CONSTRAINTS ON THE PRESENCE OF SiO GAS IN THE DEBRIS DISK OF HD 172555

ABSTRACT We have carried out two sets of observations to quantify the properties of SiO gas in the unusual HD 172555 debris disk: (1) a search for the J = 8-7 rotational transition from the vibrational ground state, carried out with the Atacama Pathfinder EXperiment (APEX) submillimeter telescope an...

Full description

Saved in:
Bibliographic Details
Published in:The Astrophysical journal 2016-08, Vol.826 (2), p.165-165
Main Authors: Wilson, T. L., Nilsson, R., Chen, C. H., Lisse, C. M., Moerchen, M., Käufl, H.-U., Banzatti, A.
Format: Article
Language:English
Subjects:
ABUNDANCE
Apexes
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
circumstellar matter
COSMIC GASES
Debris
DETECTION
Disks
EMISSION
EXCITATION
Gas phases
GROUND STATES
HETERODYNE RECEIVERS
LINE WIDTHS
PHOTOLYSIS
Photosphere
RADIAL VELOCITY
RESOLUTION
Searching
SELF-SHIELDING
Silicon dioxide
SILICON OXIDES
SPECTRA
STABILITY
STARS
stars: individual (HD 172555)
submillimeter: planetary systems
techniques: spectroscopic
TELESCOPES
ULTRAVIOLET RADIATION
Very Large Telescope
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:ABSTRACT We have carried out two sets of observations to quantify the properties of SiO gas in the unusual HD 172555 debris disk: (1) a search for the J = 8-7 rotational transition from the vibrational ground state, carried out with the Atacama Pathfinder EXperiment (APEX) submillimeter telescope and heterodyne receiver at 863 m and (2) a search at 8.3 m for the P(17) ro-vibrational transition of gas phase SiO, carried out with the Very Large Telescope (VLT)/VISIR with a resolution, λ/Δλ, of 30,000. The APEX measurement resulted in a 3.3 detection of an interstellar feature, but only an upper limit to emission at the radial velocity and line width expected from HD 172555. The VLT/VISIR result was also an upper limit. These were used to provide limits for the abundance of gas phase SiO for a range of temperatures. The upper limit from our APEX detection, assuming an 8000 K primary star photospheric excitation, falls more than an order of magnitude below the self-shielding stability threshold derived by Johnson et al. (2012). Our results thus favor a solid-state origin for the 8.3 m feature seen in the Spitzer IRS spectrum of the circumstellar excess emission and the production of circumstellar O i and Si i by SiO UV photolysis. The implications of these estimates are explored in the framework of models of the HD 172555 circumstellar disk.
ISSN:0004-637X
1538-4357
1538-4357
DOI:10.3847/0004-637X/826/2/165