The Smallest Mass Ratio Young Star Spectroscopic Binaries

Abstract

Using high resolution near-infrared spectroscopy with the Keck telescope, we have detected the radial velocity signatures of the cool secondary components in four optically identified pre-main-sequence, single-lined spectroscopic binaries. All are weak-lined T Tauri stars with well-defined center of mass velocities. The mass ratio for one young binary, NTTS 160905-1859, is M2/M1 = 0.18+/-0.01, the smallest yet measured dynamically for a pre-main-sequence spectroscopic binary. These new results demonstrate the power of infrared spectroscopy for the dynamical identification of cool secondaries. Visible light spectroscopy, to date, has not revealed any pre-main-sequence secondary stars with masses <0.5 M_sun, while two of the young systems reported here are in that range. We compare our targets with a compilation of the published young double-lined spectroscopic binaries and discuss our unique contribution to this sample.

Accepted for publication in the April, 2002, ApJ; 6 figures

References in corpus (4)

• Observational Constraints on the Formation and Evolution of Binary Stars
• A Dynamical Mass Constraint for Pre-Main-Sequence Evolutionary Tracks: The Binary NTT 045251+3016
• Mass ratios of the components in T Tauri binary systems and implications for multiple star formation
• IR Detection of Low-Mass Secondaries in Spectroscopic Binaries

Cited by in corpus (56)

• A Census of the Young Cluster IC 348
• The Role of Multiplicity in Disk Evolution and Planet Formation
• The Gould's Belt Distances Survey (GOBELINS) II. Distances and structure towards the Orion Molecular Clouds
• Demographics of Transition Objects
• Pseudo-viscous modeling of self-gravitating discs and the formation of low mass ratio binaries
• The SDSS-III APOGEE Spectral Line List for H-band Spectroscopy
• Astrophysics of Young Star Binaries
• X-ray emission from early-type stars in the Orion Nebula Cluster
• Pre-main sequence spectroscopic binaries suitable for VLTI observations
• A Surprising Reversal of Temperatures in the Brown-Dwarf Eclipsing Binary 2MASS J05352184-0546085
• Unusually Wide Binaries: Are They Wide or Unusual?
• Refining the Census of the Upper Scorpius Association with Gaia
• Multi-order TODCOR: application to observations taken with the CORALIE echelle spectrograph
• The NIRSPEC Brown Dwarf Spectroscopic Survey II: High-Resolution J-Band Spectra of M, L and T Dwarfs
• The Mass Ratio Distribution in Main-Sequence Spectroscopic Binaries Measured by IR Spectroscopy
• Beta Pictoris and AB Doradus Moving Groups: Likely New Low-Mass Members
• Initial Results from the Palomar Adaptive Optics Survey of Young Solar-Type Stars: a Brown Dwarf and Three Stellar Companions
• A Census of the Stellar Populations in the Sco-Cen Complex
• Component Masses of the Young Spectroscopic Binary UZ Tau E
• A Survey for Young Spectroscopic Binary K7-M4 Stars in Ophiuchus
• An Upper Bound on the Flux Ratio of rho CrB's Companion at 1.6um
• The Detection of Low Mass Companions in Hyades Cluster Spectroscopic Binary Stars
• Discovery of a Very Low Mass Triple with Late-M and T Dwarf Components: LP 704-48/SDSS J0006-0852AB
• The GL 569 Multiple System
• 16-20 Jupiter mass RV companion orbiting the brown dwarf candidate ChaHa8
• Planets Around Low-Mass Stars (PALMS). V. Age-Dating Low-Mass Companions to Members and Interlopers of Young Moving Groups
• The influence of radiative core growth on coronal X-ray emission from pre-main sequence stars
• A nearby young M dwarf with a wide, possibly planetary-mass companion
• Orbit and Stellar Properties of the Young Triple V807 Tau
• A double-lined spectroscopic orbit for the young star HD 34700
• The quadruple pre-main sequence system LkCa3: Implications for stellar evolution models
• Effective Temperatures of Low-Mass Stars from High-Resolution H-band Spectroscopy
• Preliminary Orbit of the Young Binary Haro 1-14c
• The TWA 3 Young Triple System: Orbits, Disks, Evolution
• Brackett Lines from the Super Star Cluster Nebulae in He 2-10
• The Evolution of Circumstellar Disks Surrounding Intermediate Mass Stars: IC 1805
• An Association in the Aquila Star-Forming Region: High Resolution Infrared Spectroscopy of T Tauri Stars
• The Double-Lined Spectroscopic Binary Haro 1-14c
• Spectral analysis of high resolution near-infrared spectra of ultra cool dwarfs
• The Highly Eccentric Pre-Main Sequence Spectroscopic Binary RX J0529.3+1210
• Orbital and physical parameters of eclipsing binaries from the All-Sky Automated Survey catalogue - X. Three high-contrast systems with secondaries detected with IR spectroscopy
• VLT/NACO adaptive optics imaging of the TY CrA system - A fourth stellar component candidate detected
• S and VV Corona Australis: Spectroscopic Variability in Two Young Binary Star Systems
• Orbital Solutions for Two Young, Low-Mass Spectroscopic Binaries in Ophiuchus
• A Search For X-ray Emission From Colliding Magnetospheres In Young Eccentric Stellar Binaries
• Direct Spectral Detection: An Efficient Method to Detect and Characterize Binary Systems
• Dynamical Measurements of the Young Upper Scorpius Triple NTTS 155808-2219
• Orbital Parameters for the Two Young Binaries VSB 111 and VSB 126
• The SDSS-HET Survey of Kepler Eclipsing Binaries. Description of the Survey and First Results
• Orbital Solution for the Spectroscopic Binary in the GW Ori Hierarchical Triple
• IN-SYNC. VII. Evidence for a decreasing spectroscopic binary fraction from 1 to 100 Myr within the IN-SYNC sample
• Spectroscopy of Candidate Members of the Sco-Cen Complex
• Characterisation of close visual binaries from the AstraLux Large M Dwarf Survey
• A young hierarchical triple system harbouring a candidate debris disc
• Star-Crossed Lovers DI Tau A and B: Orbit Characterization and Physical Properties Determination
• RX J0513.1+0851 AND RX J0539.9+0956: Two Young, Rapidly Rotating, Spectroscopic Binary Stars