WISE 1828+2650
Coordinates: 18h 28m 31.10s, +26° 50′ 37.79″
Observation data Epoch MJD 55467.61[1]:{{{3}}} Equinox J2000[1]:{{{3}}} |
|
---|---|
Constellation | Lyra |
Right ascension | 18h 28m 31.10s[1]:{{{3}}} |
Declination | 26° 50′ 37.79″[1]:{{{3}}} |
Characteristics | |
Spectral type | >Y2[2]:{{{3}}} |
Apparent magnitude (J (MKO filter system)) | 23.57 ± 0.35[1]:{{{3}}} |
Apparent magnitude (H (MKO filter system)) | 22.45 ± 0.08[2]:{{{3}}} |
Astrometry | |
Proper motion (μ) | RA: 954 ± 11[2]:{{{3}}} mas/yr Dec.: 153 ± 12.5[2]:{{{3}}} mas/yr |
Parallax (π) | 70 ± 14[3]:{{{3}}} mas |
Distance | approx. 47 ly (approx. 14 pc) |
Details | |
Mass | 3–6 or 0.5–20[2]:{{{3}}} MJup |
Temperature | 250–400[2]:{{{3}}} K |
Age | 2–4 or 0.1–10[2]:{{{3}}} Gyr |
Other designations | |
Database references | |
SIMBAD | data |
WISE 1828+2650 (full designation WISEPA J182831.08+265037.8) is a brown dwarf or rogue planet[2]:{{{3}}} of spectral class >Y2,[2]:{{{3}}} located in constellation Lyra at approximately 47 light-years from Earth.[3]:{{{3}}} It is the "archetypal member" of the Y spectral class.[4]:{{{3}}}
Contents
History of observations
Discovery
WISE 1828+2650 was discovered in 2011 from data collected by NASA's 40 cm (16 in) Wide-field Infrared Survey Explorer (WISE) space telescope at infrared wavelength. WISE 1828+2650 has two discovery papers: Kirkpatrick et al. (2011) and Cushing et al. (2011), however, basically with the same authors and published nearly simultaneously.[1]:{{{3}}}[4]:{{{3}}}
- 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 1828+2650 — coolest of them.[1]:{{{3}}}[~ 1]
- Cushing et al. presented discovery of seven brown dwarfs — one of T9.5 type, and six of Y-type — first members of the Y spectral class, ever discovered and spectroscopically confirmed, including "archetypal member" of the Y spectral class — WISE 1828+2650.[4]:{{{3}}} These seven objects are also the faintest seven of 98 brown dwarfs, presented in Kirkpatrick et al. (2011).[1]:{{{3}}}
Distance
Currently the most accurate distance estimate of WISE 1828+2650 is a trigonometric parallax, measured using Spitzer Space Telescope and published in 2013 by Trent Dupuy and Adam Kraus: 0.070 ± 0.014 arcsec, corresponding to a distance 14.3+3.6
−2.4 pc, or 46.6+11.6
−7.8 ly.[3]:{{{3}}}
Source | Parallax (mas) |
Distance (pc) |
Distance (ly) |
Ref |
---|---|---|---|---|
Kirkpatrick et al. (2011) (Table 6) |
– | <9.4 | <30.7 | [1]:{{{3}}} |
Beichman et al. (2013) (according Kirkpatrick et al. (2012)) |
122 ± 13 | 8.2+1.0 −0.8 |
26.7+3.2 −2.6 |
[5]:{{{3}}} |
Beichman et al. (2013) | 90 ± 9.5[~ 2] | 11.2+1.3 −1.0 |
36.5+4.2 −3.3 |
[2]:{{{3}}} |
Dupuy & Kraus (2013) | 70 ± 14[~ 3] | 14.3+3.6 −2.4 |
46.6+11.6 −7.8 |
[3]:{{{3}}} |
Non-trigonometric distance estimates are marked in italic. The most precise estimate is marked in bold. |
Proper motion
WISE 1828+2650 has proper motion of about 966 milliarcseconds per year.[2]:{{{3}}}
Source | μ mas/yr |
P. A. ° |
μRA mas/yr |
μDEC mas/yr |
Ref |
---|---|---|---|---|---|
Kirkpatrick et al. (2011) | 1084 | 84 | 1078 ± 327 | 118 ± 409 | [1]:{{{3}}} |
Beichman et al. (2013) | 966 | 81 | 954 ± 11 | 153 ± 12.5 | [2]:{{{3}}} |
Dupuy & Kraus (2013) | 1034 ± 15 | 80.4 ± 0.9 | 1020 ± 15 | 173 ± 16 | [3]:{{{3}}} |
The best estimate is marked in bold. |
Physical properties
Until the discovery of WISE 0855−0714 in 2014 WISE 1828+2650 was considered as the coldest currently known brown dwarf or the first example of free-floating planet (it is not currently known if it is a brown dwarf or a free-floating planet).[2]:{{{3}}} It has a temperature in the range 250–400 K (−23–127 °C; −10–260 °F)[2]:{{{3}}} and was initially estimated below 300 K,[4]:{{{3}}} or about 27 °C (81 °F). It has been assigned the latest known spectral class (>Y2,[2]:{{{3}}} initially estimated as >Y0[4]:{{{3}}}).
The mass of WISE 1828+2650 is in the range 0.5–20 MJup for ages of 0.1–10 Gyr.[2]:{{{3}}}
High tangential velocity of WISE 1828+2650, characteristic of an old disk population, indicates possible age of WISE 1828+2650 in the range 2–4 Gyr, leading to mass estimate of about 3–6 MJup.[2]:{{{3}}}[~ 4]
WISE 1828+2650 is similar in appearance to the other Y-type object WD 0806-661 B. WD 0806-661 B could have formed as a planet close to its primary, WD 0806-661 A, and later, when the primary became a white dwarf and lost most of its mass, have migrated into a larger orbit of 2500 AU, and similarity between WD 0806-661 B and WISE 1828+2650 may indicate that WISE 1828+2650 had formed in the same way.[2]:{{{3}}}
Possible binarity
Comparison between WISE 1828+2650 and WD 0806-661 B may suggest that WISE 1828+2650 is a system of two equal-mass objects. Observations with Hubble Space Telescope (HST) and Keck-II LGS-AO system had not revealed binarity, suggesting that if any such companion exists, it would have an orbit less than 0.5 AU, and no evidence for binarity yet exists.[2]:{{{3}}}
Comparison
See also
The other six discoveries of brown dwarfs, published by Cushing et al. in 2011:[4]:{{{3}}}
- WISE 0148−7202 (T9.5)
- WISE 0410+1502 (Y0)
- WISE 1405+5534 (Y0 (pec?))
- WISE 1541−2250 (Y0.5)
- WISE 1738+2732 (Y0)
- WISE 2056+1459 (Y0)
Notes
- ↑ 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.
- ↑ According Dupuy & Kraus (2013), this measurement uncertainty is likely underestimated.
- ↑ Relative parallax.
- ↑ This may indicate that WISE 1828+2650 is more likely a free-floating planet, not a brown dwarf, since it is below the lower mass limit for brown dwarfs (~13 MJup, see brown dwarf).
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- Lua error in package.lua at line 80: module 'strict' not found.
- NASA news release
- Science news
- Infrared image of WISE 1828+2650 at Astronomy Picture of the Day, 2011 August 30
- Solstation.com (New Objects within 20 light-years)