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    Discovery of Seven Companions To Intermediate-Mass Stars With Extreme Mass Ratios in the Scorpius-Centaurus Association

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    2015_06_Hinkley.pdf (185.2Kb)
    Date
    2015-06
    Author
    Hinkley, S.
    Kraus, Adam L.
    Ireland, Michael J.
    Cheetham, Anthony
    Carpenter, John M.
    Tuthill, Peter
    Lacour, Sylvestre
    Evans, Thomas M.
    Haubois, Xaubois
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    Abstract
    We report the detection of seven low-mass companions to intermediate-mass stars (SpT B/A/F; M similar to 1.5-4.5M(circle dot)) in the Scorpius-Centaurus (Sco-Cen) Association using nonredundant aperture masking interferometry. Our newly detected objects have contrasts Delta L' approximate to 4-6, corresponding to masses as low as similar to 20 M-Jup and mass ratios of q approximate to 0.01-0.08, depending on the assumed age of the target stars. With projected separations rho approximate to 10-30 AU, our aperture masking detections sample an orbital region previously unprobed by conventional adaptive optics imaging of intermediate-mass Sco-Cen stars covering much larger orbital radii (similar to 30-3000 AU). At such orbital separations, these objects resemble higher-mass versions of the directly imaged planetary mass companions to the 10-30 Myr, intermediate-mass stars HR 8799, beta Pictoris, and HD 95086. These newly discovered companions span the brown dwarf desert, and their masses and orbital radii provide a new constraint on models of the Formation of low-mass stellar and substellar companions to intermediate-mass stars.
    Department
    Astronomy
    Subject
    instrumentation: adaptive optics
    instrumentation: interferometers
    planets and satellites: detection
    techniques: high angular resolution
    primordial binary population
    brown dwarf desert
    ob association
    evolutionary models
    hr 8799
    young
    planets
    stellar
    metallicity
    members
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/43080
    Citation
    Hinkley, Sasha, Adam L. Kraus, Michael J. Ireland, Anthony Cheetham, John M. Carpenter, Peter Tuthill, Sylvestre Lacour, Thomas M. Evans, and Xavier Haubois. "Discovery of Seven Companions to Intermediate Mass Stars with Extreme Mass Ratios in the Scorpius-Centaurus Association." arXiv preprint arXiv:1505.03858 (Jun., 2015).
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