Circumstellar Disks

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Re: Circumstellar Disks

Post by Roland Borrey on 18th November 2010, 2:33 pm

Publish in The Astrophysical Journal letters is the results of a Computer simulation by UC Santa Cruz on the planetes formation predicting that "Many of the galaxy's planets orbit so close to their parent stars that their surfaces are seas of molten lava-hardly ideal conditions for life".

A large number of the planet population were rocky planets up to 10 times the mass of earth orbiting their host star in a 24 hours orbit.
The planets formed futher away but in 100K years migrated. Many of the planets were ripped apart and were desintegrated.
Full posting at :
[url=http://news.sciencesmag.org/sciencenew ]http://news.sciencesmag.org/sciencenew [/url]

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Re: Circumstellar Disks

Post by Sunchaser on 29th February 2012, 9:07 am

Old(er) thread, I know, and since then, many exciting discoveries...but I have a few that I didn't see listed...

Tau1 Eridani
GAM Dor
DM+79 169
BET UMa
BET Leo
GAM Ser
DM -47 13928

Taken from Astrophysical Data: Planets and Stars p 374 "Circumstellar Dust Shells with Infrared (60-micron) Excess"

-M-

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Re: Circumstellar Disks

Post by Led_Zep on 12th July 2013, 3:53 am

http://www.skyandtelescope.com/news/home/Ring-Around-the-Dusk-Disk-214925761.html

Dusty disks that encircle young stars sometimes host giant gaps. But a new study shows these gaps aren't necessarily the signature of a nearby planet.

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Re: Circumstellar Disks

Post by Sirius_Alpha on 16th March 2014, 8:27 pm

108 new debris disk systems from WISE


A Sensitive Identification of Warm Debris Disks in the Solar Neighborhood Through Precise Calibration of Saturated WISE Photometry
http://arxiv.org/abs/1403.3435

We present a sensitive search for WISE W3 (12um) and W4 (22um) excesses from warm optically thin dust around Hipparcos main sequence stars within 75pc from the Sun. We use contemporaneously measured photometry from WISE, remove sources of contamination, and derive and apply corrections to saturated fluxes to attain optimal sensitivity to >10um excesses. We use data from the WISE All-Sky Survey Catalog rather than the AllWISE release, because we find that its saturated photometry is better behaved, allowing us to detect small excesses even around saturated stars in WISE. Our new discoveries increase by 45% the number of stars with warm dusty excesses and expand the number of known debris disks (with excess at any wavelength) within 75pc by 29%. We identify 220 Hipparcos debris disk-host stars, 108 of which are new detections at any wavelength. We present the first measurement of a 12um and/or 22um excess for 10 stars with previously known cold (50-100 K) disks. We also find five new stars with small but significant W3 excesses, adding to the small population of known exozodi, and we detect evidence for a W2 excess around HIP96562 (F2V), indicative of tenuous hot (780 K) dust. As a result of our WISE study, the number of debris disks with known 10-30um excesses within 75pc (379) has now surpassed the number of disks with known >30um excesses (289, with 171 in common), even if the latter have been found to have a higher occurrence rate in unbiased samples.

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Re: Circumstellar Disks

Post by Sirius_Alpha on 25th March 2014, 8:28 pm

Correlations between the stellar, planetary and debris components of exoplanet systems observed by Herschel
http://arxiv.org/abs/1403.6186

11 detected exoplanet hosts (they include Tau Cet) with disks.

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Re: Circumstellar Disks

Post by Led_Zep on 6th November 2014, 2:34 pm

http://hubblesite.org/newscenter/archive/releases/2014/44/full/

Hubble Surveys Debris-Strewn Exoplanetary Construction Yards

Astronomers using NASA's Hubble Space Telescope have completed the largest and most sensitive visible-light imaging survey of dusty debris disks around other stars. These dusty disks, likely created by collisions between leftover objects from planet formation, were imaged around stars as young as 10 million years old and as mature as more than 1 billion years old.

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Re: Circumstellar Disks

Post by Led_Zep on 10th November 2016, 6:10 am

http://www.eso.org/public/unitedkingdom/news/eso1640/?lang

Sculpting Solar Systems
ESO’s SPHERE instrument reveals protoplanetary discs being shaped by newborn planets

Links for papers about RXJ1615, HD97048 and HD135344B

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Re: Circumstellar Disks

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