The
NASA/ESA Hubble Space Telescope has snapped a striking view of a
multiple star system called XZ Tauri, its neighbor HL Tauri, and several
nearby young stellar objects. XZ Tauri is blowing a hot bubble of gas
into the surrounding space, which is filled with bright and beautiful
clumps that are emitting strong winds and jets. These objects illuminate
the region, creating a truly dramatic scene.
This dark and ominous landscape is located some 450 light-years away
in the constellation of Taurus (The Bull). It lies in the northeastern
part of a large, dark cloud known as LDN 1551.
Just to the left of center in this image, embedded within a
rust-colored cloud, lies XZ Tauri. While it appears to be a single star,
this bright spot actually consists of several stars. It has long been
known to be a binary, but one of these two stars is thought also to be a
binary, making a total of three stars within a single system.
This is not the first time that Hubble has observed XZ Tauri —
between the years of 1995 and 2000, a hot bubble of gas was spotted
expanding outwards from the system. This bubble can be seen as the small
orange lobe very close to the top left of XZ Tauri. This gas is
speeding out from the star system, leaving a trail spanning tens of
billions of kilometers. As the bubble travels it hits slower moving
material, triggering pulses of light and rippling shockwaves.
Above and to the right of XZ Tauri, an equally epic scene is
unfolding. Wisps of deep red seem to be streaking away from the
blue-tinged clumps on the right. This bright blue patch contains a star
known as HL Tauri, which is associated with Herbig-Haro object HH 150.
Herbig-Haro objects are streaks of hot gas blasted into space by newborn
and newly forming stars and LDN 1551 is particularly rich in these
dramatic objects.
In the bottom right of this Hubble image is another Herbig-Haro
object known as HH 30 (opo9905), associated with the variable star V1213
Tauri. The star itself is hidden within a flat, bright disk of dust
that is split in half by a dark lane. This dust blocks direct light from
V1213 Tauri, but the star is visible via its reflected light and the
prominent, knotty jets it is blasting out into space.
Hubble previously viewed HH 30, alongside XZ Tauri, with its Wide
Field Planetary Camera 2 between the years of 1995 and 2000. The
observations were used to image and study the changes in disk brightness
and jet strength over the five-year period. V1213 Tauri’s strong
magnetic field forms the jets by funneling and shepherding gas from the
disk, accelerating it along the star’s magnetic poles to form two narrow
beams.
In a press release issued by the European Southern Observatory today
observations from the Atacama Large Millimeter/submillimeter Array
(ALMA) reveal extraordinarily fine and never-before-seen detail in the
planet-forming disk around HL Tauri. The new observations are an
enormous step forward in the observation of how protoplanetary disks
develop and how planets form.
Image credit: ESA/Hubble and NASA; acknowledgement: Judy Schmidt
Text credit: European Space Agency
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