• Thumbnail for Protoplanetary disk
    A protoplanetary disk is a rotating circumstellar disc of dense gas and dust surrounding a young newly formed star, a T Tauri star, or Herbig Ae/Be star...
    22 KB (2,205 words) - 00:37, 29 April 2025
  • Thumbnail for HH 30
    HH 30 (category Circumstellar disks)
    V1213 Tauri) is an edge-on protoplanetary disk located about 146.4 parsecs from Earth that is surrounded by jets and a disk wind. HH-30 is located in the...
    15 KB (1,496 words) - 14:10, 8 April 2025
  • Thumbnail for Primary atmosphere
    a protoplanet that forms by accretion of gaseous matter from the protoplanetary disk. Gas giant planets including Jupiter, Saturn, have primary atmospheres...
    8 KB (879 words) - 18:13, 11 April 2025
  • Thumbnail for Nebular hypothesis
    Nebular hypothesis (category Circumstellar disks)
    with the protoplanetary disk evolving into a planetary system over the next 10–100 million years. The protoplanetary disk is an accretion disk that feeds...
    75 KB (9,180 words) - 01:06, 29 December 2024
  • Thumbnail for TW Hydrae
    TW Hydrae (category Circumstellar disks)
    5-10 million years old. The star appears to be accreting from a protoplanetary disk of dust and gas, oriented face-on to Earth, which has been resolved...
    17 KB (1,569 words) - 20:55, 15 December 2024
  • Thumbnail for Planetary migration
    days). The generally accepted theory of planet formation from a protoplanetary disk predicts that such planets cannot form so close to their stars, as...
    40 KB (5,112 words) - 22:54, 19 December 2024
  • astronomy, a disk wind is a particle outflow observed around accretion disks, mainly near protoplanetary disks and active galactic nulei (AGN). The disk wind...
    15 KB (1,493 words) - 16:12, 19 February 2025
  • Thumbnail for HD 142527
    HD 142527 (category Circumstellar disks)
    protoplanetary disk, which has a mass of 15% of the Sun and a diameter of 980 AU. Studies have shown eddies and vortex structures forming in the disk...
    9 KB (789 words) - 22:05, 28 November 2023
  • Thumbnail for Stellar age estimation
    spectral and luminosity classification system, and the presence of a protoplanetary disk, among others. Nearly all of the methods of determining age require...
    11 KB (1,301 words) - 10:27, 31 March 2025
  • Thumbnail for Ablation
    circumstellar disk around the star. This circumstellar disk may eventually mature into what is referred to as a protoplanetary disk: a disk of gas, dust...
    23 KB (2,946 words) - 02:11, 30 November 2024
  • Thumbnail for HL Tauri
    the rotational axis of the disk that is colliding with nearby interstellar dust and gas. Indications of a protoplanetary disk were first presented in 1975...
    12 KB (1,196 words) - 20:21, 7 May 2025
  • from hot stars acts on clouds of material such as molecular clouds, protoplanetary disks, or planetary atmospheres. One of the most obvious manifestations...
    18 KB (2,204 words) - 21:20, 1 October 2024
  • Thumbnail for Protoplanetary nebula
    sometimes employed when discussing the unrelated concept of protoplanetary disks. The name protoplanetary nebula is a consequence of the older term planetary...
    12 KB (1,285 words) - 13:52, 19 August 2024
  • Thumbnail for HD 163296
    HD 163296 (category Circumstellar disks)
    is a young Herbig Ae star surrounded by a protoplanetary disk. The disk is a popular target to study disk composition, and several works suggested the...
    48 KB (4,837 words) - 19:50, 11 May 2025
  • Thumbnail for Elias 2-27
    Elias 2-27 (category Circumstellar disks)
    Elias 2-27 (2MASS J16264502-2423077) is a YSO star with a protoplanetary disk around it, located in the Ophiuchus Molecular Cloud (ρ Oph Cld, 5 Oph Cld...
    7 KB (481 words) - 02:46, 22 June 2024
  • Thumbnail for Pebble accretion
    diameter, into planetesimals in a protoplanetary disk that is enhanced by aerodynamic drag from the gas present in the disk. This drag reduces the relative...
    22 KB (2,871 words) - 03:35, 27 March 2025
  • Thumbnail for PDS 70
    76 M☉ and is approximately 5.4 million years old. The star has a protoplanetary disk containing two nascent exoplanets, named PDS 70b and PDS 70c, which...
    32 KB (3,111 words) - 19:49, 11 May 2025
  • Thumbnail for Proplyd
    A proplyd, short for ionized protoplanetary disk, is an externally illuminated photoevaporating protoplanetary disk around a young star. Nearly 180 proplyds...
    29 KB (2,828 words) - 17:54, 15 March 2025
  • Thumbnail for Protostar
    protostar, and then a protoplanetary disk orbiting the object. As the collapse continues, an increasing amount of gas impacts the disk rather than the star...
    10 KB (1,217 words) - 10:54, 5 April 2025
  • Thumbnail for Flying Saucer (protoplanetary disk)
    J16281370-2431391) is a protoplanetary disk in the Rho Ophiuchi cloud complex. The 2MASS source J16281370-2431391 was identified as resolved circumstellar disk with the...
    13 KB (1,201 words) - 19:11, 19 May 2025
  • Thumbnail for GW Orionis
    GW Orionis (category Circumstellar disks)
    Lambda Orionis star-forming region and has an extended circumtrinary protoplanetary disk. GW Orionis first came to the attention of astronomers when it was...
    15 KB (1,004 words) - 03:52, 25 April 2025
  • Thumbnail for 2MASS J04202144+2813491
    2MASS J04202144+2813491 (category Circumstellar disks)
    as Tau 042021) is an edge-on protoplanetary disk in the Taurus Molecular Cloud. The star is hidden behind the edge-on disk. Early estimates found that...
    15 KB (1,466 words) - 06:46, 6 February 2025
  • Thumbnail for Accretion (astrophysics)
    instability the interaction between the solids and the gas in the protoplanetary disk results in the growth of local concentrations, as new particles accumulate...
    40 KB (4,404 words) - 21:29, 15 March 2025
  • Thumbnail for Formation and evolution of the Solar System
    in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar...
    113 KB (13,512 words) - 19:49, 17 May 2025
  • Thumbnail for Planet
    of a nebula to create a young protostar orbited by a protoplanetary disk. Planets grow in this disk by the gradual accumulation of material driven by gravity...
    199 KB (20,934 words) - 17:02, 8 May 2025
  • Thumbnail for Circumstellar disc
    the inner radius. Protoplanetary disks and debris disks can be imaged with different methods. If the disk is seen edge-on, the disk can sometimes block...
    29 KB (3,599 words) - 15:49, 9 May 2025
  • Thumbnail for Circumplanetary disk
    M.; Espaillat, Catherine C. (1 November 2021). "Disk Masses and Dust Evolution of Protoplanetary Disks around Brown Dwarfs". The Astrophysical Journal...
    29 KB (3,360 words) - 22:56, 25 April 2025
  • Thumbnail for IM Lupi
    IM Lupi (category Circumstellar disks)
    IM Lupi is a young stellar object with a surrounding protoplanetary disk. The young star is suspected to host a still forming protoplanet at a distance...
    7 KB (654 words) - 05:25, 19 November 2024
  • Thumbnail for Protoplanet
    protoplanet is a large planetary embryo that originated within a protoplanetary disk and has undergone internal melting to produce a differentiated interior...
    28 KB (2,666 words) - 03:00, 1 May 2025
  • Thumbnail for HD 141569
    HD 141569 (category Circumstellar disks)
    a protoplanetary disk was discovered around the star. A gap in the disk led to speculation about a possible extrasolar planet forming in the disk. In...
    12 KB (1,051 words) - 17:33, 4 September 2024