The Role of Large Surveys in Star Formation

The Role of Large Surveys in Star Formation

The Role of Large
Surveys in Star Formation
H. Arce (Yale), T. Bourke (SKA), C. Chandler (NRAO), X. Chen (PMO), J. Di
Francesco (NRC Herzberg), A. Goodman (CfA), R. Harris (Leiden), D.
Johnstone (NRC Herzberg), J. Jorgensen (Copenhagen), K. Kratter (Arizona),
L. Kristensen (CfA), K. Lee (CfA), Z.-Y. Li (UVa), L. Looney (UIUC), C. Melis
(UCSD), P. Myers (CfA), S. Offner (UMass Amherst), L. Perez (NRAO), J.
Pineda (MPIE), D. Price (Monash), S. Sadavoy (MPIfR), S. Schnee (NRAO),
D. Segura-Cox (UIUC), J. Tobin (Leiden), E. Vorobyov (Vienna)
Michael M. Dunham
SMA Fellow, CfA
US radio/mm/submm Science Futures in the 2020s
Chicago, Illinois
Tuesday, December 15, 2015
Image credit:
Evans, Dunham, et al. (2009)
The Role of Large (Interferometric)
Surveys in (Low-Mass) Star Formation
H. Arce (Yale), T. Bourke (SKA), C. Chandler (NRAO), X. Chen (PMO), J. Di
Francesco (NRC Herzberg), A. Goodman (CfA), R. Harris (Leiden), D.
Johnstone (NRC Herzberg), J. Jorgensen (Copenhagen), K. Kratter (Arizona),
L. Kristensen (CfA), K. Lee (CfA), Z.-Y. Li (UVa), L. Looney (UIUC), C. Melis
(UCSD), P. Myers (CfA), S. Offner (UMass Amherst), L. Perez (NRAO), J.
Pineda (MPIE), D. Price (Monash), S. Sadavoy (MPIfR), S. Schnee (NRAO),
D. Segura-Cox (UIUC), J. Tobin (Leiden), E. Vorobyov (Vienna)
Michael M. Dunham
SMA Fellow, CfA
US radio/mm/submm Science Futures in the 2020s
Chicago, Illinois
Tuesday, December 15, 2015
Image credit:
Evans, Dunham, et al. (2009)
0.15 – 0.24 Myr
0.31 – 0.48 Myr
3 Myr (assumed)
Figure credit: M. Persson
Lifetimes from Dunham et al. (2015)
VLA VANDAM Survey
PI: J. Tobin
Full Sample
Tobin et al. (submitted)
Class 0
Scale bars: 1” = 230 AU
Class I
Looney et al. (2000), Reipurth et al. (2002), Haisch et al. (2004), Duchene et al. (2007), Connelley
et al. (2008, 2009), Maury et al. (2010), Chen et al. (2013), Tobin et al. (2013, 2015)
ALMA Surveys
of Starless Cores
PI: M. Dunham (S. Schnee)
600 AU
600 AU
600 AU
600 AU
600 AU
600 AU
Dunham, Offner, et al. (submitted)
Dunham et al. (in prep)
Harvey et al. (2003), Kirk et al. (2009), Chen & Arce
(2010), Schnee et al. (2010, 2012), Nakamura et al.
(2012), Bourke et al. (2012), Lee et al. (2013),
Friesen et al. (2014)
SMA MASSES Survey
Dunham, Mathieu, et al., in prep
PI: M. Dunham
SMA survey of all protostars in Perseus in
continuum, outflow, and dense gas tracers
Color: 12CO (2-1)
Black: C18O (2-1)
Scale Bars: 4500 AU
SMA MASSES Survey
Dunham, Mathieu, et al., in prep
PI: M. Dunham
SMA survey of all protostars in Perseus in
continuum, outflow, and dense gas tracers
Color: 12CO (2-1)
Black: C18O (2-1)
Scale Bars: 4500 AU
Summary
Standard “cartoon” of (single) star formation well-established
Many physical processes involved in assembling final masses of stars
Understanding requires statistical approach through large surveys
Approximately 50% of protostars in multiple systems
Two populations of multiplicity: ~100 AU and few thousand AU
Significant dynamical evolution on <0.5 Myr timescales
Fragmentation may begin in the starless core stage
Role of outflows in regulating accretion currently being revealed
Other processes studied through large surveys:
Evolution of angular momentum, formation and early evolution of disks, kinematic origins of multiplicity,
chemistry, dust evolution, protostellar accretion history, existence of first hydrostatic cores