README web version of /home/usg/OPS/MTS/readme_xml/readme_83095801

Principal Investigator Email Address

• claire.martin-zaidi@obs.ujf-grenoble.fr

Estimated Total Execution Time (hours, including overheads)

• 8.0

General Description

• We propose to observe a sample of young stars with large inner holes in
   their disks, discovered with Spitzer thanks to their characteristic Spectral Energy
   Distributions. These rare objects are very interesting because they have massive
   dust disks beyond 10-20 AU but large inner holes where planets could be currently
   forming at ages between 1 and 10 Myrs. The high-resolution UVES optical spectra
   will provide detailed information about the stellar parameters and the gas accretion
   through the holes towards the stars. These UVES observations will be associated
   with VISIR imaging observations (run A). The diffraction-limited VISIR mid-infrared
   imaging will confirm and directly measure the holes, impossible to do accurately
   with unresolved data, and give information about the spatial distribution of different
   dust species (e.g., large grains vs. PAHs). The combination of both diagnostics
   will provide strong support in favor or against the presence of currently forming
   planets in these disks
  
  The proposed UVES observations will thus be used to determine the gas mass accretion
   rates in our sample, in order to discriminate between the photoevaporation or planet
   formation disk clearing. We will use the H_alpha 10% width to derive mass accretion
   rates. Double photospheric absorption lines could probe the presence of spectroscopic
   binarity, the other main possible cause for the disk holes. Finally, high-quality
   spectra can be also used to measure the metallicity and detailed spectral parameters
   of the targets, to seek for an early evidence of the planet-host metallicity trend.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• All the OBs need at least:
  Sky transparency: clear
  Seeing less than 1.0
  lunar phase: at least grey time
  
  airmass: for most of our target we asked maximum airmass of 1.6
  
  some of our targets never rises above 1.5 airmass. They thus can be observed at
   higher airmass than 1.6.

Time-Critical Aspects

• no time-critical aspects

Special Execution Requirements

• ---(Empty)---

Special Calibration Information

• ---(Empty)---

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Do all your OBs comply with the instrument-specific requirements listed
 on the instrument-specific Phase 2 web page ?

• YES

Do all your finding charts comply with both the general and instrument-specific
 Phase 2 Web Pages ?

• YES

If you submitted OBs for standard stars, did you specify the magnitude
 and spectral type of all standard stars in the OBs ?

• N/A

Have you specified the S/N ratio at given wavelength in the User Comments
 field of each OB?

• YES

Have you included OBs for any calibrations that you need but which are
 not part of the Calibration Plan ?

• N/A

If you are observing Moving Targets, have you attached suitable ephemeris
 files to your OBs?

• N/A

If you have preferences which OBs should be executed first, did you make
 use of the User Priority field in the OBs ?

• N/A

If this is a run that requires coordinated observations with other facilities,
 did you give proper instructions in the Time-Critical Aspects Section ?

• N/A

If you need secondary guiding, are there suitable objects within 30 arcsec
 from your target ?

• N/A