NEW M, L, AND T DWARF COMPANIONS TO NEARBY STARS FROM THE<i>WIDE-FIELD INFRARED SURVEY EXPLORER</i>

Luhman, K. L.; Loutrel, Nicholas; McCurdy, Nicholas S.; Mace, Gregory N.; Melso, Nicole; Star, Kimberly M.; Young, Michael D.; Terrien, Ryan C.; McLean, Ian S.; Kirkpatrick, J. Davy; Rhode, Katherine L.

doi:10.1088/0004-637x/760/2/152

Cited by 66 publications

(55 citation statements)

References 90 publications

(124 reference statements)

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“…Proper motions measured from the large surveys have enabled us to identify the substellar members of nearby young moving groups (e.g., Gagné et al 2015cGagné et al , 2015bFaherty et al 2016;Liu et al 2016), a population crucial to our understanding of brown dwarf evolution over their first few hundred million years. Proper motions from large catalogs have also identified wide, comoving companions to higher-mass stars, whose ages and metallicities can more easily be determined (e.g., Luhman et al 2012;Burningham et al 2013;Zhang et al 2013;Smith et al 2014a), making the ultracool companions important benchmarks for constraining atmospheric and evolutionary models.…”

Section: Introductionmentioning

confidence: 99%

Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3 π Survey

Best

Magnier

Liu

et al. 2017

ApJS

119

110

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractWe present a catalog of 9888 M, L and T dwarfs detected in the Pan-STARRS13π Survey (PS1), covering threequarters of the sky. Our catalog contains nearly all known objects of spectral types L0-T2 in the PS1 field, with objects as early as M0 and as late as T9, and includes PS1, 2MASS, AllWISE, and GaiaDR1 photometry. We analyze the different types of photometry reported by PS1 and use two types in our catalog in order to maximize both depth and accuracy. Using parallaxes from the literature, we construct empirical SEDs for field ultracool dwarfs spanning 0.5-12 μm. We determine typical colors of M0-T9 dwarfs and highlight the distinctive colors of subdwarfs and young objects. We combine astrometry from PS1, 2MASS, and GaiaDR1 to calculate new proper motions for our catalog. We achieve a median precision of 2.9mas yr −1 , a factor of ≈3−10 improvement over previous large catalogs. Our catalog contains proper motions for 2405M6-T9 dwarfs and includes the largest set of homogeneous proper motions for L and T dwarfs published to date, 406objects for which there were no previous measurements, and 1176objects for which we improve upon previous literature values. We analyze the kinematics of ultracool dwarfs in our catalog and find evidence that bluer but otherwise generic late-M and Lfield dwarfs (i.e., not subdwarfs) tend to have tangential velocities higher than those of typical field objects. With the public release of the PS1 data, this survey will continue to be an essential tool for characterizing the ultracool dwarf population.

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Section: Introductionmentioning

confidence: 99%

Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3 π Survey

Best

Magnier

Liu

et al. 2017

ApJS

119

110

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“…A summary of discoveries prior to 2010 is presented in Faherty et al (2010). Since then wide-field surveys such as Sloan Digital Sky Survey (SDSS; Ahn et al 2012; see studies by Zhang et al 2010;Dhital et al 2010) and WISE (Wright et al 2010; see work by Luhman et al 2012;Wright et al 2013) have been used to identify wide companions to stars. As these surveys are either single epoch or taken over a short period of time, they often require additional data sets, such as Two Micron All Sky Survey (2MASS; Skrutskie et al 2006), to allow the identification of companions from their common proper motion with the primary.…”

Section: Introductionmentioning

confidence: 99%

WIDE COOL AND ULTRACOOL COMPANIONS TO NEARBY STARS FROM Pan-STARRS 1

Deacon

Liu

Magnier

et al. 2014

ApJ

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We present the discovery of 57 wide (>5 ) separation, low-mass (stellar and substellar) companions to stars in the solar neighborhood identified from Pan-STARRS 1 (PS1) data and the spectral classification of 31 previously known companions. Our companions represent a selective subsample of promising candidates and span a range in spectral type of K7-L9 with the addition of one DA white dwarf. These were identified primarily from a dedicated common proper motion search around nearby stars, along with a few as serendipitous discoveries from our Pan-STARRS 1 brown dwarf search. Our discoveries include 23 new L dwarf companions and one known L dwarf not previously identified as a companion. The primary stars around which we searched for companions come from a list of bright stars with well-measured parallaxes and large proper motions from the Hipparcos catalog (8583 stars, mostly A-K dwarfs) and fainter stars from other proper motion catalogs (79170 stars, mostly M dwarfs). We examine the likelihood that our companions are chance alignments between unrelated stars and conclude that this is unlikely for the majority of the objects that we have followed-up spectroscopically. We also examine the entire population of ultracool (>M7) dwarf companions and conclude that while some are loosely bound, most are unlikely to be disrupted over the course of ∼10 Gyr. Our search increases the number of ultracool M dwarf companions wider than 300 AU by 88% and increases the number of L dwarf companions in the same separation range by 82%. Finally, we resolve our new L dwarf companion to HIP 6407 into a tight (0. 13, 7.4 AU) L1+T3 binary, making the system a hierarchical triple. Our search for these key benchmarks against which brown dwarf and exoplanet atmosphere models are tested has yielded the largest number of discoveries to date.

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“…Therefore, the searches for unknown nearby sources gradually turn to the NIR wavelengths taking advantage of improved camera sensitivities, spatial and temporal resolution (Deacon et al 2009;Kirkpatrick et al 2010;Smith et al 2014), yielding in the last twenty years the discovery of over two thousand ultra-cool dwarfs. Widening the color space of the searches has helped to improve the stellar and sub-stellar density estimates in the solar neighborhood, and the frequency of low-mass companions, among other questions (Allen et al 2012;Luhman et al 2012;Dieterich et al 2012;Ivanov et al 2013;Deacon et al 2014;Davison et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric characterization of high proper motion sources fromWISE

Beamín

Ivanov

Minniti

et al. 2015

Mon. Not. R. Astron. Soc.

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The census of the solar neighborhood is almost complete for stars and becoming more complete in the brown dwarf regime. Spectroscopic, photometric and kinematic characterization of nearby objects helps us to understand the local mass function, the binary fraction, and provides new targets for sensitive planet searches. We aim to derive spectral types and spectro-photometric distances of a sample of new high proper motion sources found with the WISE satellite, and obtain parallaxes for those objects that fall within the area observed by the Vista Variables in the Vía Láctea survey (VVV). We used low resolution spectroscopy and template fitting to derive spectral types, multiwavelength photometry to characterize the companion candidates and obtain photometric distances. Multi-epoch imaging from the VVV survey was used to measure the parallaxes and proper motions for three sources. We confirm a new T2 brown dwarf within ∼15 pc. We derived optical spectral types for twenty four sources, mostly M dwarfs within 50 pc. We addressed the wide binary nature of sixteen objects found by the WISE mission and previously known high proper motion sources. Six of these are probably members of wide binaries, two of those are new, and present evidence against the physical binary nature of two candidate binary stars found in the literature, and eight that we selected as possible binary systems. We discuss a likely microlensing event produced by a nearby low mass star and a galaxy, that is to occur in the following five years.

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NEW M, L, AND T DWARF COMPANIONS TO NEARBY STARS FROM THEWIDE-FIELD INFRARED SURVEY EXPLORER

Cited by 66 publications

References 90 publications

Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3 π Survey

Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3 π Survey

WIDE COOL AND ULTRACOOL COMPANIONS TO NEARBY STARS FROM Pan-STARRS 1

Spectrophotometric characterization of high proper motion sources fromWISE

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