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Protoplanetary Disks

First scattered light detection of a nearly edge-on transition disk around the T Tauri star RY Lup

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Transition disks are considered sites of ongoing planet formation, and their dust and gas distributions could be signposts of embedded planets. The transition disk around the T Tauri star RY Lup has an inner dust cavity and displays a strong silicate emission feature. Using high-resolution imaging we study the disk geometry, including non-axisymmetric features, and its surface dust grain, to (...)

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Dust modeling of the combined ALMA and SPHERE datasets of HD163296. Is HD163296 really a Meeus group II disk ?

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Context. Multi-wavelength observations are indispensable in studying disk geometry and dust evolution processes in protoplanetary disks. Aims. We aimed to construct a 3-dimensional model of HD 163296 capable of reproducing simultaneously new observations of the disk surface in scattered light with the SPHERE instrument and thermal emission continuum observations of the disk midplane with (...)

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Three Years of SPHERE : The Latest View of the Morphology and Evolution of Protoplanetary Discs

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Sep. 2017 : 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 (...)

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The Circumstellar Disk HD 169142 : Gas, Dust, and Planets Acting in Concert ?

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Nov. 2017 : HD 169142 is an excellent target for investigating signs of planet–disk interaction due to previous evidence of gap structures. We perform J-band (∼1.2 μm) polarized intensity imaging of HD 169142 with VLT/SPHERE. We observe polarized scattered light down to 0.″16 (∼19 au) and find an inner gap with a significantly reduced scattered-light flux. We confirm the previously detected (...)

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Exploring Dust around HD 142527 down to 0.″025 (4 au) Using SPHERE/ZIMPOL

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Jul. 2017 : We have observed the protoplanetary disk of the well-known young Herbig star HD 142527 using ZIMPOL polarimetric differential imaging with the very broad band (˜600-900 nm) filter. We obtained two data sets in 2015 May and 2016 March. Our data allow us to explore dust scattering around the star down to a radius of ˜0.″025 (˜4 au). The well-known outer disk is clearly detected at (...)

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New constraints on the disk characteristics and companion candidates around T Chamaeleontis with VLT/SPHERE

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Sep. 2017 : The transition disk around the T Tauri star T Cha possesses a large gap, making it a prime target for high-resolution imaging in the context of planet formation. We aim to find signs of disk evolutionary processes by studying the disk geometry and the dust grain properties at its surface, and to search for companion candidates. We analyze a set of VLT/SPHERE data at (...)

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Three Radial Gaps in the Disk of TW Hydrae Imaged with SPHERE

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Mar. 2017 : We present scattered light images of the TW Hya disk performed with the Spectro-Polarimetric High-contrast Exoplanet REsearch instrument in Polarimetric Differential Imaging mode at 0.63, 0.79, 1.24, and 1.62 μm. We also present H2/H3-band angular differential imaging (ADI) observations. Three distinct radial depressions in the polarized intensity distribution are seen, around ≈85, (...)

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Investigation of the inner structures around HD 169142 with VLT/SPHERE

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Jan. 2018 : We present observations of the Herbig Ae star HD 169142 with the VLT/SPHERE instruments InfraRed Dual-band Imager and Spectrograph (IRDIS) (K1K2 and H2H3 bands) and the Integral Field Spectrograph (IFS) (Y, J and H bands). We detect several bright blobs at ˜180 mas separation from the star, and a faint arc-like structure in the IFS data. Our reference differential imaging (RDI) (...)

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Testing giant planet formation in the transitional disk of SAO 206462 using deep VLT/SPHERE imaging

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May. 2017 : The SAO 206462 (HD 135344B) disk is one of the few known transitional disks showing asymmetric features in scattered light and thermal emission. Near-infrared scattered-light images revealed two bright outer spiral arms and an inner cavity depleted in dust. Giant protoplanets have been proposed to account for the disk morphology. We aim to search for giant planets responsible (...)

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Shadows and spirals in the protoplanetary disk HD 100453

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Jan. 2017 : Understanding the diversity of planets requires to study the morphology and the physical conditions in the protoplanetary disks in which they form. We observed and spatially resolved the disk around the 10 Myr old protoplanetary disk HD 100453 in polarized scattered light with SPHERE/VLT at optical and near-infrared wavelengths, reaching an angular resolution of 0.02", and an (...)

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The SPHERE View of the planet-froming disk around HD100546

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Apr. 2016 : The mechanisms governing planet formation are not fully understood. A new era of high-resolution imaging of protoplanetary disks has recently started, thanks to new instruments such as SPHERE, GPI, and ALMA. The planet formation process can now be directly studied by imaging both planetary companions embedded in disks and their effect on disk (...)

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Shadows cast on the transition disk of HD 135344B

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Nov. 2016 : The protoplanetary disk around the F-type star HD 135344B (SAO 206462) is in a transition stage and shows many intriguing structures both in scattered light and thermal (sub-)millimeter emission which are possibly related to planet formation processes.

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Resolving the planet-hosting inner regions of the LkCa 15 disk

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Sep. 2016 : LkCa 15 hosts a pre-transitional disk as well as at least one accreting protoplanet orbiting in its gap. Previous disk observations have focused mainly on the outer disk, which is cleared inward of 50 au. The planet candidates, on the other hand, reside at orbital radii around 15 au, where disk observations have been unreliable until (...)

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Direct detection of scattered light gaps in the transitional disk around HD 97048 with VLT/SPHERE

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Sep. 2016 : We studied the well known circumstellar disk around the Herbig Ae/Be star HD 97048 with high angular resolution to reveal undetected structures in the disk, which may be indicative of disk evolutionary processes such as planet formation. We used the IRDIS near-IR subsystem of the extreme adaptive optics imager SPHERE at the ESO/VLT to study the scattered light from the (...)

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Multiple rings in the transition disk and companion candidates around RXJ1615.3-3255. High contrast imaging with VLT/SPHERE

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Nov. 2016 : We search for signs of ongoing planet-disk interaction and study the distribution of small grains at the surface of the transition disk around RXJ1615.3-3255 (RX J1615). We observed RXJ1615 with VLT/SPHERE. We image the disk for the first time in scattered light and detect two arcs, two rings, a gap and an inner disk with marginal evidence for an inner (...)

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