Prebiotic atmosphere discovered on accretion disk of baby star

Prebiotic atmosphere discovered on accretion disk of baby star
Figure 1: Jet, disk, and disk atmosphere in the HH 212 protostellar system. (a) A composite image for the HH 212 jet in different molecules, combining the images from the Very Large Telescope (McCaughrean et al. 2002) and ALMA (Lee et al. 2015). Orange image shows the dusty envelope+disk mapped with ALMA.  (b) A zoom-in to the central dusty disk. The asterisk marks the position of the protostar. A size scale of our solar system is shown in the lower right corner for comparison. (c) Atmosphere of the accretion disk detected with ALMA. In the disk atmosphere, green is for deuterated methanol, blue for methanethiol, and red for formamide. Credit: ALMA (ESO/NAOJ/NRAO)/Lee et al.

An international research team, led by Chin-Fei Lee of the Academia Sinica Institute of Astronomy and Astrophysics (ASIAA, Taiwan), has used the Atacama Large Millimeter/submillimeter Array (ALMA) to detect complex organic molecules for the first time in the atmosphere of an accretion disk around a very young protostar. These molecules play a crucial role in producing the rich organic chemistry needed for life. The discovery suggests that the building blocks of life are produced in such disks at the very beginning of star formation and that they are available to be incorporated into planets that form in the disk subsequently. It could help us understand how life came to be on Earth.

"It is so exciting to discover on an around a baby star," says Chin-Fei Lee at ASIAA. "When such molecules were first found in the around a star in a later phase of star formation, we wondered if they could have formed earlier. Now, using ALMA's unprecedented combination of spatial resolution and sensitivity, we not only detect them on a younger accretion disk, but also determine their location. These molecules are the of life, and they are already there in the disk atmosphere around the in the earliest phase of ."

Herbig-Haro (HH) 212 is a nearby protostellar system in Orion at a distance of about 1,300 light-years. The central protostar is very young, with an estimated age of only 40,000 years—about 1/100,000th the age of our sun—and a mass of only 0.2 solar mass. It drives a powerful bipolar jet and thus must accrete material efficiently. Indeed, an accretion disk is seen feeding the protostar. The disk is nearly edge-on and has a radius of about 60 astronomical units (AU), or 60 times the average Earth-sun distance. Interestingly, it shows a prominent equatorial dark lane sandwiched between two brighter features, looking like a "space hamburger."

Prebiotic atmosphere discovered on accretion disk of baby star
Figure 2: A 3D cartoon showing an atmosphere of complex organic molecules on an accretion disk. The bluish structure is the accretion disk. The pink layers above and below the disk are the disk atmosphere, in which complex organic molecules including methanol, deuterated methanol, methanethiol, and formamide are detected. For the molecular models, white is hydrogen (H), blue is deuterium (D), black is carbon (C), red is oxygen (O), purple is nitrogen (N), and yellow is sulfur (S). Credit: Lee, C.

The research team's ALMA observations have clearly detected an atmosphere of complex organic molecules above and below the disk. These include methanol (CH3OH), deuterated methanol (CH2DOH), methanethiol (CH3SH), and formamide (NH2CHO). These molecules have been proposed to be the precursors for producing biomolecules such as amino acids and sugars. "They are likely formed on icy grains in the and then released into the gas phase because of heating from stellar radiation or some other means, such as shocks," says co-author Zhi-Yun Li of the University of Virginia.

The team's observations open up an exciting possibility of detecting complex organic molecules in disks around other baby stars through high-resolution and high-sensitivity imaging with ALMA, which provides strong constraints on theories of prebiotic chemistry in star and planet formation. In addition, the observations open up the possibility of detecting more complex organic molecules and biomolecules that could shed light on the origin of life.

Prebiotic atmosphere discovered on accretion disk of baby star
Figure 3: Artistic conception of an atmosphere of complex organic molecules on an accretion disk around an embedded baby star with a powerful jet. Credit: ASIAA/ Jung-Shan Chang
Credit: Academia Sinica

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Methanol detected for first time around young star

More information: Chin-Fei Lee et al. Formation and Atmosphere of Complex Organic Molecules of the HH 212 Protostellar Disk, The Astrophysical Journal (2017). DOI: 10.3847/1538-4357/aa7757
Journal information: Astrophysical Journal

Provided by Academia Sinica
Citation: Prebiotic atmosphere discovered on accretion disk of baby star (2017, June 30) retrieved 22 August 2019 from https://phys.org/news/2017-06-prebiotic-atmosphere-accretion-disk-baby.html
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Jun 30, 2017
That is clearly the Silfen Gas Halo
..that is sci-fi and completely out of context. This is reality.

An important and valuable discovery such as this should not be made light of. This is brilliant work.

Jul 01, 2017
It drives a powerful bipolar jet and thus must accrete material efficiently.

This is but circular reasoning from the plasma ignoramuses. Jets such as this are an expected outcome of plasma processes with adequate charge density driving the currents.
An important and valuable discovery such as this should not be made light of. This is brilliant work.

This is nothing more than fanciful conjecture produced by another plasma ignoramus who has likely never even seen a plasma in a lab environment.

RNP
Jul 02, 2017
@cantdrive85
This is but circular reasoning from the plasma ignoramuses. Jets such as this are an expected outcome of plasma processes with adequate charge density driving the currents.

As usual your post is simply nonsense and is based on your complete lack of understanding of REAL physics.

Your posts therefore serve no other purpose than to demonstrate you to be a SCIENCE ignoramus. I suggest you give it up for the sake of your reputation (such as it is).

Jul 02, 2017
All I have to say about it those are some impressive telescopes.

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