MPE: Molecular Outflow Launched Beyond the Disk Around a Young Star

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bystander
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MPE: Molecular Outflow Launched Beyond the Disk Around a Young Star

Post by bystander » Thu Jul 13, 2017 6:48 pm

Molecular Outflow Launched Beyond the Disk Around a Young Star
Max Planck Institute for Extraterrestrial Physics (MPE) | 2017 Jul 13
[img3="This radio image obtained with ALMA shows the intensity of the dust continuum emission of BHB07-11. The contrast between the disk and the envelope including spirals is clearly visible. (Credit: MPE/ALMA"]http://www.mpe.mpg.de/6742308/zoom-1499692689.jpg[/img3][hr][/hr]
For the first time, an international team of astronomers led by the Max Planck Institute for Extraterrestrial Physics (MPE) has observed a molecular outflow being launched from beyond the disk surrounding a young stellar object. Outflows carry away excess angular momentum and it has been proposed that these disk winds should be launched from a wide region in the protoplanetary disk. The recent observations now show that the outflows are asymmetric and that they are launched beyond the edge of the disk, at the position of the landing site of the in-falling material.

A long-standing problem of star formation is how to get rid of the excess of angular momentum from in-falling material in the molecular cloud where a young star is born. In the classical picture, angular momentum is removed both by a stellar wind close to the newly formed star and by a disk wind from a wide region in the protoplanetary disk around the star. The exact location from where such disk winds are launched, however, is not well known.

Low-mass Young Stellar Objects (YSO), the precursors of Solar-type stars, have a prominent circumstellar disk surrounded by a tenuous envelope. The structure and kinematics of the environment of such young stars can be studied at radio wavelengths, where the dust in disk and envelope emits thermal radiation and where rotational transitions of some simple molecules (such as CO) can be used as tracers of gas motions. An international team of astronomers, led by the Max Planck Institute for Extraterrestrial Physics (MPE), now used the ALMA radio telescope to investigate the young stellar object BHB07-11, which is embedded in the Barnard 59 dense core in the Pipe nebula.

Molecular Outflow Launched Beyond the Disk Edge - Felipe O. Alves et al
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MargaritaMc
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Re: MPE: Molecular Outflow Launched Beyond the Disk Around a Young Star

Post by MargaritaMc » Thu Jul 13, 2017 7:58 pm

These seem to be relevant articles on the same subject:
Star formation: Desperately seeking spin
Deirdre Coffey
https://www.nature.com/articles/s41550-017-0180

A rotating protostellar jet launched from the innermost disk of HH 212
Chin-Fei Lee, Paul. T. P Ho et al
https://www.nature.com/articles/s41550-017-0152
and
Disk-driven rotating bipolar outflow in Orion Source I
Tomoya Hirota, Masahiro N. Machida
https://www.nature.com/articles/s41550-017-0146
"In those rare moments of total quiet with a dark sky, I again feel the awe that struck me as a child. The feeling is utterly overwhelming as my mind races out across the stars. I feel peaceful and serene."
— Dr Debra M. Elmegreen, Fellow of the AAAS

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bystander
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Re: MPE: Molecular Outflow Launched Beyond the Disk Around a Young Star

Post by bystander » Fri Jul 14, 2017 3:50 am

MargaritaMc wrote:A rotating protostellar jet launched from the innermost disk of HH 212
Chin-Fei Lee, Paul. T. P Ho et al
https://www.nature.com/articles/s41550-017-0152
ALMA: Baby Star Spits a "Spinning Jet"
http://asterisk.apod.com/viewtopic.php?t=37277
MargaritaMc wrote:Disk-driven rotating bipolar outflow in Orion Source I
Tomoya Hirota, Masahiro N. Machida
https://www.nature.com/articles/s41550-017-0146
ALMA Observes Birth Cry of a Massive Baby Star
http://asterisk.apod.com/viewtopic.php?t=37276
Know the quiet place within your heart and touch the rainbow of possibility; be
alive to the gentle breeze of communication, and please stop being such a jerk.
— Garrison Keillor

starsurfer
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Re: MPE: Molecular Outflow Launched Beyond the Disk Around a Young Star

Post by starsurfer » Sat Jul 15, 2017 10:25 am

MargaritaMc wrote:These seem to be relevant articles on the same subject:
Star formation: Desperately seeking spin
Deirdre Coffey
https://www.nature.com/articles/s41550-017-0180

A rotating protostellar jet launched from the innermost disk of HH 212
Chin-Fei Lee, Paul. T. P Ho et al
https://www.nature.com/articles/s41550-017-0152
and
Disk-driven rotating bipolar outflow in Orion Source I
Tomoya Hirota, Masahiro N. Machida
https://www.nature.com/articles/s41550-017-0146
OMG you're back?! I've missed you! :content:

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MargaritaMc
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Re: MPE: Molecular Outflow Launched Beyond the Disk Around a Young Star

Post by MargaritaMc » Tue Jul 18, 2017 6:27 am

starsurfer wrote: OMG you're back?! I've missed you! :content:
Thank you!
It's really odd to "do" astronomy in English after focusing on Spanish for the last year.
"In those rare moments of total quiet with a dark sky, I again feel the awe that struck me as a child. The feeling is utterly overwhelming as my mind races out across the stars. I feel peaceful and serene."
— Dr Debra M. Elmegreen, Fellow of the AAAS