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Print/export Download as PDF; Printable version; In other projects Wikidata item; Appearance. ... First protoplanetary disc around a pulsar discovered 4U 0142+61:
2MASS J04202144+2813491 (also known as Tau 042021) [3] [6] is an edge-on protoplanetary disk in the Taurus Molecular Cloud. [3]The star is hidden behind the edge-on disk. Early estimates found that it has a mass of 0.272 ±0.009 M ☉, [7] but a later study did find a higher mass of 0.3–0.4 M
This is a list of circumstellar disks that have published resolved images. Many of them are protoplanetary disks or debris disks . Only some are transitional disks between protoplanetary and debris.
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. The protoplanetary disk may not be considered an accretion disk ; while the two are similar, an accretion disk is hotter and spins much faster; it is also found on black holes , not stars.
The protoplanetary disk around PDS 70 was first hypothesized in 1992 [14] and fully imaged in 2006 with phase-mask coronagraph on the VLT. [2] The disk has a radius of approximately 140 au . In 2012 a large gap (~ 65 au ) in the disk was discovered, which was thought to be caused by planetary formation.
This study also found that the disk is surrounded by a large "foot-like" structure seen in H-alpha. [5] This "foot-like" structure could however belong to the Herbig-Haro object HH 530, which is located just north of proplyd 114–426. [7] The disk was imaged with ALMA and the disk mass was estimated to be 3.38 ±0.56 M J. [8]
HD 163296 is a young Herbig Ae star that is surrounded by a protoplanetary disk. [6] The disk is a popular target to study disk composition [ 7 ] [ 8 ] [ 9 ] and several works suggested the presence of protoplanets inside the gaps of the disk.
A proplyd, short for ionized protoplanetary disk, is an externally illuminated photoevaporating protoplanetary disk around a young star. Nearly 180 proplyds have been discovered in the Orion Nebula . [ 1 ]