Molecules with ALMA at Planet-forming Scales (MAPS). IX. Distribution and Properties of the Large Organic Molecules HC<SUB>3</SUB>N, CH<SUB>3</SUB>CN, and c-C<SUB>3</SUB>H<SUB>2</SUB> - Archive ouverte HAL Access content directly
Journal Articles The Astrophysical Journal Supplement Series Year : 2021

Molecules with ALMA at Planet-forming Scales (MAPS). IX. Distribution and Properties of the Large Organic Molecules HC3N, CH3CN, and c-C3H2

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1
John D. Ilee
  • Function : Author
Catherine Walsh
  • Function : Author
Alice S. Booth
  • Function : Author
Yuri Aikawa
Sean M. Andrews
  • Function : Author
Jaehan Bae
Edwin A. Bergin
  • Function : Author
Jennifer B. Bergner
  • Function : Author
Arthur D. Bosman
  • Function : Author
Gianni Cataldi
  • Function : Author
L. Ilsedore Cleeves
  • Function : Author
Ian Czekala
  • Function : Author
Viviana V. Guzmán
  • Function : Author
Jane Huang
  • Function : Author
Charles J. Law
  • Function : Author
Ryan A. Loomis
  • Function : Author
Hideko Nomura
Karin I. Öberg
  • Function : Author
Chunhua Qi
Kamber R. Schwarz
  • Function : Author
Richard Teague
Takashi Tsukagoshi
David J. Wilner
  • Function : Author
Yoshihide Yamato
  • Function : Author
Ke Zhang
  • Function : Author

Abstract

The precursors to larger, biologically relevant molecules are detected throughout interstellar space, but determining the presence and properties of these molecules during planet formation requires observations of protoplanetary disks at high angular resolution and sensitivity. Here, we present 0"3 observations of HC3N, CH3CN, and c-C3H2 in five protoplanetary disks observed as part of the Molecules with ALMA at Planet-forming Scales (MAPS) Large Program. We robustly detect all molecules in four of the disks (GM Aur, AS 209, HD 163296, and MWC 480) with tentative detections of c-C3H2 and CH3CN in IM Lup. We observe a range of morphologies-central peaks, single or double rings-with no clear correlation in morphology between molecule or disk. Emission is generally compact and on scales comparable with the millimeter dust continuum. We perform both disk-integrated and radially resolved rotational diagram analysis to derive column densities and rotational temperatures. The latter reveals 5-10 times more column density in the inner 50-100 au of the disks when compared with the disk-integrated analysis. We demonstrate that CH3CN originates from lower relative heights in the disks when compared with HC3N, in some cases directly tracing the disk midplane. Finally, we find good agreement between the ratio of small to large nitriles in the outer disks and comets. Our results indicate that the protoplanetary disks studied here are host to significant reservoirs of large organic molecules, and that this planet- and comet-building material can be chemically similar to that in our own solar system. This paper is part of the MAPS special issue of the Astrophysical Journal Supplement.

Dates and versions

insu-03672372 , version 1 (19-05-2022)

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John D. Ilee, Catherine Walsh, Alice S. Booth, Yuri Aikawa, Sean M. Andrews, et al.. Molecules with ALMA at Planet-forming Scales (MAPS). IX. Distribution and Properties of the Large Organic Molecules HC3N, CH3CN, and c-C3H2. The Astrophysical Journal Supplement Series, 2021, 257, ⟨10.3847/1538-4365/ac1441⟩. ⟨insu-03672372⟩
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