Title  Deuteration in Proto-Planetary Disks: DCO+ and HDO 
Pi     A. Dutrey
Time   25 hrs
TEMPLATE 2:
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1. Name of program and authors
	Deuteration in Proto-Planetary Disks: DCO+ and HDO 	
	Dutrey, Guilloteau et al., 


2. One short paragraph with science goal(s)

	Measure deuteration in proto-planetary disks (DCO+ and
HDO).  The sensitivity estimates are based on the following
paper.
	
	Guilloteau et al., 2006 - DM Tau


3. Number of sources 
   
   We focus first on a single representative object located at 150 pc
in Taurus (for example DM Tau). Then, we assume we make a survey of 20 sources.  
 
4. Coordinates:

4.1. Rough RA and DEC

If Taurus: RA = 04h and DEC = 30 deg

     
4.2. Moving target: no (e.g. comet, planet, ...)

4.3. Time critical: no (e.g. SN, GRB, ...)

5. Spatial scales:

5.1. Angular resolution (arcsec): ~ 1'' (150 AU at 150 pc)

5.2. Range of spatial scales/FOV (arcsec): single-field

5.3. Required pointing accuracy: (arcsec) standard

6. Observational setup

6.1. Single dish total power data: no

6.2. Stand-alone ACA: no

6.3. Cross-correlation of 7m ACA and 12m baseline-ALMA antennas: 
     no

6.4. Subarrays of 12m baseline-ALMA antennas: no


7. Frequencies:

7.1. Receiver band: Band 3, 4, 5, 6, 7, 8, or 9

	Bands 4, 8  

7.2. Lines and Frequencies (GHz): 

	Band 4: DCO+ 2-1 at 144.07373 GHz 
	Band 8: HDO  101 000 at 464.9425 GHz

7.3. Spectral resolution (km/s): 0.1 km/s

7.4. Bandwidth or spectral coverage (km/s or GHz): 10 km/s

8. Continuum flux density: ~ 100 mJy at 1.3mm

8.1. Typical value (Jy):

	Band 4: ~ 60 mJy 
	Band 8: ~ 450 mJy

9. Line intensity:

	Band 4: DCO+ 2-1 (peak) ~ 0.1 Jy 
	DCO+ 2-1: 0.1Jy ~ 0.65K for a disk size of 3'' 

	Band 8: HCO (peak, likely in absorption) ~ 0.1 Jy  


9.1. Typical value (K or Jy):
	
     Note that only about 20% of the disk is emitting at a given velocity (see Guilloteau et al., 2006), hence the brightness is 
expected to be around ~ 3K  

9.2. Required rms per channel (K or Jy): 	

DCO+: Taking Tb = 3 K as representative, a 10 sigma detection per channel, should require:  
	DCO+ 2-1: 0.3 K  	(for 1'' resolution)
For mapping  

	HDO 101-000: ~ 0.02Jy or ~ 0.12 K for a resolution of 1''
For 5 sigma detection/channel

9.3. Spectral dynamic range: standard

9.4. Calibration requirements: absolute      ( 10%)
                               repeatability ( 5%)
                               relative      ( 5%)

10. Polarization: no

11. Integration time for each observing mode/receiver setting (hr):

	Band 4: DCO+ J=2-1:  0.5h per source - MAPPING 

	Band 8: HDO 101-000: 1h per source - DETECTION

	(channel = 0.1 km/s)


12. Total integration time for program (hr):
	
	Band 4: 20 sources --> ~  5h - MAPPING  

	Band 8: 20 sources --> ~ 20h - DETECTION


13. Comments on observing strategy : standard mode
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Review v2.0:
 
	Deuteration in Proto-Planetary Disks: DCO+ and HDO 	
	Dutrey, Guilloteau et al., 


Reviewer: John Bally

This is a nice modest proposal.  However, high resolution (0.1")
observations that may resolve potential gradients and other structures
in the HCO+/DCO+ ratio may be of interest.