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Discovery of seven companions to intermediate-mass stars with extreme mass ratios in the Scorpius-Centaurus association

Hinkley, Sasha; Kraus, A L; Cheetham, Anthony; Carpenter, J M; Tuthill, Peter G; Lacour, Sylvestre; Evans, Thomas M; Haubois, X; Ireland, Michael

Description

We report the detection of seven low-mass companions to intermediate-mass stars (SpT B/A/F; 1.5-4.5 M<inf>o</inf>) in the Scorpius-Centaurus (Sco-Cen) Association using nonredundant aperture masking interferometry. Our newly detected objects have contrasts 4-6, corresponding to masses as low as ∼20 M<inf>Jup</inf> and mass ratios of 0.01-0.08, depending on the assumed age of the target stars. With projected separations ρ ≈ 10-30 AU, our aperture masking detections sample an orbital region...[Show more]

dc.contributor.authorHinkley, Sasha
dc.contributor.authorKraus, A L
dc.contributor.authorCheetham, Anthony
dc.contributor.authorCarpenter, J M
dc.contributor.authorTuthill, Peter G
dc.contributor.authorLacour, Sylvestre
dc.contributor.authorEvans, Thomas M
dc.contributor.authorHaubois, X
dc.contributor.authorIreland, Michael
dc.date.accessioned2016-06-14T23:20:07Z
dc.identifier.issn2041-8205
dc.identifier.urihttp://hdl.handle.net/1885/103215
dc.description.abstractWe report the detection of seven low-mass companions to intermediate-mass stars (SpT B/A/F; 1.5-4.5 M<inf>o</inf>) in the Scorpius-Centaurus (Sco-Cen) Association using nonredundant aperture masking interferometry. Our newly detected objects have contrasts 4-6, corresponding to masses as low as ∼20 M<inf>Jup</inf> and mass ratios of 0.01-0.08, depending on the assumed age of the target stars. With projected separations ρ ≈ 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 (∼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, β 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.
dc.publisherInstitute of Physics Publishing Ltd.
dc.rightsAuthor/s retain copyright
dc.sourceAstrophysical Journal Letters
dc.titleDiscovery of seven companions to intermediate-mass stars with extreme mass ratios in the Scorpius-Centaurus association
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume806
dc.date.issued2015
local.identifier.absfor020102 - Astronomical and Space Instrumentation
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationU3488905xPUB5654
local.type.statusPublished Version
local.contributor.affiliationHinkley, Sasha, University of Exeter
local.contributor.affiliationKraus, A L, The University of Texas
local.contributor.affiliationIreland, Michael, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationCheetham, Anthony, University of Sydney
local.contributor.affiliationCarpenter, J M, California Institute of Technology
local.contributor.affiliationTuthill, Peter G, University of Sydney
local.contributor.affiliationLacour, Sylvestre, Observatoire de Paris
local.contributor.affiliationEvans, Thomas M, University of Exeter
local.contributor.affiliationHaubois, X, University of Sydney
local.bibliographicCitation.issue1
local.identifier.doi10.1088/2041-8205/806/1/L9
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2016-06-14T08:45:52Z
local.identifier.scopusID2-s2.0-84930938110
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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