Wisep J180026.60+013453.1: A Nearby Late-L Dwarf Near the Galactic Plane

Gizis, John E.; Burgasser, Adam J.; Faherty, Jacqueline K.; Castro, Philip J.; Shara, Michael M.

doi:10.1088/0004-6256/142/5/171

Cited by 22 publications

(15 citation statements)

References 54 publications

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“…Additional dwarfs were discovered and studied afterwards Gizis et al 2011;Kirkpatrick et al 2012), and we included them in our target list. Finally, we also considered several bright targets (mainly previously known L-type and early-T dwarfs) as backups to be observed under bad conditions.…”

Section: The Sample Of Brown Dwarfsmentioning

confidence: 99%

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: The Sample Of Brown Dwarfsmentioning

confidence: 99%

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

Huélamo¹,

Ivanov²,

Kurtev

et al. 2015

A&A

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“…Kinematic searches, on the other hand, avoid such a bias by using proper motion alone as a judge of distance. By identifying objects with large proper motions, unusual brown dwarfs overlooked by previous surveys can be identified (e.g., Metchev et al 2008;Deacon et al 2009;Sheppard & Cushing 2009;Artigau et al 2010;Kirkpatrick et al 2010;Deacon et al 2011;Gizis et al 2011;Liu et al 2011;Scholz et al 2011Scholz et al , 2012Scholz 2014).…”

Section: Introductionmentioning

confidence: 99%

A Proper Motion Survey Using the First Sky Pass of Neowise-Reactivation Data

Schneider

Greco

Cushing

et al. 2016

ApJ

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The Wide-field Infrared Survey Explorer (WISE) was reactivated in 2013 December (NEOWISE) to search for potentially hazardous near-Earth objects. We have conducted a survey using the first sky pass of NEOWISE data and the AllWISE catalog to identify nearby stars and brown dwarfs with large proper motions ( total m  250 mas yr −1 ). A total of 20,548 high proper motion objects were identified, 1006 of which are new discoveries. This survey has uncovered a significantly larger sample of fainter objects (W 2 13  mag) than the previous WISE motion surveys of Luhman and Kirkpatrick et al. Many of these objects are predicted to be new L and T dwarfs based on near-and mid-infrared colors. Using estimated spectral types along with distance estimates, we have identified several objects that likely belong to the nearby solar neighborhood (d < 25 pc). We have followed up 19 of these new discoveries with near-infrared or optical spectroscopy, focusing on potentially nearby objects, objects with the latest predicted spectral types, and potential late-type subdwarfs. This subset includes six M dwarfs, five of which are likely subdwarfs, as well as eight L dwarfs and five T dwarfs, many of which have blue near-infrared colors. As an additional supplement, we provide 2MASS and AllWISE positions and photometry for every object found in our search, as well as 2MASS/AllWISE calculated proper motions.

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“…Although currently 6 pc distant, it likely passed within 0.25 pc from the Sun in the last 70 kyr (Mamajek et al 2015). WISEP J180026.60+013453.1 (hereafter W1800+0134) was discovered by Gizis et al (2011) using the Wide-field Infrared Survey Explorer (Wright et al 2010) and Two Micron All-Sky Survey (Skrutskie et al 2006). We classified W1800+0134 as an L7.5 dwarf in the near-infrared and estimated its distance as 8.8 ± 1.0 pc.…”

Section: Introductionmentioning

confidence: 99%

Properties of the Nearby Brown Dwarf Wisep J180026.60+013453.1

Gizis

Burgasser

Vrba

2015

Self Cite

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We present new spectroscopy and astrometry to characterize the nearby brown dwarf WISEP J180026.60+013453.1. The optical spectral type, L7.5, is in agreement with the previously reported near-infrared spectral type. The preliminary trigonometric parallax places it at a distance of 8.01 ± 0.21 pc, confirming that it is the fourth closest known late-L (L7-L9) dwarf. The measured luminosity, our detection of lithium, and the lack of low surface gravity indicators indicates that WISEP J180026.60+013453.1 has a mass 0.03 < M < 0.06M and an age between 300 million and 1.5 billion years according to theoretical substellar evolution models. The low space motion is consistent with this young age. We have measured the rotational broadening (v sin i = 13.5 ± 0.5 km s −1 ), and use it to estimate a maximum rotation period of 9.3 hr.

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Wisep J180026.60+013453.1: A Nearby Late-L Dwarf Near the Galactic Plane

Cited by 22 publications

References 54 publications

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

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

A Proper Motion Survey Using the First Sky Pass of Neowise-Reactivation Data

Properties of the Nearby Brown Dwarf Wisep J180026.60+013453.1

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