TWO EXTRAORDINARY SUBSTELLAR BINARIES AT THE T/Y TRANSITION AND THE<i>Y</i>-BAND FLUXES OF THE COOLEST BROWN DWARFS<sup>,</sup>

Liu, Mengmeng; Dupuy, Trent J.; Bowler, Brendan P.; Leggett, S. K.; Best, William M. J.

doi:10.1088/0004-637x/758/1/57

Cited by 75 publications

(107 citation statements)

References 73 publications

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“…In the case of T dwarfs, several works have focused on studying the companions around these sources (e.g., Burgasser et al 2003Burgasser et al , 2006Bouy et al 2003Bouy et al , 2008Gelino et al 2011;Liu et al 2011Liu et al , 2012. Most of them have benefited from laser guide star (LGS) adaptive optics (AO) assisted observations at large ground-based telescopes or/and the Hubble Space Telescope (HST) data in order to achieve the best angular resolution and sensitivity.…”

Section: Or the Wide-field Infrared Survey Explorermentioning

confidence: 99%

“…As a result there are now ∼14 identified T-dwarf binaries. Most of them show very small separations (∼2-5 au, Burgasser et al 2003Burgasser et al , 2006Liu et al 2011), although there are also wide binaries that have been detected (e.g., WISEJ1711+3500, ρ = 15 ± 2 au, Liu et al 2012). In a recent work, Aberasturi et al (2014) have derived a binary A&A 578, A1 (2015) fraction of <16 or <25%, depending on the underlying mass ratio distribution.…”

Section: Or the Wide-field Infrared Survey Explorermentioning

confidence: 99%

“…For our study, we initially selected WISE T and Y dwarfs from this work. We kept only those observable from Paranal Observatory and never studied for multiplicity before Liu et al 2012).…”

Section: The Sample Of Brown Dwarfsmentioning

confidence: 99%

“…Finally, we also compared the photometry of the companion candidate with five Y dwarfs included in Liu et al (2012) and Leggett et al (2013). Since they all have HK s photometry in the MKO system, we have converted them to the 2MASS system following the same procedure described above.…”

Section: Wise 2255-3118mentioning

confidence: 99%

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WISE J061213.85-303612.5: a new T-dwarf binary candidate

Huélamo¹,

Ivanov²,

Kurtev

et al. 2015

A&A

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Context. T and Y dwarfs are among the coolest and least luminous objects detected, and they can help to understand the properties of giant planets. Up to now, there are more than 350 T dwarfs that have been identified thanks to large imaging surveys in the infrared, and their multiplicity properties can shed light on the formation process. Aims. The aim of this work is to look for companions around a sample of seven ultracoool objects. Most of them have been discovered by the WISE observatory and have not been studied before for multiplicity. Methods. We observed a sample six T dwarfs and one L9 dwarf with the Laser Guide Star (LGS) and NAOS-CONICA, the adaptive optics (AO) facility, and the near infrared camera at the ESO Very Large Telescope. We observed all the objects in one or more near-IR filters (JHK s ). Results. From the seven observed objects, we have identified a subarcsecond binary system, WISE J0612-3036, composed of two similar components with spectral types of T6. We measure a separation of ρ = 350 ± 5 mas and a position angle of PA = 235 ± 1 • . Using the mean absolute magnitudes of T6 dwarfs in the 2MASS JHK s bands, we estimate a distance of d = 31 ± 6 pc and derive a projected separation of ρ ∼ 11 ± 2 au. Another target, WISE J2255-3118, shows a very faint object at 1. 3 in the K s image. The object is marginally detected in H, and we derive a near infrared color of H − K s > 0.1 mag. HST/WFC3 public archival data reveals that the companion candidate is an extended source. Together with the derived color, this suggests that the source is most probably a background galaxy. The five other sources are apparently single, with 3-σ sensitivity limits between H = 19-21 for companions at separations ≥0. 5. Conclusions. WISE 0612-3036 is probably a new T-dwarf binary composed of two T6 dwarfs. As in the case of other late T-dwarf binaries, it shows a mass ratio close to 1, although its projected separation, ∼11 au, is larger than the average (∼5 au). Additional observations are needed to confirm that the system is bound.

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Section: Or the Wide-field Infrared Survey Explorermentioning

confidence: 99%

Section: Or the Wide-field Infrared Survey Explorermentioning

confidence: 99%

“…For our study, we initially selected WISE T and Y dwarfs from this work. We kept only those observable from Paranal Observatory and never studied for multiplicity before Liu et al 2012).…”

Section: The Sample Of Brown Dwarfsmentioning

confidence: 99%

Section: Wise 2255-3118mentioning

confidence: 99%

See 2 more Smart Citations

WISE J061213.85-303612.5: a new T-dwarf binary candidate

Huélamo¹,

Ivanov²,

Kurtev

et al. 2015

A&A

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“…The "Y" class, originally proposed by Kirkpatrick et al (1999), now consists of 15 members (Cushing et al 2011;Liu et al 2011;Kirkpatrick et al 2012;Tinney et al 2012) with spectral types equal to, or later than, Y0 (tentative classification) and effective temperatures below 500 K. Two additional candidates have been reported, but their faintness currently hampers spectral typing (Liu et al 2012;Luhman et al 2011).…”

Section: Introductionmentioning

confidence: 99%

GTC OSIRISz-band imaging of Y dwarfs

Lodieu

Béjar

Rebolo

2013

A&A

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Aims. The aim of the project is to contribute to the characterisation of the spectral energy distribution of the coolest brown dwarfs discovered to date, the Y dwarfs. Methods. We obtained z-band far-red imaging for six Y dwarfs and a T9+Y0 binary with the OSIRIS (Optical System for Imaging and low Resolution Integrated Spectroscopy) instrument on the 10.4-m Gran Telescopio de Canarias (GTC). Results. We detect five of the seven known Y dwarfs in the z-band, infer their optical-to-infrared colours, and measure their proper motions. We find a higher dispersion in the z − J and z − H colours of Y0 dwarfs than in T dwarfs. This dispersion is found to be correlated with H − w2. The high dispersion in the optical-to-infrared colours of Y dwarfs and the possible turnover towards bluer colours may be a consequence of the presence of sulfide clouds with different thicknesses, the depletion of alcalines, and/or gravity effects.

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Furthering our knowledge of the solar neighborhood using WISE

et al. 2013

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The launch of NASA's Wide‐field Infrared Survey Explorer (WISE) in late 2009 ushered in an new era in the study of the solar neighborhood. Its mid‐infrared capabilities have proven critical to the discovery of the bulk of the coolest (Teff < 1000 K) brown dwarfs, including the new Y dwarfs, and its all‐sky coverage lends itself to searches for high proper motions stars using other infrared surveys such as the Two Micron All Sky Survey (2MASS), UKIRT Infrared Deep Sky Survey (UKIDSS), and Visible and Infrared Survey Telescope for Astronomy (VISTA) surveys. This splinter session of the 17th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun was organized to bring together researchers working with WISE data to both identify brown dwarfs and characterize their properties. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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TWO EXTRAORDINARY SUBSTELLAR BINARIES AT THE T/Y TRANSITION AND THEY-BAND FLUXES OF THE COOLEST BROWN DWARFS^,

Cited by 75 publications

References 73 publications

WISE J061213.85-303612.5: a new T-dwarf binary candidate

WISE J061213.85-303612.5: a new T-dwarf binary candidate

GTC OSIRISz-band imaging of Y dwarfs

Furthering our knowledge of the solar neighborhood using WISE

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TWO EXTRAORDINARY SUBSTELLAR BINARIES AT THE T/Y TRANSITION AND THEY-BAND FLUXES OF THE COOLEST BROWN DWARFS,

Cited by 75 publications

References 73 publications

WISE J061213.85-303612.5: a new T-dwarf binary candidate

WISE J061213.85-303612.5: a new T-dwarf binary candidate

GTC OSIRISz-band imaging of Y dwarfs

Furthering our knowledge of the solar neighborhood using WISE

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TWO EXTRAORDINARY SUBSTELLAR BINARIES AT THE T/Y TRANSITION AND THEY-BAND FLUXES OF THE COOLEST BROWN DWARFS^,