English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  Probing UV-sensitive pathways for CN and HCN formation in protoplanetary disks with the Hubble Space Telescope

Arulanantham, N., France, K., Cazzoletti, P., Miotello, A., Manara, C. F., Schneider, P. C., et al. (2020). Probing UV-sensitive pathways for CN and HCN formation in protoplanetary disks with the Hubble Space Telescope. Astronomical Journal, 159(4): 168. doi:10.3847/1538-3881/ab789a.

Item is

Files

show Files
hide Files
:
Probing UV-sensitive pathways for CN and HCN formation in protoplanetary disks with the Hubble Space Telescope.pdf (Any fulltext), 2MB
 
File Permalink:
-
Name:
Probing UV-sensitive pathways for CN and HCN formation in protoplanetary disks with the Hubble Space Telescope.pdf
Description:
-
OA-Status:
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Arulanantham, Nicole, Author
France, Kevin, Author
Cazzoletti, Paolo1, Author           
Miotello, Anna, Author
Manara, Carlo F., Author
Schneider, P. Christian, Author
Hoadley, Keri, Author
van Dishoeck, Ewine F., Author
Arulanantham, Hans Moritz GüntherNicole, Author
France, Kevin, Author
Cazzoletti, Paolo, Author
Miotello, Anna, Author
Manara, Carlo F., Author
Schneider, P. Christian, Author
Hoadley, Keri, Author
Dishoeck, Ewine F. van1, Author           
Günther, Hans Moritz, Author
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

Content

show
hide
Free keywords: -
 Abstract: The UV radiation field is a critical regulator of gas-phase chemistry in surface layers of disks around young stars. In an effort to understand the relationship between photocatalyzing UV radiation fields and gas emission observed at infrared and submillimeter wavelengths, we present an analysis of new and archival Hubble Space Telescope (HST), Spitzer, ALMA, IRAM, and SMA data for five targets in the Lupus cloud complex and 14 systems in Taurus-Auriga. The HST spectra were used to measure Lyα and far-UV (FUV) continuum fluxes reaching the disk surface, which are responsible for dissociating relevant molecular species (e.g., HCN, N2). Semi-forbidden C ii] λ2325 and UV-fluorescent N2 emission were also measured to constrain inner disk populations of C+ and vibrationally excited N2. We find a significant positive correlation between 14 μm HCN emission and fluxes from the FUV continuum and C ii] λ2325, consistent with model predictions requiring N2 photodissociation and carbon ionization to trigger the main CN/HCN formation pathways. We also report significant negative correlations between submillimeter CN emission and both C ii] and FUV continuum fluxes, implying that CN is also more readily dissociated in disks with stronger FUV irradiation. No clear relationships are detected between either CN or HCN and Lyα or UV- N2 emission. This is attributed to the spatial stratification of the various molecular species, which span several vertical layers and radii across the inner and outer disk. We expect that future observations with the James Webb Space Telescope will build on this work by enabling more sensitive IR surveys than were possible with Spitzer.

Details

show
hide
Language(s): eng - English
 Dates: 2020-03-23
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.3847/1538-3881/ab789a
Other: LOCALID: 3252160
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Astronomical Journal
  Other : Astron. J.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Chicago : Published by the University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 159 (4) Sequence Number: 168 Start / End Page: - Identifier: ISSN: 0004-6256
CoNE: https://pure.mpg.de/cone/journals/resource/954922828207