Issue |
A&A
Volume 684, April 2024
|
|
---|---|---|
Article Number | A213 | |
Number of page(s) | 14 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361/202347905 | |
Published online | 29 April 2024 |
Full L- and M-band high resolution spectroscopy of the S CrA binary disks with VLT-CRIRES+★,★★
1
Max-Planck Institut für Extraterrestrische Physik (MPE),
Giessenbachstr. 1,
85748
Garching, Germany
e-mail: sierrag@mpe.mpg.de
2
Leiden Observatory, Leiden University,
PO Box 9513,
2300 RA
Leiden, The Netherlands
3
Department of Physics, Texas State University,
749 N Comanche Street,
San Marcos, TX
78666, USA
4
Clemson University,
118 Kinard Laboratory,
Clemson, SC
29631, USA
5
INAF-Osservatorio Astrofisico di Arcetri,
L.go E. Fermi 5,
50125
Firenze, Italy
6
Max-Planck-Institut für Astronomie (MPIA),
Königstuhl 17,
69117
Heidelberg, Germany
7
European Southern Observatory,
Karl-Schwarzschild-Strasse 2,
85748
Garching bei München, Germany
8
Department of Chemistry, Ludwig-Maximilians-Universität,
Butenandtstr. 5–13,
81377
München, Germany
9
Maynooth University Department of Experimental Physics, National University of Ireland Maynooth,
Maynooth Co. Kildare, Ireland
Received:
7
September
2023
Accepted:
22
December
2023
Context. The Cryogenic IR echelle Spectrometer (CRIRES) instrument at the Very Large Telescope (VLT) was in operation from 2006 to 2014. Great strides in characterizing the inner regions of protoplanetary disks were made using CRIRES observations in the L- and M-band at this time. The upgraded instrument, CRIRES+, became available in 2021 and covers a larger wavelength range simultaneously.
Aims. Here, we present new CRIRES+ Science Verification data of the binary system S Coronae Australis (S CrA). We aim to characterize the upgraded CRIRES+ instrument for disk studies and provide new insight into the gas in the inner disk of the S CrA N and S systems.
Methods. We analyze the CRIRES+ data taken in all available L- and M-band settings, providing spectral coverage from 2.9 to 5.5 μm.
Results. We detect emission from 12CO (v = 1−0, v = 2−1, and v = 3−2), 13CO (v = 1−0), hydrogen recombination lines, OH, and H2O in the S CrA N disk. In the fainter S CrA S system, only the12 CO v = 1−0 and the hydrogen recombination lines are detected. The 12CO v = 1−0 emission in S CrA N and S shows two velocity components, a broad component coming from ~0.1 au in S CrA N and ~0.03 au in S CrA S and a narrow component coming from ~3 au in S CrA N and ~5 au in S CrA S. We fit local thermodynamic equilibrium slab models to the rotation diagrams of the two S CrA N velocity components and find that they have similar column densities (~8×1016−4×1017 cm−2), but that the broad component is coming from a hotter and narrower region.
Conclusions. Two filter settings, M4211 and M4368, provide sufficient wavelength coverage for characterizing CO and H2O at ~5 μm, in particular covering low- and high-J lines. CRIRES+ provides spectral coverage and resolution that are crucial complements to low-resolution observations, such as those with JWST, where multiple velocity components cannot be distinguished.
Key words: instrumentation: spectrographs / protoplanetary disks / stars: pre-main sequence
Reduced spectra are available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (130.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/684/A213
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This article is published in open access under the Subscribe to Open model.
Open Access funding provided by Max Planck Society.
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