a planet hunter in the north francesco pepe geneva observatory harps-n consortium & the
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A planet hunter in the North
Francesco PepeGeneva ObservatoryHARPS-N Consortium& the
Consortium and Science Team
Consortium
Geneva Observatory (Head), CfA (Cambridge), Harvard University. INAF-TNG, University of St. Andrews, University of Edinburgh, Queens University Belfast
Many thanks to all the collaborator for the incredible work!
HARPS-N Science Team
Andrew Collier-Cameron, David Charbonneau, David Latham, Mercedes Lopez-Morales, Christophe Lovis, Michel Mayor, Giusi Micela, Francesco Pepe, David Phillips, Giampaolo Piotto, Didier Queloz, Kenb Rice, Dimitar Sasselov, Damien Ségransan, Alessandro Sozzetti, Andrew Szentgyorgyi, Stéphane Udry, Chris A. Watson and Collaborators ...
HARPS-N Historical background
Idea was born in 2005 (Latham, Mayor, Sasselov). The need for a HARPS-like instrument in the northern hemisphere was recognized, to follow-up by RVs the many expected Kepler candidates, only visible from the north ... to be ready in 2009
PDR in December 2007
2008 and 2009 Project stalled because of financial difficulties
Spring 2010 re-organization of the Consortium, the project and the financial resources.
Summer 2010 negotiation with INAF-TNG
December 2010 signature of Agreement with INAF and Collaboration agreement
March 2012 installation at La Palma
August 2012 start of operations
...
HARPS-N Historical background
September 16th, 2012. Repair of Detector-dewar leak and break-down of CCD
September 30th, 2012. PO for the new CCD ... without money ;-(
November 9th, 2013. New chip installed and operating ... ;-)
February 9th - 18th, 2013. Final mission:
New Sequencer (it is really nice, now;-)
Upgrade of the Labview SW, in particular guiding
Installation of all sensors, isolation, thermal control
Focus procedure using the exposure meter
Improvement of the interfaces with TNG
New Fabry-Pérot vessel: Now stable to better than 0.5m/s per night!!!
Many thanks to all the good guys !!!
HARPS-N Latest Sequencer changes
(End of June 2013)
Using look-up table for telescope focus automatically (not the same as through-focus)
Abort during pointing works correctly
Focus procedure improved. It use now the Exposure Meter and the shutter is controlled directly from the Sequencer
Stop tracking after focus
Stop AG after each OB to avoid unwanted telescope tracking
'Real' lamp and dust cover now updated every 4 seconds
Lamps status checked at the beginning of the OB.
THAx warm-up time of 10 minutes checked at the beginning of each template.
THA1 asked for switch-off after each OB (timer of 5 minutes)
New LED FF template available and executed each night. No DRS yet.
HARPS-N Other improvements
Now overflow from Exposure Meter anymore (since June 27th)
Exposure Meter provides efficiency and mid-time of exposure in fraction instead of time (since April 4th)
Headers complete and uniform (since April 4th). Update of the archive still pending
Problem with ‘axis failed’ solved (since July 2013)
AG stability and reliability improved, especially on faint objects (since may 2013)
FP stable and available for any/faint sources. Just use it by selecting ‘wavesimult’ instead of ‘thosimult’ OBs. DRS will work as usual. Nothing else to do. Recommended for objects fainter than V = 11, if simultaneous reference necessary. Normally stability of the spectrograph better than 1.5 m/s. FP better than 10-20 cm/s per night.
DRS improved. New version not yet released (see later in the presentation)
A few problems (failures) repaired thanks to the excellent actions by Adriano Ghedina and all the TNG friends.
HARPS-N
The HARPS-N CCD
E2V CCD 2314k4, 15 µm pixelsGraded coating
NSTS (nothing new)
New Sequencer
New Acquisition window
AG and ICS User Interfaces
AG and ICS User Interfaces
DRS (nothing new)
HARPS-N Still to be done
Update archived files (headers)
Release new DRS (very very soon)
Replace Labview Exposure Meter by Java Exposure Meter (Nicolas Buchschacher)
It will be possible to see the obtained SNR in the Sequencer window. The plan is to have an option to ‘halt on SNR’, in addition to ‘TEXP’
Replace TH operations by FP operations -> solve the lamp availability problem
Any other idea? Contributions are welcome.
A few issues with telescope reliability.
Efficiency & bench mark
mv = 8 G-star in 10 minutes
K0V: SNR=60 <=> 1 m/s in 1 hour on mv = 12
De-centering tests (cont’d)
De-centering tests (cont’d)
SNR tests
De-centering tests
RV standard
1.29 m/s rms
Kepler-78b: Transit
Kepler-78b: Radial velocities
Pepe et al. 2013 (submitted)
An update on the HARPS-N DRS
Christophe LovisGeneva ObservatoryHARPS-N Consortium& the
The scientific reduction recipe
1.Read raw image and ‘format’ frame
2.Cosmetic correction (interpolation of identified ‘bad’ columns and pixels
3.BIAS correction using overscan only
4.Read order profile from spectral FF calibration (profile determined from FF, no analytical function)
5.Convert to e-
6.Correct for CTE effects (new)
7.Dark correction (negligible)
8.General (low spatial frequencies) background measurement
9.Optimum extraction (A, B or both) considering background and contamination reference frame (thoB or waveB)
10.Flat-field correction using FF reference calibration
11.Apply wavelength calibration lamda(x) determined from ThAr calibration frame on fiber A!
12.Save e2ds spectra
The scientific reduction recipe
13.Produce and save s1d spectra (de-instrument-transmittance, de-blaze and join)
14.Compute and display instrumental drift using fiber B (either ThAr -> ThAr or FP -> FP)
15.Correct wavelength solution of fiber A from drift measured on fiber B
16.Compute barycentric velocity and correct wavelength solution
17.Reject cosmics
18.Compute flux-weight correction
19.Compute RV by means of numerical cross correlation CCF (+ BIS, FWHM, Contrast, logR’HK, errors, etc.)
20.Save CCF files and other products
Latest DRS upgrades
Background and contamination correction implemented and working
CTE correction implemented and working (on new frames only, at present)
Computation of R’HK implemented and tested
Flux-weight correction implemented in RV computation
Correction of mid-time of exposure taken into account since June 2013.
Other adaptation done, e.g. management of changing CCDs
Still to be done
DRS to be released
Update of archive data (headers) and re-run DRS (by archive personnel and TNG)
Many other ideas, but HR needed ... Any contribution will be welcome
SNR problem on star (solved)
Stable IP: BIS, FWHM, CONTRAST
KOI-141
R’HK computation
The HARPS-N LFC