A dataset provided by the European Space Agency

Name OT2_amoor_3
Title The origin of gas in the two oldest, newly discovered gaseous debris disks.
URL

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http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342250869&instrument_name=PACS&product_level=LEVEL0&compress=true

DOI 10.5270/esa-z3ktrng
Author moor, a.
Description Many young main-sequence stars are surrounded by dusty debris disks, but only very few of them have a detectable gas component. In our APEX survey we discovered two new debris disks containing a substantial amount of molecular CO gas. One of them, the 30 million-year-old HD 21997, is the oldest known gaseous debris disk, making it the best candidate for containing CO gas of secondary origin, produced by sublimation of planetesimals, photodesorption from dust grains, or vaporization of colliding dust particles. We suggest that our discoveries together with the already known objects beta Pic and 49 Ceti form a distinguished group of debris systems that may represent the first stage of gas evolution after the primordial phase. Here we propose new Herschel observations to deduce the physical properties and the origin of gas in our targets, and study the possible physical processes of gas production in the secondary origin scenario. Our immediate objectives are the following: 1) Detection of [O I] 63um and [C II] 158um lines in our targets; 2) physical characterization of the gas-dust disk components; 3) establish the origin of gas and 4) comparison with beta Pic and 49 Ceti, and studying evolutionary aspects. The observation of atomic emission lines in such disks will provide a valuable information on the composition of the released gas and thus on similarity of the volatile composition of Solar System comets to exosolar planetesimals, potentially playing key role in the delivery of volatiles to exoplanets. The study request 9.2h observing time.
Publication Herschel-PACS observations of far-IR lines in young stellar objects. I. [OI] and H2O at 63 μm . Riviere-Marichalar P. et al. . Astronomy & Astrophysics, Volume 594, id.A59, 25 pp. . 594 . 10.1051\/0004-6361\/201527829 . 2016A&A...594A..59R ,
Instrument PACS_PacsPhoto_largeScan, SPIRE_SpirePhoto_small, PACS_PacsLineSpec_large
Temporal Coverage 2012-07-06T10:06:25Z/2012-09-11T03:53:47Z
Version SPG v14.2.0
Mission Description Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/herschel/
Date Published 2013-03-11T03:49:11Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-03-11T03:49:11Z, OT2_amoor_3, SPG v14.2.0. https://doi.org/10.5270/esa-z3ktrng