External or internal companion exciting the spiral arms in CQ Tau?
| Autor: | Hammond, Iain, Christiaens, Valentin, Price, Daniel J., Ubeira-Gabellini, Maria Giulia, Baird, Jennifer, Calcino, Josh, Benisty, Myriam, Lodato, Giuseppe, Testi, Leonardo, Pinte, Christophe, Toci, Claudia, Fedele, Davide |
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| Rok vydání: | 2022 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stac2119 |
| Popis: | We present new high-contrast images in near-infrared wavelengths ($\lambda$ = 1.04, 1.24, 1.62, 2.18 and 3.78$\mu$m) 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 magnitudes with SPHERE/IRDIS at separations greater than 0."4 from the star. Our mass sensitivity curve rules out giant planets above 4 M$_{\rm Jup}$ immediately outside the spiral arms at $\sim$60 au and above 2-3 M$_{\rm Jup}$ beyond 100 au to 5$\sigma$ 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. Comment: 10 figures, 14 pages. Accepted for publication in MNRAS on 25 July 2022 |
| Databáze: | arXiv |
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