WISEPA J184124.74+700038.0
| Observation data Epoch MJD 55590.80[1] Equinox J2000[1] | |
|---|---|
| Constellation | Draco |
| Right ascension | 18h 41m 24.75s[1] |
| Declination | 70° 00′ 38.54″[1] |
Characteristics | |
| Whole system | |
| Apparent magnitude (J (2MASS filter system)) | 16.800 ± 0.035[1] |
| Apparent magnitude (J (MKO filter system)) | 16.64 ± 0.03[1] |
| Apparent magnitude (H (2MASS filter system)) | 16.912 ± 0.082[1] |
| Apparent magnitude (H (MKO filter system)) | 16.99 ± 0.04[1] |
| Apparent magnitude (KS (2MASS filter system)) | >15.626[1] |
| Component A | |
| Spectral type | T5[2] |
| Apparent magnitude (J (MKO filter system)) | 17.24 ± 0.10[2] |
| Apparent magnitude (H (MKO filter system)) | 17.73 ± 0.10[2] |
| Component B | |
| Spectral type | T5[2] |
| Apparent magnitude (J (MKO filter system)) | 17.57 ± 0.13[2] |
| Apparent magnitude (H (MKO filter system)) | 17.75 ± 0.10[2] |
| Astrometry | |
| Proper motion (μ) | RA: -104 ± 25[1] mas/yr Dec.: 527 ± 28[1] mas/yr |
| Distance | 131.1 ± 16[2] ly (40.2 ± 4.9[2] pc) |
| Orbit[2] | |
| Primary | A |
| Companion | B |
| Period (P) | ~11[note 1] yr |
| Details[2][note 1] | |
| Component A | |
| Mass | ≈60 MJup |
| Component B | |
| Mass | ≈60 MJup |
| Position (relative to A) | |
| Component | B |
| Epoch of observation | UT 2010 Jul 1 |
| Angular distance | 70 ± 14 mas [2] |
| Position angle | 82 ± 9° [2] |
| Projected separation | 2.8 ± 0.7 AU [2] |
| Other designations | |
| Database references | |
| SIMBAD | data |
WISEPA J184124.74+700038.0 (designation is abbreviated to WISE 1841+7000) is a binary system of brown dwarfs of spectral classes T5 + T5,[2] located in constellation Draco at approximately 131 light-years from Earth.[2] It is notable for being one of the first known binary brown dwarf systems.
Discovery
[edit]WISE 1841+7000 was discovered in 2011 from data, collected by Wide-field Infrared Survey Explorer (WISE) Earth-orbiting satellite — NASA infrared-wavelength 40 cm (16 in) space telescope, which mission lasted from December 2009 to February 2011. WISE 1841+7000A has two discovery papers: Gelino et al. (2011) and Kirkpatrick et al. (2011).[2][1] Gelino et al. examined for binarity nine brown dwarfs using Laser Guide Star Adaptive Optics system (LGS-AO) on Keck II telescope on Mauna Kea; seven of these nine brown dwarfs were also newfound, including WISE 1841+7000. These observations had indicated that two of these nine brown dwarfs, including WISE 1841+7000, are binary. Kirkpatrick et al. presented discovery of 98 new found by WISE brown dwarf systems with components of spectral types M, L, T and Y, among which also was WISE 1841+7000.[1][note 2]
Discovery of companion
[edit]Component B of the system was discovered in 2011 Gelino et al. with Laser Guide Star Adaptive Optics system (LGS-AO) on Keck II telescope. It was presented in the same article as the component A.[2]
Distance
[edit]Trigonometric parallax of WISE 1841+7000 is not yet measured. Therefore, there are only distance estimates of this object, obtained by indirect — spectrofotometric — means (see table).
WISE 1841+7000 distance estimates
| Source | Parallax, mas | Distance, pc | Distance, ly | Ref. |
|---|---|---|---|---|
| Gelino et al. (2011) | 40.2 ± 4.9 | 131.1 ± 16 | [2] | |
| Kirkpatrick et al. (2011) (not assuming binarity) |
~22,4 | ~73,1 | [1] |
Non-trigonometric distance estimates are marked in italic. The best estimate is marked in bold.
See also
[edit]The other eight objects, checked for binarity by Gelino et al. (2011) on Keck II:[2]
- binarity found:
- WISE 0458+6434 (T8.5 + T9.5, component A discovered before by Mainzer et al. (2011)[3])
- binarity not found:
- WISE 0750+2725 (T8.5, newfound[note 3])
- WISE 1322-2340 (T8, newfound)
- WISE 1614+1739 (T9, newfound)
- WISE 1617+1807 (T8, discovered before by Burgasser et al. (2011)[4])
- WISE 1627+3255 (T6, newfound)
- WISE 1653+4444 (T8, newfound)
- WISE 1741+2553 (T9, newfound)
Notes
[edit]- ^ a b For an assumed system age of 1 Gyr.
- ^ These 98 brown dwarf systems are only among first, not all brown dwarf systems, discovered from data, collected by WISE: six discoveries were published earlier (however, also listed in Kirkpatrick et al. (2011)) in Mainzer et al. (2011) and Burgasser et al. (2011), and the other discoveries were published later.
- ^ Presented in Gelino et al. (2011), but this is not mentioned in Kirkpatrick et al. (2011) and Kirkpatrick et al. (2012) — according to these two articles, the only discovery paper of WISE 0750+2725 is Kirkpatrick et al. (2011).
References
[edit]- ^ a b c d e f g h i j k l m n o p Kirkpatrick, J. Davy; Cushing, Michael C.; Gelino, Christopher R.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Mainzer, Amy K.; Eisenhardt, Peter R.; McLean, Ian S.; Thompson, Maggie A.; Bauer, James M.; Benford, Dominic J.; Bridge, Carrie R.; Lake, Sean E.; Petty, Sara M.; Stanford, Spencer Adam; Tsai, Chao-Wei; Bailey, Vanessa; Beichman, Charles A.; Bloom, Joshua S.; Bochanski, John J.; Burgasser, Adam J.; Capak, Peter L.; Cruz, Kelle L.; Hinz, Philip M.; Kartaltepe, Jeyhan S.; Knox, Russell P.; Manohar, Swarnima; Masters, Daniel; Morales-Calderon, Maria; Prato, Lisa A.; Rodigas, Timothy J.; Salvato, Mara; Schurr, Steven D.; Scoville, Nicholas Z.; Simcoe, Robert A.; Stapelfeldt, Karl R.; Stern, Daniel; Stock, Nathan D.; Vacca, William D. (2011). "The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)". The Astrophysical Journal Supplement. 197 (2): 19. arXiv:1108.4677v1. Bibcode:2011ApJS..197...19K. doi:10.1088/0067-0049/197/2/19. S2CID 16850733.
- ^ a b c d e f g h i j k l m n o p q r s Gelino, Christopher R.; Kirkpatrick, J. Davy; Cushing, Michael C.; Eisenhardt, Peter R.; Griffith, Roger L.; Mainzer, Amanda K.; Marsh, Kenneth A.; Skrutskie, Michael F.; Wright, Edward L. (2011). "WISE Brown Dwarf Binaries: The Discovery of a T5+T5 and a T8.5+T9 System". The Astronomical Journal. 142 (2): 57. arXiv:1106.3142. Bibcode:2011AJ....142...57G. doi:10.1088/0004-6256/142/2/57. S2CID 51345460.
- ^ Mainzer, A.; Cushing, Michael C.; Skrutskie, M.; Gelino, C. R.; Kirkpatrick, J. Davy; Jarrett, T.; Masci, F.; Marley, Mark S.; Saumon, D.; Wright, E.; Beaton, R.; Dietrich, M.; Eisenhardt, P.; Garnavich, P.; Kuhn, O.; Leisawitz, D.; Marsh, K.; McLean, I.; Padgett, D.; Rueff, K. (2011). "The First Ultra-cool Brown Dwarf Discovered by the Wide-field Infrared Survey Explorer". The Astrophysical Journal. 726 (1): 30. arXiv:1011.2279. Bibcode:2011ApJ...726...30M. doi:10.1088/0004-637X/726/1/30. S2CID 20700414.
- ^ Burgasser, Adam J.; Cushing, Michael C.; Kirkpatrick, J. Davy; Gelino, Christopher R.; Griffith, Roger L.; Looper, Dagny L.; Tinney, Christopher; Simcoe, Robert A.; Bochanski, John J.; Skrutskie, Michael F.; Mainzer, A.; Thompson, Maggie A.; Marsh, Kenneth A.; Bauer, James M.; Wright, Edward L. (2011). "Fire Spectroscopy of Five Late-type T Dwarfs Discovered with the Wide-field Infrared Survey Explorer". The Astrophysical Journal. 735 (2): 116. arXiv:1104.2537. Bibcode:2011ApJ...735..116B. doi:10.1088/0004-637X/735/2/116. S2CID 19003973.
