scholarly journals Condensation Front Migration in a Protoplanetary Nebula

2005 ◽  
Vol 620 (2) ◽  
pp. 994-1001 ◽  
Author(s):  
Sanford S. Davis
Keyword(s):  
Protoplanetary Nebula ◽  
Condensation Front

Surface Laser Plasma in Laser Treatment of Materials in High Pressure Gases

1991 ◽  
Vol 236 ◽  
Author(s):  
A. Smirnov ◽  
C. Dupuy ◽  
G. Flamant
Keyword(s):  
High Pressure ◽  
Laser Treatment ◽  
Laser Plasma ◽  
Holographic Interferometry ◽  
Aerosol Particles ◽  
Optical Breakdown ◽  
Plasma Generation ◽  
Additional Information ◽  
Surface Laser ◽  
Condensation Front

AbstractUsing holographic interferometry the surface laser plasma generation in high pressure gases has been investigated. Additional information about the generation of surface cover laser plasma, optical breakdown in the presence of aerosol particles and condensation front forming in high pressure gases is given.

Particle-Gas Dynamics in the Midplane of a Protoplanetary Nebula

Icarus ◽  
1993 ◽  
Vol 106 (1) ◽  
pp. 102-134 ◽  
Author(s):  
Jeffrey N. Cuzzi ◽  
Anthony R. Dobrovolskis ◽  
Joelle M. Champney
Keyword(s):  
Gas Dynamics ◽  
Protoplanetary Nebula

How Unique is the Protoplanetary Nebula Star HR 4049?

1987 ◽  
pp. 509-510
Author(s):  
C. L. Waelkens ◽  
L. B. F. M. Waters
Keyword(s):  
Protoplanetary Nebula

scholarly journals UV Monochromatic Imaging of the Protoplanetary Nebula Hen 3-1475 Using HST STIS

Galaxies ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 141
Author(s):  
Xuan Fang ◽  
Martín Guerrero ◽  
Ana Castro ◽  
Jesús Toalá ◽  
Bruce Balick ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Critical Role ◽  
Planetary Nebulae ◽  
Emission Lines ◽  
Comparison Analysis ◽  
Space Telescope ◽  
Monochromatic Imaging ◽  
Protoplanetary Nebula ◽  
Low Dispersion ◽  
Negative Gradient

Collimated outflows and jets play a critical role in shaping planetary nebulae (PNe), especially in the brief transition from a spherical AGB envelope to an aspherical PN, which is called the protoplanetary nebula (pPN) phase. We present UV observations of Hen 3-1475, a bipolar pPN with fast, highly collimated jets, obtained with STIS on board the Hubble Space Telescope (HST). The deep, low-dispersion spectroscopy enabled monochromatic imaging of Hen 3-1475 in different UV nebular emission lines; this is the first of such attempt ever conducted for a pPN. The northwest inner knot (NW1) is resolved into four components in Mg ii λ 2800. Through comparison analysis with the HST optical narrowband images obtained 6 yr earlier, we found that these components of NW1 hardly move, despite of a negative gradient of high radial velocities, from −1550 km s - 1 on the innermost component to ∼−300 km s - 1 on the outermost. These NW1 knot components might thus be quasi-stationary shocks near the tip of the conical outflow of Hen 3-1475.

scholarly journals GJ 1214b and the prospects for liquid water on super Earths

2010 ◽  
Vol 6 (S276) ◽  
pp. 189-192
Author(s):  
Leslie A. Rogers ◽  
Sara Seager
Keyword(s):  
Liquid Water ◽  
Equilibrium Temperature ◽  
Average Density ◽  
Outer Envelope ◽  
Water Ice ◽  
Transiting Planets ◽  
Protoplanetary Nebula ◽  
Pass Through ◽  
Gas Layer ◽  
Gas Component

AbstractGJ 1214b is one of the first discovered transiting planets having mass (6.55 M⊕) and radius (2.678 R⊕) smaller than Neptune. To account for its low average density (1870 kg m−3), GJ 1214b must have a significant gas component. We use interior structure models to constrain GJ 1214b's gas envelope mass, and to explore the conditions needed to achieve within the planet pressures and temperatures conducive to liquid water. We consider three possible origins for the gas layer: direct accretion of gas from the protoplanetary nebula, sublimation of ices, and outgassing from rocky material. Despite having an equilibrium temperature below 647 K (the critical temperature of water) GJ 1214b does not have liquid water under most conditions we consider. Even if the outer envelope is predominantly sublimated water ice, in our model a low intrinsic planet luminosity (less than 2 TW) is needed for the water envelope to pass through the liquid phase; at higher interior luminosities the outer envelope transitions from a vapor to a super-fluid then to a plasma at successively greater depths.

scholarly journals 10- m imaging of the bipolar protoplanetary nebula Mz-3

1996 ◽  
Vol 283 (4) ◽  
pp. 1379-1382 ◽  
Author(s):  
D. E. Quinn ◽  
T. J. T. Moore ◽  
R. G. Smith ◽  
C. H. Smith ◽  
T. Fujiyoshi
Keyword(s):  
Protoplanetary Nebula

A Simplified Model for an Evolving Protoplanetary Nebula

2003 ◽  
Vol 592 (2) ◽  
pp. 1193-1200 ◽  
Author(s):  
Sanford S. Davis
Keyword(s):  
Simplified Model ◽  
Protoplanetary Nebula
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