2MASS 0939-2448 Contents Discovery Properties Dimmest known brown dwarf References Navigation menudata0901.40932009ApJ...695.1517L10.1088/0004-637X/695/2/15172008ApJ...689L..53B10.1086/595747astro-ph/05081502005AJ....130.2326T10.1086/491734"Astronomers Find the Two Dimmest Stellar Bulbs"1203.55432012ApJ...752...56F10.1088/0004-637X/752/1/561306.45272013MNRAS.433.2054S10.1093/mnras/stt87609h 39m 35.48s, −24° 48′ 27.9″ee
δ Pav (19.923±0.021 ly)Altair (α Aql) (16.73±0.05 ly)σ Dra (18.769±0.019 ly)η Cas (19.42±0.06 ly)e (82 G.) Eri (19.711±0.023 ly)bcdGroombridge 1618 (15.89±0.04 ly)ο² (40) Eri (16.257±0.019 ly)70 Oph (16.58±0.07 ly)GJ 570 (19.05+0.11
−0.10 ly)36 Oph (19.35±0.06 ly)HR 7703 (19.62±0.03 ly)GJ 876 (15.198±0.014 ly)dfgcbeLHS 288 (15.61+0.21
−0.20 ly)GJ 1002 (15.74+0.24
−0.23 ly)GJ 412 (15.81±0.08 ly)AD Leo (16.00±0.22 ly)GJ 832 (16.16±0.08 ly)cbEV Lac (16.37±0.08 ly)GJ 682 (16.56±0.18 ly)bcGJ 3379 (16.85±0.16 ly)G 9-38 (17.05+0.23
−0.22 ly)LHS 1723 (17.29±0.07 ly)GJ 445 (17.58+0.14
−0.13 ly)GJ 526 (17.73±0.10 ly)Stein 2051 (18.06±0.08 ly)GJ 251 (18.22±0.16 ly)GJ 205 (18.45±0.12 ly)LP 816-60 (18.6±0.4 ly)GJ 229 (18.77±0.11 ly)AbGJ 693 (18.95+0.25
−0.24 ly)Ross 47 (18.99±0.12 ly)GJ 752 (19.05±0.08 ly)B (vB 10)GJ 754 (19.30±0.18 ly)TYC 3980-1081-1 (19.3±4.3 ly)GJ 588 (19.34±0.15 ly)YZ CMi (19.43+0.27
−0.26 ly)GJ 908 (19.50±0.14 ly)GJ 1005 (19.58±0.09 ly)2MASS J05332802-4257205 (~19.6 ly)Scholz's Star (19.60+0.40
−0.28 ly)GJ 268 (19.74±0.25 ly)LP 145-141 (15.11±0.09 ly)G 240-72 (19.80+0.29
−0.28 ly)2MASS 1835+3259 (18.48±0.05 ly)DEN 0255-4700 (16.20+0.32
−0.31 ly)DEN 0817-6155 (16.1+1.1
−1.0 ly)WISE J0521+1025 (16.3±4.2 ly)2MASS 0939-2448 (17.4±0.4 ly)WISE 1741+2553 (18.1+1.6
−1.4 ly)2MASS 1114-2618 (18.20±0.14 ly)2MASS 0415-0935 (18.62±0.18 ly)WISE J2000+3629 (19.4±6.7 ly)2MASS 0937+2931 (19.96+0.22
−0.21 ly)WISE 1639-6847 (16.12+0.25
−0.24 ly)WISE 0359−5401 (19.2+4.2
−2.6 ly)WISE 1541−2250 (18.6±0.5 ly)
AntliaBinary starsBrown dwarfsT-type stars2MASS objectsAstronomical objects discovered in 2005
brown dwarfsAntlialight-years2MASSsubrogue planetsspectral classWISEWISE 1828+2650WISE 0855−0714
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Antlia |
Right ascension | 09h 39m 35.48s |
Declination | −24° 48′ 27.9″ |
Characteristics | |
Spectral type | T8[1] |
Apparent magnitude (J) | 15.61 ± 0.09[1] |
Apparent magnitude (H) | 15.96 ± 0.09[1] |
Apparent magnitude (K) | 16.83 ± 0.09[1] |
Astrometry | |
Proper motion (μ) | RA: +573.4 ± 2.3[2] mas/yr Dec.: −1044.7 ± 2.5[2] mas/yr |
Parallax (π) | 187.3 ± 4.6[2] mas |
Distance | 17.4 ± 0.4 ly (5.3 ± 0.1 pc) |
Details | |
2MASS 0939-2448 A | |
Mass | 20–50[1] MJup |
Radius | 0.08 – 0.09[1] R☉ |
Temperature | 600–700[1] K |
Metallicity | −0.3–0.0[1] |
Age | 2–10[1] Gyr |
2MASS 0939-2448 B | |
Mass | 20–40[1] MJup |
Radius | 0.09[1] R☉ |
Temperature | 600–700[1] K |
Metallicity | −0.3–0.0[1] |
Age | 2–10[1] Gyr |
Other designations | |
2MASS J09393548-2448279[3] | |
Database references | |
SIMBAD | data |
2MASS 0939-2448 (full designation is 2MASS J09393548-2448279)[3] is a probable system of two nearby T-type brown dwarfs, located in constellation Antlia at 17.4 light-years from Earth.[2]
Contents
1 Discovery
2 Properties
3 Dimmest known brown dwarf
4 References
Discovery
2MASS 0939-2448 was identified as a brown dwarf through analysis of data from the 2MASS survey by Tinney et al. The discovery was published in 2005.[3]
Properties
Model calculations suggest that 2MASS 0939-2448 is a system of two brown dwarfs with effective temperatures of about 500 and 700 K and masses of about 25 and 40 Jupiter masses; it is also possible that it is a pair of identical objects with temperatures of 600 K and 30 Jupiter masses.[1]
Dimmest known brown dwarf
From publication of the discovery in 2005 till at least 2008, 2MASS 0939-2448, or its dimmer component, was the dimmest brown dwarf known.[4] Later dimmer objects, including (sub)brown dwarfs and rogue planets of new spectral class Y, were discovered, using data from WISE and from other surveys. In 2011–2014, the dimmest known of these objects was WISE 1828+2650, and from 2014 the dimmest one is WISE 0855−0714.
References
^ abcdefghijklmno Leggett, S. K.; Cushing, Michael C.; Saumon, D.; Marley, M. S.; Roellig, T. L.; Warren, S. J.; Burningham, Ben; Jones, H. R. A.; Kirkpatrick, J. D.; Lodieu, N.; Lucas, P. W.; Mainzer, A. K.; Martín, E. L.; McCaughrean, M. J.; Pinfield, D. J.; Sloan, G. C.; Smart, R. L.; Tamura, M.; Van Cleve, J. (2009). "The Physical Properties of Four ~600 K T Dwarfs". The Astrophysical Journal. 695 (2): 1517–1526. arXiv:0901.4093. Bibcode:2009ApJ...695.1517L. doi:10.1088/0004-637X/695/2/1517..mw-parser-output cite.citationfont-style:inherit.mw-parser-output .citation qquotes:"""""""'""'".mw-parser-output .citation .cs1-lock-free abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .citation .cs1-lock-subscription abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registrationcolor:#555.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration spanborder-bottom:1px dotted;cursor:help.mw-parser-output .cs1-ws-icon abackground:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center.mw-parser-output code.cs1-codecolor:inherit;background:inherit;border:inherit;padding:inherit.mw-parser-output .cs1-hidden-errordisplay:none;font-size:100%.mw-parser-output .cs1-visible-errorfont-size:100%.mw-parser-output .cs1-maintdisplay:none;color:#33aa33;margin-left:0.3em.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-formatfont-size:95%.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-leftpadding-left:0.2em.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-rightpadding-right:0.2em
^ abcd Burgasser, Adam J.; Tinney, C. G.; Cushing, Michael C.; Saumon, Didier; Marley, Mark S.; Bennett, Clara S.; Kirkpatrick, J. Davy (2008). "2MASS J09393548-2448279: The Coldest and Least Luminous Brown Dwarf Binary Known?". The Astrophysical Journal. 689 (1): L53–L56. Bibcode:2008ApJ...689L..53B. doi:10.1086/595747.
^ abc Tinney, C. G.; Burgasser, Adam J.; Kirkpatrick, J. Davy; McElwain, Michael W. (2005). "The 2MASS Wide-Field T Dwarf Search. IV. Hunting Out T Dwarfs with Methane Imaging". The Astronomical Journal. 130 (5): 2326–2346. arXiv:astro-ph/0508150. Bibcode:2005AJ....130.2326T. doi:10.1086/491734.
^ "Astronomers Find the Two Dimmest Stellar Bulbs" (Press release). NASA/JPL. 2008-12-10. Retrieved 2008-12-20.
Faherty, Jacqueline K.; Burgasser, Adam J.; Walter, Frederick M.; Van der Bliek, Nicole; Shara, Michael M.; Cruz, Kelle L.; West, Andrew A.; Vrba, Frederick J.; Anglada-Escud, Guillem (2012). "The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs". The Astrophysical Journal. 752 (1): 56. arXiv:1203.5543. Bibcode:2012ApJ...752...56F. doi:10.1088/0004-637X/752/1/56.
Smart, R. L.; Tinney, C. G.; Bucciarelli, B.; Marocco, F.; Abbas, U.; Andrei, A.; Bernardi, G.; Burningham, B.; Cardoso, C.; Costa, E.; Crosta, M. T.; Daprá, M.; Day-Jones, A.; Goldman, B.; Jones, H. R. A.; Lattanzi, M. G.; Leggett, S. K.; Lucas, P.; Mendez, R.; Penna, J. L.; Pinfield, D.; Smith, L.; Sozzetti, A.; Vecchiato, A. (2013). "NPARSEC: NTT Parallaxes of Southern Extremely Cool objects. Goals, targets, procedures and first results". Monthly Notices of the Royal Astronomical Society. 433 (3): 2054–2063. arXiv:1306.4527. Bibcode:2013MNRAS.433.2054S. doi:10.1093/mnras/stt876.
Coordinates: 09h 39m 35.48s, −24° 48′ 27.9″
2MASS objects, Antlia, Astronomical objects discovered in 2005, Binary stars, Brown dwarfs, T-type starsUncategorized