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


DOI https://doi.org/10.5270/esa-leau30c
Author European Space Agency
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.
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 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/h®erschel/
Date Published 2013-03-26T21:57:09Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013, Low Gas To Dust Ratio In Protoplanetary Disks: The Carbon Content Of Cq Tau Comma Mwc 758 And Mwc 480, SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-leau30c