Molecules with ALMA at Planet-forming Scales (MAPS). X. Studying Deuteration at High Angular Resolution toward Protoplanetary Disks - Archive ouverte HAL Access content directly
Journal Articles The Astrophysical Journal Supplement Series Year : 2021

Molecules with ALMA at Planet-forming Scales (MAPS). X. Studying Deuteration at High Angular Resolution toward Protoplanetary Disks

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Gianni Cataldi
  • Function : Author
Yoshihide Yamato
  • Function : Author
Yuri Aikawa
Jennifer B. Bergner
  • Function : Author
Kenji Furuya
  • Function : Author
Viviana V. Guzmán
  • Function : Author
Jane Huang
  • Function : Author
Ryan A. Loomis
  • Function : Author
Chunhua Qi
Sean M. Andrews
  • Function : Author
Edwin A. Bergin
  • Function : Author
Alice S. Booth
  • Function : Author
Arthur D. Bosman
  • Function : Author
L. Ilsedore Cleeves
  • Function : Author
Ian Czekala
  • Function : Author
John D. Ilee
  • Function : Author
Charles J. Law
  • Function : Author
Yao Liu
  • Function : Author
Feng Long
  • Function : Author
Hideko Nomura
Karin I. Öberg
  • Function : Author
Kamber R. Schwarz
  • Function : Author
Richard Teague
Takashi Tsukagoshi
Catherine Walsh
  • Function : Author
David J. Wilner
  • Function : Author
Ke Zhang
  • Function : Author

Abstract

Deuterium fractionation is dependent on various physical and chemical parameters. Thus, the formation location and thermal history of material in the solar system is often studied by measuring its D/H ratio. This requires knowledge about the deuteration processes operating during the planet formation era. We aim to study these processes by radially resolving the DCN/HCN (at 0"3 resolution) and N2D+/N2H+ (~0"3-0"9) column density ratios toward the five protoplanetary disks observed by the Molecules with ALMA at Planet-forming scales (MAPS) Large Program. DCN is detected in all five sources, with one newly reported detection. N2D+ is detected in four sources, two of which are newly reported detections. We derive column density profiles that allow us to study the spatial variation of the DCN/HCN and N2D+/N2H+ ratios at high resolution. DCN/HCN varies considerably for different parts of the disks, ranging from 10-3 to 10-1. In particular, the inner-disk regions generally show significantly lower HCN deuteration compared with the outer disk. In addition, our analysis confirms that two deuterium fractionation channels are active, which can alter the D/H ratio within the pool of organic molecules. N2D+ is found in the cold outer regions beyond ~50 au, with N2D+/N2H+ ranging between 10-2 and 1 across the disk sample. This is consistent with the theoretical expectation that N2H+ deuteration proceeds via the low-temperature channel only. This paper is part of the MAPS special issue of the Astrophysical Journal Supplement.

Dates and versions

insu-03672370 , version 1 (19-05-2022)

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Cite

Gianni Cataldi, Yoshihide Yamato, Yuri Aikawa, Jennifer B. Bergner, Kenji Furuya, et al.. Molecules with ALMA at Planet-forming Scales (MAPS). X. Studying Deuteration at High Angular Resolution toward Protoplanetary Disks. The Astrophysical Journal Supplement Series, 2021, 257, ⟨10.3847/1538-4365/ac143d⟩. ⟨insu-03672370⟩
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