(WFRF:(Pilbratt G.)) pers:(Eiroa C.)
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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 06189naa a2200781 4500 | |
| 001 | oai:research.chalmers.se:4a06046d-2a52-418e-9921-0e44334ce20a | |
| 003 | SwePub | |
| 008 | 171007s2012 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://doi.org/10.1051/0004-6361/2011180772 DOI |
| 024 | 7 | a https://research.chalmers.se/publication/1598862 URI |
| 040 | a (SwePub)cth | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a art2 swepub-publicationtype |
| 072 | 7 | a ref2 swepub-contenttype |
| 100 | 1 | a Ertel, S.u Université Grenoble Alpes,Grenoble Alpes University,Christian-Albrechts-Universität zu Kiel,University of Kiel4 aut |
| 245 | 1 0 | a A peculiar class of debris disks from Herschel/DUNES - A steep fall off in the far infrared |
| 264 | c 2012-05-22 | |
| 264 | 1 | b EDP Sciences,c 2012 |
| 338 | a electronic2 rdacarrier | |
| 520 | a Context. The existence of debris disks around old main sequence stars is usually explained by continuous replenishment of small dust grains through collisions from a reservoir of larger objects. Aims. We present photometric data of debris disks around HIP 103389 (HD199260), HIP 107350 (HNPeg, HD206860), and HIP 114948 (HD219482), obtained in the context of our Herschel open time key program DUNES (DUst around NEarby Stars). Methods. We used Herschel/PACS to detect the thermal emission of the three debris disks with a 3 sigma sensitivity of a few mJy at 100 mu m and 160 mu m. In addition, we obtained Herschel/PACS photometric data at 70 mu m for HIP 103389. These observations are complemented by a large variety of optical to far-infrared photometric data. Two different approaches are applied to reduce the Herschel data to investigate the impact of data reduction on the photometry. We fit analytical models to the available spectral energy distribution (SED) data using the fitting method of simulated thermal annealing as well as a classical grid search method. Results. The SEDs of the three disks potentially exhibit an unusually steep decrease at wavelengths >= 70 mu m. We investigate the significance of the peculiar shape of these SEDs and the impact on models of the disks provided it is real. Using grain compositions that have been applied successfully for modeling of many other debris disks, our modeling reveals that such a steep decrease of the SEDs in the long wavelength regime is inconsistent with a power-law exponent of the grain size distribution -3.5 expected from a standard equilibrium collisional cascade. In contrast, a steep grain size distribution or, alternatively an upper grain size in the range of few tens of micrometers are implied. This suggests that a very distinct range of grain sizes would dominate the thermal emission of such disks. However, we demonstrate that the understanding of the data of faint sources obtained with Herschel is still incomplete and that the significance of our results depends on the version of the data reduction pipeline used. Conclusions. A new mechanism to produce the dust in the presented debris disks, deviations from the conditions required for a standard equilibrium collisional cascade (grain size exponent of -3.5), and/or significantly different dust properties would be necessary to explain the potentially steep SED shape of the three debris disks presented. | |
| 650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
| 653 | a main-sequence stars | |
| 653 | a bolometric corrections | |
| 653 | a stars | |
| 653 | a solar neighborhood | |
| 653 | a circumstellar matter | |
| 653 | a nearby | |
| 653 | a dust | |
| 653 | a effective | |
| 653 | a spitzer | |
| 653 | a infrared: planetary systems | |
| 653 | a circumstellar disk | |
| 653 | a stars: individual: HIP | |
| 653 | a temperatures | |
| 653 | a geneva-copenhagen survey | |
| 653 | a sun-like stars | |
| 653 | a stars: individual: HIP 103389 | |
| 700 | 1 | a Wolf, S.u Christian-Albrechts-Universität zu Kiel,University of Kiel4 aut |
| 700 | 1 | a Marshall, J. P.u Universidad Autonoma de Madrid (UAM)4 aut |
| 700 | 1 | a Eiroa, C.u Universidad Autonoma de Madrid (UAM)4 aut |
| 700 | 1 | a Augereau, J. C.u Université Grenoble Alpes,Grenoble Alpes University4 aut |
| 700 | 1 | a Krivov, A.u Friedrich-Schiller-Universität Jena,Friedrich Schiller University Jena4 aut |
| 700 | 1 | a Lohne, T.u Friedrich-Schiller-Universität Jena,Friedrich Schiller University Jena4 aut |
| 700 | 1 | a Absil, O.u Universite de Liège,University of Liège4 aut |
| 700 | 1 | a Ardila, D. R.u California Institute of Technology (Caltech)4 aut |
| 700 | 1 | a Arevalo, M.u European Space Astronomy Centre (ESAC)4 aut |
| 700 | 1 | a Bayo, A.4 aut |
| 700 | 1 | a Bryden, G.4 aut |
| 700 | 1 | a del Burgo, C.4 aut |
| 700 | 1 | a Greaves, J. S.u University of St Andrews4 aut |
| 700 | 1 | a Kennedy, G.u University Of Cambridge4 aut |
| 700 | 1 | a Lebreton, J.u Université Grenoble Alpes,Grenoble Alpes University4 aut |
| 700 | 1 | a Liseau, René,d 1949u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)liseau |
| 700 | 1 | a Maldonado, J.u Universidad Autonoma de Madrid (UAM)4 aut |
| 700 | 1 | a Montesinos, B.4 aut |
| 700 | 1 | a Mora, A.u European Space Astronomy Centre (ESAC)4 aut |
| 700 | 1 | a Pilbratt, G.L.u European Space Research and Technology Centre (ESA ESTEC)4 aut |
| 700 | 1 | a Sanz-Forcada, J.4 aut |
| 700 | 1 | a Stapelfeldt, K. R.u NASA Goddard Space Flight Center4 aut |
| 700 | 1 | a White, G. J.u Open University,STFC Rutherford Appleton Laboratory4 aut |
| 710 | 2 | a Université Grenoble Alpesb Christian-Albrechts-Universität zu Kiel4 org |
| 773 | 0 | t Astronomy and Astrophysicsd : EDP Sciencesg 541q 541x 0004-6361x 1432-0746 |
| 856 | 4 | u http://publications.lib.chalmers.se/records/fulltext/local_159886.pdfx primaryx freey FULLTEXT |
| 856 | 4 | u https://www.aanda.org/articles/aa/pdf/2012/05/aa18077-11.pdf |
| 856 | 4 8 | u https://doi.org/10.1051/0004-6361/201118077 |
| 856 | 4 8 | u https://research.chalmers.se/publication/159886 |
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