Spring Cleaning in an Infant Star System

This image depicts the dusty disc encircling the young, isolated star HD 169142. The Atacama Large Millimeter/submillimeter Array (ALMA) imaged this disc in high resolution by picking up faint signals from its constituent millimetre-sized dust grains. The vivid rings are thick bands of dust, separated by deep gaps.

Optimised to study the cold gas and dust of systems like HD 169142, ALMA’s sharp eyes have revealed the structure of many infant solar systems with similar cavities and gaps. A variety of theories have been proposed to explain them — such as turbulence caused by magnetorotational instability, or the fusing of dust grains — but the most plausible explanation is that these pronounced gaps were carved out by giant protoplanets.

When solar systems form gas and dust coalesce into planets. These planets then effectively spring clean their orbits, clearing them of gas and dust and herding the remaining material into well-defined bands. The deep gaps seen in this image are consistent with the presence of multiple protoplanets — a finding that agrees with other optical and infrared studies of the same system.

Observing such dusty protoplanetary discs with ALMA allows scientists to investigate the first steps of planet formation in a bid to unveil the evolutionary paths of these infant systems.


Autorska prava:

ALMA (ESO/NAOJ/NRAO)/ Fedele et al.

O slici

Datum objavljivanja:3. april 2017. 06:00
Veličina:2000 x 2000 px

O objektu

Naziv:HD 169142
Tip:Milky Way : Star : Circumstellar Material : Disk : Protoplanetary
Udaljenost:380 svetlosnih godina

Formati slika

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Position (RA):18 24 29.78
Position (Dec):-29° 46' 49.90"
Field of view:0.01 x 0.01 arcminutes
Orijentacija:Sever je -0.0°levo od vertikale

Boje i flteri

OpsegTalasna dužinaTeleskop
230 GHz
1.3 mmAtacama Large Millimeter/submillimeter Array
Band 6