Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.mrao.cam.ac.uk/wp-content/uploads/2014/04/MDeJuanOvelar.pdf Дата изменения: Wed Apr 16 17:16:51 2014 Дата индексирования: Sun Apr 10 13:31:01 2016 Кодировка: Поисковые слова: asteroid

Combining SPHERE and ALMA to reveal the properties of planets in transitional discs

Maria de Juan Ovelar M. Min, C. Dominik, C. Thalmann, P. Pinilla, M. Benisty and T. Birnstiel
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April 2014

Exoplanet uk community meeting


Introduction
Transitional discs!

Localised depletion of material in the disc. Depletion mechanisms:! 1. Grain growth (e.g. Dullemond & Dominik 2005, Birnstiel et al. 2012)! 2. Photoevaporation (e.g. Alexander & Armitage 2007, Owen & Clarke 2012, Clarke & Owen 2013,
Rosotti et al. 2013)!

3. Interaction with one or more (forming) planets (e.g. Rice et al. 2003, Ireland & Kraus 2008)!
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Introduction
Depletion detected through!
· · SED! Imaging: ! interferometry (IR/submm/mm...)! infrared !

Credit: T. Birnstiel!

TW Hydrae! Andrews et al. 2011!
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Credit: Hubble! NICMOS!


Introduction
The "missing" cavities
H-band PI (1.6 µm)! Small grains (~ µm)! (e.g. Follette et al. 2013)!

Andrews et al. 2011!

880 µm! Big grains (~mm)!

different radial distribution of big and small dust grains!
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sphere + alma
"Dust Traps" (Pinilla et al. 2012b)!

GAS!

DUST!

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dust traps
SPHERE-ZIMPOL (R-band)! HiCIAO (H-band)! ALMA (Band 7)!

Images at different wavelengths show different structures !

R-band: 0.65 m! H-band: 1.6 m! Band 7: 850 m!

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sphere + alma
Large particles are trapped in the bump small particles drift towards inner disc. ! Mass of planet sets the size threshold!
Planet!

Relative position of small and big grains traces the mass of the planet!

de Juan Ovelar et al. 2013!
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sphere + alma
Rp= 20 AU! SPHERE-ZIMPOL Rp= 40 AU! Rp= 60 AU!

images!
ALMA contours!

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sphere + alma
Rp= 20 AU! Rp= 40 AU! Rp= 60 AU!

Ratio between radial position of walls of big and small dust grains! PLANET MASS ESTIMATOR!

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Conclusions
1. The filtering/trapping mechanism triggered by a companion can very well explain the different distributions of dust grains according to their size! 2. Combination of ALMA and SPHERE polarimetric observations at sub-mm and visible wavelengths can tightly constrain mass and separation of "unseen" planet. ! 3. Multi-wavelength imaging is key to understand current observations of transitional discs!

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Thank you!

Cambridge, 15

th

April 2014

Exoplanet uk community meeting