Unveiling new members in five nearby young moving groups

Abstract

In the last decade many kinematic groups of young stars (<100 Myr) were discovered in the solar neighbourhood. Since the most interesting period of planet formation overlaps with the age of these groups, their well dated members are attractive targets for exoplanet searches by direct imaging. We combined astrometric, photometric and X-ray data, and applied strict selection criteria to explore the stellar content of five nearby moving groups. We identified more than 100 potential new candidate members in the ß Pic moving group, and in the Tucana-Horologium, Columba, Carina, and Argus associations. In order to further assess and confirm their membership status, we analysed radial velocity data and lithium equivalent widths extracted from high-resolution spectra of 54 candidate stars. We identified 35 new probable/possible young moving group members: 4 in the ß Pic moving group, 11 in the Columba association, 16 in the Carina association, and 4 in the Argus association. We found serendipitiously a new AB Dor moving group member as well. For four Columba systems Hipparcos based parallaxes have already been available and as they are consistent with the predicted kinematic parallaxes, they can be considered as secure new members.

Accepted for publication in MNRAS, 14 pages, 3 figures, 3 tables

References in corpus (11)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)
• Search for Associations Containing Young stars (SACY): I. Sample & Searching Method
• Variations on Debris Disks: Icy Planet Formation at 30-150 AU for 1-3 Solar Mass Main Sequence Stars
• Direct Imaging Discovery of a `Super-Jupiter' Around the late B-Type Star Kappa And
• Lithium Depletion of Nearby Young Stellar Associations
• A novel L-band imaging search for giant planets in the Tucana and Beta Pictoris moving groups
• Formation and Evolution of Planetary Systems: Upper Limits to the Gas Mass in Disks Around Sun-like Stars
• Accretion Disks around Young Stars: Lifetimes, Disk Locking and Variability
• On the kinematic evolution of young local associations and the Sco-Cen complex
• Nearby young stars selected by proper motion. I. Four new members of the Beta Pictoris moving group from the Tycho-2 catalog

Cited by in corpus (36)

• BANYAN. XI. The BANYAN $\Sigma$ multivariate Bayesian algorithm to identify members of young associations within 150 pc
• Imaging Extrasolar Giant Planets
• BANYAN. III. Radial velocity, Rotation and X-ray emission of low-mass star candidates in nearby young kinematic groups
• A Statistical Analysis of SEEDS and Other High-Contrast Exoplanet Surveys: Massive Planets or Low-Mass Brown Dwarfs?
• The International Deep Planet Survey II: The frequency of directly imaged giant exoplanets with stellar mass
• BANYAN. V. A Systematic All-Sky Survey for New Very Late-Type Low-Mass Stars and Brown Dwarfs in Nearby Young Moving Groups
• All-sky Co-moving Recovery Of Nearby Young Members. (ACRONYM) II: The Beta Pictoris Moving Group
• The VLT/NaCo Large program to probe the occurrence of exoplanets and brown dwarfs in wide orbits: I- Sample definition and characterization
• The Nearby, Young, Argus Association: Membership, Age, and Dusty Debris Disks
• LACEwING: A New Moving Group Analysis Code
• Stirring in massive, young debris discs from spatially resolved Herschel images
• The rotation - Lithium depletion correlation in the beta Pictoris association and LDB age determination
• BANYAN. XII. New Members of Nearby Young Associations from Gaia-Tycho Data
• ACRONYM III: Radial Velocities for 336 Candidate Young Low-Mass Stars in the Solar Neighborhood, Including 78 Newly Confirmed Young Moving Group Members
• SPOTS: The Search for Planets Orbiting Two Stars: II. First constraints on the frequency of sub-stellar companions on wide circumbinary orbits
• Search for associations containing young stars (SACY) VII. New stellar and substellar candidate members in the young associations
• Reaching the boundary between stellar kinematic groups and very wide binaries. III. Sixteen new stars and eight new wide systems in the beta Pictoris moving group
• Search for associations containing young stars (SACY) VIII. An updated census of spectroscopic binary systems showing hints of non-universal multiplicity among these associations
• WISE J080822.18-644357.3 - a 45 Myr-old accreting M dwarf hosting a primordial disc
• BANYAN. VI. Discovery of a companion at the brown dwarf/planet-mass limit to a Tucana-Horologium M dwarf
• The beta Pictoris association: Catalog of photometric rotational periods of low-mass members and candidate members
• A $75\%$ Occurrence Rate of Debris Discs around F stars in the $\beta$ Pic Moving Group
• Addressing Systematics in the Traceback Age of the $\beta$ Pictoris Moving Group
• New debris disks in nearby young moving groups
• Chronostar: a novel Bayesian method for kinematic age determination. I. Derivation and application to the β Pictoris Moving Group
• SPYGLASS. III. The Fornax-Horologium Association and its Traceback History within the Austral Complex
• The Age of the Carina Young Association and Potential Membership of HD 95086
• The Atacama Cosmology Telescope: Detection of mm-wave transient sources
• The Multiplicity of M-Dwarfs in Young Moving Groups
• New binaries from the SHINE survey
• Bayesian assessment of moving group membership: importance of models and prior knowledge
• WEIRD: Wide-orbit Exoplanet search with InfraRed Direct imaging
• Dynamical Mass of the Young Brown Dwarf Companion PZ Tel B
• Development of models for nearby young stellar moving groups: creation, revision, and finalisation of the models
• The young binary HD 102077: Orbit, spectral type, kinematics, and moving group membership
• Kinematic identification of young nearby moving groups from a sample of chromospherically active stars in the RAVE catalog