The Solar Neighborhood. XXXX. Parallax Results from the CTIOPI 0.9 m Program: New Young Stars Near the Sun
2017
As a step toward completing and characterizing the census of the solar neighborhood, we present astrometric, photometric, and spectroscopic observations of 32 systems observed with the
Cerro Tololo Inter-American Observatory0.9 m and 1.5 m telescopes.
Astrometryfrom the 0.9 m indicates that among the 17 systems that had no previous published trigonometric
parallaxes, 14 are within 25 pc. In the full sample, nine systems have
proper motionslarger than 0.”5 yr^(−1), including 2MASS J02511490-0352459, which exceeds 2.”0 yr^(−1). VRI photometry from the 0.9 m and optical spectra from the 1.5 m indicate that the targets have V = 11–22 mag and spectral types M3.0V–L3.0V. For 2MASS J23062928-0502285 (
TRAPPIST-1), we present updated
astrometryand photometric variability based on over 12 years of observations. Of the nine binaries in the sample, two promise mass determinations in the next decade: LHS 6167AB, an M4.5V system for which we present an accurate
parallaxplacing the binary at 9.7 pc, and 2MASS J23515048-2537367AB, an M8.5V system at 21.1 pc for which we present the first evidence of an unseen, low-mass companion. Most importantly, Na I and K I gravity indicators, Hα measurements, long-term photometric variability, locations on the H-R diagram, and kinematic assessments indicate that as many as 13 of the systems are young, including candidate members of young moving groups, with ages less than ~120 Myr.
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