The <i>Gaia</i> ultracool dwarf sample–IV. GTC/OSIRIS optical spectra of <i>Gaia</i> late-M and L dwarfs

ABSTRACT As part of our comprehensive, ongoing characterization of the low-mass end of the main sequence in the Solar neighbourhood, we used the OSIRIS instrument at the 10.4 m Gran Telescopio Canarias to acquire low- and mid-resolution (R${\approx }$300 and R${\approx }$2500) optical spectroscopy of 53 late-M and L ultracool dwarfs. Most of these objects are known but poorly investigated and lacking complete kinematics. We measured spectral indices, determined spectral types (six of which are new) and inferred effective temperature and surface gravity from BT-Settl synthetic spectra fits for all objects. We were able to measure radial velocities via line centre fitting and cross correlation for 46 objects, 29 of which lacked previous radial velocity measurements. Using these radial velocities in combination with the latest Gaia DR3 data, we also calculated Galactocentric space velocities. From their kinematics, we identified two candidates outside of the thin disc and four in young stellar kinematic groups. Two further ultracool dwarfs are apparently young field objects: 2MASSW J1246467+402715 (L4β), which has a potential, weak lithium absorption line, and G 196–3B (L3β), which was already known as young due to its well-studied primary companion.

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Journal
Monthly Notices of the Royal Astronomical Society
Published
2024-09-13
DOI
https://doi.org/10.1093/mnras/stae2102
Citations
1
Primary Topic
Stellar, planetary, and galactic studies
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article
Field-Weighted Citation Impact
0.33

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article

The Gaia ultracool dwarf sample–IV. GTC/OSIRIS optical spectra of Gaia late-M and L dwarfs

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Monthly Notices of the Royal Astronomical Society
Stellar, planetary, and galactic studies
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article

The Gaia ultracool dwarf sample–IV. GTC/OSIRIS optical spectra of Gaia late-M and L dwarfs

Z. H. Zhang, S. L. Folkes, L. M. Sarro, J. A. Caballero, Adam J. Burgasser, A. S. Rajpurohit, D. J. Pinfield, R. L. Smart, C. Reylé, J. Davy Kirkpatrick, Federico Marocco, Pier-Emmanuel Tremblay, H. R. A. Jones, Ben Burningham, D. Montes, William Cooper, A. Cabrera‐Lavers, Neil J. Cook, N. Lodieu, M. C. Gálvez-Ortiz, Jianzheng Shi, D. García-Álvarez, J F Faherty
article en
1 citations

Abstract

ABSTRACT As part of our comprehensive, ongoing characterization of the low-mass end of the main sequence in the Solar neighbourhood, we used the OSIRIS instrument at the 10.4 m Gran Telescopio Canarias to acquire low- and mid-resolution (R${\approx }$300 and R${\approx }$2500) optical spectroscopy of 53 late-M and L ultracool dwarfs. Most of these objects are known but poorly investigated and lacking complete kinematics. We measured spectral indices, determined spectral types (six of which are new) and inferred effective temperature and surface gravity from BT-Settl synthetic spectra fits for all objects. We were able to measure radial velocities via line centre fitting and cross correlation for 46 objects, 29 of which lacked previous radial velocity measurements. Using these radial velocities in combination with the latest Gaia DR3 data, we also calculated Galactocentric space velocities. From their kinematics, we identified two candidates outside of the thin disc and four in young stellar kinematic groups. Two further ultracool dwarfs are apparently young field objects: 2MASSW J1246467+402715 (L4β), which has a potential, weak lithium absorption line, and G 196–3B (L3β), which was already known as young due to its well-studied primary companion.

Monthly Notices of the Royal Astronomical SocietyVol. 534(1)
Physical Research Laboratory (IN), Universidad Complutense de Madrid (ES), California Institute of Technology (US), Centre National de la Recherche Scientifique (FR), American Museum of Natural History (US), University of Hertfordshire (GB), Universidad de La Laguna (ES), Universidad Nacional de Educación a Distancia (ES), Chinese Academy of Sciences (CN), University of California San Diego (US), University of Warwick (GB), Osservatorio Astrofisico di Torino (IT), Institut UTINAM (FR), Centro de Astrobiología (ES), Instituto de Astrofísica de Canarias (ES), Gran Telescopio Canarias (Spain) (ES), Observatoire des Sciences de l’Univers Terre Homme Environnement Temps Astronomie (FR), National Astronomical Observatories (CN), University of Chinese Academy of Sciences (CN), Infrared Processing and Analysis Center (US), Université de Montréal (CA), National Institute for Astrophysics (IT), Nanjing University (CN)
National Science Foundation, National Aeronautics and Space Administration, California Institute of Technology, European Space Agency, University of Hertfordshire, Chinese Academy of Sciences, Ministerio de Ciencia e Innovación, Instituto de Astrofísica de Canarias, Jet Propulsion Laboratory, Goddard Space Flight Center, University of California, Los Angeles, Science and Technology Facilities Council, European Regional Development Fund, Agencia Estatal de Investigación
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Stellar, planetary, and galactic studies
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