Age Dependence of the Vega Phenomenon: Theory

  title={Age Dependence of the Vega Phenomenon: Theory},
  author={Carsten Dominik and Greet Decin},
  journal={The Astrophysical Journal},
  pages={626 - 635}
In a separate paper, we have reexamined the observations of IR excess obtained with the Infrared Space Observatory satellite and discussed the ages of stars with excess. The amount of dust (measured by the luminosity fraction fd = LIR/L*) seen around main-sequence stars of different ages shows several interesting trends. To discuss these results in the context of a physical model, we develop in this paper an analytical model for the dust production in Vega-type systems. Previously it has been… 

Age Dependence of the Vega Phenomenon: Observations

We study the time dependency of Vega-like excesses using infrared studies obtained with the imaging photopolarimeter ISOPHOT on board the Infrared Space Observatory. We review the different studies

The Insignificance of P-R drag in detectable extrasolar planetesimal belts

This paper considers a simple model in which dust produced in a planetesimal belt migrates in toward the star due to P-R drag suffering destructive collisions with other dust grains on the way.


The main-sequence solar-type star HD 69830 has an unusually large amount of dusty debris orbiting close to three planets found via the radial velocity technique. In order to explore the dynamical

The bright end of the exo-Zodi luminosity function: disc evolution and implications for exo-Earth detectability

We present the first characterisation of the 12µm warm dust (‘exo-Zodi’) luminosity function around Sun-like stars, focusing on the dustiest systems that can be identified by the WISE mission. We use


We present nulling interferometric observations of six nearby main-sequence stars (α CrB, α Lyr, β Leo, γ Ser, ϵ Eri, and ζ Lep). None of the stars show evidence for a positive detection of warm

Mid-infrared images of β Pictoris and the possible role of planetesimal collisions in the central disk

Thermal infrared images of the central disk imply that the brightness asymmetry results from the presence of a bright clump composed of particles that may differ in size from dust elsewhere in the disk, which is suggested to result from the collisional grinding of resonantly trapped planetesimals or the cataclysmic break-up of a planetesimal.

Warm dusty discs: exploring the A star 24 μm debris population

Aims. Studies of the debris disc phenomenon have shown that most systems are analogous to the Edgeworth-Kuiper belt (EKB). In this study we aim to determine how many of the IRAS 25 μm excesses

Transience of Hot Dust around Sun-like Stars

In this paper a simple model for the steady state evolution of debris disks due to collisions is developed and confronted with the properties of the emerging population of seven Sun-like stars that

A multiwavelength study of the debris disc around 49 Cet

In a multiwavelength study of thermal emission and scattered light images we analyse the dust properties and structure of the debris disc around the A1-type main-sequence star 49 Cet. As a basis

Studying the Evolution of Warm Dust Encircling BD +20 307 Using SOFIA

The small class of known stars with unusually warm, dusty debris disks is a key sample to probe in order to understand cascade models and the extreme collisions that likely lead to the final



Age Dependence of the Vega Phenomenon: Observations

We study the time dependency of Vega-like excesses using infrared studies obtained with the imaging photopolarimeter ISOPHOT on board the Infrared Space Observatory. We review the different studies

The Disk of β Pictoris in the Light of Polarimetric Data

We model the linear polarization of the radiation of β Pic scattered by dust particles in the circumstellar disk. The observed spatial distribution and the wavelength dependence of the polarization

Submillimeter studies of main-sequence stars

JCMT maps of the 800-micron emission from Vega, Fomalhaut, and Beta Pictoris are interpreted to indicate that they are not ringed by large reservoirs of distant orbiting dust particles that are too

Modeling the Infrared Emission from the HR 4796A Disk

We model the spectral energy distribution (SED) from the mid-infrared to submillimeter of the ringlike disk of HR 4796A, the dustiest A-type star. We consider dust made of either coagulated but

SCUBA observations of dust around Lindroos stars: evidence for a substantial submillimetre disc population

We have observed 22 young stars from the Lindroos sample at 850 μm with SCUBA on the James Clerk Maxwell Telescope to search for evidence of dust discs. Stars in this sample are the less massive

Collisional Cascades in Planetesimal Disks. I. Stellar Flybys

We use a new multiannulus planetesimal accretion code to investigate the evolution of a planetesimal disk following a moderately close encounter with a passing star. The calculations include

A Protocometary Cloud around HR 4796A?

We report both ROSAT observations and ground-based 10.8 μm imaging of the wide binary HR 4796, which consists of a main-sequence A-type star with a large amount of circumstellar dust, HR 4796A, and,

Dusty Debris around Solar-Type Stars: Temporal Disk Evolution

Using ISO-ISOPHOT, we carried out a survey of almost 150 stars to search for evidence of emission from dust orbiting young main-sequence stars, both in clusters and isolated systems. Over half of the

The Role of Dust in the Formation of Stars

I Ground-Based Observations of Young Stellar Objects.- High-Angular Resolution Near-Infrared Observations of the Circumstellar Environment of Young Stellar Objects.- Submillimeter Dust Continuum

Collisional Erosion in the Primordial Edgeworth-Kuiper Belt and the Generation of the 30-50 AU Kuiper Gap

One of the oustanding questions about the architecture of the outer solar system is how the trans-Neptunian disk of comets and small planet-scale objects known as the solar system's Edgeworth-Kuiper