Contact Information:

Media Contact

Sarah Reed
s.j.reed@leeds.ac.uk
44-113-343-4196

Twitter: universityleeds

http://www.leeds.ac.uk




Kredyty mieszkaniowe Kredyty mieszkaniowe

Sprawdź aktualny ranking najlepszych kredytów mieszkaniowych w Polsce - atrakcyjne kredytowanie nieruchomości.

PRESS-NEWS.org - Press Release Distribution
FREE PRESS RELEASES DISTRIBUTION
RSS - Press News Release
Add Press Release

Astronomers peer into the 'amniotic sac' of a planet-hosting star


2015-09-14
(Press-News.org) 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 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.

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.

INFORMATION:

Further information

The research paper, 'High resolution Brγ spectro-interferometry of the transitional Herbig Ae/Be star HD 100546: A Keplerian gaseous disc inside the inner rim', is published online in the journal Monthly Notices of the Royal Astronomical Society, which is published by Oxford University Press: http://mnras.oxfordjournals.org/lookup/doi/10.1093/mnras/stv1777

Dr Ignacio Mendigutía and Professor Rene Oudmaijer are available for interview. Please contact Sarah Reed, Press Officer at the University of Leeds, on 0113 34 34196 or email s.j.reed@leeds.ac.uk.


ELSE PRESS RELEASES FROM THIS DATE:

Study links marijuana use to poor blood sugar control in middle age

2015-09-14
New research published in Diabetologia (the journal of the European Association for the Study of Diabetes) shows that current and former users of marijuana are more likely to have prediabetes--the state of poor blood sugar control that can progress to type 2 diabetes--than never users of marijuana. However the researchers, led by Mike Bancks (University of Minnesota School of Public Health, Minneapolis, MN, USA) failed to establish a direct link between marijuana use and type 2 diabetes. Marijuana is the most frequently used illicit drug in America (and is estimated to ...

Climate research: Where is the world's permafrost thawing?

2015-09-13
Bremerhaven (Germany), 14th September 2015. This Saturday at a conference in Quebec, Canada an international research team will present the first online data portal on global permafrost. In the Global Terrestrial Network for Permafrost researchers first collect all the existing permafrost temperature and active thickness layer data from Arctic, Antarctic and mountain permafrost regions and then make it freely available for download. This new portal can serve as an early warning system for researchers and decision-makers around the globe. A detailed description of the data ...

Study: No sex differences in research funding at Johns Hopkins Department of Medicine

2015-09-12
Though national data suggest that women researchers are less likely to obtain independent research funding than men, a study published in the Journal of Women's Health found that male and female researchers at the Johns Hopkins University School of Medicine are funded at nearly the same rate. Rita Rastogi Kalyani, M.D., M.H.S.; Hsin-Chieh Yeh, Ph.D.; Jeanne Clarke, M.D., M.P.H.; Myron Weisfeldt, M.D.; Terry Choi; and Susan McDonald, M.D., all of Johns Hopkins, authored the study. Kalyani points out that, in recent years, Johns Hopkins has demonstrated a commitment to ...

Resveratrol impacts Alzheimer's disease biomarker

2015-09-11
WASHINGTON (Sept. 11, 2015) -- The largest nationwide clinical trial to study high-dose resveratrol long-term in people with mild to moderate Alzheimer's disease found that a biomarker that declines when the disease progresses was stabilized in people who took the purified form of resveratrol. Resveratrol is a naturally occurring compound found in foods such as red grapes, raspberries, dark chocolate and some red wines. The results, published online today in Neurology, "are very interesting," says the study's principal investigator, R. Scott Turner, MD, PhD, director ...

Achieving effective health care with a new approach to caring for chronic illnesses

2015-09-11
CORAL GABLES, Fla. (September 11, 2015) -- Researchers from the University of Miami and Harvard University address the challenges of effective universal health coverage in low- and middle-income countries, focusing on solving one of the most pressing issues: the care of chronic illnesses. Their suggestions, aimed at strengthening health care systems, include recommendations based on a "diagonal approach" for managing health care. Their report is published in the September issue of the journal Health Affairs. The authors shared their findings on Wednesday, September 9, ...

Burning remaining fossil fuel could cause 60-meter sea level rise

Burning remaining fossil fuel could cause 60-meter sea level rise
2015-09-11
Washington, DC--New work from an international team including Carnegie's Ken Caldeira demonstrates that the planet's remaining fossil fuel resources would be sufficient to melt nearly all of Antarctica if burned, leading to a 50- or 60-meter (160 to 200 foot) rise in sea level. Because so many major cities are at or near sea level, this would put many highly populated areas where more than a billion people live under water, including New York City and Washington, DC. It is published in Science Advances. "Our findings show that if we do not want to melt Antarctica, we ...

Burning all fossil energy would eliminate all ice of Antarctica

2015-09-11
Burning all of the world's available fossil-fuel resources would result in the complete melting of the Antarctic ice sheet, a new study to be published in Science Advances shows. The Antarctic ice masses store water equivalent to more than 50 meters of sea-level rise. The new calculations show that Antarctica's long-term contribution to sea-level rise could likely be restricted to a few meters that could still be manageable, if global warming did not exceed 2 degrees. Crossing this threshold, however, would in the long run destabilize both West and East Antarctica - causing ...

Study shows Africanized bees continue to spread in California

2015-09-11
A study conducted by biologists at UC San Diego has found that the Africanized honey bee--an aggressive hybrid of the European honey bee--is continuing to expand its range northward since its introduction into Southern California in 1994. The study, published in this week's edition of the journal PLOS ONE, found that more than 60 percent of the foraging honey bees in San Diego County are Africanized and that Africanized bees can now be found as far north as California's delta region. "Our study shows that the large majority of bees one encounters in San Diego County are ...

Neural circuit in the cricket brain detects the rhythm of the right mating call

Neural circuit in the cricket brain detects the rhythm of the right mating call
2015-09-11
Scientists have identified an ingeniously elegant brain circuit consisting of just five nerve cells that allows female crickets to automatically identify the chirps of males from the same species through the rhythmic pulses hidden within the mating call. The circuit uses a time delay mechanism to match the gaps between pulses in a species-specific chirp - gaps of just few milliseconds. The circuit delays a pulse by the exact between-pulse gap, so that, if it coincides with the next pulse coming in, the same species signal is confirmed. It's one of the first times ...

Large eyes come at a high cost

2015-09-11
Researchers from Lund University in Sweden have shown that well-developed eyes come at a surprising cost to other organ systems. The study involving Mexican cavefish shows that the visual system can require between 5% and 15% of an animal's total energy budget. Researchers have long associated the presence of a well-developed brain with major energy consumption. This means that animals that develop advanced nervous systems require environments where this is possible. There has to be good access to nutrients, and every investment in an organ comes at a cost to some other ...

LAST 30 PRESS RELEASES:

How your brain decides blame and punishment -- and how it can be changed

Uniquely human brain region enables punishment decisions

Pinpointing punishment

Chapman University publishes research on attractiveness and mating

E-cigarettes: Special issue from Nicotine & Tobacco Research

Placental problems in early pregnancy associated with 5-fold increased risk of OB & fetal disorders

UT study: Invasive brood parasites a threat to native bird species

Criminals acquire guns through social connections

Restoring ocean health

Report: Cancer remains leading cause of death in US Hispanics

Twin study suggests genetic factors contribute to insomnia in adults

To be fragrant or not: Why do some male hairstreak butterflies lack scent organs?

International team discovers natural defense against HIV

Bolivian biodiversity observatory takes its first steps

Choice of college major influences lifetime earnings more than simply getting a degree

Dominant strain of drug-resistant MRSA decreases in hospitals, but persists in community

Synthetic biology needs robust safety mechanisms before real world application

US defense agencies increase investment in federal synthetic biology research

Robots help to map England's only deep-water Marine Conservation Zone

Mayo researchers identify protein -- may predict who will respond to PD-1 immunotherapy for melanoma

How much water do US fracking operations really use?

New approach to mammograms could improve reliability

The influence of citizen science grows despite some resistance

Unlocking secrets of how fossils form

What happens on the molecular level when smog gets into the lungs?

Using ultrasound to clean medical instruments

Platinum and iron oxide working together get the job done

Tiny silica particles could be used to repair damaged teeth, research shows

A quantum lab for everyone

No way? Charity's logo may influence perception of food in package

[Press-News.org] Astronomers peer into the 'amniotic sac' of a planet-hosting star
Press-News.org is a service of DragonFly Company. All Rights Reserved.
Issuers of news releases are solely responsible for the accuracy of their content.