The DOI matches its Crossref record; 42 of the 42 references it cites were found in a registry or an index.
Meeting the Cool Neighbors. V. A 2MASS-Selected Sample of Ultracool Dwarfs
Open accessAbstract
We present the initial results of our effort to create a statistically robust, volume-limited sample of ultracool dwarfs from the Two Micron All Sky Survey Second Incremental Data Release. We are engaged in a multifaceted search for nearby late-type objects, and this is the first installment of our search using purely photometric selection. The goal of this work is a determination of the low-mass star and brown dwarf luminosity function in the infrared. Here we outline the construction of the sample, dubbed 2MU2, and present our first results, including the discovery of 186 M7–L6 dwarfs—47 of which are likely to be within 20 pc of the Sun. These results represent 66% of the ultracool candidates in our sample yet constitute a 127% increase in the number of ultracool dwarfs known within the volume searched (covering 40% of the sky out to 20 pc). In addition, we have identified 10 M4–M6.5 objects that are likely to be within 20 pc (or within 1 σ). Finally, based on these initial data, we present a preliminary luminosity function and discuss several interesting features of the partial sample presented here. Once our sample is complete, we will use our measured luminosity function to constrain the mass function of low-mass stars and brown dwarfs.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cites
The Sloan Digital Sky Survey: Technical Summary
York, D. G., Adelman, J., Anderson, Jr., Anderson, S. F., Annis, J., Bahcall, N. A., Bakken, J. A., Barkhouser, R., Bastian, S., Berman, E., et al. (2000) · The Astronomical Journal · doi:10.1086/301513 · Cited by 10,366
Secondary standard stars for absolute spectrophotometry
Oke, J. B., & Gunn, J. E. (1983) · The Astrophysical Journal · doi:10.1086/160817 · Cited by 2,811
JHKLM photometry - Standard systems, passbands, and intrinsic colors
Bessell, M. S., & Brett, J. M. (1988) · Publications of the Astronomical Society of the Pacific · doi:10.1086/132281 · Cited by 2,070
Kirkpatrick, J. D., Reid, I. N., Liebert, J., Cutri, R. M., Nelson, B., Beichman, C. A., Dahn, C. C., Monet, D. G., Gizis, J. E., & Skrutskie, M. F. (1999) · The Astrophysical Journal · doi:10.1086/307414 · Cited by 992
Self-citationA composite CO survey of the entire Milky Way
Dame, T. M., Ungerechts, H., Cohen, R. S., de Geus, E. J., Grenier, I. A., May, J., Murphy, D. C., Nyman, L.-A., & Thaddeus, P. (1987) · The Astrophysical Journal · doi:10.1086/165766 · Cited by 673
Reid, I. N., Hawley, S. L., & Gizis, J. E. (1995) · The Astronomical Journal · doi:10.1086/117655 · Cited by 664
Self-citationAstrometry and Photometry for Cool Dwarfs and Brown Dwarfs
Dahn, C. C., Harris, H. C., Vrba, F. J., Guetter, H. H., Canzian, B., Henden, A. A., Levine, S. E., Luginbuhl, C. B., Monet, A. K. B., Monet, D. G., et al. (2002) · The Astronomical Journal · doi:10.1086/341646 · Cited by 624
Self-citationSouthern spectrophotometric standards, 2
Hamuy, M., Suntzeff, N. B., Heathcote, S. R., Walker, A. R., Gigoux, P., & Phillips, M. M. (1994) · Publications of the Astronomical Society of the Pacific · doi:10.1086/133417 · Cited by 621
67 Additional L Dwarfs Discovered by the Two Micron All Sky Survey
Kirkpatrick, J. D., Reid, I. N., Liebert, J., Gizis, J. E., Burgasser, A. J., Monet, D. G., Dahn, C. C., Nelson, B., & Williams, R. J. (2000) · The Astronomical Journal · doi:10.1086/301427 · Cited by 612
Self-citationA standard stellar spectral sequence in the red/near-infrared - Classes K5 to M9
Kirkpatrick, J. D., Henry, T. J., & McCarthy, D. W., Jr. (1991) · The Astrophysical Journal Supplement Series · doi:10.1086/191611 · Cited by 584
Self-citation
Cited by
THE HAWAII INFRARED PARALLAX PROGRAM. I. ULTRACOOL BINARIES AND THE L/T TRANSITION ,
Dupuy, T. J., & Liu, M. C. (2012) · The Astrophysical Journal Supplement Series · doi:10.1088/0067-0049/201/2/19 · Cited by 573
A probable giant planet imaged in the β Pictoris disk: VLT/NaCo deep L'-band imaging
Lagrange, A.-M., Gratadour, D., Chauvin, G., Fusco, T., Ehrenreich, D., Mouillet, D., Rousset, G., Rouan, D., Allard, F., Gendron, É., et al. (2009) · Astronomy & Astrophysics · doi:10.1051/0004-6361:200811325 · Cited by 572
Kirkpatrick, J. D. (2005) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.42.053102.134017 · Cited by 560
Self-citationL′ and M′ Photometry of Ultracool Dwarfs
Golimowski, D. A., Leggett, S. K., Marley, M. S., Fan, X., Geballe, T. R., Knapp, G. R., Vrba, F. J., Henden, A. A., Luginbuhl, C. B., Guetter, H. H., et al. (2004) · The Astronomical Journal · doi:10.1086/420709 · Cited by 488
Vrba, F. J., Henden, A. A., Luginbuhl, C. B., Guetter, H. H., Munn, J. A., Canzian, B., Burgasser, A. J., Kirkpatrick, J. D., Fan, X., Geballe, T. R., et al. (2004) · The Astronomical Journal · doi:10.1086/383554 · Cited by 434
Self-citation
Metadata
- Authors
- Cruz, K. L., Reid, I. N., Liebert, J., Kirkpatrick, J. D., & Lowrance, P. J.
- Venue
- The Astronomical Journal
- Publisher
- American Astronomical Society
- Published
- 2003-11
- Volume
- 126
- Issue
- 5
- Pages
- 2421-2448
- ISSN
- 0004-6256 (ISSN-L)
- 1538-3881
- OpenAlex
- W2036899871
- Cited by
- 422
- References
- 42
- FWCI
- 16.82
- Type
- journal article
- Language
- en
- Open access
- bronze
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
How to cite
Cite CoChat for the checks on this page, and the paper for its own findings.
- This page
- CoChat. (2026). Citation check: Meeting the Cool Neighbors. V. A 2MASS-Selected Sample of Ultracool Dwarfs. https://app.cochat.ai/papers/10.1086/378607
- The paper
- Cruz, K. L., Reid, I. N., Liebert, J., Kirkpatrick, J. D., & Lowrance, P. J. (2003). Meeting the Cool Neighbors. V. A 2MASS-Selected Sample of Ultracool Dwarfs. The Astronomical Journal. https://doi.org/10.1086/378607
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
