Talk:HL Tauri

Thanks for the article!
Thanks. Rursus dixit. ( m bork3 !) 11:55, 7 November 2014 (UTC)

Age of HL Tauri system
The newest article seems to state that the system is approximately 1,000,000 years old while the older reference in the synopsis states only 100,000 years old. Is there a need to update the synopsis with the new information perhaps? — Preceding unsigned comment added by SBHans13 (talk • contribs) 20:58, 10 November 2014 (UTC)


 * Until a paper can be produced showing that data, I'd prefer to use the refereed material over a press release. Also, the ESO release seems to be saying that the system is a maximum of a million years old, not that it is a million years. — Huntster (t @ c) 21:26, 10 November 2014 (UTC)

Planets around HL Tauri
Is it true that although the exact nature and number of planets about HL Tauri is not known, it is known that HL Tauri has planets? --Artman40 (talk) 23:30, 10 November 2014 (UTC)


 * No, it is only theorised that the dark bands indicate planetesimal consolidation. We have no way of knowing for certain yet. — Huntster (t @ c) 02:21, 11 November 2014 (UTC)

Looks like there are new observations with the VLA and they propose that HL Tau has not well formed planets yet, but it is just starting to form planets. The authors even propose they found a clump which will be the "seed" or "embryo" of a future planet. Here is the link to a press article:

http://www.universetoday.com/127939/vla-shows-early-stages-planet-formation-unprecedented-detail/

and here to the scientific paper:

http://arxiv.org/pdf/1603.03731v1.pdf — Preceding unsigned comment added by 177.243.44.164 (talk) 20:36, 18 March 2016 (UTC)

Ferrous iron
I further clarified the last sentence of the paragraph about polar molecules (CO and H2) and iron. It already did make clear that "ferrous iron" means Fe(II), but I changed the wording so as to avoid saying "ferrous iron." Some readers might not see that it's referring to an oxidation state. I changed "Polar jets" to "jets of polar molecules" -- I think that's what's meant, but please do correct it if it's wrong.

Since this is of interest to people outside astronomy and the sciences, perhaps a note about the limitations of IR spectroscopy is in order -- that is, IR can't detect O2, N2, or metallic iron, so it does not rule out the presence of many substances that probably are present.

It's a good article and an interesting discovery. Roches (talk) 07:41, 12 November 2014 (UTC)


 * Great change to the ferrous iron bit...I was not sure how to best word it when I worded that originally. I'm not so sure about the polar change, but I'm weak in this area. Is the source referring to jets of chemical polarity, or jets originating from the rotational poles of the protostar? — Huntster (t @ c) 07:57, 12 November 2014 (UTC)
 * In this particular instance, it's jets originating from the rotational poles of the protostar. I'll change the wording. Primefac (talk) 17:51, 12 November 2014 (UTC)
 * EDIT: we even have an article on it (bipolar outflow). Primefac (talk) 17:57, 12 November 2014 (UTC)
 * Outstanding Primefac, thanks for finding it. — Huntster (t @ c) 18:33, 12 November 2014 (UTC)

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