[en] We present new high-contrast images in near-infrared wavelengths (λ<SUB>c</SUB> = 1.04, 1.24, 1.62, 2.18, and 3.78 μm) of the young variable star CQ Tau, aiming to constrain the presence of companions in the protoplanetary disc. We reached a Ks-band contrast of 14 mag with SPHERE/IRDIS at separations greater than 0${_{.}^{\prime\prime}}$4 from the star. Our mass sensitivity curve rules out giant planets above 4 M<SUB>Jup</SUB> immediately outside the spiral arms at ~60 au and above 2-3 M<SUB>Jup</SUB> beyond 100 au to 5σ confidence assuming hot-start models. We do, however, detect four spiral arms, a double-arc and evidence for shadows in scattered light cast by a misaligned inner disc. Our observations may be explained by an unseen close-in companion on an inclined and eccentric orbit. Such a hypothesis would also account for the disc CO cavity and disturbed kinematics.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hammond, Iain; Monash University, School of Astrophysics
Christiaens, Valentin ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Price, Daniel J.; Monash University, School of Astrophysics
Ubeira-Gabellini, Maria Giulia; University of Milan, Department of Physics
Baird, Jennifer; Monash University, School of Astrophysics
Calcino, Josh; Los Alamos National Laboratory, Theoretical Division
Benisty, Myriam; Institute de Planetologie et d'Astrophysique de Grenoble, University of Chile, Department of Astronomy
Lodato, Giuseppe; University of Milan, Department of Physics
Testi, Leonardo; European Southern Observatory, Germany, Astronomical Observatory of Arcetri
Pinte, Christophe; Monash University, School of Astrophysics, Institute de Planetologie et d'Astrophysique de Grenoble
Toci, Claudia; University of Milan, Department of Physics
Fedele, Davide; Astronomical Observatory of Arcetri, Astronomical Observatory of Turin
Language :
English
Title :
External or internal companion exciting the spiral arms in CQ Tau?
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