TY - GEN
T1 - The SONYC survey
T2 - XIV Latin American Regional IAU Meeting
AU - Muzic, K.
AU - Scholz, A.
AU - Jayawardhana, R.
AU - Geers, V. C.
AU - Dawson, P.
AU - Ray, T. P.
AU - Tamura, M.
PY - 2014/10
Y1 - 2014/10
N2 - Deep surveys of star forming regions are the backbone of observational
studies on the origin of stars and planets: On one side, they provide
large and homogeneous object samples required to study disks, accretion,
and multiplicity. On the other side, such surveys determine the shape
and the low-mass limit of the Initial Mass Function (IMF), which are
fundamental constraints on star formation theory. SONYC, short for
``Substellar Objects in Nearby Young Clusters", is an ongoing project to
provide a census of the substellar population in nearby star forming
regions. We have conducted deep optical and near-infrared photometry,
combined with proper motions, and followed by extensive spectroscopic
follow-up campaigns with Subaru and VLT, in which we have obtained more
than 700 spectra of candidate objects in NGC1333, ρ Ophiuchi,
Chamaeleon-I, Upper Sco, and Lupus-3. We have identified and
characterized more than 60 new substellar objects, among them a handful
of objects with masses close to, or below the Deuterium burning limit.
Thanks to the SONYC survey and the efforts of other groups, the
substellar IMF is now well characterized down to ˜ 5 - 10 M_{J},
and we find that the ratio of the number of stars with respect to brown
dwarfs lies between 2 ad 6. Another important piece of information for
the star formation theories is that, down to ˜ 5 M_J, the
free-floating objects with planetary masses are 20-50 times less
numerous than stars, so that their total contribution to the mass budget
of the clusters can be neglected. In this contribution we will present
the status of the SONYC survey, discuss its main results, and focus on
the latest findings in NGC1333, Lupus-3 and Upper-Sco.
AB - Deep surveys of star forming regions are the backbone of observational
studies on the origin of stars and planets: On one side, they provide
large and homogeneous object samples required to study disks, accretion,
and multiplicity. On the other side, such surveys determine the shape
and the low-mass limit of the Initial Mass Function (IMF), which are
fundamental constraints on star formation theory. SONYC, short for
``Substellar Objects in Nearby Young Clusters", is an ongoing project to
provide a census of the substellar population in nearby star forming
regions. We have conducted deep optical and near-infrared photometry,
combined with proper motions, and followed by extensive spectroscopic
follow-up campaigns with Subaru and VLT, in which we have obtained more
than 700 spectra of candidate objects in NGC1333, ρ Ophiuchi,
Chamaeleon-I, Upper Sco, and Lupus-3. We have identified and
characterized more than 60 new substellar objects, among them a handful
of objects with masses close to, or below the Deuterium burning limit.
Thanks to the SONYC survey and the efforts of other groups, the
substellar IMF is now well characterized down to ˜ 5 - 10 M_{J},
and we find that the ratio of the number of stars with respect to brown
dwarfs lies between 2 ad 6. Another important piece of information for
the star formation theories is that, down to ˜ 5 M_J, the
free-floating objects with planetary masses are 20-50 times less
numerous than stars, so that their total contribution to the mass budget
of the clusters can be neglected. In this contribution we will present
the status of the SONYC survey, discuss its main results, and focus on
the latest findings in NGC1333, Lupus-3 and Upper-Sco.
UR - http://sait.oat.ts.astro.it/MSAIt840413/index.html
M3 - Conference contribution
VL - 44
T3 - Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias)
SP - 141
EP - 142
BT - XIV Latin American Regional IAU Meeting
A2 - Mateus, A.
A2 - Gregorio-Hetem, J.
A2 - Cid Fernandes, R.
PB - Revista Mexicana de Astronomía y Astrofísica
CY - Florianópolis, Brasil
Y2 - 24 November 2013 through 30 November 2013
ER -