Disk Detective Tutorial

Volunteers using DiskDetective, a NASA-sponsored citizen science website to find potential planetary nurseries, have made 1 million classifications in less than a year. Goddard astrophysicist Marc Kuchner, the project's principal investigator, explains how it works.Watch this video on the NASA Goddard YouTube channel.For complete transcript, click here. The marked asymmetry of the debris disk around the star HD 181327 suggests it may have formed as a result of the collision of two small bodies. Disk Detective aims to discover many other stellar disks using volunteer classifications of data from NASA's WISE mission.Image credit: NASA, ESA, G. Schneider (Univ. of Arizona), and the HST/GO 12228 Team Citizen scientists using the NASA-sponsored website DiskDetective.org have logged 1 million classifications of potential debris disks and disks surrounding young stellar objects (YSO). This data will help provide a crucial set of targets for future planet-hunting missions.By combing through objects identified in an infrared survey made with NASA's Wide-field Infrared Survey Explorer (WISE) mission, Disk Detective aims to find two types of developing planetary environments: YSO disks, which are less than 5 million years old and contains large quantities of gas, and debris disks, which tend to be older than 5 million years, and contain belts of rocky or icy debris. Computer searches already have identified some objects seen by the WISE survey as potential dust-rich disks. But software can't distinguish them from other infrared-bright sources, such as galaxies, interstellar dust clouds and asteroids. There may be thousands of potential planetary systems in the WISE data, but the only way to know for sure is to inspect each source by eye.At DiskDetective.org, volunteers watch a 10-second "flip book" of a disk candidate shown at several different wavelengths as observed from three different telescopes, including WISE. They then click one or more buttons that best describe the object's appearance. Each classification helps astronomers decide which images may be contaminated by background galaxies, interstellar matter or image artifacts, and which may be real disks that should be studied in more detail. Some 28,000 visitors around the world have participated in the project to date.The project has so far netted 478 objects of interest, which the team is investigating with a variety of ground-based telescopes in Arizona, California, New Mexico, Argentina and Chile. Disk Detective currently includes about 278,000 WISE sources. The team expects to wrap up the current project sometime in 2018, with a total of about 3 million classifications and perhaps 1,000 disk candidates. The researchers then plan to add an additional 140,000 targets to the site. Related pages

Take a tour of DiskDetective.org with Goddard astrophysicist Marc Kuchner, the project's principal investigator.Watch this video on the NASA Goddard YouTube channel.For complete transcript, click here. Marc Kuchner, the principal investigator for DiskDetective.org (left) and James Garvin, the chief scientist for NASA Goddard's Sciences and Exploration Directorate, discuss the crowdsourcing project in front of the hyperwall at Goddard's Science Visualization Lab. Credit: NASA's Goddard Space Flight Center/David Friedlander Herbig-Haro 30 is the prototype of a gas-rich young stellar object disk. The dark disk spans 40 billion miles in this image, cutting the bright nebula in two and blocking the central star from direct view. Volunteers can help astronomers find more disks like this through DiskDetective.org. Credit: NASA/Hubble/Chris Burrows (STScI) Debris disks, such as this one around the bright star Fomalhaut, tend to be older than 5 million years, possess little or no gas, and contain belts of rocky or icy debris that resemble the asteroid and Kuiper belts found in our own solar system. The radial streaks are scattered starlight. Credit: NASA/ESA/P. Kalas, J. Graham, E. Chiang, E. Kite (UC Berkeley), M. Clampin (Goddard); M. Fitzgerald (LLNL); K. Stapelfeldt and J. Krist (JPL) A new NASA-sponsored website, DiskDetective.org, lets the public discover embryonic planetary systems hidden among data from NASA's Wide-field Infrared Survey Explorer (WISE) mission. The site is led and funded by NASA and developed by the Zooniverse, a collaboration of scientists, software developers and educators who collectively develop and manage the Internet's largest, most popular and most successful citizen science projects. WISE, located in Earth orbit and designed to survey the entire sky in infrared light, completed two scans between 2010 and 2011. It took detailed measurements of more than 745 million objects, representing the most comprehensive survey of the sky at mid-infrared wavelengths currently available. Astronomers have used computers to search this haystack of data for planet-forming environments and narrowed the field to about a half-million sources that shine brightly in the infrared, indicating they may be "needles": dust-rich circumstellar disks that are absorbing their star's light and reradiating it as heat. Planets form and grow within these disks. But galaxies, interstellar dust clouds, and asteroids also glow in the infrared, which stymies automated efforts to identify planetary habitats. Disk Detective incorporates images from WISE and other sky surveys in the form of brief animations the website calls flip books. Volunteers view a flip book and then classify the object based on simple criteria, such as whether the image is round or includes multiple objects. By collecting this information, astronomers will be able to assess which sources should be explored in greater detail. The project aims to find two types of developing planetary environments. The first, known as young stellar object disks, typically are less than 5 million years old, contain large quantities of gas, and are often found in or near young star clusters. For comparison, our own solar system is 4.6 billion years old. The other type of habitat is called a debris disk. These systems tend to be older than 5 million years, possess little or no gas, and contain belts of rocky or icy debris that resemble the asteroid and Kuiper belts found in our own solar system. Vega and Fomalhaut, two of the brightest stars in the sky, host debris disks. Through Disk Detective, volunteers will help the astronomical community discover new planetary nurseries that will become future targets for NASA's Hubble Space Telescope and its successor, the James Webb Space Telescope. For More InformationSee [http://www.nasa.gov/press/2014/january/nasa-sponsored-disk-detective-lets-public-search-for-new-planetary-nurseries/](http://www.nasa.gov/press/2014/january/nasa-sponsored-disk-detective-lets-public-search-for-new-planetary-nurseries/) Related pages