MINDS: Mid-infrared atomic and molecular hydrogen lines in the inner disk around a low-mass star
arxiv(2024)
摘要
This work aims to measure the mass accretion rate, the accretion luminosity,
and more generally the physical conditions of the warm emitting gas in the
inner disk of the very low-mass star 2MASS-J16053215-1933159. We investigate
the source mid-infrared spectrum for atomic and molecular hydrogen line
emission. We present the full James Webb Space Telescope (JWST) Mid-InfraRed
Instrument (MIRI) Medium Resolution Spectrometer (MRS) spectrum of the
protoplanetary disk around the very low-mass star 2MASS-J16053215-1933159 from
the MINDS GTO program, previously shown to be abundant in hydrocarbon
molecules. We analyzed the atomic and molecular hydrogen lines in this source
by fitting one or multiple Gaussian profiles. We then built a rotational
diagram for the H2 lines to constrain the rotational temperature and column
density of the gas. Finally, we compared the observed atomic line fluxes to
predictions from two standard emission models. We identify five molecular
hydrogen pure rotational lines and 16 atomic hydrogen recombination lines. The
spectrum indicates optically thin emission for both species. We use the
molecular hydrogen lines to constrain the mass and temperature of the warm
emitting gas. The HI (7-6) recombination line is used to measure the mass
accretion rate and luminosity onto the central source. HI recombination lines
can also be used to derive the physical properties of the gas using atomic
recombination models. The JWST-MIRI MRS observations for the very low-mass star
2MASS-J16053215-1933159 reveal a large number of emission lines, many
originating from atomic and molecular hydrogen because we are able to look into
the disk warm molecular layer. Their analysis constrains the physical
properties of the emitting gas and showcases the potential of JWST to deepen
our understanding of the physical and chemical structure of protoplanetary
disks
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