Full L- and M-band high resolution spectroscopy of the S CrA binary disks with VLT-CRIRES+
arxiv(2023)
摘要
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
5.5 μm. We detect emission from ^12CO (v=1-0, v=2-1, and v=3-2),
^13CO (v=1-0), hydrogen recombination lines, OH, and H_2O 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 ∼0.1 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 (∼1-7×10^17
cm^-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 H_2O 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.
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