  Aims: The JWST program JOYS (JWST Observations of Young protoStars) aims at
characterizing the physical and chemical properties of young high- and low-mass
star-forming regions, in particular the unique mid-infrared diagnostics of the
warmer gas and solid-state components. We present early results from the
high-mass star formation region IRAS23385+6053. Methods: The JOYS program uses
the MIRI MRS with its IFU to investigate a sample of high- and low-mass
star-forming protostellar systems. Results: The 5 to 28mum MIRI spectrum of
IRAS23385+6053 shows a plethora of features. While the general spectrum is
typical for an embedded protostar, we see many atomic and molecular gas lines
boosted by the higher spectral resolution and sensitivity compared to previous
space missions. Furthermore, ice and dust absorption features are also present.
Here, we focus on the continuum emission, outflow tracers like the H2, [FeII]
and [NeII] lines as well as the potential accretion tracer Humphreys alpha
HI(7--6). The short-wavelength MIRI data resolve two continuum sources A and B,
where mid-infrared source A is associated with the main mm continuum peak. The
combination of mid-infrared and mm data reveals a young cluster in its making.
Combining the mid-infrared outflow tracer H2, [FeII] and [NeII] with mm SiO
data shows a complex interplay of at least three molecular outflows driven by
protostars in the forming cluster. Furthermore, the Humphreys alpha line is
detected at a 3-4sigma level towards the mid-infrared sources A and B.
Following Rigliaco et al. (2015), one can roughly estimate accretion
luminosities and corresponding accretion rates between ~2.6x10^-6 and
~0.9x10^-4 M_sun/yr. This is discussed in the context of the observed outflow
rates. Conclusions: The analysis of the MIRI MRS observations for this young
high-mass star-forming region reveals connected outflow and accretion
signatures.
