Skip navigation
  • INAF logo
  • Home
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects
  • Explore by
    • Research outputs
    • Researchers
    • Organization units
    • Projects
  • Login:
    • My DSpace
    • Receive email
      updates
    • Edit Account details
  • Italian
  • English

  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/31251
Title: ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT). II. Vertical stratification of CO, CS, CN, H2CO, and CH3OH in a Class I disk
Authors: PODIO, LINDA 
GARUFI, ANTONIO 
CODELLA, CLAUDIO 
FEDELE , DAVIDE 
Bianchi, E.
BACCIOTTI, Francesca 
Ceccarelli, C.
Favre, C.
Mercimek, S.
RYGL, Kazi Lucie Jessica 
TESTI, Leonardo 
Issue Date: 2020
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 642
First Page: L7
Abstract: The chemical composition of planets is inherited from that of the natal protoplanetary disk at the time of planet formation. Increasing observational evidence suggests that planet formation occurs in less than 1-2 Myr. This motivates the need for spatially resolved spectral observations of young Class I disks, as carried out by the ALMA chemical survey of Disk-Outflow sources in Taurus (ALMA-DOT). In the context of ALMA-DOT, we observe the edge-on disk around the Class I source IRAS 04302+2247 (the butterfly star) in the 1.3 mm continuum and five molecular lines. We report the first tentative detection of methanol (CH<SUB>3</SUB>OH) in a Class I disk and resolve, for the first time, the vertical structure of a disk with multiple molecular tracers. The bulk of the emission in the CO 2-1, CS 5-4, and o-H<SUB>2</SUB>CO 3<SUB>1, 2</SUB> - 2<SUB>1, 1</SUB> lines originates from the warm molecular layer, with the line intensity peaking at increasing disk heights, z, for increasing radial distances, r. Molecular emission is vertically stratified, with CO observed at larger disk heights (aperture z/r ∼ 0.41-0.45) compared to both CS and H<SUB>2</SUB>CO, which are nearly cospatial (z/r ∼ 0.21-0.28). In the outer midplane, the line emission decreases due to molecular freeze-out onto dust grains (freeze-out layer) by a factor of > 100 (CO) and 15 (CS). The H<SUB>2</SUB>CO emission decreases by a factor of only about 2, which is possibly due to H<SUB>2</SUB>CO formation on icy grains, followed by a nonthermal release into the gas phase. The inferred [CH<SUB>3</SUB>OH]/[H<SUB>2</SUB>CO] abundance ratio is 0.5-0.6, which is 1-2 orders of magnitude lower than for Class 0 hot corinos, and a factor ∼2.5 lower than the only other value inferred for a protoplanetary disk (in TW Hya, 1.3-1.7). Additionally, it is at the lower edge but still consistent with the values in comets. This may indicate that some chemical reprocessing occurs in disks before the formation of planets and comets. <P />The reduced images and datacubes are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr/">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/642/L7">http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/642/L7</A>
URI: http://hdl.handle.net/20.500.12386/31251
URL: https://www.aanda.org/articles/aa/full_html/2020/10/aa38952-20/aa38952-20.html
http://arxiv.org/abs/2008.12648v2
ISSN: 0004-6361
DOI: 10.1051/0004-6361/202038952
Bibcode ADS: 2020A&A...642L...7P
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

Files in This Item:
File Description SizeFormat
podio_2020a_postprint.pdfpostprint2.37 MBAdobe PDFView/Open
podio_2020a_editorial.pdfPDF editoriale2.33 MBAdobe PDFView/Open
Show full item record

Page view(s)

22
checked on Aug 13, 2022

Download(s)

7
checked on Aug 13, 2022

Google ScholarTM

Check

Altmetric

Altmetric


Items in DSpace are published in Open Access, unless otherwise indicated.


Explore by
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects

Informazioni e guide per autori

https://openaccess-info.inaf.it: tutte le informazioni sull'accesso aperto in INAF

Come si inserisce un prodotto: le guide a OA@INAF

La Policy INAF sull'accesso aperto

Documenti e modelli scaricabili

Feedback
Built with DSpace-CRIS - Extension maintained and optimized by Logo 4SCIENCE