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orbitize!: A Comprehensive Orbit-fitting Software Package for the High-contrast Imaging Community

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arxiv 1910.01756 v1 pith:N7USD72X submitted 2019-10-03 astro-ph.EP

Sarah Blunt , Jason Wang , Isabel Angelo , Henry Ngo , Devin Cody , Robert J. De Rosa , James Graham , Lea Hirsch
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Vighnesh Nagpal Eric L. Nielsen Logan Pearce Malena Rice Roberto Tejada
This is my paper · ORCID
classification astro-ph.EP
keywords orbitizecommunityalgorithmavailabledesigneddevelopeddocumentationeasy
verification ladder T0 review T1 audit T2 compute T3 formal
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orbitize! is an open-source, object-oriented software package for fitting the orbits of directly-imaged objects. It packages the Orbits for the Impatient (OFTI) algorithm and a parallel-tempered Markov Chain Monte Carlo (MCMC) algorithm into a consistent and intuitive Python API. orbitize! makes it easy to run standard astrometric orbit fits; in less than 10 lines of code, users can read in data, perform one fit using OFTI and another using MCMC, and make two publication-ready figures. Extensive pedagogical tutorials, intended to be navigable by both orbit-fitting novices and seasoned experts, are available on our documentation page. We have designed the orbitize! API to be flexible and easy to use/modify for unique cases. orbitize! was designed by members of the exoplanet imaging community to be a central repository for algorithms, techniques, and know-how developed by this community. We intend for it to continue to expand and change as the field progresses and new techniques are developed, and call for community involvement in this process. Complete and up-to-date documentation is available at orbitize.info.

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Cited by 4 Pith papers

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  1. A Galactic intermediate-mass stripped star with a Wolf-Rayet-like wind

    astro-ph.SR 2026-08 conditional novelty 7.0 of 10

    WR 2-1 is the first unambiguous intermediate-mass stripped star in the Milky Way: a 3-6 solar mass, 60 kK helium-rich companion in a 5.94-day binary with a rapidly rotating O-star.

  2. Accurate proper motions of the protostellar system VLA1623-2417

    astro-ph.GA 2026-07 conditional novelty 5.0 of 10

    Accurate 11-34 year proper motions of VLA1623-2417 show the wide component W is approaching the A/B pair, eliminating the dynamical-ejection scenario.

  3. Searching for Habitable Exoplanets with Relative Astrometry (SHERA). I. The Case for Searching for Planets in Binary Star Systems

    astro-ph.EP 2026-08 conditional novelty 4.0 of 10

    SHERA is a proposed Small Explorer astrometry mission that could detect rocky habitable-zone planets around 14 nearby Sun-like stars in binary systems using microarcsecond relative astrometry.

  4. Jointly Modeling Roman Coronagraph Astrometry and Photometry Improves Orbital Parameter Estimates

    astro-ph.IM 2026-07 conditional novelty 4.0 of 10

    Adding phase-dependent reflected-light photometry to astrometry-based orbit fits improves inclination precision by 12% (SNR=3) to 33% (SNR=10) in simulated Roman CGI data.

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