References of "Stolker, Tomas"
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See detailDynamical Evidence of a Spiral Arm-driving Planet in the MWC 758 Protoplanetary Disk
Ren, Bin; Dong, Ruobing; van Holstein, Rob G. et al

in Astrophysical Journal (2020), 898

More than a dozen young stars host spiral arms in their surrounding protoplanetary disks. The excitation mechanisms of such arms are under debate. The two leading hypotheses—companion-disk interaction and ... [more ▼]

More than a dozen young stars host spiral arms in their surrounding protoplanetary disks. The excitation mechanisms of such arms are under debate. The two leading hypotheses—companion-disk interaction and gravitational instability (GI)—predict distinct motion for spirals. By imaging the MWC 758 spiral arm system at two epochs spanning ∼5 yr using the SPHERE instrument on the Very Large Telescope, we test the two hypotheses for the first time. We find that the pattern speeds of the spirals are not consistent with the GI origin. Our measurements further evince the existence of a faint "missing planet" driving the disk arms. The average spiral pattern speed is 0°22 ± 0°03 yr[SUP]-1[/SUP], pointing to a driver at ${172}_{-14}^{+18}$ au around a 1.9 M[SUB]☉[/SUB] central star if it is on a circular orbit. In addition, we witness time-varying shadowing effects on a global scale that are likely originating from an inner disk. [less ▲]

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See detailThree Years of SPHERE: The Latest View of the Morphology and Evolution of Protoplanetary Discs
Garufi, Antonio; Benisty, Myriam; Stolker, Tomas et al

in Messenger (2017), 169

Spatially resolving the immediate surroundings of young stars is a key challenge for the planet formation community. SPHERE on the VLT represents an important step forward by increasing the opportunities ... [more ▼]

Spatially resolving the immediate surroundings of young stars is a key challenge for the planet formation community. SPHERE on the VLT represents an important step forward by increasing the opportunities offered by optical or near-infrared imaging instruments to image protoplanetary discs. The Guaranteed Time Observation Disc team has concentrated much of its efforts on polarimetric differential imaging, a technique that enables the efficient removal of stellar light and thus facilitates the detection of light scattered by the disc within a few au from the central star. These images reveal intriguing complex disc structures and diverse morphological features that are possibly caused by ongoing planet formation in the disc. An overview of the recent advances enabled by SPHERE is presented. <P /> [less ▲]

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See detailTesting giant planet predictions in the transitional disk of SAO206462 using deep VLT/SPHERE imaging
Maire, Anne-Lise ULiege; Stolker, Tomas; Messina, Sergio et al

Conference (2016)

The SAO206462 disk is one of the few known transitional disks showing asymmetric features in scattered light and thermal emission. Giant planets in formation were suggested for accounting for the disk ... [more ▼]

The SAO206462 disk is one of the few known transitional disks showing asymmetric features in scattered light and thermal emission. Giant planets in formation were suggested for accounting for the disk features. We present deep SPHERE images of the disk. The spiral arms and the inner ring are revealed without the need for image post-processing. We also place deep constraints on putative planets. [less ▲]

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