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The Solar Neighborhood. XXXX. Parallax Results from the CTIOPI 0.9 m Program: New Young Stars Near the Sun

Bartlett, Jennifer L. and Lurie, John C. and Riedel, Adric and Ianna, Philip A. and Jao, Wei-Chun and Henry, Todd J. and Winters, Jennifer G. and Finch, Charlie T. and Subasavage, John P. (2017) The Solar Neighborhood. XXXX. Parallax Results from the CTIOPI 0.9 m Program: New Young Stars Near the Sun. Astronomical Journal, 154 (4). Art. No. 151. ISSN 1538-3881. doi:10.3847/1538-3881/aa8457.

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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 Observatory 0.9 m and 1.5 m telescopes. Astrometry from 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 motions larger 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 astrometry and 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 parallax placing 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.

Item Type:Article
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URLURL TypeDescription
Bartlett, Jennifer L.0000-0001-7394-4545
Lurie, John C.0000-0002-8114-0835
Riedel, Adric0000-0003-1645-8596
Jao, Wei-Chun0000-0003-0193-2187
Winters, Jennifer G.0000-0001-6031-9513
Subasavage, John P.0000-0001-5912-6191
Additional Information:© 2017 American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2016 June 21; revised 2017 August 1; accepted 2017 August 2; published 2017 September 15. The astrometric observations reported here began as part of the NOAO Surveys Program in 1999 and continued on the CTIO/SMARTS 0.9 m via the SMARTS Consortium starting in 2003. We gratefully acknowledge support from the National Science Foundation (NSF; grants AST 05-07711, AST 09-08402, and AST 14-12026), the National Aeronautics and Space Administration's (NASA) Space Interferometry Mission (SIM), and Georgia State University, which together have made this long-term effort possible. In addition, J.L.B. acknowledges support from the University of Virginia, Hampden-Sydney College, and the Levinson Fund of the Peninsula Community Foundation. We thank the members of the SMARTS Consortium, who enable the operations of the small telescopes at CTIO, as well as the supporting observers at CTIO, specifically Edgardo Cosgrove, Arturo Gómez, Alberto Miranda, and Joselino Vásquez. In addition, we thank Kenneth Slatten for his meticulous review of the manuscript. This research consulted the Set of Identifications, Measurements, and Bibliography for Astronomical Data (SIMBAD) database and the VizieR catalog access tool (Ochsenbein et al. 2000), both of which are operated at Centre de Données astronomiques de Strasbourg (CDS), Strasbourg, France. This investigation also used data products from 2MASS, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center (IPAC) at the California Institute of Technology funded by NASA and the NSF. In addition, this study accessed the Washington Double Star Catalog maintained at the U.S. Naval Observatory. RECONS' primary observing programs are carried out by the SMARTS Consortium, which operates four telescopes in the Chilean Andes under the auspices of the National Optical Astronomy Observatory (NOAO) and the NSF. This work used data from the European Space Agency (ESA) mission Gaia,20 processed by the Gaia Data Processing and Analysis Consortium (DPAC);21 national institutions, in particular the institutions participating in the Gaia Multilateral Agreement provide funding for DPAC. Finally, computations herein employed the UVW Calculator developed by David Rodriguez.22 Facilities: CTIO:0.9m - Cerro Tololo Inter-American Observatory's 0.9 meter Telescope, CTIO:1.5m - Cerro Tololo Inter-American Observatory's 1.5 meter Telescope. Software: IRAF (, SExtractor (, GaussFit (, LACEwING (, BANYAN II (, UVW Calculator (
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
NSFAST 05-07711
NSFAST 09-08402
NSFAST 14-12026
Georgia State UniversityUNSPECIFIED
University of VirginiaUNSPECIFIED
Hampden-Sydney CollegeUNSPECIFIED
Peninsula Community FoundationUNSPECIFIED
Subject Keywords:open clusters and associations: general – parallaxes – proper motions – solar neighborhood – stars: fundamental parameters – stars: late-type
Issue or Number:4
Record Number:CaltechAUTHORS:20170915-112502794
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Official Citation:Jennifer L. Bartlett et al 2017 AJ 154 151
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81486
Deposited By: Tony Diaz
Deposited On:15 Sep 2017 18:35
Last Modified:15 Nov 2021 19:43

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