J/A+A/684/A213 S CrA full L- and M-band spectra (Grant+, 2024)
Full L- and M-band high resolution spectroscopy of the S CrA binary disks
with VLT-CRIRES+.
Grant S.L., Bettoni G., Banzatti A., van Dishoeck E.F., Brittain S.,
Fedele D., Henning T., Manara C.F., Semenov D., Whelan E.
<Astron. Astrophys. 684, A213 (2024)>
=2024A&A...684A.213G 2024A&A...684A.213G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, pre-main sequence ; Stars, double and multiple ;
Spectra, infrared ; Radio lines
Keywords: instrumentation: spectrographs - protoplanetary disks -
stars: pre-main sequence
Abstract:
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.
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. We
analyze the CRIRES+ data taken in all available L- and M-band
settings, providing spectral coverage from 2.9 to 5.5um. 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 the 12CO 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
∼0.1au in S CrA N and ∼0.03au in S CrA S and a narrow component coming
from ∼3au in S CrA N and ∼5au 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
(∼8x1016-4x1017cm-2), but that the broad component is coming
from a hotter and narrower region. Two filter settings, M4211 and
M4368, provide sufficient wavelength coverage for characterizing CO
and H2O at ∼5um, 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.
Description:
The VLT-CRIRES+ observations that we present here were taken during
the Science Verification phase as part of Program 107.22T7 (PI A.
Bosman). The data were taken on 18 and 19 September 2021. All L- and
M-band spectral settings (seven settings in L band and nine in M band)
were utilized, which given the upgraded cross-dispersed nature of
CRIRES+, provides full coverage from ∼2.9-5.5um.
Reduced L-band and M-band spectra for S CrA N and S CrA S.
Objects:
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RA (2000) DE Designation(s)
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19 01 08.59 -36 57 19.74 S CrA N = WDS J19011-3657A
19 01 08.64 -36 57 20.88 S CrA S = WDS J19011-3657B
-------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
scranl.dat 70 168751 S CrA N reduced L-band spectrum
scrasl.dat 70 168751 S CrA S reduced L-band spectrum
scranm.dat 68 168751 S CrA N reduced M-band spectrum
scrasm.dat 68 168751 S CrA S reduced M-band spectrum
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Byte-by-byte Description of file: scras?.dat scran?.dat
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Bytes Format Units Label Explanations
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1- 21 F21.16 nm lambda Wavelength
23- 44 F22.19 --- NFlux ?=- Normalized flux
45- 70 F26.20 --- e_NFlux ?=- Flux uncertainty
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Acknowledgements:
Sierra Grant, sierrag(at)mpe.mpg.de
(End) Patricia Vannier [CDS] 14-Feb-2024