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2MASS J04151954−0935066

The brown dwarf 2MASS J04151954−0935066 seen by JWST Credit: 2MASS
Observation data Epoch J2000      Equinox J2000
Constellation	Eridanus
Right ascension	04 15 19.54
Declination	−09° 35′ 06.6″
Characteristics
Spectral type	T8V
Apparent magnitude (Y)	16.438 ± 0.009
Apparent magnitude (J)	15.343 ± 0.004
Apparent magnitude (H)	15.666 ± 0.012
Apparent magnitude (Ks)	15.658 ± 0.023
Astrometry
Proper motion (μ)	RA: 2214.3 ± 1.2 mas/yr Dec.: 535.9 ± 1.2 mas/yr
Parallax (π)	175.2 ± 1.7 mas
Distance	18.6 ± 0.2 ly (5.71 ± 0.06 pc)
Details
Mass	36±3 MJup
Radius	0.800±0.004 RJup
Luminosity (bolometric)	10 L☉
Surface gravity (log g)	5.14±0.03 cgs
Temperature	758+18 −3 K
Metallicity	0.28±0.02 dex
Age	4-6 Gyr
Other designations
2MASS 0415-0935; 2MASSI J0415195−093506; 2MASSW J0415195−093506
Database references
SIMBAD	data
2MASS 0415−0935Location of 2MASS 0415−0935 in the constellation Eridanus

2MASS J04151954−0935066 (also abbreviated to 2MASS 0415−0935) is a brown dwarf of spectral class T8, in the constellation Eridanus about 18.6 light-years from Earth. This is a reference (standard) object for the definition of the T8 spectral class.

Discovery

2MASS 0415−0935 was discovered in 2002 by Adam J. Burgasser et al. from Two Micron All-Sky Survey (2MASS), conducted from 1997 to 2001. Follow-up observations were made in 1998–2001 using the Near-Infrared Camera, mounted on the Palomar 60 inch (1.5 m) Telescope; CTIO Infrared Imager (CIRIM) and Ohio State Infrared Imager/Spectrometer (OSIRIS), mounted on the Cerro Tololo Inter-American Observatory (CTIO) 1.5 m Telescope; and some additional observations were made using the Near Infrared Camera (NIRC), mounted on the Keck I 10 m telescope, and nearinfrared camera D78, mounted on the Palomar 5 m Hale Telescope. In 2002 Burgasser et al. published a paper, where they defined new spectral subtypes T1—T8, and presented discovery of 11 new T-type brown dwarfs, among which also was 2MASS 0415−0935 — object of the latest known by the time spectral type T8. These 11 objects were among the earliest T-type brown dwarfs ever discovered: before this, the total number of known T-type objects was 13, and these discoveries increased it up to 24 (apart from additional T-type dwarfs, identified by Geballe et al. 2001 in SDSS data).

Distance

Currently the most precise distance estimate of 2MASS 0415−0935 is published in 2012 by Dupuy & Liu trigonometric parallax, measured under The Hawaii Infrared Parallax Program: 175.2 ± 1.7 milliseconds of arc, corresponding to a distance 5.71 ± 0.05 pc, or 18.62 ± 0.18 ly. A less precise parallax of this object, measured under U.S. Naval Observatory Infrared Astrometry Program, was published in 2004 by Vrba et al.

Space motion

Position of 2MASS 0415−0935 shifts due to its proper motion by 2.2553 arcseconds per year (2.2782 ± 0.0012 arcsec, according to Dupuy & Liu (2012)).

Properties

2MASS 0415-0935 belongs to the spectral class T8V; its surface temperature is about 750 kelvins. As with other brown dwarfs of spectral type T, its spectrum was thought to be dominated by methane, although by 2015 with the improved spectroscopic database many of the spectral lines were re-assigned to water. The Research Consortium On Nearby Stars (RECONS) estimates the brown dwarf to be 0.03 solar masses.

2MASS 0415-0935 was observed with NIRSpec on JWST. The observation constrained the abundances of water vapor (H₂O), methane (CH₄), carbon monoxide (CO), carbon dioxide (CO₂) and ammonia (NH₄). The abundance of hydrogen sulfide (H₂S) was less well constrained and phosphine (PH₃) was not detected, but an upper limit of its abundance was measured. The CO/CO ratio is 97+9
−8, which is similar for 2MASS J03552337+1133437 and similar to the ratio in the sun. It was shown that the current models of vertical mixing that predict the abundances of different molecules are inconsistent with measured abundances of carbon dioxide. 2MASS 0415-0935 joins a number of T and Y-dwarfs with missing phosphine, such as WISE 0359−5401, requiring a major revision of phosphorus chemistry in brown dwarfs and possibly giant planets.

See also

The other 10 brown dwarfs, presented in Burgasser et al. (2002):

• 2MASS 0243−2453 (T6)
• 2MASS 0727+1710 (T7)
• 2MASS 0755+2212 (T5)
• 2MASS 0937+2931 (T6)
• 2MASS 1534−2952 (T5.5)
• 2MASS 1546−3325 (T5.5)
• 2MASS 1553+1532 (T7)
• 2MASS 2254+3123 (T5)
• 2MASS 2339+1352 (T5.5)
• 2MASS 2356−1553 (T6)

References

1. ^ Lodieu, N.; Burningham, B.; Day-Jones, A.; Scholz, R.-D.; Marocco, F.; Koposov, S.; Barrado; Navascués, D.; Lucas, P. W.; Cruz, P.; Lillo, J.; Jones, H.; Perez-Garrido, A.; Ruiz, M. T.; Pinfield, D.; Rebolo, R.; Béjar, V. J. S.; Boudreault, S.; Emerson, J. P.; Banerji, M.; González-Solares, E.; Hodgkin, S. T.; McMahon, R.; Canty, J. & Contreras, C. (2012). "First T dwarfs in the VISTA Hemisphere Survey". Astronomy & Astrophysics. 548: A53. arXiv:1210.5148. Bibcode:2012A&A...548A..53L. doi:10.1051/0004-6361/201220182. S2CID 119183225.
2. ^ Dupuy, Trent J.; Liu, Michael C. (2012). "The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition". The Astrophysical Journal Supplement. 201 (2): 19. arXiv:1201.2465. Bibcode:2012ApJS..201...19D. doi:10.1088/0067-0049/201/2/19. S2CID 119256363.
3. ^ Hood, Callie E.; Mukherjee, Sagnick; Fortney, Jonathan J.; Line, Michael R.; Faherty, Jacqueline K.; Merchan, Sherelyn Alejandro; Burningham, Ben; Suárez, Genaro; Kiman, Rocio; Gagné, Jonathan; Beichman, Charles A.; Vos, Johanna M.; Gagliuffi, Daniella Bardalez; Meisner, Aaron M.; Gonzales, Eileen C. (8 Feb 2024). "High-Precision Atmospheric Constraints for a Cool T Dwarf from JWST Spectroscopy". Nature Astronomy. arXiv:2402.05345.
4. "2MASS J04151954-0935066 -- Brown Dwarf (M<0.08solMass)". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-11-24.
5. ^ Canty, J. I.; Lucas, P. W.; Yurchenko, Sergei N.; Tennyson, Jonathan; Leggett, S. K.; Tinney, C. G.; Jones, H. R. A.; Burningham, Ben; Pinfield, D. J.; Smart, R. L. (2015), "Methane and ammonia in the near-infrared spectra of late-T dwarfs", Monthly Notices of the Royal Astronomical Society, 450: 454–480, arXiv:1503.04715, doi:10.1093/mnras/stv586
6. ^ Burgasser, Adam J.; Kirkpatrick, J. Davy; Brown, Michael E.; Reid, I. Neill; Burrows, Adam; Liebert, James; Matthews, Keith; Gizis, John E.; Dahn, Conard C.; Monet, David G.; Cutri, Roc M.; Skrutskie, Michael F. (2002). "The Spectra of T Dwarfs. I. Near-Infrared Data and Spectral Classification". The Astrophysical Journal. 564 (1): 421–451. arXiv:astro-ph/0108452. Bibcode:2002ApJ...564..421B. doi:10.1086/324033. S2CID 9273465.
7. Vrba, F. J.; Henden, A. A.; Luginbuhl, C. B.; Guetter, H. H.; Munn, J. A.; Canzian, B.; Burgasser, Adam J.; Kirkpatrick, J. Davy; Fan, X.; Geballe, T. R.; Golimowski, D. A.; Knapp, G. R.; Leggett, S. K.; Schneider, D. P.; Brinkmann, J. (2004). "Preliminary Parallaxes of 40 L and T Dwarfs from the US Naval Observatory Infrared Astrometry Program". The Astronomical Journal. 127 (5): 2948–2968. arXiv:astro-ph/0402272. Bibcode:2004AJ....127.2948V. doi:10.1086/383554. S2CID 16344176.
8. "The 100 nearest star systems". Research Consortium On Nearby Stars. Georgia State University. January 1, 2012. Retrieved 2012-06-11.

Further reading

• Dupuy, Trent J.; Liu, Michael C. (2012). "The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition". The Astrophysical Journal Supplement Series. 201 (2): 19. arXiv:1201.2465v1. Bibcode:2012ApJS..201...19D. doi:10.1088/0067-0049/201/2/19. S2CID 119256363.

External links

• Entry at DwarfArchives.org Archived 2019-06-10 at the Wayback Machine

v t e Constellation of Eridanus
List of stars in Eridanus Eridanus in Chinese astronomy
Stars	Bayer α (Achernar) β (Cursa) γ (Zaurak) δ (Rana) ε (Ran) ζ (Zibal) η (Azha) θ (Acamar) θ ι κ λ μ ν ξ ο (Beid) ο (40, Keid) π ρ ρ ρ τ τ (Angetenar) τ τ τ τ τ τ τ υ υ (Theemin) υ (Beemim) υ φ χ ψ ω Flamsteed 14 15 17 (v) 39 (A) 45 51 (c) 53 (Sceptrum) 54 58 64 66 Variable DO DZ EF EK EM (d) EP KT HR 486 (p) 487 (p) 506 (q) 789 (s) 859 1008 (e) 1106 (y) 1143 (h) 1189 (f) 1190 (f) 1195 (g) 1483 1536 1614 HD 18742 (Ayeyarwady) 19467 28185 30562 30856 (Mouhoun) 30963 Other 2MASS J04151954−0935066 DENIS 0255−4700 Gliese 86 Gliese 180 GJ 1062 GJ 3293 GJ 3323 HIP 12961 (Koeia) LTT 1445 LP 890-9 Mothra WASP-22 (Tojil) WASP-35 WASP-50 (Chaophraya) WASP-78 WASP-79 (Montuno) WISE J0336−0143
Exoplanets 51 Eridani b ε Eridani b (AEgir) Gliese 86 b HD 10647 b HD 18742 b (Bagan) HD 28185 b HD 30562 b HD 30856 Ab (Nakanbé) WASP-79b (Pollera)
Nebulae	NGC 1535
Galaxies	NGC 782 852 939 1084 1132 1140 1154 1155 1157 1158 1172 1187 1189 1190 1191 1192 1199 1222 1232 1234 1241 1253 1262 1266 1269 1291 1300 1309 1325 1332 1337 1345 1347 1353 1357 1369 1386 1395 1400 1403 1404 1407 1426 1427A 1436 1437 1439 1452 1460 1487 1531 1532 1592 1600 1614 1637 1721 1723 1725 1728 1741 Other Eridanus II ESO 198-13 ESO 0313-192 IC 1953 IC 2006 LEDA 74886 MRC 0406-244 PKS 0208-512 PKS 0405–385 PKS 0420-014 UGC 2812
Galaxy clusters Abell 383 Eridanus Cluster Eridanus Group MACS J0416.1-2403
Astronomical events GRB 080913 HE0435-1223
Category

• Eridanus (constellation)
• Brown dwarfs
• T-type brown dwarfs
• 2MASS objects
• Astronomical objects discovered in 2002
• TIC objects