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/20.500.12386/27370
Title: Decrease of the organic deuteration during the evolution of Sun-like protostars: the case of SVS13-A
Authors: Bianchi, E.
CODELLA, CLAUDIO 
Ceccarelli, C.
FONTANI, FRANCESCO 
Testi, L. 
Bachiller, R.
Lefloch, B.
PODIO, LINDA 
Taquet, V.
Issue Date: 2017
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 467
Issue: 3
First Page: 3011
Abstract: We present the results of formaldehyde and methanol deuteration measurements towards the Class I low-mass protostar SVS13-A in the framework of the IRAM 30-m ASAI (Astrochemical Surveys at IRAM) project. We detected emission lines of formaldehyde, methanol and their deuterated forms (HDCO, D<SUB>2</SUB>CO, CHD<SUB>2</SUB>OH, CH<SUB>3</SUB>OD) with E<SUB>up</SUB> up to 276 K. The formaldehyde analysis indicates T<SUB>kin</SUB> ∼ 15-30 K, n_H_2 \ge 10<SUP>6</SUP> cm<SUP>-3</SUP> and a size of about 1200 au suggesting an origin in the protostellar envelope. For methanol, we find two components: (I) a high temperature (T<SUB>kin</SUB> ∼ 80 K) and very dense (>10<SUP>8</SUP> cm<SUP>-3</SUP>) gas from a hot corino (radius ≃ 35 au), and (II) a colder (T<SUB>kin</SUB> ≤ 70 K) and more extended (radius ≃ 350 au) region. The deuterium fractionation is 9 × 10<SUP>-2</SUP> for HDCO, 4 × 10<SUP>-3</SUP> for D<SUB>2</SUB>CO and 2-7 × 10<SUP>-3</SUP> for CH<SUB>2</SUB>DOH, up to two orders of magnitude lower than the values measured in Class 0 sources. We also derive formaldehyde deuteration in the outflow: 4 × 10<SUP>-3</SUP>, in agreement with what found in the L1157-B1 protostellar shock. Finally, we estimate [CH<SUB>2</SUB>DOH]/[CH<SUB>3</SUB>OD] ≃ 2. The decrease of deuteration in the Class I source SVS13-A with respect to Class 0 sources can be explained by gas-phase processes. Alternatively, a lower deuteration could be the effect of a gradual collapse of less deuterated external shells of the protostellar envelope. The present measurements fill in the gap between pre-stellar cores and protoplanetary discs in the context of organic deuteration measurements.
URI: http://hdl.handle.net/20.500.12386/27370
URL: https://academic.oup.com/mnras/article/467/3/3011/2978035
ISSN: 0035-8711
DOI: 10.1093/mnras/stx252
Bibcode ADS: 2017MNRAS.467.3011B
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

Files in This Item:
File Description SizeFormat 
stx252.pdfPDF editoriale985.02 kBAdobe PDFView/Open
1701.08656.pdfpostprint351.31 kBAdobe PDFView/Open
Show full item record

Page view(s)

17
checked on Jan 26, 2021

Download(s)

12
checked on Jan 26, 2021

Google ScholarTM

Check

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