Carnegie Astrometric Planet Search

Carnegie Astrometric Planet Search
Name	Carnegie Astrometric Planet Search
Founded	2000s
Founders	Carnegie Institution for Science
Location	Pasadena, California
Type	Astrometric survey
Mission	Detection of exoplanets via astrometry

Contents

Carnegie Astrometric Planet Search

The Carnegie Astrometric Planet Search was an observational program led by the Carnegie Institution for Science and affiliated researchers at institutions including the Carnegie Observatories, the Observatories of the Carnegie Institution for Science, the Las Campanas Observatory, and partner universities such as Yale University, University of Chicago, University of Pennsylvania, University of Michigan, and University of California, Santa Cruz. The project sought to apply precise astrometric techniques pioneered in observatories like Mount Wilson Observatory, Palomar Observatory, and the European Southern Observatory to detect exoplanets around nearby stars, complementing radial velocity campaigns at facilities such as Keck Observatory, Anglo-Australian Telescope, and missions like Hubble Space Telescope and Hipparcos.

Overview

The program emerged in the context of exoplanet searches driven by teams from California Institute of Technology, Massachusetts Institute of Technology, Harvard-Smithsonian Center for Astrophysics, and consortia including the High Accuracy Radial velocity Planet Searcher community and the NASA Kepler Mission teams. It emphasized long-baseline astrometry informed by historic campaigns from the Carnegie Institution for Science and modern surveys associated with the European Space Agency and the National Aeronautics and Space Administration. Principal investigators included researchers linked to Paul Butler, Ralph Gaume, Ronald Gilliland, and colleagues with ties to Geoffrey Marcy, Debra Fischer, and R. Paul Butler. The search bridged research traditions represented by institutions such as Princeton University, Stanford University, Columbia University, and University of California, Berkeley.

Instrumentation combined hardware and software advances from teams at Las Campanas Observatory, Magellan Telescopes, Walter Baade Telescope, and engineering groups at the Carnegie Observatories and Mount Stromlo Observatory. The program used specialized cameras and charge-coupled devices produced by groups affiliated with MIT Lincoln Laboratory, optical designs influenced by work at Ball Aerospace, and focal-plane metrology methods developed alongside engineers from Jet Propulsion Laboratory and Space Telescope Science Institute. Astrometric methods integrated algorithms akin to those used by the Gaia consortium, the Hipparcos mission, and the Hubble Space Telescope fine guidance sensors, employing precise point-spread function modeling similar to techniques used at European Southern Observatory instruments. The team adopted calibration approaches informed by prior campaigns at Palomar Observatory and by standards from the International Astronomical Union.

Targets prioritized nearby M dwarfs and K dwarfs cataloged in compilations maintained by Two Micron All Sky Survey, Henry Draper Catalogue, and investigations connected to Gliese Catalogue of Nearby Stars, while also observing subgiants and solar-type stars of interest to groups at University of Geneva, University of California, Los Angeles, and University of Toronto. The observing strategy featured cadence and baseline planning influenced by synoptic programs at Chile-based observatories and time allocation processes practiced at Magellan Telescopes and Las Campanas Observatory. Target selection integrated stellar parameters from teams affiliated with European Southern Observatory surveys and parallaxes cross-matched with data from Hipparcos and later compared to Gaia releases. Observations were scheduled to coordinate with radial velocity teams at Keck Observatory and photometric follow-up from groups associated with Transiting Exoplanet Survey Satellite science teams and ground-based networks like Las Cumbres Observatory.

Results included candidate astrometric detections, refined stellar parallaxes, and constraints on companion masses that complemented discoveries by groups at California Institute of Technology, Harvard-Smithsonian Center for Astrophysics, Observatoire de Genève, and radial velocity programs led by researchers such as R. Paul Butler and Geoffrey Marcy. The search provided upper limits on giant planets around nearby M dwarfs that informed demographic studies published alongside teams from University of Arizona, University of Washington, and Max Planck Institute for Astronomy. Data products influenced interpretation efforts within the Exoplanet Archive community and were cited in comparative analyses with results from Spitzer Space Telescope, Kepler Space Telescope, and direct-imaging work at Gemini Observatory and Subaru Telescope. Collaborative publications appeared with coauthors from Penn State University, Carnegie Institution for Science, University of Texas at Austin, and University of Hawaii.

Data reduction pipelines incorporated astrometric calibration techniques derived from the Gaia processing framework and image analysis methods applied in projects at the Space Telescope Science Institute and the European Southern Observatory. The team used statistical frameworks and orbit-fitting software comparable to tools developed by researchers at University of California, Santa Cruz, University of California, Berkeley, University of Geneva, Monash University, and University of Oxford. Noise modeling drew on expertise from groups at Princeton University and Massachusetts Institute of Technology, while model validation and Bayesian inference were performed using methods common to investigators at University College London and University of Cambridge. Archival practices and data sharing followed community standards advocated by the International Astronomical Union and data centers such as the Centre de Données astronomiques de Strasbourg.

The project was a collaboration among the Carnegie Institution for Science, observatory partners including Las Campanas Observatory, academic partners like Yale University, and instrumentation groups from MIT Lincoln Laboratory and Ball Aerospace. Funding and logistical coordination involved agencies and foundations connected to research programs at National Science Foundation, National Aeronautics and Space Administration, and philanthropic support linked with the Carnegie Institution for Science. Co-investigators and visiting scientists came from institutions including University of Chicago, Princeton University, Harvard University, University of California, Los Angeles, and University of Michigan, while outreach and education linkages engaged public programs associated with Smithsonian Institution-affiliated museums and regional science centers.

Category:Astrometry Category:Exoplanet search projects Category:Carnegie Institution for Science