English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  The central 1000 au of a prestellar core revealed with ALMA. II. Almost complete freeze-out

Caselli, P., Pineda, J. E., Sipilä, O., Zhao, B., Redaelli, E., Spezzano, S., et al. (2022). The central 1000 au of a prestellar core revealed with ALMA. II. Almost complete freeze-out. The Astrophysical Journal, 929(1): 13. doi:10.3847/1538-4357/ac5913.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files
hide Files
:
The central 1000 au of a prestellar core revealed with ALMA. II. Almost complete freeze-out.pdf (Any fulltext), 3MB
 
File Permalink:
-
Name:
The central 1000 au of a prestellar core revealed with ALMA. II. Almost complete freeze-out.pdf
Description:
-
OA-Status:
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Caselli, Paola1, Author           
Pineda, Jaime E.1, Author           
Sipilä, Olli1, Author           
Zhao, Bo1, Author           
Redaelli, Elena1, Author           
Spezzano, Silvia1, Author           
Maureira, María José1, Author           
Alves, Felipe O.1, Author           
Bizzocchi, Luca1, Author           
Bourke, Tyler L., Author
Chacón-Tanarro, Ana, Author
Friesen, Rachel, Author
Galli, Daniele, Author
Harju, Jorma1, Author           
Jiménez-Serra, Izaskun, Author
Keto, Eric, Author
Li, Zhi-Yun, Author
Padovani, Marco, Author
Schmiedeke, Anika1, Author           
Tafalla, Mario, Author
Vastel, Charlotte, Author more..
Affiliations:
1Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

Content

show
hide
Free keywords: -
 Abstract: Prestellar cores represent the initial conditions in the process of star and planet formation. Their low temperatures (<10 K) allow the formation of thick icy dust mantles, which will be partially preserved in future protoplanetary disks, ultimately affecting the chemical composition of planetary systems. Previous observations have shown that carbon- and oxygen-bearing species, in particular CO, are heavily depleted in prestellar cores due to the efficient molecular freeze-out onto the surface of cold dust grains. However, N-bearing species such as NH3 and, in particular, its deuterated isotopologues appear to maintain high abundances where CO molecules are mainly in the solid phase. Thanks to ALMA, we present here the first clear observational evidence of NH2D freeze-out toward the L1544 prestellar core, suggestive of the presence of a "complete depletion zone" within a ≃1800 au radius, in agreement with astrochemical prestellar core model predictions. Our state-of-the-art chemical model coupled with a non-LTE radiative transfer code demonstrates that NH2D becomes mainly incorporated in icy mantles in the central 2000 au and starts freezing out already at ≃7000 au. Radiative transfer effects within the prestellar core cause the NH2D(111 − 101) emission to appear centrally concentrated, with a flattened distribution within the central ≃3000 au, unlike the 1.3 mm dust continuum emission, which shows a clear peak within the central ≃1800 au. This prevented NH2D freeze-out from being detected in previous observations, where the central 1000 au cannot be spatially resolved.

Details

show
hide
Language(s):
 Dates: 2022-04-08
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.3847/1538-4357/ac5913
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: The Astrophysical Journal
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 929 (1) Sequence Number: 13 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3