Diapositiva 1

1
Loredana Spezzi INAF-Catania Astrophysical
Observatory
The Spitzer c2d Survey in low-mass star forming
regions Chamaeleon II Lupus
2
The Spitzer c2d survey From Molecular Cores to
Planet-forming Disks
(Evans et al. 2003, PASP 115, 965)

• Scientific aim ..to study the process of star
  and planet formation from the earliest stages of
  molecular cores to the epoch of planet-forming
  disks
• Observations (IRAC, MIPS, IRS_at_Spitzer)
• five nearby molecular clouds Perseus,
  Ophiuchus, Serpens, Lupus, Chamaeleon II
• 150 compact molecular cores
• ?300 stars in a wide range of evolutionary states

3
The survey in Cha II
(Spezzi et al., astro-ph 0802.4351 Alcalà,
Spezzi et al. 2008, ApJ 676, 427)

• R, I, z, H?7, H?12, 856 nm, 914 nm WFI _at_ ESO
  2.2m tel.
• (Spezzi et al. 2007, AA 470, 218)
• 3.6, 4.5, 5.8 and 8 ?m IRAC_at_Spitzer (Young et
  al. 2005, ApJ 628, 283)
• 24, 70 and 160 ?m MIPS_at_Spitzer (Porras et al.
  2007, ApJ 656, 493)

Alcalà, Spezzi, et al. 2008, ApJ 676, 427
WFI
IRAC
MIPS
4
The survey in Lupus
(Merìn, Jørgensen, Spezzi et al. , astro-ph
0803.1504)
Adapted from Cambrèsy 1999
Goals Same as in Cha II, but in a different
star-forming environment!
5
Identification of young stellar objects
(Spezzi et al. 2007, AA 470, 281 Alcalà, Spezzi
et al. 2008, ApJ 676, 427 Spezzi et al.,
astro-ph 0802.4351)
Selection of young objects with and without IR
excess
6
Stellar and disk parameters
(Spezzi et al., astro-ph 0802.4351 Alcalà,
Spezzi et al. 2008, ApJ 676, 427)
Rhole, Rdisk, Mdisk,Maccr, Grain size, incl.
angle, etc
7
Star formation history
(Alcalà, Spezzi et al. 2008, ApJ 676, 427 Spezzi
et al., astro-ph 0802.4351 Merìn, Jørgensen,
Spezzi et al. , astro-ph 0803.1504)
Cha II
Lupus clouds
M/M?
8
Brown Dwarfs with disks
(Alcalà, Spezzi et al. 2006, AA 453, L1-L4)
(Merìn,.Comeròn, Frasca,
Alcalà et al. 2007, ApJ 661, 361)
BDs Very-low mass stars More massive
stars Common formation process? (see also Alcal?
et al. 2004 Barrado Y Navascués et al. 2004
Luhman 2005 Preibish et al. 2005)
9
IR classification and disk fraction
(Alcalà, Spezzi et al. 2008, ApJ 676, 427 Merìn,
Jørgensen, Spezzi et al. , astro-ph 0803.1504)
See also IC348 (Lada et al. 2006, AJ 131, 1574)
10
Summary
1. The Spitzer c2d Survey in Cha II and
Lupus 2. Star formation history - Mass
spectrum stellar and sub-stellar IMF -
Ages - SFE and SF rate 3. Properties of
circumstellar disks - Disks around sub-stellar
objects - IR classification and disk fraction

• Future developments with
• II generation VLT intruments (XSHOOTER, SPHERE)
  and HST
• ? Extend these investigations to
  low-metallicity Enviromments (Magellanic Clouds)
• Goulds Belt mapping with Herschel
• ? BD and planet formation constrain the disk
  parameters

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Transition objects
(Alcalà, Spezzi et al. 2008, ApJ 676, 427 Merìn,
Jørgensen, Spezzi et al. , astro-ph 0803.1504)
Cha II
Lupus clouds