Accreting protoplanets in the LkCa 15 transition disk

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Accreting protoplanets in the LkCa 15 transition disk

Post by Stalker on 18th November 2015, 3:49 pm

Accreting protoplanets in the LkCa 15 transition disk
S. Sallum, K. B. Follette, J. A. Eisner, L. M. Close, P. Hinz, K. Kratter, J. Males, A. Skemer, B. Macintosh, P. Tuthill, V. Bailey, D. Defrère, K. Morzinski, T. Rodigas, E. Spalding, A. Vaz & A. J. Weinberger wrote:Exoplanet detections have revolutionized astronomy, offering new insights into solar system architecture and planet demographics. While nearly 1,900 exoplanets have now been discovered and confirmed1, none are still in the process of formation. Transition disks, protoplanetary disks with inner clearings2, 3, 4 best explained by the influence of accreting planets5, are natural laboratories for the study of planet formation. Some transition disks show evidence for the presence of young planets in the form of disk asymmetries6, 7 or infrared sources detected within their clearings, as in the case of LkCa 15 (refs 8, 9). Attempts to observe directly signatures of accretion onto protoplanets have hitherto proven unsuccessful10. Here we report adaptive optics observations of LkCa 15 that probe within the disk clearing. With accurate source positions over multiple epochs spanning 2009–2015, we infer the presence of multiple companions on Keplerian orbits. We directly detect Hα emission from the innermost companion, LkCa 15 b, evincing hot (about 10,000 kelvin) gas falling deep into the potential well of an accreting protoplanet.

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Re: Accreting protoplanets in the LkCa 15 transition disk

Post by Led_Zep on 18th November 2015, 5:40 pm

http://www.space.com/31146-alien-planet-formation-photographed.html

"It's exciting, because it's the first time that we've been able to image forming planets directly," study lead author Stephanie Sallum
(…)

The team confirmed the existence of LkCA 15b, imaging it directly in hydrogen-alpha photons, a type of light that's emitted when superheated material accretes onto a newly forming world. (Like newborn stars, newborn planets are surrounded by disks of feeder material.)
Other LBT observations revealed the presence of another newborn planet, LkCA 15c, inside the gap and suggested that a third (LkCA 15d) exists there as well, study team members report online today (Nov. 18) in the journal Nature



See also : http://solar-flux.forumandco.com/t954-protoplanet-imaged-at-lkca-15

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Re: Accreting protoplanets in the LkCa 15 transition disk

Post by Stalker on 19th November 2015, 3:53 am

https://www.newscientist.com/article/dn28503-baby-photos-of-distant-planet-are-first-to-capture-formation?utm_source=NSNS&utm_medium=SOC&utm_campaign=hoot&cmpid=SOC%252525257CNSNS%252525257C2015-GLOBAL-hoot

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Re: Accreting protoplanets in the LkCa 15 transition disk

Post by Sirius_Alpha on 22nd November 2015, 11:31 am

Here's the paper, but I don't have access to it. Figure 1 helps make sense of the protoplanet orbits to me.

Accreting protoplanets in the LkCa 15 transition disk
http://www.nature.com/nature/journal/v527/n7578/full/nature15761.html


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Re: Accreting protoplanets in the LkCa 15 transition disk

Post by Sirius_Alpha on 24th November 2015, 9:26 pm

And now finally free to access on arXiv.
http://arxiv.org/abs/1511.07456

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Re: Accreting protoplanets in the LkCa 15 transition disk

Post by Led_Zep on 8th July 2016, 6:53 pm

Some slides from Davos meeting
New results with SPHERE/VLT :

[URL=http://imgbox.com/cSCGnCrV]

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Re: Accreting protoplanets in the LkCa 15 transition disk

Post by Lazarus on 1st September 2016, 3:42 am

Paper on the SPHERE results:

Thalmann et al. "Resolving the planet-hosting inner regions of the LkCa 15 disk"
http://arxiv.org/abs/1608.08642

There may be a case for "b" being a protoplanet but "c" and "d" may actually be accounted for by the inner disc.

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Re: Accreting protoplanets in the LkCa 15 transition disk

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