2019
DOI: 10.3847/1538-4357/ab1018
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The Elusive Majority of Young Moving Groups. I. Young Binaries and Lithium-rich Stars in the Solar Neighborhood

Abstract: Young stars in the solar neighborhood serve as nearby probes of stellar evolution and represent promising targets to directly image self-luminous giant planets. We have carried out an all-sky search for late-type (≈K7-M5) stars within 100 pc selected primarily on the basis of activity indicators from GALEX and ROSAT . Approximately two thousand active and potentially young stars are identified, over 600 of which we have followed up with low-resolution optical spectroscopy and over 1000 with diffraction-limited… Show more

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Cited by 46 publications
(36 citation statements)
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References 161 publications
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“…The sky position definitively rules out membership with EPS, and membership to THO is marginally ruled out as the target is ∼5 • further north than the most northerly THO members in Bell, Murphy & Mamajek (2017), whereas it is very close to the centroid of 118TAU. We therefore assign this object as a member of 118TAU, which agrees with the recent designation by Bowler et al (2019).…”
Section: Stars With a Measured Rv That Pass All Kinematic Criteriasupporting
confidence: 85%
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“…The sky position definitively rules out membership with EPS, and membership to THO is marginally ruled out as the target is ∼5 • further north than the most northerly THO members in Bell, Murphy & Mamajek (2017), whereas it is very close to the centroid of 118TAU. We therefore assign this object as a member of 118TAU, which agrees with the recent designation by Bowler et al (2019).…”
Section: Stars With a Measured Rv That Pass All Kinematic Criteriasupporting
confidence: 85%
“…The fact that our CYS sample includes a handful of new MG candidates and more than a dozen previously identified nearby young stars, including the archetypical TW Hya, demonstrates the potential of our candidate selection criteria and follow-up kinematic test methods to identify such objects from among the field star population. Our yield of 16 young stars among 146 candidates (11 per cent) is comparable or better than those found in recent MG identification codes (Gagné et al 2014;Riedel et al 2017;Bowler et al 2019;Schneider et al 2019), where young star yields are generally far lower than 10 per cent. We note that there are 107 CYS that have no Li measurement as of yet, therefore our 11 per cent yield is a lower limit, and much likely to be higher given that the hit rate is ∼40 per cent amongst the 39 stars with Li measurements.…”
Section: New and Previously Established Mg Members: A Surprisingly Losupporting
confidence: 75%
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“…Indeed, early discoveries of debris disks around YMG members have been extremely important for the development of our understanding of planetary systems (Smith & Terrile 1984;Rebull et al 2008;Donaldson et al 2012;Riviere-Marichalar et al 2014;Moór et al 2016). The latertype members (spectral types K and later) of YMGs should form the majority of the population of these groups, but have only begun to be identified in large numbers in the last several years, partly with the arrival of kinematic data from the Gaia mission (e.g., Kraus et al 2014;Gaia Collaboration et al 2018;Gagné & Faherty 2018;Bowler et al 2019). However, ∼90% of all debris disks 23 imaged in scattered light are associated with spectral types earlier than K, due to observational limitations, or the higher surface brightness of disks associated with early-type stars that have higher luminosity.…”
Section: Introductionmentioning
confidence: 99%
“…Its spectral type in the literature ranges from M1.1 (Kraus et al 2014) to M3 (Torres et al 2000). A low-resolution optical spectra from 2014 was presented in Bowler et al (2019). They found a spectral type of M0 and an Hα EW of -3.2±0.3Å.…”
Section: Mass J02543316-5108313mentioning
confidence: 99%