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Constraints on the ...
Constraints on the gas content of the Fomalhaut debris belt Can gas-dust interactions explain the belt's morphology?
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- Cataldi, Gianni (författare)
- Stockholms universitet,Institutionen för astronomi
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- Brandeker, Alexis (författare)
- Stockholms universitet,Institutionen för astronomi
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- Olofsson, Göran (författare)
- Stockholms universitet,Institutionen för astronomi
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Chen, C. H. (författare)
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Dent, W. R. F. (författare)
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Kamp, I. (författare)
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Roberge, A. (författare)
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Vandenbussche, B. (författare)
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(creator_code:org_t)
- 2015-01-15
- 2015
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 574
- Relaterad länk:
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https://www.aanda.or...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Context. The 440 Myr old main-sequence A-star Fomalhaut is surrounded by an eccentric debris belt with sharp edges. This sort of a morphology is usually attributed to planetary perturbations, but the orbit of the only planetary candidate detected so far, Fomalhaut b, is too eccentric to efficiently shape the belt. Alternative models that could account for the morphology without invoking a planet are stellar encounters and gas-dust interactions. Aims. We aim to test the possibility of gas-dust interactions as the origin of the observed morphology by putting upper limits on the total gas content of the Fomalhaut belt. Methods. We derive upper limits on the CII 158 mu m and 01 63 pint emission by using non detections from the Photocletector Array Camera and Spectrometer (PACS) onboard the Herschel Space Observatory. Line fluxes are converted into total gas mass using the non-local thermodynamic equilibrium (non-LTE) code RADEX. We consider two different cases for the elemental abundances of the gas: solar abundances and abundances similar to those observed for the gas in the beta Pictoris debris disc. Results. The gas mass is shown to be below the millimetre dust mass by a factor of at least similar to 3 (for solar abundances) respectively similar to 300 (for beta Pic-like abundances). Conclusions. The lack of gas co-spatial with the dust implies that gas-dust interactions cannot efficiently shape the Fomalhaut debris belt. The morphology is therefore more likely due to a yet unseen planet (Fomalhaut c) or stellar encounters.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- circumstellar matter
- planetary systems
- stars: individual: Fomalhaut
- methods: observational
- hydrodynamics
- infrared: general
- Astronomy
- astronomi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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