WISE J064723.23−623235.5
Observation data
Epoch J2000[1]      Equinox J2000[1]
Constellation Pictor
Right ascension 06h 47m 23.2270s[1]
Declination −62° 32′ 39.744″[1]
Characteristics
Spectral type Y1 ± 0.5[1]
Apparent magnitude (J (LCO filter system)) >23.0 ± 0.1[1]
Apparent magnitude (J (MKO filter system)) 22.65 ± 0.27[1]
Apparent magnitude (H (LCO filter system)) >21.7 ± 0.3[1]
Apparent magnitude (H (MKO filter system)) 23.40 ± 0.29[1]
Apparent magnitude (W1) >19.09[1]
Apparent magnitude (W2) 15.32 ± 0.08[1]
Apparent magnitude (W3) >13.49[1]
Apparent magnitude (W4) >9.66[1]
Astrometry
Proper motion (μ) RA: 2.2 ± 1.0[2] mas/yr
Dec.: 387.9 ± 1.1[2] mas/yr
Parallax (π)100.3 ± 2.4 mas[2]
Distance32.5 ± 0.8 ly
(10.0 ± 0.2 pc)
Details
Mass5–30[1] MJup
Surface gravity (log g)3.0–5.0[1] cgs
Temperature350–400[1] K
Other designations
WISE J064723.23-623235.5[1]
WISE 0647-6232[1]
Database references
SIMBADdata

WISE J064723.23−623235.5 (abbreviated WISE 0647−6232) is a nearby brown dwarf of spectral type Y1 ± 0.5, located in constellation Pictor at approximately 28 light-years from Earth. It is one of the two or three reddest and one of the four latest-type brown dwarfs known.[1]

History of observations

Discovery

WISE 0647−6232 was discovered by Kirkpatrick et al. 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. The discovery was announced in 2013.

WISE 0647−6232 was first imaged by WISE on 9 May 2010. On 17 June 2010 after preliminary data processing it was uncovered as a very cold brown dwarf candidate.

Then were carried out follow-up observations:

  • using the Infrared Array Camera (IRAC) on Spitzer Space Telescope, starting from MJD 55458.43 (possibly 16 September 2010);
  • J- and H-band images using Persson's Auxiliary Nasmyth Infrared Camera (PANIC) at the 6.5-meter Magellan Baade telescope at the Las Campanas Observatory, Chile, on 25 November 2010;
  • with the FourStar infrared camera also at Magellan Baade telescope on 15 January 2013 and 23 March 2013;
  • with the Folded-port InfraRed Echellette (FIRE) spectrograph also at Magellan Baade telescope on 24 March 2013;
  • using the Wide Field Camera 3 (WFC3) on Hubble Space Telescope on 13–14 May 2013, and pre-image was obtained on 11 February 2013.

On 25 August 2013 Kirkpatrick et al. submitted the discovery paper to The Astrophysical Journal.

WISE 0647−6232 became the 17th Y-type dwarf discovered and confirmed spectroscopically (in addition, WD 0806-661B is also almost certainly a Y-type dwarf, which was found before discovery of WISE 0647−6232, but it still lacks a spectroscopical confirmation).[1]

Distance

Currently the most accurate distance estimate of WISE 0647−6232 is a trigonometric parallax, published in 2019 by Kirkpatrick et al.: 10.0+0.2
−0.2 pc, or 32.5+0.8
−0.8 ly.[2]

WISE 0647-6232 distance estimates
SourceParallax, masDistance, pcDistance, lyRef.
Kirkpatrick et al. (2013)115 ± 128.7+1.0
−0.8		28.4+3.3
−2.7		[1]
Kirkpatrick et al. (2019)100.3 ± 2.410.0+0.2
−0.2		32.5+0.8
−0.8 		[2]

The best estimate is marked in bold.

Properties

WISE 0647−6232 has effective temperature 350–400 K and mass ~5–30 MJup, but its kinematics suggests that it may belong to Columba moving group (probability of this is 92.9%, and corresponding radial velocity should be ~22 km/s), if it is so, it may be very young (~30 Myr) and have even lower mass (<2 MJup). Its blue J − H color may suggest that its surface gravity may be relatively low (log(g)=3.0–3.5, where g is in units of cm·s−2). For ages from 0.1 to more than 10 Gyr log(g)=4.0–5.0.[1]

The only redder than WISE 0647−6232 confirmed Y dwarf is WISE 1828+2650. WD 0806-661B may also be redder than WISE 0647−6232.

The other three latest-type Y dwarfs are: WISE 0350−5658 (Y1), WISE 0535−7500 (≥Y1)[3] and WISE 1828+2650 (≥Y2).[1]

See also

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Kirkpatrick, J. Davy; Cushing, Michael C.; Gelino, Christopher R.; Beichman, Charles A.; Tinney, C. G.; Faherty, Jacqueline K.; Schneider, Adam; Mace, Gregory N. (2013). "Discovery of the Y1 Dwarf WISE J064723.23-623235.5". The Astrophysical Journal. 776 (2): 128. arXiv:1308.5372v1. Bibcode:2013ApJ...776..128K. doi:10.1088/0004-637X/776/2/128. S2CID 6230841.
  2. 1 2 3 4 5 Kirkpatrick, J. Davy; Martin, Emily C.; Smart, Richard L.; Cayago, Alfred J.; Beichman, Charles A.; Marocco, Federico; et al. (February 2019). "Preliminary Trigonometric Parallaxes of 184 Late-T and Y Dwarfs and an Analysis of the Field Substellar Mass Function into the "Planetary" Mass Regime". The Astrophysical Journal Supplement Series. 240 (2): 69. arXiv:1812.01208. Bibcode:2019ApJS..240...19K. doi:10.3847/1538-4365/aaf6af. 19.
  3. ↑ Marsh, Kenneth A.; Wright, Edward L.; Kirkpatrick, J. Davy; Gelino, Christopher R.; Cushing, Michael C.; Griffith, Roger L.; Skrutskie, Michael F.; Eisenhardt, Peter R. (2013). "Parallaxes and Proper Motions of Ultracool Brown Dwarfs of Spectral Types Y and Late T". The Astrophysical Journal. 762 (2): 119. arXiv:1211.6977. Bibcode:2013ApJ...762..119M. doi:10.1088/0004-637X/762/2/119. S2CID 42923100.
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