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Hinkley Sasha, Kraus Adam, Ireland Michael J., Cheetham Anthony C., Carpenter John M., Tuthill Peter G., Lacour Sylvestre, Evans Thomas M., Haubois Xavier

Discovery of Seven Companions to Intermediate-mass Stars with Extreme Mass Ratios in the Scorpius-Centaurus Association

The Astrophysical Journal Letters, 2015, vol. 806

Référence ADS : 2015ApJ...806L...9H

Résumé :

We report the detection of seven low-mass companions to intermediate-mass stars (SpT B/A/F; M ~ 1.5--4.5 M<SUB>&sun;</SUB>) in the Scorpius--Centaurus (Sco--Cen) Association using nonredundant aperture masking interferometry. Our newly detected objects have contrasts {Delta }L<SUP>\prime</SUP> &ap; 4--6, corresponding to masses as low as ~20 M<SUB>Jup</SUB> and mass ratios of q &ap; 0.01--0.08, depending on the assumed age of the target stars. With projected separations rho &ap; 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, 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.

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