Call for proposals for observations on the French telescopes at OHP and TBL : second semester 2015 (15B)
Deadline for proposal upload: Friday April 10th, 2015, noon (Paris - CET time)
There is an ON-LINE procedure to prepare AND submit the proposals for OHP and TBL. See the description of this new on-line procedure below or directly at http://northstar.bagn.obs-mip.fr. The server will open on March 11th, 2015.
- There is no call for Large Programmes at TBL for 2015B.
General principles and proposal selection
Information on the telescopes and their instrumentation can be found on the respective observatory home pages:
Proposals from PIs working in a French institution are evaluated and selected according to scientific excellence by the existing French selection committee, which deals with different scientific topics (corresponding to the "Programmes nationaux" thematic structure).
- PNPS (Programme National de Physique Stellaire): Stars and stellar physics (from protostars to planetary nebulae) (coordinator boris [dot] dintrans [at] irap [dot] omp [dot] eu (Boris Dintrans))
- PCMI (Physico-chimie du milieu interstellaire): Physics and chemistry of the Interstellar Medium (coordinator maryvonne [dot] gerin [at] lra [dot] ens [dot] fr (Maryvonne Gérin))
- PNP (Programme National de Planetologie): Planetary science (coordinator morby [at] oca [dot] eu (Allessandro Morbidelli))
- PNCG (Programme National Cosmologie et Galaxies): Cosmology (coordinator Vanessa [dot] Hill [at] oca [dot] eu (Vanessa Hill))
A telescope fee for each night is requested. For the successful French teams, this fee, as well as lodging and meals (but not the travel expenses), are granted. Mixed teams with non French Co-Is are partially funded; the remaining part is paid by the foreign institutions.
All non French teams, which are eligible to the OPTICON program, must submit their proposals to OPTICON.
193cm telescope at OHP
The SOPHIE spectrograph has been available to the community since the end of October 2006. This instrument, covering the 3872-6943 Å spectral range with 39 orders, has two observing modes: high efficiency (HE, R~35000) and high spectral resolution (HR, R~75000).
For each mode two fibres each of 100 micron diameter (star and sky, or calibration) pipe the light from the Cassegrain adaptor to the spectrograph. Each fibre sees 3 arcsec of the sky. The switch between modes is obtained by moving the fibre heads in the adaptor and takes about 3 minutes. In order to achieve a higher spectral resolution, the HR mode has optical scramblers and a 40 micron exit slit. This makes the throughput 2.5 times smaller.
Simultaneous Thorium exposures in the high-resolution HR mode (HR_thosimult template : Star on fiber A and ThAr on fiber B) are only recommended for observing programs which need to achieve high accuracy radial velocities (< 10 m/s). Simultaneous Thorium exposures in the high efficiency HE mode (HE_thosimult template) are not useful and are thus not recommended.
For observing programs not requiring radial velocities more accurate than 10 m/s, it is recommended to use templates HE_AB and HR_AB (sky on fiber B) rather than templates HE_A et HR_A so that sky spectra can be recorded which, under the presence of moonlight, can contaminate the spectra (and thus the cross-correlation profile) of stars fainter than visual magnitude 10-12. Recording the sky also should allow proper subtraction from reconnected s1d spectra.
The spectrograph uses an EEV 44-82 4102x2048 pixel CCD, which has two reading modes (fast and slow). The read-out noise is 6.4e- for the fast mode(read-out time = 19sec) and 2.1 e- for the slow mode (read-out time = 197sec), which is suitable for the fainter objects. The spectrograph, attached to the telescope pillar, is installed in a thermally controlled chamber. The dispersive elements are placed in a closed tank filled with nitrogen gas, which provides a constant pressure environment. The instrument software allows the preparation of the observations, the control of the instrument , and complete real time data reduction. All data are archived at the telescope.
In June 2011, the installation of new fibres have considerably increased the stability in radial velocity in the HR mode.The scientific validation achieved during semesters 2011B and 2012A indicates an accuracy of 1-2 m/s (see Bouchy et al., A&A 549, A49, 2013) which allows to undertake Doppler asterosismology programs and search for exoplanets of low masses. A new unit of calibration lamps for SOPHIE has been installed at the beginning of semester 2014A and a new software NSTS for preparing the observations. A documentation is available online and in the control room of the telescope.
For more information see :
Service mode observing
Service observing mode is offered on the spectrograph SOPHIE. However the time devoted to this mode is limited and cannot exceed 10% of the total available time. Moreover, if the exposure time exceeds one hour per night, an appropriate justification should be given.
If an exposure, with no specific date, cannot be performed because of weather conditions, it will be reattempted the three following nights if no other service observations are planned.
In the proposal, the user should estimate the total equivalent number of nights needed for the program : the total exposure time of the program should include 5 minutes of dead time per exposure if the CCD is read out in fast mode and 8 minutes with slow read-out (including pointing of the telescope, time to prepare the spectrograph and read-out of the CCD), except if the requested exposures are consecutive. It should be noted that most of the observations use fast CCD read-out mode. The change from fast to slow read-out of the CCD (and vice-versa) requires taking an offset at each change. The mean number of hours of observations per night is 7 hours in winter and 4.5 hours in summer (including weather conditions).
The requested S/N ratio is the optimal value. The exposure time per object corresponds to the maximum time that the observation will be performed. In service mode, if the ratio S/N as given on line is obtained in a shorter time, the exposure will be automatically stopped.
In addition, if service mode observations are requested, in order to facilitate their planning, it is necessary to fill in the table “observations de service” available at http://www.obs-hp.fr/guide/sophie/obs_service.xls and to send it to ohp [dot] demandes [at] osupytheas [dot] fr at the time of the submission of the proposal.
This spectrograph is no longer offered.
In case of using a visitor instrument, it is compulsory to contact the OHP director to check the feasibility.
The proprietary period is one year. Once the proprietary period expires, the data will enter the public domain and be available to anyone.
Observations at TBL
The spectro-polarimeter Narval is offered for semester 2015B. Observations will be conducted in multi-mission service mode.
Narval is a spectro-polarimeter that allows one to observe, in a single exposure, a point-like object spectrum in two polarization states, from 370 to 1000 nm, at a spectral resolution of 65000 in polarimetric mode and of 80000 in spectroscopic mode. Narval is now the main instrument at the TBL.
For 2015B, TBL reserves 7 nights to OPTICON programs. Please note that OPTICON proposals are now handled independently by a dedicated TAC. See http://www.astro-opticon.org/ for criteria of eligibility.
For the preparation of the proposals, users are invited to consult the web pages of the instrument, which includes technical information as well as an ETC. An English version can be found at the following adddress: http://www.ast.obs-mip.fr/projets/narval/v1/.
The telescope is also open to welcome visitor instruments, assuming that the observing run extends above 15 successive nights. PIs are invited to contact the TBL director to assess the technical feasibility of their program.
Please check the latest news on developments of service observing at TBL.
TBL studies the best solutions to optimize scientific return of Narval and will try to minimize the impact on users. We are grateful to the community for its understanding and patience in time of evolving procedures.
For additional information, contact Rémi Cabanac for scientific issues and Marie-Pierre Arberet for practical ones.
A Statement from the PNPS (Stellar Physics)
Primary criteria to rate the proposals on the 2-m telescopes are: scientific value, urgency, previous experience from and results obtained by the team. Combining different proposals, proposing key-programs, and observations made in support of large-size ground base telescopes or of space born observations are greatly encouraged. Proposals requiring a large number of nights but fulfilling those conditions may be supported.
The proposals will be gathered by INSU (using the submitted proposals using the new on-line procedure) and forwarded to the selection committee.
A given proposal should refer to a main thematic field (thematic programme national), although some proposals may concern several fields.
There is no call for Large Programmes at TBL for 2015B.
Large Programmes must fulfill the following criteria :
- a large number of nights: > 10 nights/semester at minimum whatever the total duration of the project,
- the need for a long term programme: 2 years (4 semesters) even if the requested number of nights per semester remain modest,
- an annual evaluation which will follow the progress of the observing campaigns and of the analysis of obtained data. If the outcome if found unsatisfactory by the selection committee, the status of the Large Programme could be reconsidered.
The PI should therefore agree to provide :
- a short update on the observing programme on a semester basis, describing the progress of the observations and the schedule for the future runs (including problems during the previous runs, be they due to technical failure or to bad weather),
- a mid-term report including a revision of the programme schedule if needed,
- a final report when the programme is completed.
The results should be presented during the annual meeting of the French Astronomical Society (SF2A) for all programmes with a participation of French scientists (either PI or Co-Is).
New submitting procedure
We are now using a new software developed in the context of a European effort to gather time allocation requests. The software is called "NorthStar" and all proposers should connect to the dedicated site for the French telescopes.
Users should first register and then follow the instructions after login onto the web site. On-line help is available to accompany you during this process.
Please send your TECHNICAL (only) questions to Patrick [dot] Maeght [at] ast [dot] obs-mip [dot] fr (Patrick Maeght). Other questions should be directed towards either the contact person for each telescope or towards the INSU representative ().
Deadline for proposal submission : Friday April 10th, 2015 at noon. No late proposals will be considered, whatever the reason.
Chargé de mission INSU