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> - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue The Astrophysical Journal Supplement Series Année : 2021

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

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

Résumé

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 et versions

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

Identifiants

Citer

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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