/COMPAS">Github</a>.</p>
</div>
</section>
</div>
</div>
</section>-->
<!-- CTA -->
<section id="cta" class="wrapper style3">
<div class="container">
<header>
<h2>Interested in our science?</h2>
<a href="science.html" class="button">Find out
more</a>
</header>
</div>
</section>
<!-- Footer -->
<div id="footer">
<div class="container">
<div class="row">
<section class="8u 12u(narrower)">
<h3>COMPAS contributing institutions include</h3>
<ul class="links">
<li><a href=
"http://www.monash.edu/moca">Monash
Centre for Astrophysics</a>,<br>
Monash University</li>
<li><a href=
"http://astronomy.swin.edu.au/">Centre
for Astrophysics and
Supercomputing</a>,<br>
Swinburne University of Technology</li>
<li><a href=
"http://www.ozgrav.org/">OzGrav</a>,
ARC Centre of Excellence for
Gravitational Wave Discovery</li>
<li><a href=
"https://www.cfa.harvard.edu">Center
for Astrophysics</a>,
Harvard-Smithsonian</li>
<li><A HREF = "https://www.mpa-garching.mpg.de/">Max Planck Institute for Astrophysics</A>,
Garching, Germany</li>
<li><A HREF= "https://physics.uoregon.edu/"> University of Oregon</A></li>
<li><A HREF= "https://physics-astronomy.jhu.edu/"> Johns Hopkins University</A></li>
<li><a href=
"http://www.birmingham.ac.uk/gravitational-waves/">
Institute of Gravitational Wave
Astronomy</a>,<br>
University of Birmingham</li>
<li><a href=
"http://astro.physics.unimelb.edu.au/">Astrophysics
Group</a>,<br>
University of Melbourne</li>
<li><a href=
"http://http://www.astro.uva.nl/">Anton
Pannekoek Institute for
Astronomy</a>,<br>
University of Amsterdam</li>
<li><a href=
"https://dark.nbi.ku.dk/">DARK, Niels
Bohr Institute</a>,<br>
University of Copenhagen</li>
<!-- <li><a href=
"http://astro3d.org.au">Astro3D</a>,
ARC Centre of Excellence for
Gravitational Wave Discovery</li>-->
</ul>
</section>
<!-- Removed software links
<section class="4u 12u(narrower))">
<h3>Software links</h3>
<ul class="links">
<li><a href="https://wiki.ligo.org/DASWG/LALSuite">LALSuite</a></li>
<li><a href="http://dan.iel.fm/emcee/current/">emcee</a></li>
</ul>
</section>
-->
</div>
</div>
<!-- Icons -->
<ul class="icons">
<li><a href="mailto:compas-user@googlegroups.com"
class="icon fa-envelope"><span class=
"label">Email</span></a>
</li>
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<li><a href="https://github.com/TeamCOMPAS/COMPAS"
class="icon fa-github"><span class=
"label">GitHub</span></a>
</li>
</ul>
<!-- Copyright -->
<div class="copyright">
<ul class="menu">
<!--<li>© 2016–2018, <a href="http://www.sr.bham.ac.uk/">Astrophysics & Space Research Group</a>, University of Birmingham. All rights reserved</li>-->
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Cassiopea A Supernova Remnant, credit
NASA/JPL-Caltech/O. Krause (Steward
Observatory)</a></li>
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