THE SOLAR NEIGHBORHOOD. XXX. FOMALHAUT C
Open accessAbstract
LP 876-10 is a nearby active M4 dwarf in Aquarius at a distance of 7.6 pc. The star is a new addition to the 10 pc census, with a parallax measured via the REsearch Consortium On Nearby Stars (RECONS) astrometric survey on the Small and Moderate Aperture Research Telescope System's 0.9 m telescope. We demonstrate that the astrometry, radial velocity, and photometric data for LP 876-10 are consistent with the star being a third bound stellar component to the Fomalhaut multiple system, despite the star lying nearly 6° away from Fomalhaut A in the sky. The three-dimensional separation of LP 876-10 from Fomalhaut is only 0.77 ± 0.01 pc, and 0.987 ± 0.006 pc from TW PsA (Fomalhaut B), well within the estimated tidal radius of the Fomalhaut system (1.9 pc). LP 876-10 shares the motion of Fomalhaut within ∼1 km s −1 , and we estimate an interloper probability of ∼10 −5 . Neither our echelle spectroscopy nor astrometry are able to confirm the close companion to LP 876-10 reported in the Washington Double Star Catalog (WSI 138). We argue that the Castor Moving Group to which the Fomalhaut system purportedly belongs, is likely to be a dynamical stream, and hence membership to the group does not provide useful age constraints for group members. LP 876-10 (Fomalhaut C) has now risen from obscurity to become a rare example of a field M dwarf with well-constrained age (440 ± 40 Myr) and metallicity. Besides harboring a debris disk system and candidate planet, Fomalhaut now has two of the widest known stellar companions.
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
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.
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
The complex series of dimmings of J1407 in May 2007 was hypothesised to be caused by a giant circumsecondary disk transiting the disk of the star.
“A complex series of dimmings of the young star 1SWASP J140747.93-394542.6 (hereafter shortened to J1407) in May 2007 was hypothesised to be caused by a giant circumsecondary disk transiting the disk of the star (E. E. Mamajek et al. 2013; M. A. Kenworthy et al. 2015).”
From Non-detection of J1407 b in ALMA Band 7 Observations (2025) · cites this paper as E. E. Mamajek et al. 2013
The cited paper’s Introduction and §2.4 (Duplicity) discuss Fomalhaut C (LP 876-10) and a possible companion, not J1407. Searches for J1407 and a circumsecondary-disk transit found no passage addressing the May 2007 dimmings. The available passages have no page numbers. (LLM, conf=0.78)
Experimental — accuracy not yet measured
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
The citation lists haven’t been fetched yet
References 99 · Cited by 103
Research works printed but not linked: 4
- [9]9. Bartlett, J. L. 2007, PhD thesis, Univ.
- [43]43. Kaeufl, H.-U., Ballester, P., Biereichel, P., et al. 2004, Proc. SPIE, 5492, 1218
- [52]52. Luyten, W. J., & Hughes, H. S. 1980, Proper Motion Survey with the Forty-Eight Inch Schmidt Telescope. LV. First Supplement to the NLTT Catalogue, Vol. 55 (Minneapolis, MN: Univ. Minnesota), 1
- [63]63. Morell, O. 1994, PhD thesis, Acta Universitas Upsaliensis
- Authors
- Mamajek, E. E., Bartlett, J. L., Seifahrt, A., Henry, T. J., Dieterich, S. B., Lurie, J. C., Kenworthy, M. A., Jao, W.-C., Riedel, A. R., Subasavage, J. P., Winters, J. G., Finch, C. T., Ianna, P. A., & Bean, J.
- Affiliations
- Cerro Tololo Inter-American Observatory (CL)
- United States Naval Observatory (US)
- University of Chicago (US)
- Georgia State University (US)
- Leiden University (NL)
- American Museum of Natural History (US)
- University of Virginia (US)
- Corresponding author
- Mamajek, Eric E.
- ORCID
- Venue
- The Astronomical Journal
- Publisher
- American Astronomical Society
- Published
- 2013-11-08
- Volume
- 146
- Issue
- 6
- Pages
- 154
- ISSN
- 0004-6256 (ISSN-L)
- 1538-3881
- OpenAlex
- W2152753635
- Semantic Scholar
- aaf5c6835f5a4fcd3e0b38ece3dbd60570aa6cbe
- Cited by
- 103
- References
- 99
- Citations by year
- 2026: 2 · 2025: 5 · 2024: 8 · 2023: 2 · 2022: 3 · 2021: 10 · 2020: 5 · 2019: 6 · 2018: 6 · 2017: 12 · 2016: 11 · 2015: 17 · 2014: 14 · 2013: 2
- FWCI
- 7.91
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- The Astronomical Journal (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Science Foundation (1008908, 0507711, 0908402)
- National Aeronautics and Space Administration
- U.S. Naval Observatory
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
- Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
- Keywords
- M dwarfs, nearby stars, astrometry, radial velocity, stellar membership, tidal radius, stellar ages, metallicity, debris disks, planetary companions
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
