The 20pc Census Contributed Data at the Exoplanet Archive
Project Overview
The "20pc Census" is a volume-limited census of ~3,600 stars and brown dwarfs within 20pc of the Sun. The project utilizes a combination of all-sky and targeted observations coupled with an extensive literature search and the efforts of citizen scientists through Backyard Worlds to build a comprehensive list of stars and brown dwarfs within 20pc of the Sun. The census has been used to quantify the initial mass function for the mass range M★=0.01 M☉ through M★=8 M☉. The census has been published in Kirkpatrick, J. D. et al. (2024).
Data Holdings
The primary data product from Kirkpatrick, J. D. et al. 2024 is contained in Table 4 in the paper and provides a summary of the 20pc census, including aliases cross-matched across more than a dozen catalogs, positions and proper motions, estimated masses and temperatures, spectral types, optical and infrared magnitudes, and stellar multiplicity heirarchy, including all of the references for each of the parameters. The primary table contains codes (e.g., Abt2006) for general references and for references regarding the astrometry, masses, photometry, and spectral types. The reference files contain the codes used in the primary table file and the associated web link to the ADS entry. If there is more than one reference, the references are separated by commas. Some references come with an additional note that is also separated by a comma.
| Data Set | Download Link | Approx. Download Size | Description |
|---|---|---|---|
| 20pc Census Table | Table 4 Parameters (.csv) | 2.3 MB | CSV file containing the data of the stars and brown dwarfs in the 20pc Census. This file represents the content of Table 4 in Kirkpatrick, J. D. et al. 2024 . |
| 20pc Census Table Summary | Table 4 Columns (.pdf) | 173 KB | PDF file summarizing the columns of Table 4 in Table 4 Parameters (.csv) as published ( Kirkpatrick, J. D. et al. 2024 ). |
| General Notes References | Table 4 Parameters General Notes References (.csv) | 22 KB | CSV file containing links to references identified in the General Notes for Table 4. |
| Astrometry References | Table 4 Parameters Astrometry References.csv | 4 KB | CSV file containing links to Astrometric references in Table 4. |
| Mass References | Table 4 Parameters Masses References (.csv) | 10 KB | CSV file containing links to Mass references in Table 4. |
| Photometry References | Table 4 Parameters Photometry References (.csv) | 4 KB | CSV file containing links to Photometry references in Table 4. |
| Spectral Type References | Table 4 Parameters Spectral Types References (.csv) | 20 KB | CSV file containing links to Spectral Type references in Table 4. |
Request for Acknowledgement
When using the data product, please cite the published paper Kirkpatrick, J. D. et al. 2024 and acknowledge the NASA Exoplanet Archive.
Additional Project Resources
- Kirkpatrick, J. D. et al. "The Initial Mass Function Based on the Full-sky 20-pc Census of ~3,600 Stars and Brown Dwarfs," 2024, ApJS.
- Backyard Worlds: Planet 9 at Zooniverse (original project)
- Backyard Worlds: Cool Neighbors at Zooniverse
Last updated: 12 December 2023
