README web version of /home/usg/OPS/MTS/readme_xml/readme_81502300

Principal Investigator Email Address

• juhasz@mpia.de

Estimated Total Execution Time (hours, including overheads)

• 1.4

General Description

• This programme is aimed at obtaining a high quality N-band spectrum of
   the
  outbursting YSO EX Lupi. We wish to analyze the dust composition in the
  upper layers of the EX Lupi disk. In january this object increased by
  a factor of 100 in optical brightness, and since then has been fading as
  a general trend, though the light curve is very irregular, and shows 
  "peaks and valleys" with an amplitude of up to 2 mag. We are monitoring
  the star in the optical every day, weather allowing.
  
  Spectra taken before the outburst show only amorphous dust. In-outburst
  Spitzer spectroscopy shows large amounts of crystlline dust, that must have
  been produced by the outburst heat.
  
  The dust in the upper disk layers should go back to amorphous on a time-scale
  of <50 years (50 years ago, the object showed an outburst of similar magnitude
  to the current one). The observations of this DDT programme are aimed at
  monitoring the 10 micron spectrum, and measuring the transformation back to
  an amorphous appearance.
  
  The time scale on which this happens is unknown (apart from that it is <50 years),
  yet is highly interesting: it provides a direct measure of the amount of turbulence
  in the inner region of an accretion disk (this is one of the most uncertain
  quantities in modern disk models, and has never been measured).
  
  In practice, the programme comprises taking a VISIR spectrum of a ~1-3 Jy source
  (the IR flux is strongly variable), and should be pretty straightforward.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• Clear conditions should suffice.

Time-Critical Aspects

• none

Special Execution Requirements

• ---(Empty)---

Special Calibration Information

• ---(Empty)---

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• ---(Empty)---

Source(s) of Pre-imaging

• ---(Empty)---

Pre-imaging sources not listed above

• ---(Empty)---

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

• YES

If this is a pre-imaging run, did you select PRE-IMAGING for the Observing
 Category for each Observing Template ?

• N/A

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 ?

• YES

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

• YES

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 ?

• YES

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 the provided finding chart is at a different wavelength than the observations,
 did you clearly describe in the README file how to identify the target?

• N/A

Did you specify a guide star brighter than V=12mag within a field of
 r=5arcmin around the science target?

• N/A