First Imaged Planet around a White Dwarf (WD 0806-661)

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First Imaged Planet around a White Dwarf (WD 0806-661)

Post by Edasich on 26th February 2011, 5:15 am

EPE page: http://exoplanet.eu/star.php?st=WD+0806-661

Discovery paper: Discovery of a candidate for the coolest known brown dwarf

We have used multi-epoch images from the Infrared Array Camera on board the Spitzer Space Telescope to search for substellar companions to stars in the solar neighborhood based on common proper motions. Through this work, we have discovered a faint companion to the white dwarf WD 0806-661. The comoving source has a projected separation of 130'', corresponding to 2500 AU at the distance of the primary (19.2 pc). If it is physically associated, then its absolute magnitude at 4.5 μm is ~1 mag fainter than the faintest known T dwarfs, making it a strong candidate for the coolest known brown dwarf. The combination of M 4.5 and the age of the primary (1.5 Gyr) implies an effective temperature of ~300 K and a mass of ~7 M Jup according to theoretical evolutionary models. The white dwarf's progenitor likely had a mass of ~2 MSun , and thus could have been born with a circumstellar disk that was sufficiently massive to produce a companion with this mass. Therefore, the companion could be either a brown dwarf that formed like a binary star or a giant planet that was born within a disk and has been dynamically scattered to a larger orbit

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Re: First Imaged Planet around a White Dwarf (WD 0806-661)

Post by Lazarus on 26th February 2011, 5:28 am

300 kelvin? Wow. If the spectral type sequence is useful below letter T, I guess this object should indicate this. As they say, the wide separation might indicate that this is a low-mass brown dwarf though...
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Re: First Imaged Planet around a White Dwarf (WD 0806-661)

Post by Sirius_Alpha on 28th February 2011, 9:17 pm

It's on arXiv now.
http://arxiv.org/abs/1102.5411

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Ultracool planet mass brown dwarf around WD 0806-661

Post by Stalker on 14th March 2011, 3:28 pm

Hi

http://iopscience.iop.org/2041-8205/730/1/L9

We have used multi-epoch images from the Infrared Array Camera on board the Spitzer Space Telescope to search for substellar companions to stars in the solar neighborhood based on common proper motions. Through this work, we have discovered a faint companion to the white dwarf WD 0806-661. The comoving source has a projected separation of 130'', corresponding to 2500 AU at the distance of the primary (19.2 pc). If it is physically associated, then its absolute magnitude at 4.5 μm is ~1 mag fainter than the faintest known T dwarfs, making it a strong candidate for the coolest known brown dwarf. The combination of M 4.5 and the age of the primary (1.5 Gyr) implies an effective temperature of ~300 K and a mass of ~7 M Jup according to theoretical evolutionary models. The white dwarf's progenitor likely had a mass of ~2 M , and thus could have been born with a circumstellar disk that was sufficiently massive to produce a companion with this mass. Therefore, the companion could be either a brown dwarf that formed like a binary star or a giant planet that was born within a disk and has been dynamically scattered to a larger orbit.

http://www.theweatherspace.com/news/TWS-3_13_2011_browndwarf.html

http://news.discovery.com/space/ultra-cold-brown-dwarf-new-record-breaker-110312.html

http://www.newscientist.com/article/mg20928034.600-newly-found-brown-dwarf-is-ultracool.html

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Re: First Imaged Planet around a White Dwarf (WD 0806-661)

Post by Sirius_Alpha on 14th March 2011, 3:47 pm

Merging this thread with the one already discussing this discovery. Added star name to thread title.

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Re: First Imaged Planet around a White Dwarf (WD 0806-661)

Post by Stalker on 15th March 2011, 2:09 am

I'm sorry

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Re: First Imaged Planet around a White Dwarf (WD 0806-661)

Post by Sirius_Alpha on 15th March 2011, 2:33 am

Stalker wrote:I'm sorry
Not a problem, just keeping things organised. Smile

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Re: First Imaged Planet around a White Dwarf (WD 0806-661)

Post by Sirius_Alpha on 20th March 2011, 8:36 pm

The Ultra Cool Brown Dwarf WD 0806-661B: Age, Mass, and Formation Mechanism
They find a mass of < 10 - 13 MJ and a temperature < 400 K.

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Re: First Imaged Planet around a White Dwarf (WD 0806-661)

Post by Lazarus on 21st March 2011, 2:21 pm

The discussion of formation mechanisms is a worthwhile read, yet more arguments against the IAU definition of the distinction between planets and brown dwarfs.

Wasn't aware of the evidence against planet-planet scattering for forming these wide-separation objects either.
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Re: First Imaged Planet around a White Dwarf (WD 0806-661)

Post by Edasich on 21st March 2011, 4:07 pm

Exoplanetary physics just keep us surprising Smile
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Re: First Imaged Planet around a White Dwarf (WD 0806-661)

Post by Lazarus on 20th October 2011, 3:47 am

Confirmation of One of the Coldest Known Brown Dwarfs

Apparently WD 08061-661B is a contender for the coolest currently-known brown dwarf with the Y dwarf WISEP J1828+2650, and may itself be a Y dwarf. Updated mass range 6-9 Jupiter masses, so at the low end of the brown dwarf mass range.
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Re: First Imaged Planet around a White Dwarf (WD 0806-661)

Post by Sirius_Alpha on 22nd September 2014, 9:19 pm

Near-infrared Detection of WD 0806-661 B with the Hubble Space Telescope
http://arxiv.org/abs/1409.5897

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Re: First Imaged Planet around a White Dwarf (WD 0806-661)

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