DENIS J1048−3956 is an exceptionally small, dim ultra-cool red dwarf star 13.2 light-years (4.0 parsecs) from Earth in the southern constellation of Antlia, among the stars closest to Earth. This star is very dim with an apparent magnitude of about 17,[3] and requires a telescope with a camera to be seen. It was discovered in 2000 by Xavier Delfosse (Institute of Astrophysics of the Canary Islands, now Observatoire de Grenoble) and Thierry Forveille (Canada–France–Hawaii Telescope Corporation), with the assistance of nine other astronomers.[8]
  DENIS 1048−3956 Location of DENIS J1048−3956 in the constellation Antlia | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Antlia |
| Right ascension | 10h 48m 14.574s[1] |
| Declination | −39° 56′ 06.84″[1] |
| Apparent magnitude (V) | 17.532[2] |
| Characteristics | |
| Spectral type | M8.5V[2] |
| Apparent magnitude (J) | 9.5[2] |
| Astrometry | |
| Radial velocity (Rv) | −10.1 ± 0.5[2] km/s |
| Proper motion (μ) | RA: −1,179.311 mas/yr[1] Dec.: −988.121 mas/yr[1] |
| Parallax (π) | 247.2156 ± 0.0512 mas[1] |
| Distance | 13.193 ± 0.003 ly (4.0451 ± 0.0008 pc) |
| Absolute magnitude (MV) | 19.37[3] |
| Details | |
| Mass | 0.075[4] M☉ |
| Radius | 0.108[4] R☉ |
| Surface gravity (log g) | 4.3±0.3[5] cgs |
| Temperature | 2330±60[6] K |
| Age | <1[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kinematically, DENIS J1048−3956 belongs to the young thin disc.[5] In 2005 a powerful flare from this object was detected by radio astronomy.[9]
J1048 is a good example of the smallest, least massive stars possible. With a mass just 7.5% that of the Sun, it is barely large enough to sustain fusion in its core. In fact, it is so small, dim, and cool that it was originally thought to be a brown dwarf.
See also
editReferences
edit- ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d "2MASSI J1048147-395606 -- Brown Dwarf (M<0.08solMass)". Centre de Données astronomiques de Strasbourg. Retrieved 2009-12-15.
- ^ a b "The One Hundred Nearest Star Systems". RECONS. Georgia State University. January 1, 2009. Retrieved 2011-12-03.
- ^ a b Lienhard, F.; Queloz, D.; Gillon, M.; Burdanov, A.; Delrez, L.; Ducrot, E.; Handley, W.; Jehin, E.; Murray, C. A.; Triaud, A H M J.; Gillen, E.; Mortier, A.; Rackham, B. V. (2020), "Global analysis of the TRAPPIST Ultra-Cool Dwarf Transit Survey", Monthly Notices of the Royal Astronomical Society, 497 (3): 3790–3808, arXiv:2007.07278, Bibcode:2020MNRAS.497.3790L, doi:10.1093/mnras/staa2054
- ^ a b c The ultracool dwarf DENIS-P J104814.7-395606 Chromospheres and coronae at the low-mass end of the main-sequence
- ^ Gonzales, Eileen C.; Faherty, Jacqueline K.; Gagné, Jonathan; Teske, Johanna; McWilliam, Andrew; Cruz, Kelle (2019-12-01). "A Reanalysis of the Fundamental Parameters and Age of TRAPPIST-1". The Astrophysical Journal. 886 (2): 131. arXiv:1909.13859. Bibcode:2019ApJ...886..131G. doi:10.3847/1538-4357/ab48fc. ISSN 0004-637X.
- ^ Golovin, Alex; Reffert, Sabine; Just, Andreas; Jordan, Stefan; Vani, Akash; Jahreiß, Hartmut (November 2022). "The Fifth Catalogue of Nearby Stars (CNS5)". Astronomy & Astrophysics. 670: A19. arXiv:2211.01449. Bibcode:2023A&A...670A..19G. doi:10.1051/0004-6361/202244250. S2CID 253264922. Catalogue can be accessed here.
- ^ Delfosse, X.; Forveille, T.; et al. (February 2001). "New neighbours: II. An M9 dwarf at d ~ 4 pc, DENIS-P J104814.7-395606.1". Astronomy and Astrophysics. 366: L13–L17. Bibcode:2001A&A...366L..13D. doi:10.1051/0004-6361:20010001.
- ^ Adam J. Burgasser & Mary E. Putman (June 10, 2005). "Quiescent Radio Emission from Southern Late-Type M Dwarfs and a Spectacular Radio Flare from the M8 Dwarf DENIS 1048−3956". The Astrophysical Journal. 626 (1): 486–497. arXiv:astro-ph/0502365. Bibcode:2005ApJ...626..486B. doi:10.1086/429788. S2CID 13286883.
- Deacon, N. R.; Hambly, N. C. (2001). "The trigonometric parallax of DENIS-P J104814.7-395606.1". Astronomy and Astrophysics. 380: 148–150. Bibcode:2001A&A...380..148D. doi:10.1051/0004-6361:20011290.
- Jao, Wei-Chun; Henry, Todd J.; Subasavage, John P.; Brown, Misty A.; Ianna, Philip A.; Bartlett, Jennifer L.; Costa, Edgardo; Méndez, René A. (2005). "The Solar Neighborhood. XIII. Parallax Results from the CTIOPI 0.9 Meter Program: Stars with mu >= 1.0" yr-1 (MOTION Sample)". The Astronomical Journal. 129 (4): 1954–1967. arXiv:astro-ph/0502167. Bibcode:2005AJ....129.1954J. doi:10.1086/428489. S2CID 16164903.
- Costa, Edgardo; Méndez, René A.; Jao, W.-C.; Henry, Todd J.; Subasavage, John P.; Brown, Misty A.; Ianna, Philip A.; Bartlett, Jennifer (2005). "The Solar Neighborhood. XIV. Parallaxes from the Cerro Tololo Inter-American Observatory Parallax Investigation-First Results from the 1.5 m Telescope Program". The Astronomical Journal. 130 (1): 337–349. Bibcode:2005AJ....130..337C. doi:10.1086/430473.
External links
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