Dust disks detected Herschel's

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Dust disks detected Herschel's

Post by Borislav on 23rd March 2010, 5:59 pm



Last edited by Borislav on 24th March 2010, 1:21 pm; edited 2 times in total

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Re: Dust disks detected Herschel's

Post by Borislav on 24th March 2010, 2:30 am

In addition, they write about the discovery of infrared excess at 70 microns in 51 Pegasi.

An interesting story about Zeta Reticuli.
http://en.wikipedia.org/wiki/Betty_and_Barney_Hill_abduction#.22Deciphering.22_the_star_map

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Re: Dust disks detected Herschel's

Post by Sirius_Alpha on 24th March 2010, 9:01 am

Interesting, but more comedy than science.

The disk to q1 Eridani has been known for quite some time. I don't recall about Zeta2 Reticuli however.

I didn't see anything about an excess at 51 Pegasi. Question

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Re: Dust disks detected Herschel's

Post by Borislav on 24th March 2010, 9:47 am

Sirius_Alpha wrote:The disk to q1 Eridani has been known for quite some time.

I was wrong.
http://exoplanets.jpl.nasa.gov/CES_Fair_208_Talks/32_krist_hst_debris_disks_talk.pdf


Sirius_Alpha wrote:I don't recall about Zeta2 Reticuli however.

Infrared excess discovery Spitzer, but Herschel first time resolved him.

http://herschel.esac.esa.int/SDP_wkshops/presentations/IR/35_Fedele_DUNES_SDP2009.pdf

- Debris dust detected in 2 (+1?) / 5 sources
- HIP15371: (candidate) exo-solar EKB analogue

Sirius_Alpha wrote:
I didn't see anything about an excess at 51 Pegasi.

F (Spitzer, 70 micron) 28.1 mJy

F (predicted, 100 micron) 10.8 mJy
F (observed, 100 micron) 12 mJy

F (predicted, 100 micron) < F (observed, 100 micron)

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Re: Dust disks detected Herschel's

Post by NuclearVacuum on 24th March 2010, 10:04 am

Not very interesting, I am sure the Greys found it millennia ago =P Lolz

That is quite interesting.

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Re: Dust disks detected Herschel's

Post by Borislav on 24th March 2010, 1:14 pm

four additional disk resolved by Herschel around nearby stars
http://herschel.esac.esa.int/SDP_wkshops/presentations/IR/36_Greaves_DEBRIS_SDP2009.pdf

renamed theme

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Re: Dust disks detected Herschel's

Post by Borislav on 24th March 2010, 1:42 pm

Zeta Tucanae is included in the 10 stars who have the search for analogues of the Earth on HARSP.

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Re: Dust disks detected Herschel's

Post by Lazarus on 24th March 2010, 3:40 pm

If you listen to the presentation associated with the pdf linked in the first post in this thread (see this thread in Extrasolar Mechanics), 51 Pegasi is mentioned as not having significant infrared excess.
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q1 Eridani and Zet2 Reticuli Disks Resolved by Herschel

Post by Sirius_Alpha on 18th May 2010, 8:11 pm

Resolving the cold debris disc around a planet-hosting star: PACS photometric imaging observations of q1 Eri (HD10647, HR506)
http://arxiv.org/abs/1005.3137

Abstract wrote:About two dozen exo-solar debris systems have been spatially resolved. These debris discs commonly display a variety of structural features such as clumps, rings, belts, eccentric distributions and spiral patterns. In most cases, these features are believed to be formed, shaped and maintained by the dynamical influence of planets orbiting the host stars. In very few cases has the presence of the dynamically important planet(s) been inferred from direct observation. The solar-type star q1 Eri is known to be surrounded by debris, extended on scales of < 30''. The star is known to host at least one planet, albeit on an orbit far too small to make it responsible for structures at distances of tens to hundreds of AU. The aim of the present investigation is twofold: to determine the optical and material properties of the debris and to infer the spatial distribution of the dust, which may hint at the presence of additional planets. The photodetector array camera and spectrometer (PACS) aboard the Herschel Space Observatory allows imaging observations in the far infrared at unprecedented resolution, i.e. at better than 6'' to 12'' over the wavelength range of 60 {\mu}m to 210 {\mu}m. Together with the results from ground-based observations, these spatially resolved data can be modelled to determine the nature of the debris and its evolution more reliably than would be possible from unresolved data alone. For the first time has the q1 Eri disc been resolved at far infrared wavelengths. The PACS observations at 70, 100 and 160 {\mu}m reveal an oval image showing a disc-like structure in all bands, the size of which increases with wavelength. Assuming a circular shape yields the inclination of its equatorial plane with respect to that of the sky, i > 53deg. The results of image de-convolution indicate that i likely is larger than 63deg, where 90deg corresponds to an edge-on disc. {abridged}

Cold dust around nearby stars (DUNES). First results: A resolved exo-Kuiper belt around the solar-like star zeta^2 Ret
http://arxiv.org/abs/1005.3151

Abstract wrote:We present the first far-IR observations of the solar-type stars delta Pav, HR 8501, 51 Peg and zeta^2 Ret, taken within the context of the DUNES Herschel Open Time Key Programme (OTKP). This project uses the PACS and SPIRE instruments with the objective of studying infrared excesses due to exo-Kuiper belts around nearby solar-type stars. The observed 100 um fluxes from delta Pav, HR 8501, and 51 Peg agree with the predicted photospheric fluxes, excluding debris disks brighter than Ldust/Lstar ~ 5 x 10^-7 (1 sigma level) around those stars. A flattened, disk-like structure with a semi-major axis of ~ 100 AU in size is detected around zeta^2 Ret. The resolved structure suggests the presence of an eccentric dust ring, which we interpret as an exo-Kuiper belt with Ldust/Lstar ~ 10^-5.

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Re: Dust disks detected Herschel's

Post by Borislav on 19th May 2010, 12:58 pm

Can combine with this topic?
http://solar-flux.forumandco.com/extrasolar-news-and-discoveries-f2/dust-disks-detected-herschel-s-t571.htm


In the Solar System, the asteroid and Kuiper belts are examples of debris systems; in particular, the Kuiper belt has an estimated dust luminosity Ldust/L*=10−7-10−6 (Stern 1996).


The observed 100 μm fluxes from delta Pav, HR 8501, and 51 Peg agree with the predicted
photospheric fluxes, excluding debris disks brighter than Ldust/L* = 5 × 10−7 (1 sigma level) around those stars


The resolved structure suggests the presence of an eccentric dust ring, which we
interpret as an exo-Kuiper belt with Ldust/L* = 10−5

Ie analogues of the Kuiper belt are found only in 25% of (1 of 4) stars similar to the Sun?

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Re: Dust disks detected Herschel's

Post by Sirius_Alpha on 19th May 2010, 2:55 pm

Borislav wrote:Can combine with this topic?http://solar-flux.forumandco.com/extrasolar-news-and-discoveries-f2/dust-disks-detected-herschel-s-t571.htm

I knew we had discussed these two systems before but couldn't find the thread. Thanks! Merged.

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Re: Dust disks detected Herschel's

Post by Borislav on 21st May 2010, 4:49 am

Thank you.

http://arxiv.org/abs/1005.3543


The Vega Debris Disc: A view from Herschel
We present five band imaging of the Vega debris disc obtained using the Herschel Space Observatory. These data span a wavelength range of 70-500 um with full-width half-maximum angular resolutions of 5.6-36.9". The disc is well resolved in all bands, with the ring structure visible at 70 and 160 um. Radial profiles of the disc surface brightness are produced, and a disc radius of 11" (~ 85 AU) is determined. The disc is seen to have a smooth structure thoughout the entire wavelength range, suggesting that the disc is in a steady state, rather than being an ephemeral structure caused by the recent collision of two large planetesimals.

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Re: Dust disks detected Herschel's

Post by Sirius_Alpha on 16th July 2010, 9:52 am



Last edited by Sirius_Alpha on 16th July 2010, 10:52 am; edited 2 times in total (Reason for editing : Fixed a link.)

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Re: Dust disks detected Herschel's

Post by marasama on 16th July 2010, 10:11 am

•“TNOs are Cool”: A survey of the trans-Neptunian region. I. Results from the Herschel science demonstration phase (SDP)
The link links back to the forum, not to a website.

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Re: Dust disks detected Herschel's

Post by Sirius_Alpha on 16th July 2010, 10:52 am

Thanks! I've corrected it.

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Re: Dust disks detected Herschel's

Post by Borislav on 28th November 2010, 6:59 am


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Re: Dust disks detected Herschel's

Post by Lazarus on 28th November 2010, 7:47 am

So there's an inferred planet shaping the dust disc at ζ˛ Ret? Nice...
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Re: Dust disks detected Herschel's

Post by Led_Zep on 11th April 2012, 2:21 pm

"HERSCHEL images extrasolar analogue of the Kuiper belt"

http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=50252

It's about Fomalhaut !

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Re: Dust disks detected Herschel's

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