A dataset provided by the European Space Agency

Name OT2_dfedele_2
Title Direct measurements of the warm gas distribution and vertical temperature gradient in protoplanetary disks.


DOI https://doi.org/10.5270/esa-fpl980w
Author European Space Agency
Description Recent observations of protoplanetary disks with Herschel have revealed the presence
of high-J CO lines. State-of-the-art disk models predicts that this emission arises
from intermediate layers below the disk surface and above the mid-plane. These
layers are shielded from the photodissociative (UV) radiation emitted by the
pre-main-sequence star and are thus very important for the chemical evolution of the
disk. Previous observations with PACS allows us to determine the temperature and density
of the gas in these layers. The low-resolution spectra of PACS, however, does not provide
direct information on the distribution of the gas. We propose follow-up observations with
HIFI of the J=16-15 CO line previously detected with PACS in 8 disks. The high-spectral
resolution of HIFI will allow us to directly measure the radial distribution of the
emitting gas. This modest (14 hours) HIFI proposal will complement the previous PACS
observations allowing to fully characterize the properties of the warm gas (temperature,
density and radial distribution).
The second goal of this project is to address the vertical temperature gradient inside
the disk. This will be achieved by comparing the HIFI observation of CO J=16-15 line to
spectrally-resolved ro-vibrational and low-J CO emission lines observed from the ground.
For this we will implement thermo-chemical disk models developed in our group.
We also propose follow-up HIFI observations of the strong [CII] emission detected with
PACS in three protoplanetary disks. According to disk models this line is expected to
emerge from the ionised disk surface of the disk and is linked to the CO chemistry
(photodissociation). However, the measured line flux in HD 100546, HD 97048 and IRS 48
is high and might not all come from the disk but rather from an outflow or a remnant
envelope. HIFI will allow to resol...ve to resolve the velocity profile of the line and in
turn to disentangle its origin.
Publication Probing the 2D temperature structure of protoplanetary disks with Herschel observations of high-J CO lines . Fedele D. et al. . Astronomy & Astrophysics, Volume 591, id.A95, 13 pp. . 591 . 10.1051\/0004-6361\/201526948 . 2016A&A...591A..95F ,
Probing the Radial Temperature Structure of Protoplanetary Disks with Herschel/HIFI . Fedele D. et al. . The Astrophysical Journal Letters, Volume 776, Issue 1, article id. L3, 5 pp. (2013). . 776 . 10.1088\/2041-8205\/776\/1\/L3 . 2013ApJ...776L...3F ,
Instrument HIFI_HifiPoint_dbs, HIFI_HifiPoint_load
Temporal Coverage 2012-06-29T01:06:41Z/2012-10-13T05:08:18Z
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 2013-04-13T04:07:24Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013, Direct Measurements Of The Warm Gas Distribution And Vertical Temperature Gradient In Protoplanetary Disks., SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-fpl980w