From RAS: “Astronomers peer into the ‘amniotic sac’ of a planet-hosting star”

Royal Astronomical Society

Royal Astronomical Society

14 September 2015
Media contact
Sarah Reed
University of Leeds
Tel: +44 (0)113 343 4196
s.j.reed@leeds.ac.uk

Science contacts
Dr Ignacio Mendigutía
University of Leeds
Tel: +44(0)113 34 33871
I.Mendigutia@leeds.ac.uk

Professor Rene Oudmaijer
University of Leeds
Tel: +44 (0)113 34 33886
roud@ast.leeds.ac.uk

1
This image from the NASA/ESA Hubble Space Telescope shows a visible light view of the outer dust around the young star HD 100546. The position of the newly discovered protoplanet is marked with an orange spot. The inner part of this picture is dominated by artifacts from the brilliant central star, which has been digitally subtracted, and the black blobs are not real.
Date 28 February 2013, 16:00:00
Source http://www.eso.org/public/images/eso1310d/
Author ESO/NASA/ESA/Ardila et al.

NASA Hubble Telescope
NASA/ESA Hubble

Astronomers have successfully peered through the ‘amniotic sac’ of a star that is still forming to observe the innermost region of a burgeoning solar system for the first time.

In a research paper published today in the journal Monthly Notices of the Royal Astronomical Society, an international team of astronomers describe surprising findings in their observations of the parent star, which is called HD 100546.

Lead author Dr Ignacio Mendigutía, from the School of Physics and Astronomy at the University of Leeds, said: “Nobody has ever been able to probe this close to a star that is still forming and which also has at least one planet so close in.

“We have been able to detect for the first time emission from the innermost part of the disk of gas that surrounds the central star. Unexpectedly, this emission is similar to that of ‘barren’ young stars that do not show any signs of active planet formation.”

To observe this distant system, the astronomers used the [ESO] Very Large Telescope Interferometer (VLTI), which is based in an observatory in Chile. The VLTI combines the observing power of four 8.2m-wide telescopes and can make images as sharp as that of a single telescope that is 130m in diameter.

ESOVLTI
ESO VLTI MIDI
ESO VLTI

Professor Rene Oudmaijer, a co-author of the study, also from the University’s School of Physics and Astronomy, said: “Considering the large distance that separates us from the star (325 light-years), the challenge was similar to trying to observe something the size of a pinhead from 100km away.”

HD 100546 is a young star (only a thousandth of the age of the Sun) surrounded by a disk-shaped structure of gas and dust, called a ‘proto-planetary disk‘, in which planets can form. Such disks are common around young stars, but the one around HD 100546 is very peculiar: if the star were placed at the centre of our Solar System, the outer part of the disk would extend up to around ten times the orbit of Pluto.

Dr Mendigutía said: “More interestingly, the disk exhibits a gap that is devoid of material. This gap is very large, about 10 times the size of the space that separates the Sun from the Earth. The inner disk of gas could only survive for a few years before being trapped by the central star, so it must be continuously replenished somehow.

“We suggest that the gravitational influence of the still-forming planet – or possibly planets – in the gap could be boosting a transfer of material from the gas-rich outer part of the disk to the inner regions.”

Systems such as HD 100546 which are known to have both a planet and a gap in the proto-planetary disk are extremely rare. The only other example that has been reported is of a system in which the gap in the disk is ten times further out from the parent star than the one in the new study.

“With our observations of the inner disk of gas in the HD 100546 system, we are beginning to understand the earliest life of planet-hosting stars on a scale that is comparable to our Solar System,” concludes Professor Oudmaijer.

See the full article here .

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