Molecules with ALMA at Planet-forming Scales (MAPS). II. CLEAN Strategies for Synthesizing Images of Molecular Line Emission in Protoplanetary Disks - 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). II. CLEAN Strategies for Synthesizing Images of Molecular Line Emission in Protoplanetary Disks

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

Résumé

The Molecules with ALMA at Planet-forming Scales Large Program (MAPS LP) surveyed the chemical structures of five protoplanetary disks across more than 40 different spectral lines at high angular resolution (0"15 and 0"30 beams for Bands 6 and 3, respectively) and sensitivity (spanning 0.3-1.3 mJy beam-1 and 0.4-1.9 mJy beam-1 for Bands 6 and 3, respectively). In this article, we describe the multistage workflow-built around the CASA tclean image deconvolution procedure-that we used to generate the core data product of the MAPS LP: the position-position-velocity image cubes for each spectral line. Owing to the expansive nature of the survey, we encountered a range of imaging challenges: some are familiar to the submillimeter protoplanetary disk community, like the need to use an accurate CLEAN mask, and others are less well known, like the incorrect default flux scaling of the CLEAN residual map first described by Jorsater & van Moorsel (the "JvM effect"). We distill lessons learned into recommended workflows for synthesizing image cubes of molecular emission. In particular, we describe how to produce image cubes with accurate fluxes via "JvM correction," a procedure that is generally applicable to any image synthesized via CLEAN deconvolution but is especially critical for low signal-to-noise ratio (S/N) emission. We further explain how we used visibility tapering to promote a common, fiducial beam size and contextualize the interpretation of S/N when detecting molecular emission from protoplanetary disks. This paper is part of the MAPS special issue of the Astrophysical Journal Supplement.

Dates et versions

insu-03672379 , version 1 (19-05-2022)

Identifiants

Citer

Ian Czekala, Ryan A. Loomis, Richard Teague, Alice S. Booth, Jane Huang, et al.. Molecules with ALMA at Planet-forming Scales (MAPS). II. CLEAN Strategies for Synthesizing Images of Molecular Line Emission in Protoplanetary Disks. The Astrophysical Journal Supplement Series, 2021, 257, ⟨10.3847/1538-4365/ac1430⟩. ⟨insu-03672379⟩
22 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More