Southern infrared proper motion survey. II. A sample of low
 mass stars with $\mathsf{\mu \geq 0.1''/ {yr}}$

Deacon, N. R.; Hambly, N. C.

doi:10.1051/0004-6361:20066844

Cited by 53 publications

(40 citation statements)

References 30 publications

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“…The astrometry and photometry for each pair of stars have been adopted from our re-reduction of the 2MASS atlas images (KH07a). a Deacon & Hambly (2007) identified SIPS1610-1917, but inspection of the original photographic plates shows that SIPS1610-1917 is the candidate companion that we identified in KH07a (2M16103950-1917073). Its high proper motion demonstrates that it is a field star, not a bound companion.…”

Section: Imagingmentioning

confidence: 83%

Unusually Wide Binaries: Are They Wide or Unusual?

Kraus

Hillenbrand

2009

ApJ

102

110

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We describe an astrometric and spectroscopic campaign to confirm the youth and association of a complete sample of candidate wide companions in Taurus and Upper Sco. Our survey found 15 new binary systems (three in Taurus and 12 in Upper Sco) with separations of 3 -30 (500-5000 AU) among all of the known members with masses of 2.5-0.012 M . The total sample of 49 wide systems in these two regions conforms to only some expectations from field multiplicity surveys. Higher mass stars have a higher frequency of wide binary companions, and there is a marked paucity of wide binary systems near the substellar regime. However, the separation distribution appears to be log-flat, rather than declining as in the field, and the mass ratio distribution is more biased toward similar-mass companions than the initial mass function or the field G-dwarf distribution. The maximum separation also shows no evidence of a limit at 5000 AU until the abrupt cessation of any wide binary formation at system masses of ∼0.3 M . We attribute this result to the post-natal dynamical sculpting that occurs for most field systems; our binary systems will escape to the field intact, but most field stars are formed in denser clusters and undergo significant dynamical evolution. In summary, only wide binary systems with total masses 0.3 M appear to be "unusually wide."

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Section: Imagingmentioning

confidence: 83%

Unusually Wide Binaries: Are They Wide or Unusual?

Kraus

Hillenbrand

2009

ApJ

102

110

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“…2MASS J01392170-3936088: The photometric distance to this source computed in Deacon & Hambly (2007 (Figure 2) does not look unusual. This is now added to the list of stars within 10 pc.…”

Section: Notes On Interesting Individual Sourcesmentioning

confidence: 84%

Trigonometric Parallaxes and Proper Motions of 134 Southern Late M, L, and T Dwarfs From the Carnegie Astrometric Planet Search Program

Weinberger

Boss

Keiser

et al. 2016

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We report trigonometric parallaxes for 134 low-mass stars and brown dwarfs, of which 38 have no previously published measurement and 79 more have improved uncertainties. Our survey focused on nearby targets, so 119 are closer than 30 pc. Of the 38 stars with new parallaxes, 14 are within 20 pc and seven are likely brown dwarfs (spectral types later than L0). These parallaxes are useful for studies of kinematics, multiplicity, and spectrophotometric calibration. Two objects with new parallaxes are confirmed as young stars with membership in nearby young moving groups: LP 870-65 in AB Doradus and G 161-71 in Argus. We also report the first parallax for the planet-hosting star GJ 3470; this allows us to refine the density of its Neptune-mass planet. T-dwarf 2MASS J12590470-4336243, previously thought to lie within 4 pc, is found to be at 7.8 pc, and the M-type star 2MASS J01392170-3936088 joins the ranks of nearby stars as it is found to be within 10 pc. Five stars that are overluminous and/or too red for their spectral types are identified and deserve further study as possible young stars.

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“…In order to determine if a confirmed proper motion source is known or is a new discovery, we rely primarily on the SIMBAD database. We also checked catalogs of targeted searches for high proper motion objects (e.g., Pokorny et al 2004;Lépine & Shara 2005;Deacon & Hambly 2007;Boyd et al 2011;Luhman 2014a, andKirkpatrick et al 2014). Note that we only cross-match with catalogs made up of bona fide proper motion sources, not unvetted lists of candidates (e.g., Gagné et al 2015).…”

Section: Survey Resultsmentioning

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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Southern infrared proper motion survey. II. A sample of low mass stars with $\mathsf{\mu \geq 0.1''/ {yr}}$

Cited by 53 publications

References 30 publications

Unusually Wide Binaries: Are They Wide or Unusual?

Unusually Wide Binaries: Are They Wide or Unusual?

Trigonometric Parallaxes and Proper Motions of 134 Southern Late M, L, and T Dwarfs From the Carnegie Astrometric Planet Search Program

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

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