Explanipedia

ESA Voyage 2050 White Paper: Detecting life outside our solar system with a large high-contrast-imaging mission Open

I. A. G. Snellen, Simon Albrecht, G. Anglada‐Escudé, I. Baraffe, Pierre Baudoz , et al. · 2021

In this white paper, we recommend the European Space Agency plays a proactive role in developing a global collaborative effort to construct a large high-contrast imaging space telescope, e.g. as currently under study by NASA. Such a missio…

A MUSE view of the asymmetric jet from HD 163296 Open

Chen Xie, Sebastiaan Y. Haffert, J. de Boer, Matthew A. Kenworthy, J. Brinchmann , et al. · 2021

\nContext. Jets and outflows are thought to play important roles in regulating star formation and disk evolution. An important question is how the jets are launched. HD 163296 is a well-studied Herbig Ae star that hosts proto-planet candid…

Reading between the lines": Magnetospheric accretion, winds, and the inner disk Open

A. Sicilia‐Aguilar, J. Campbell-White, J. Bouvier, V. Roccatagliata, Soko Matsumura , et al. · 2021

What happens in the innermost disk at the time of planet formation? While direct mapping cannot access these regions, emission (and absorption) lines in young stars trace their winds, accretion-related structures, spots, and innermost disk…

Possible single-armed spiral in the protoplanetary disk around HD 34282 Open

J. de Boer, C. Ginski, G. Chauvin, F. Ménard, M. Benisty , et al. · 2021

Context. During the evolution of protoplanetary disks into planetary systems we expect to detect signatures that trace mechanisms such as planet–disk interaction. Protoplanetary disks display a large variety of structures in recently publi…

PDS70, witnessing a young solar system analog in formation with SPHERE/ALMA Open

G. Chauvin, M. Keppler, André Müller, J. de Boer, Sebastian Haffert , et al. · 2021

PDS 70 is a young (5 Myr) star hosting a known transition disk with a large gap resolved by (sub-)millimeter observations with SMA and ALMA. Recent SPHERE XAO high-contrast images revealed the presence of a massive (7 MJup) giant exoplanet…

A Search for Polarized Thermal Emission from Directly Imaged Exoplanets and Brown Dwarf Companions to Nearby Stars Open

Rebecca Jensen-Clem, Maxwell A. Millar‐Blanchaer, R. G. van Holstein, Dimitri Mawet, James Graham , et al. · 2020

Aerosols in the atmospheres of cloudy gas giant exoplanets and brown dwarfs scatter and polarize these objects’ thermal emission. If such an object has an oblate shape or nonuniform cloud distribution, the net degree of linear polarization…

Detection of Polarization due to Cloud Bands in the Nearby Luhman 16 Brown Dwarf Binary Open

Maxwell A. Millar‐Blanchaer, J. H. Girard, Theodora Karalidi, Mark S. Marley, R. G. van Holstein , et al. · 2020

Brown dwarfs exhibit patchy or spatially varying banded cloud structures that are inferred through photometric and spectroscopic variability modeling techniques. However, these methods are insensitive to rotationally invariant structures, …

The Peculiar Morphology of the Gas-rich Circumstellar Disk Wray 15-788 Open

Schuyler Wolff, A. J. Bohn, C. Ginski, J. de Boer, Matthew A. Kenworthy , et al. · 2020

Polarimetric imaging mode of VLT/SPHERE/IRDIS Open

J. de Boer, M. Langlois, R. G. van Holstein, J. H. Girard, D. Mouillet , et al. · 2019

Context. Polarimetric imaging is one of the most effective techniques for high-contrast imaging and for the characterization of protoplanetary disks, and it has the potential of becoming instrumental in the characterization of exoplanets. …

Discovery of a directly imaged disk in scattered light around the Sco-Cen member Wray 15-788 Open

A. J. Bohn, Matthew A. Kenworthy, C. Ginski, M. Benisty, J. de Boer , et al. · 2019

Context. Protoplanetary disks are the birth environments of planetary systems. Therefore, the study of young, circumstellar environments is essential in understanding the processes taking place in planet formation and the evolution of plan…

Searching for H<sub><i>α</i></sub> emitting sources around MWC 758 Open

N. Huélamo, G. Chauvin, H. M. Schmid, S. P. Quanz, E. T. Whelan , et al. · 2018

Context. MWC 758 is a young star surrounded by a transitional disk. The disk shows an inner cavity and spiral arms that could be caused by the presence of protoplanets. Recently, a protoplanet candidate has been detected around MWC 758 thr…

Searching for H$_α$ emitting sources around MWC758: SPHERE/ZIMPOL high-contrast imaging Open

N. Huélamo, G. Chauvin, H. M. Schmid, Sascha P. Quanz, E. T. Whelan , et al. · 2018

MWC758 is a young star surrounded by a transitional disk. Recently, a protoplanet candidate has been detected around MWC758 through high-resolution $L'$-band observations. The candidate is located inside the disk cavity at a separation of …

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

A. Pohl, M. Benisty, Paola Pinilla, C. Ginski, J. de Boer , et al. · 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 μ m) polarized intensity imaging of HD 169142 with VLT/SPHERE. We observe polarized sc…

Polarimetric Imaging Of Protoplanetary Disks From The Optical To Sub-Mm Open

J. de Boer, F. Ménard, C. Pinte, G. van der Plas, F. Snik · 2017

To learn how planets form from the smallest building blocks within protoplanetary disks, we first need to know how dust grains grow from micron to mm sizes. Polarimetry across the spectrum has proven to be sensitive to grain properties lik…

Three years of SPHERE: the latest view of the morphology and evolution of protoplanetary discs Open

A. Garufi, M. Benisty, T. Stolker, H. Avenhaus, J. de Boer , et al. · 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…

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

H. Avenhaus, Sascha P. Quanz, H. M. Schmid, C. Dominik, T. Stolker , et al. · 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 …

Near-infrared scattered light properties of the HR 4796 A dust ring. A measured scattering phase function from 13.6° to 166.6° Open

J. Milli, A. Vigan, D. Mouillet, A. M. Lagrange, J.‐C. Augereau , et al. · 2017

$\textit{Context}$. HR 4796 A is surrounded by a debris disc, observed in scattered light as an inclined ring with a high surface brightness. Past observations have raised several questions. First, a strong brightness asymmetry detected in…

Near-infrared scattered light properties of the HR4796A dust ring: a measured scattering phase function from 13.6deg to 166.6deg Open

J. Milli, A. Vigan, David Mouillet, Anne-Marie Lagrange, J.‐C. Augereau , et al. · 2017

HR4796A is surrounded by a debris disc, observed in scattered light as an inclined ring. Past observations raised several questions. First, a strong brightness asymmetry detected in polarized reflected light recently challenged our underst…

Nonazimuthal linear polarization in protoplanetary disks Open

H. Cánovas, F. Ménard, J. de Boer, C. Pinte, H. Avenhaus , et al. · 2015

\n Several studies discussing imaging polarimetry observations of protoplanetary disks use the so-called radial Stokes parameters Qφ and Uφ to discuss the results. This approach has the advantage of providing a direct measure of the noise …

The inner environment of Z Canis Majoris: High-contrast imaging polarimetry with NaCo Open

H. Cánovas, Sebastián Pérez, C. Dougados, J. de Boer, F. Ménard , et al. · 2015

\n Context. Z CMa is a binary composed of an embedded Herbig Be and an FU Ori class star separated by ~100 au. Observational evidence indicates a complex environment in which each star has a circumstellar disk and drives a jet, and the who…

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