TY - JOUR
T1 - CLIcK
T2 - A Continuum and Line fitting Kit for circumstellar disks
AU - Liu, Yao
AU - Pascucci, Ilaria
AU - Henning, Thomas
N1 - Funding Information:
We thank the anonymous referee for the very constructive comments that improved the manuscript. YL acknowledges support from the Natural Science Foundation of China (Grant No. 11503087) and from the Natural Science Foundation of Jiangsu Province of China (Grant No. BK20181513). We thank John S. Carr for providing the reduced Spitzer/IRS spectrum of AATau and Klaus Pontoppidan for help with the RADLite code. We acknowledge Ewine F. van Dishoeck for insightful discussions. This material is based upon work supported by the National Aeronautics and Space Administration under Agreement No. NNX15AD94G for the program "Earths in Other Solar Systems". The results reported herein benefited from collaborations and/or information exchange within NASA's Nexus for Exoplanet System Science (NExSS) research coordination network sponsored by NASA's Science Mission Directorate.
Publisher Copyright:
© ESO 2019.
PY - 2019/3/1
Y1 - 2019/3/1
N2 - Infrared spectroscopy with medium to high spectral resolution is essential to characterize the gas content of circumstellar disks. Unfortunately, conducting continuum and line radiative transfer of thermochemical disk models is too time-consuming to carry out large parameter studies. Simpler approaches using a slab model to fit continuum-subtracted spectra require the identification of either the global or local continuum. Continuum subtraction, particularly when covering a broad wavelength range, is challenging but critical in rich molecular spectra as hot (several hundreds K) molecular emission lines can also produce a pseudo continuum. In this work, we present CLIcK, a flexible tool to simultaneously fit the continuum and line emission. The continuum model presented by Dullemond, Dominik, and Natta, and a plane-parallel slab of gas in local thermodynamic equilibrium are adopted to simulate the continuum and line emission, respectively, both of them are fast enough for homogeneous studies of large disk samples. We applied CLIcK to fit the observed water spectrum of the AA Tau disk and obtained water vapor properties that are consistent with literature results. We also demonstrate that CLIcK properly retrieves the input parameters used to simulate the water spectrum of a circumstellar disk. CLIcK will be a versatile tool for the interpretation of future James Webb Space Telescope spectra.
AB - Infrared spectroscopy with medium to high spectral resolution is essential to characterize the gas content of circumstellar disks. Unfortunately, conducting continuum and line radiative transfer of thermochemical disk models is too time-consuming to carry out large parameter studies. Simpler approaches using a slab model to fit continuum-subtracted spectra require the identification of either the global or local continuum. Continuum subtraction, particularly when covering a broad wavelength range, is challenging but critical in rich molecular spectra as hot (several hundreds K) molecular emission lines can also produce a pseudo continuum. In this work, we present CLIcK, a flexible tool to simultaneously fit the continuum and line emission. The continuum model presented by Dullemond, Dominik, and Natta, and a plane-parallel slab of gas in local thermodynamic equilibrium are adopted to simulate the continuum and line emission, respectively, both of them are fast enough for homogeneous studies of large disk samples. We applied CLIcK to fit the observed water spectrum of the AA Tau disk and obtained water vapor properties that are consistent with literature results. We also demonstrate that CLIcK properly retrieves the input parameters used to simulate the water spectrum of a circumstellar disk. CLIcK will be a versatile tool for the interpretation of future James Webb Space Telescope spectra.
KW - Astrochemistry
KW - Line: formation
KW - Protoplanetary disks
KW - Radiative transfer
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U2 - 10.1051/0004-6361/201834418
DO - 10.1051/0004-6361/201834418
M3 - Article
AN - SCOPUS:85063009298
SN - 0004-6361
VL - 623
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A106
ER -