VVV BD001

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Coordinates: Sky map 17h 26m 40.2s, −27° 38′ 03″

VVV BD001
New Cool Starlet in Our Backyard.jpg
VVV BD001 is a brown dwarf located about 55 light-years away from Earth.[1]
Credit: ESO, and D. Minniti and J. C. Beamín (Pontificia Universidad Católica de Chile).
Observation data
Epoch       Equinox J2000[2]
Constellation Ophiuchus
Right ascension 17h 26m 40.2s[2]
Declination −27° 38′ 03″[2]
Characteristics
Spectral type L5 ± 1[2]
Apparent magnitude (Z) 15.507 ± 0.015[2]
Apparent magnitude (Y) 14.379 ± 0.012[2]
Apparent magnitude (J) 13.267 ± 0.017[2]
Apparent magnitude (H) 12.668 ± 0.016[2]
Apparent magnitude (KS) 12.194 ± 0.015[2]
Astrometry
Proper motion (μ) RA: -545.5 ± 4[2] mas/yr
Dec.: -325.5 ± 4[2] mas/yr
Parallax (π) 57 ± 4[2] mas
Distance 57 ± 4 ly
(18 ± 1 pc)
Other designations
VVV BD001[2]
VVV J172640.2-273803[2]

VVV BD001 is a nearby brown dwarf of spectral type L5 ± 1, located in constellation Ophiuchus towards the Galactic bulge (Galactic Center region)[~ 1] at approximately 57 light-years from Earth.[2]

History of observations[edit]

Discovery[edit]

VVV BD001 was discovered in 2013 by Juan Carlos Beamín et al. from its high proper motion. It was detected on images, obtained under the ESO public survey Vista Variables in the Vía Láctea (VVV), which was carried out with the VIRCAM on the 4.1-meter VISTA telescope at ESO Paranal Observatory, Chile. (The data of this survey are publicly available through the VISTA Science Archive).

Beamín et al. detected high proper motion objects through a visual inspection of combined VVV images, comprised from three images in the same band (KS), obtained in different epochs: 2010, 2011 and 2012, colored in red, green and blue, respectively. While on combined images low-proper motion objects become white, high-proper motion objects leave a red-green-blue color trace, visually identified. Then the high-proper motion objects were checked with blinking of VVV images and using images from other surveys — 2MASS and SuperCosmos. Thus Beamín et al. detected about 200 high-proper motion objects, of which VVV BD001 was the first selected for spectroscopic follow-up observations.

On the night of March 29/30, 2013 they carried out its follow-up spectroscopy with a Folded-port InfraRed Echellette (FIRE) at the 6.5-meter Magellan Baade telescope at Las Campanas Observatory, Chile. Also, VVV BD001 was precovered on images from other surveys: 2MASS, DENIS, WISE and GLIMPSEII Legacy Survey (Spitzer/IRAC). In the SuperCosmos optical images nothing was detected.[2]

On July 1, 2013 discovery paper of VVV BD001 by Beamín et al. was received[3],[~ 2] on August 12, 2013 it was accepted for publication, on August 14, 2013 it was submitted to arXiv, and in September 2013 it was published in Astronomy & Astrophysics.[3]

VVV BD001 is the first brown dwarf detected by the VVV survey. Also, it is the first brown dwarf located towards the Galactic center (the most crowded region of the sky) discovered.[2]

Distance[edit]

Trigonometric parallax of VVV BD001, published in its discovery paper, is 57 ± 4 mas, corresponding to a distance 17.5+1.3
−1.2
pc, or 57.2+4.3
−3.8
ly.[2]

VVV BD001 distance estimates

Source Parallax, mas Distance, pc Distance, ly Ref.
Beamín et al. (2013) 57 ± 4 17.5+1.3
−1.2
57.2+4.3
−3.8
[2]

The best estimate is marked in bold.

Properties[edit]

VVV BD001 is classified as an unusually blue L dwarf.[2]

Notes[edit]

  1. ^ Despite this, VVV BD001 is located in Solar neighbourhood, not in the Galactic center region, — between us and Galactic center, so it is projected on the Galactic center from ours viewpoint, however, staying much closer to us (~57 ly) than to Galactic center (~30000 ly).
  2. ^ On July 04, 2013, according arXiv e-print.

References[edit]

  1. ^ "New Cool Starlet in Our Backyard". ESO Picture of the Week. Retrieved 25 September 2013. 
  2. ^ a b c d e f g h i j k l m n o p q r s t Beamín, J. C.; Minniti, D.; Gromadzki, M.; Kurtev, R.; Ivanov, V. D.; Beletsky, Y.; Lucas, P.; Saito, R. K.; Borissova, J. (2013). "One more neighbor: The first brown dwarf in the VVV survey". arXiv:1308.3216v1 [astro-ph.SR]. Bibcode 2013arXiv1308.3216B.
  3. ^ a b Beamín, J. C.; Minniti, D.; Gromadzki, M.; Kurtev, R.; Ivanov, V. D.; Beletsky, Y.; Lucas, P.; Saito, R. K.; Borissova, J. (2013). "One more neighbor: The first brown dwarf in the VVV survey". Astronomy & Astrophysics 557: L8. arXiv:1308.3216. Bibcode:2013A&A...557L...8B. doi:10.1051/0004-6361/201322190.  edit