We present the detection of a secondary outflow associated with a Class I
source, Ser-emb 15, in the Serpens Molecular Cloud. We reveal two pairs of
molecular outflows consisting of three lobes, namely primary and secondary
outflows, using ALMA 12CO and SiO line observations at a resolution of 318 au.
The secondary outflow is elongated approximately perpendicular to the axis of
the primary outflow in the plane of the sky. We also identify two compact
structures, Sources A and B, within an extended structure associated with
Ser-emb 15 in the 1.3 mm continuum emission at a resolution of 40 au. The
projected sizes of Sources A and B are 137 au and 60 au, respectively. Assuming
a dust temperature of 20 K, we estimate the dust mass to be 0.0024 Msun for
Source A and 0.00033 Msun for Source B. C18O line data imply the existence of
rotational motion around the extended structure, however, cannot resolve
rotational motion in Source A and/or B, due to insufficient angular and
frequency resolutions. Therefore, we cannot conclude whether Ser-emb 15 is a
single or binary system. Thus, either Source A or B could drive the secondary
outflow. We discuss two scenarios to explain the driving mechanism of the
primary and secondary outflows: the Ser-emb 15 system is (1) a binary system
composed of Source A and B or (2) a single star system composed of only Source
A. In either case, the system could be a suitable target for investigating the
disk and/or binary formation processes in complicated environments. Detecting
these outflows should contribute to understanding complex star-forming
environments, which may be common in the star-formation processes.Comment: 21 pages, 10 figures, Accepted for publication in the Astrophysical
Journa