THE VEGA DEBRIS DISK: A SURPRISE FROM SPITZER
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1 THE VEGA DEBRIS DISK: A SURPRISE FROM SPITZER
2 Vega Properties 25.3 Light away in the constellation Lyra Mass 2.6 M, Radius 3.1 R Luminosity 51 L Metallicity 63% Vega is the brightest star in the Lyra, and the fifth brightest star in the sky. It is the second brightest star in the Northern night sky Apparent magnitude (V) Absolute magnitude (Mv)0.58
3 Its spectral class is A0V. It is in the main sequence (dwarf) Vega's current age is about ^8 years. Its lifetime is only one billion years (white dwarf) The flux densities are roughly equal to Jy. The flux density of Vega drops rapidly in the infrared, and is near 100 Jy at 5 µm Vega's polar temperature 9,300 ºK, while its equatorial temperature is 7,600 ºK Vega rotates at 93% of the speed that would cause it to start breaking up from centrifugal effects with a rotation period of about 12.5 hours (sun: days)
4 Dust disk & possible planetary system IRAS first discovered infrared radiation excess (1983) A circular shell of dust surrounds the star extending outwards to 140 AU (Sub-) Millimeter-wavelength observations were sensitive to structures as small as 20 AU They managed to resolve two knots in the circumstellar dust that were offset at 60 and 75 AUs from Vega The greatest concentration of dust, is centered on a spot located from the star about twice the distance between Pluto and the Sun in the Solar system
5 Dust disk & possible planetary system If the blob of dust is associated with Vega, it could be a dust cloud around a giant planet orbiting Vega. The modelling of the asymmetric circumstellar disk infalling into Vega suggests that there may be a planet twice the mass of Jupiter at an orbital distance of about 50 to 60 AU from the star in an eccentric orbit The dust would tend to become trapped in the hypothesized planet's mean-motion resonances around Vega
6 Numerical Modeling suggests The semimajor axis of the planet's orbit may center around 30 AU smaller than 30 times Jupiter's mass The faint dust disk around Vega can be best explained by the presence of Neptune-sized and Jupiter-sized planets orbiting at distances Probably, a Neptune-like planet actually formed much closer to Vega and was pushed by a Jupiter-like planet in an inner orbit out to its current wide orbit around 80 AUs away from Vega over about 56 million years, sweeping many comets out with it and causing the dust disk to become clumpy.
7 However Using Spitzer, the dust disk was found bigger than previously estimated. The disk appears to be mostly composed of small dust particles (1-50 µm) that are probably created by the collision of protoplanetary bodies within approximately 90 AU of the star but are then blown away by its intense radiation. On the other hand, the mass and short lifetime of these small particles indicate that the disk detected was created by a large and relatively recent collision that may have involved objects as big as the planet Pluto
8 In this Paper (Su et al.) High spatial resolution mid- and far-infrared images of Vega debris disk with MIPS were used The disk is well resolved, and its angular is much larger than previously found. 330, 543, 815 AU at 24, 70 and 160 µm!!! Circular, Smooth, and without clumpiness at all three wavelength, power law radial surface brightness profile. Radial surface brightness profiles follow radial power laws of r^(-3) or r^(-4) and imply an inner boundary at a radius of 11 ± 2 (86 AU). Surface number density falls like 1/r. Axially symmetric disk of (3.0±1.5)10^-3 Mearth
9 Radial Profile of Vega The Vega disk at 24 m is tenuous compared to the very bright photosphere (7.4 Jy). The existence of a very low surface brightness disk is best illustrated by examining the radial profile Relative to the observed point-spread function (PSF) scaled to Vega s photospheric level, the observed radial profile lies consistently above the scaled point-source profile Vega s photosphere contributes a significant fraction of the flux near the center of our images at both 24 and 70 µm Vega s debris disk dominates most of the flux at 160 µm
10 Disk Morphoogies at 24, 70 & 160 µm The disk at 24 µm is symmetric and centered at the star position, ~32 (330 AU) in radius 1.5 Jy(±10%), in agreement with IRAS 25 µm Similarly in 70 µm, no obvious clumpy structure in the fine-scale image. ~70 (543 AU) in radius. Total flux~7 Jy (±20%) Assuming azimuthal symmetry, at 160 µm, the outermost of the disk ~105 (815 AU), ~4Jy (±20%) The disk is circular at all wavelengths, suggesting a face-on disk SED of the disk can be characterized as a blackbody of T=95K Surprise 1: Submillimeter and millimeter ~11 radius, (Fomalhaut debris disk had an agreement between Submillimeter & IR) Surprise 2: Presence of material warm enough to be detected at large distance
11 The Surface Brightness Radial Distribution Radial profile of Vega at 24 µm, Best fit-power law index is -4.1±0.1 Radial profile of Vega at 70 µm, Best fit-power law index is -3. 8±0.1 Conclusion:the disk surface brightness distribution follows simple power-law dependencies, implying that the disk density structure is simple and smooth.
12 Radial Profile for 24 &70 µm for different power law profile models
13 Radial Profile for 160 µm
14 So, A radial-dependent power law with index of -3 (inner part) or -4 (outer part) The radial power law dependence can t apply all the way to the star, a hole or a flat distribution is required The hole: a region lacking material that emits strongly at 24,70 and 160 µm The radius of the hole is ~11 ±2 about the same size as the 850 µm ring. So Maybe, the MIPS bands originate from the submillimeter ring where collisions generate small debris blown away by radiation.
15 Disk Structure and Mass
16
17 Disk Structure and Mass A range of models using amorphous silicate and/or carbon grains of sizes from ~1 to 50 µm can fit the infrared radiometric behavior of the disk out to ~800 AU Grain size limits depend on the adopted grain composition. All these models require an 1/r surface number density and a total mass of (3.0±1.5) 10^-3 Mearth in grain. Models that fit the submillimeter data additionaly require an inner ring (~100 AU) with larger grains(>180 µm ) and a total mass > 10^-3 Mearth
18 Origin of the Debris One possibility: The dust seen at AU is produced from a highly extended Kuiper Belt around Vega. This gives a 100 Mearth kuiper belt!, and non smoothness Another possibility is interstellar medium. Radial symmetry strongly suggest that the star itself is the source of the dust NOT interstellar medium From Comet? Large extent and the radial and azimuthal distributions of Vega s disk are all consistent with a model in which dust at ~100 AU is blown away by radiation pressure Grain sizes (~1-50µm) deduced from this model are consistent with being pushed out by radiation pressure: small grains are ejected (at a time small of one orbital period ~1000 year), large grains spiral in under the influence of Poynting-Robertson drag. Innner ring seen at submillimeter (86-200AU) imply very long residence Taking the dust mass in small grains to be ~3.0 10^-3 Mearth and ~1000 year residence, the required dust production rate is ~6 10^14 g/s (~2 10^8 for Hale-Bopp comet). So, the source is not Comet! Also, the disk can t be originated when Vega was born (0.3-3 Msolar of the disk is large) This suggest the disk is ephemeral! They favor a scenario of collisional cascade subsequent to a large disruptive collision of pluto size planets!
19 References THE VEGA DEBRIS DISK: A SURPRISE FROM SPITZER. The Astrophysical Journal, 628: , 2005 April 4 Vega is a rapidly rotating star, D.M. Peterson,arXiv:astroph/ v1 20 Mar 2006
Alexander Krivov, Sebastian Müller, Torsten Löhne, Harald Mutschke
From observations of debris dust to properties of planetesimals Alexander Krivov, Sebastian Müller, Torsten Löhne, Harald Mutschke Astrophysical Institute and University Observatory Friedrich Schiller
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