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HD 172555: Detection of 63 micrometers [OI] Emission in a Debris DiscContext. HD 172555 is a young A7 star belonging to the Beta Pictoris Moving Group that harbours a debris disc. The Spitzer IRS spectrum of the source showed mid-IR features such as silicates and glassy silica species, indicating the presence of a warm dust component with small grains, which places HD 172555 among the small group of debris discs with such properties. The IRS spectrum also shows a possible emission of SiO gas. Aims. We aim to study the dust distribution in the circumstellar disc of HD 172555 and to asses the presence of gas in the debris disc. Methods. As part of the GASPS Open Time Key Programme, we obtained Herschel-PACS photometric and spectroscopic observations of the source. We analysed PACS observations of HD 172555 and modelled the Spectral Energy Distribution (SED) with a modified blackbody and the gas emission with a two-level population model with no collisional de-excitation. Results. We report for the first time the detection of [OI] atomic gas emission at 63.18 micrometers in the HD 172555 circumstellar disc.We detect excesses due to circumstellar dust toward HD 172555 in the three photometric bands of PACS (70, 100, and 160 m). We derive a large dust particle mass of (4.8 plus-minus 0.6)x10(exp -4) Mass compared to Earth and an atomic oxygen mass of 2.5x10(exp -2)R(exp 2) Mass compared to Earth, where R in AU is the separation between the star and the inner disc. Thus, most of the detected mass of the disc is in the gaseous phase.
Document ID
20130013666
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
External Source(s)
http://arxiv.org/abs/1210.0089v1
Authors
Riviere-Marichalar, P. (European Space Astronomy Centre (ESAC) Villanueva de la Canada, Spain)
Barrado, D. (European Space Astronomy Centre (ESAC) Villanueva de la Canada, Spain)
Augereau, J. -C. (Grenoble-1 Univ. France)
Thi, W. F. (Grenoble-1 Univ. France)
Roberge, A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Eiroa, C. (Universidad Autonoma de Madrid Cantoblanco, Spain)
Montesinos, B. (European Space Astronomy Centre (ESAC) Villanueva de la Canada, Spain)
Meeus, G. (Universidad Autonoma de Madrid Cantoblanco, Spain)
Howard, C. (Universities Space Research Association Moffett Field, CA, United States)
Sandell, G. (Universities Space Research Association Moffett Field, CA, United States)
Duchene, G. (Grenoble-1 Univ. France)
Dent, W. R. F. (Altacama Large Millimeter Array Santiago)
Lebreton, J. (Grenoble-1 Univ. France)
Mendigutia, I. (European Space Astronomy Centre (ESAC) Villanueva de la Canada, Spain)
Huelamo, N. (European Space Astronomy Centre (ESAC) Villanueva de la Canada, Spain)
Menard, F. (Grenoble-1 Univ. France)
Pinte, C. (Grenoble-1 Univ. France)
Date Acquired
August 27, 2013
Publication Date
October 2, 2012
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN7210
Funding Number(s)
CONTRACT_GRANT: NAS2-97001
CONTRACT_GRANT: RYC- 2011-07920
CONTRACT_GRANT: ANR-2010 BLAN-0505-01
CONTRACT_GRANT: PRICIT-S2009/ESP-1496
CONTRACT_GRANT: AYA 2010-21161-C02-02
CONTRACT_GRANT: CDS2006-00070
CONTRACT_GRANT: EU 284405
CONTRACT_GRANT: AYA-2011-26202
Distribution Limits
Public
Copyright
Public Use Permitted.

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