Planet-disk interactions in HD 169142? Tracing ellipticity, structures, and offsets

2018 ◽  
Vol 14 (S345) ◽  
pp. 241-243
Author(s):  
Gesa H.-M. Bertrang ◽  
Henning Avenhaus
Keyword(s):  
Surface Brightness ◽  
Broad Band ◽  
Small Scale ◽  
High Contrast ◽  
Large Telescope ◽  
Very Large Telescope ◽  
Be Star ◽  
Scale Structures ◽  
Differential Imaging ◽  
Small Scale Structures

AbstractIn Bertrang et al. (2018), we present new data of the protoplanetary disk surrounding the Herbig Ae/Be star HD 169142 obtained in the very broad-band (VBB) with the Zurich imaging polarimeter (ZIMPOL), a subsystem of the Spectro-Polarimetric High-contrast Exoplanet REsearch instrument (SPHERE) at the Very Large Telescope (VLT). Our Polarimetric Differential Imaging (PDI) observations probe the disk as close as 0.″3 (3.5au) to the star and are able to trace the disk out to ~1.″08 (~126 au). We find an inner hole, a bright ring bearing substructures around ~0.″18 (21au), and an elliptically shaped gap stretching from 0.″25 to 0.″47 (29–55 au). Outside of 0.″47, the surface brightness drops off, discontinued only by a narrow annular brightness minimum at ~0.″63–0.″74 (74–87 au). These observations confirm features found in less-well resolved data as well as reveal yet undetected indications for planet-disk interactions, such as small-scale structures, star-disk offsets, and potentially moving shadows.

scholarly journals Inventory of Galaxy Properties in Small Scale Structures

2000 ◽  
Vol 174 ◽  
pp. 116-120
Author(s):  
L. Tanvuia ◽  
B. Kelm ◽  
P. Focardi ◽  
R. Rampazzo ◽  
W. W. Zeilinger
Keyword(s):  
Star Formation ◽  
Spectroscopic Study ◽  
Small Groups ◽  
Spectral Properties ◽  
Broad Band ◽  
Small Scale ◽  
Low Density ◽  
Wide Range ◽  
Scale Structures ◽  
Small Scale Structures

AbstractWe report on a broad-band R surface photometric and low resolution spectroscopic study of a set of galaxies located in small groups and pairs of galaxies considered to be in low density environment. Groups span a wide range in density and show different morphological mix. We are analyzing systemic velocities, photometric parameters and spectral properties of the dominant galaxies in the groups. Our aim is to investigate the connection between interaction and induced galaxy activity, from star formation to AGN activity.

Exploring Coronal Structures with SOHO

2000 ◽  
Vol 179 ◽  
pp. 403-406
Author(s):  
M. Karovska ◽  
B. Wood ◽  
J. Chen ◽  
J. Cook ◽  
R. Howard
Keyword(s):  
Solar Corona ◽  
Image Enhancement ◽  
Coronal Mass Ejections ◽  
Dynamical Evolution ◽  
Small Scale ◽  
Low Contrast ◽  
Contrast Structures ◽  
Scale Structures ◽  
Small Scale Structures ◽  
Coronal Structures

AbstractWe applied advanced image enhancement techniques to explore in detail the characteristics of the small-scale structures and/or the low contrast structures in several Coronal Mass Ejections (CMEs) observed by SOHO. We highlight here the results from our studies of the morphology and dynamical evolution of CME structures in the solar corona using two instruments on board SOHO: LASCO and EIT.

scholarly journals Observational aspects of prominence oscillations

2007 ◽  
Vol 3 (S247) ◽  
pp. 152-157 ◽  
Author(s):  
Oddbjørn Engvold
Keyword(s):  
Magnetic Structure ◽  
Numerical Models ◽  
Small Scale ◽  
Solar Prominences ◽  
Scale Structures ◽  
Oscillations And Waves ◽  
Available Information ◽  
Small Scale Structures

AbstractSeismology has become a powerful tool in studies of the magnetic structure of solar prominences and filaments. Reversely, analytical and numerical models are guided by available information about the spatial and thermodynamical structure of these enigmatic structures. The present invited paper reviews recent observational results on oscillations and waves as well as details about small-scale structures and dynamics of prominences and filaments.

scholarly journals Detailed maps of interstellar clouds in front of ω Centauri: small-scale structures in the Galactic disc-halo interface

2009 ◽  
Vol 399 (1) ◽  
pp. 195-208 ◽  
Author(s):  
Jacco Th. van Loon ◽  
Keith T. Smith ◽  
Iain McDonald ◽  
Peter J. Sarre ◽  
Stephen J. Fossey ◽  
...  
Keyword(s):  
Small Scale ◽  
Galactic Disc ◽  
Interstellar Clouds ◽  
Scale Structures ◽  
Small Scale Structures

scholarly journals Stationary magnetospheric convection on November 24, 1981. 2. Small-scale structures in the dayside cusp/cleft

1999 ◽  
Vol 17 (3) ◽  
pp. 375 ◽  
Author(s):  
Y. I. Galperin ◽  
J. M. Bosqued ◽  
R. A. Kovrazhkin ◽  
A. G. Yahnin
Keyword(s):  
Small Scale ◽  
Magnetospheric Convection ◽  
Scale Structures ◽  
Small Scale Structures

scholarly journals GAMMA RAYS FROM SMALL SCALE STRUCTURES ON LONG COSMIC STRINGS

1993 ◽  
Vol 02 (02) ◽  
pp. 183-195 ◽  
Author(s):  
M. MOHAZZAB ◽  
R. BRANDENBERGER
Keyword(s):  
Gamma Rays ◽  
Gamma Ray ◽  
Cosmic Strings ◽  
Unit Length ◽  
Formation Rate ◽  
Long Strings ◽  
Small Scale ◽  
Scale Structures ◽  
Cusp Formation ◽  
Small Scale Structures

The formation of cusps on long cosmic strings is discussed and the probability of cusp formation is estimated. The energy distribution of the gamma-ray background due to cusp annihilation on long strings is calculated and compared to observations. Under optimistic assumptions about the cusp formation rate, we find that strings with a mass per unit length μ less than Gμ=10−14 will have an observable effect. However, it is shown that the gamma-ray bursters cannot be attributed to long ordinary strings (or loops).

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