A dataset provided by the European Space Agency

Name OT2_echapill_2
Title Low gas to dust ratio in protoplanetary disks: the Carbon content of CQ Tau, MWC 758 and MWC 480
URL

http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342250421&instrument_name=HIFI&product_level=LEVEL0&compress=true
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DOI 10.5270/esa-leau30c
Author chapillon, e.
Description The study of the transition from gasrich protoplanetary disk to gaspoor debris disk is crucial to constrain the planetary formation mechanisms. Although it is a key parameter for big gaseous planet formation, the evolution of the gastodust ratio with time and star properties is not yet known. One of the first steps to observationally constrain it is to determine independently the gas mass and the dust mass of disks. The dust content, determined from continuum emission, is better known than the gas content. As molecular hydrogen is not observable at the low temperatures of disks, the gas mass is usually derived from CO observation. However, CO may not be always the main carbon reservoir: it should freeze on grain mantles in the cold midplane of T Tauri disks, and be photodissociated in the upper layers by the UV field, leading to CI and CII, especially in disks surrounding A stars. We propose here to characterize the gaseous Carbon content in three disks (CQ Tau, MWC 758 and MWC 480) using the three main C carriers: CO, CI and C+. Previous CO observations indicates warm disks (the temperature being well above the CO freezeout temperature). Two of them, CQ Tau and MWC 758, have very low CO content and may be in the transition stage between gasrich and gas poor disks. A low CI content was also found for CQ Tau using APEX. We propose to take advantage of sensitivity of Hershel at 1900 GHz (157 um) and high spectral resolution provided by the HIFI instrument to observe C+ in these disks. This proposal was ranked B for the OT1 period. We resubmit an updated version.
Publication
Instrument HIFI_HifiPoint_load
Temporal Coverage 2012-08-29T10:05:51Z/2012-09-26T22:14:52Z
Version SPG v14.1.0
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 ┬Ám range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/herschel/
Date Published 2013-03-26T21:57:09Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-03-26T21:57:09Z, OT2_echapill_2, SPG v14.1.0. https://doi.org/10.5270/esa-leau30c