WISE J2030+0749

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WISE J2030+0749
WISE J2030+0749 unWISE.jpg
WISE J2030+0749
Credit: unWISE
Observation data
Epoch J2000        Equinox J2000
Constellation Delphinus
Right ascension 20h 30m 42.330s [1]
Declination +07° 49′ 35.78″ [1]
Characteristics
Spectral type T1.5 [2] [3]
Apparent magnitude  (i (SDSS))21.810 ± 0.140 [3]
Apparent magnitude  (z (SDSS))17.195 ± 0.014 [3]
Apparent magnitude  (J (2MASS))14.227 ± 0.029 [3]
Apparent magnitude  (H (2MASS))13.435 ± 0.033 [3]
Apparent magnitude  (Ks(2MASS))13.319 ± 0.039 [3]
Apparent magnitude  (w1 (WISE))12.956 ± 0.025 [3]
Apparent magnitude  (w2 (WISE))12.122 ± 0.025 [3]
Apparent magnitude  (w3 (WISE))10.964 ± 0.110 [3]
Astrometry
Proper motion (μ)RA: 664.047 mas/yr [1]
Dec.: -111.659 mas/yr [1]
Parallax (π)102.7966±0.8009  mas [1]
Distance 31.7 ± 0.2  ly
(9.73 ± 0.08  pc)
Other designations
WISE J203042.79+074934.7 [2] [3]
WISE J2030+0749 [2] [3]
Database references
SIMBAD data

WISE J2030+0749 is a nearby brown dwarf of spectral type T1.5, [2] [3] in the constellation Delphinus, approximately 31.7 light-years (9.7 parsecs ) from Earth. [1]

Contents

History of observations

The discovery of WISE J2030+0749 was announced in 2013 by Mace et al. [2] and independently by Bihain et al. [3]

Mace et al. selected T-type brown dwarf candidates from the WISE All-Sky source catalogue and carried out follow up observations using a variety of telescopes. On September 11, 2011 WISE J2030+0749 was observed using SpeX at the Infrared Telescope Facility (IRTF). The discovery paper was submitted to The Astrophysical Journal Supplement , accepted for publication on 2013 January 15 and published in March, 2013. The total number of brown dwarfs announced in Mace et al. (2013) is 87, all are of T-type. [2]

Bihain et al. selected sources with colours typical for T dwarfs from the WISE All-Sky source catalogue and checked them for high proper motion using older surveys: 2MASS, DENIS, SDSS, SSS, DSS and UKIDSS. Three objects among about ten candidates, including WISE J2030+0749, were selected for spectroscopic follow up with the Large Binocular Telescope (LBT). On November 8, 2012 Bihain et al. carried out follow up observations of WISE J2030+0749 with near-Infrared spectrograph LUCI 1 on LBT. On June 25, 2013 Astronomy & Astrophysics received the discovery paper, which was accepted for publication 10 July 2013. [3]

Distance

The distance of WISE J2030+0749 was estimated by Bihain et al. using mean absolute magnitudes of single T1/T2 dwarfs, derived by Dupuy & Liu (2012) from trigonometric parallaxes: [4] 10.5 ± 2.6 pc (34.2 ± 8.5 ly). [3]

Its parallax was later measured by the Gaia space telescope, with the Gaia DR3 parallax corresponding to a distance of 9.73±0.08  pc (31.7±0.2  ly ). [1]

See also

Two other T dwarfs, announced in Bihain et al (2013):

References

  1. 1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR .
  2. 1 2 3 4 5 6 Mace, Gregory N.; Kirkpatrick, J. Davy; Cushing, Michael C.; Gelino, Christopher R.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Eisenhardt, Peter R.; McLean, Ian S.; Thompson, Maggie A.; Mix, Katholeen; Bailey, Vanessa; Beichman, Charles A.; Bloom, Joshua S.; Burgasser, Adam J.; Fortney, Jonathan J.; Hinz, Philip M.; Knox, Russell P.; Lowrance, Patrick J.; Marley, Mark S.; Morley, Caroline V.; Rodigas, Timothy J.; Saumon, Didier; Sheppard, Scott S.; Stock, Nathan D. (2013). "A Study of the Diverse T Dwarf Population Revealed by WISE". The Astrophysical Journal Supplement . 205 (1): 6. arXiv: 1301.3913 . Bibcode:2013ApJS..205....6M. doi:10.1088/0067-0049/205/1/6. S2CID   10535516.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  3. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Bihain, Gabriel; Scholz, Ralf-Dieter; Storm, Jesper; Schnurr, Olivier (2013). "An overlooked brown dwarf neighbour (T7.5 at d~5pc) of the Sun and two additional T dwarfs at about 10pc". Astronomy & Astrophysics. 557: A43. arXiv: 1307.2722 . Bibcode:2013A&A...557A..43B. doi:10.1051/0004-6361/201322141. S2CID   118454396.
  4. ↑ 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.
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