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Update on Planets WG activities

Update on Planets WG activities

Philippe Zarka
LOFAR Transients Key Project Meeting, Meudon, December 2011

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transientskp

June 23, 2012
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  1. Update on Planets WG activities P. Zarka on behalf of

    the (e)PWG
  2. (e)Planets WG members & associate members [*] activity in commissionning

    Members: Philippe Zarka (Group leader; Obs. Paris, Meudon) [***] Jean-Mathias Griessmeier (LPC2E) [***] Gregg Hallinan (National U. Ireland, Galway) Sébastien Hess (LATMOS/IPSL) [**] Walid Majid (JPL) [**] Imke de Pater (U. California, Berkeley) Hanno Spreeuw (?) [*] Daphne Stam (SRON) Graham Woan (U. Glasgow) [*] Associate members: Tim Bastian (NRAO) Julien Girard (LESIA, Meudon) [***] Artie Hatzes (Tautenburg) Jonathan Nichols (U. Leicester) [*] Elena Seran (IPSL, Paris) + support from C. Tasse (GEPI, Meudon ; Surveys) [**]
  3. Scope: - Jupiter MS emission (DAM → LF) - Jupiter

    & other planets synchrotron em. from rad. belts (Saturn?, Mercury? → LF & HF) - SS planetary lightning (Saturn, Uranus, Venus?, Mars?… → LF) - Exoplanets MS emissions : predictions for hot Jupiters and normal Jupiters, modelling… (→ LF & HF)
  4. Scope: - Jupiter MS emission (DAM → LF) - Jupiter

    & other planets synchrotron em. from rad. belts (Saturn?, Mercury? → LF & HF) - SS planetary lightning (Saturn, Uranus, Venus?, Mars?… → LF) - Exoplanets MS emissions : predictions for hot Jupiters and normal Jupiters, modelling… (→ LF & HF) λ=20 cm
  5. Scope: - Jupiter MS emission (DAM → LF) - Jupiter

    & other planets synchrotron em. from rad. belts (Saturn?, Mercury? → LF & HF) - SS planetary lightning (Saturn, Uranus, Venus?, Mars?… → LF) - Exoplanets MS emissions : predictions for hot Jupiters and normal Jupiters, modelling… (→ LF & HF)
  6. Scope: - Jupiter MS emission (DAM → LF) - Jupiter

    & other planets synchrotron em. from rad. belts (Saturn?, Mercury? → LF & HF) - SS planetary lightning (Saturn, Uranus, Venus?, Mars?… → LF) - Exoplanets MS emissions : predictions for hot Jupiters and normal Jupiters, modelling… (→ LF & HF) Tau Bootes Orbit inclination Revolution period Mag. moment Intensity Polarization Type of interaction Emitting hemisphere (RH-N, LH-S) North South
  7. LEA048: Tied Array Beam observations of Jupiter, Saturn, and selected

    candidate exoplanets Jupiter DAM (~10-40 MHz) 2005/11/30: ~a few minutes, raw voltages from ITS // Nançay 2008-2009: a few hours raw voltages 2009/11/27: 2 hours, raw voltages from 5 stations incl. int’l, // Nançay (SETI searches done in //) 2010/04/02: 20 min, raw voltages from 4 stations CS 2010/05/26: 1 hour, raw voltages from 5 stations incl. int’l 2010/06/03: 1 hour, raw voltages from 5 stations incl. int’l + incoherent sum Existing commissionning data: A. Nigl et al.: Jupiter VLBI with LOFAR/ITS and NDA 1101 Fig. 1. Dynamic spectra of a simultaneous observation with the Nançay Decametric Array () [] and ’s Initial Test Station Fig. 2. Spectra of the two linear polarizations of ’s Initial Test Station (/) (red: E-W antennae dipole beam and blue: N-S an- tennae dipole beam). The best-fit sine function (in frequency, not inten- sity) of the computed Faraday angle is superimposed to both  spec- tra. For the East-West polarization direction the maxima of the Faraday fringes are indicated with dots. 48 antennae of  and the 72 antennae of  were beam- formed in the direction of Jupiter. The spectra were computed with 0.2 ms time resolution and consequently a spectral resolu- tion of 4.9 kHz. The Jupiter signal received was expected be- tween 20 MHz and 30 MHz, where only a few narrow band lines contaminate the spectra. Below 20 MHz strong  is dom-
  8. Existing commissionning data: LEA048: Tied Array Beam observations of Jupiter,

    Saturn, and selected candidate exoplanets Saturn lightning 2010/04/08 (3h) incoherent sum of 10 stations, 30-90 MHz, On only 2010/12/17-18 (16h) incoherent sum of 22 stations, 15-75 MHz, 81 µsec x195/16 kHz, Off=PSR1133 (TBB taken in //) 2011/07/07-08 (12h) coherent sum of 5 superterp stations, 20-70 MHz, 1.3 msec x195/16 kHz
  9. NDA Existing commissionning data: LEA050: Imaging observations of Jupiter and

    Saturn Jupiter Obs in coll. with Wucknitz for long baseline imaging (LEA066) of Jupiter 2011/07/08: 1 sec visibilities with 15 stations incl. long baselines ) 2011/11/24: raw voltages with long baselines ) Total ~4h? 2011/11/10 imaging (10h, 110-190 MHz, Cal=4C +15.05) Coll. with LEA122: Jupiter polarization (circular) : 4h on 2011/01/23 Io-Jupiter em. RH ellipt. Jupiter’s auroral em. RHC NDA LOFAR LOFAR
  10. • Modest overall allocations (~50 h total) • Reports to

    LOFAR Status Meetings (to be written !) Commissionning work achieved: - General purpose IDL software (read, plot, process) → to be translated in Python - S-burst movie for LOFAR inauguration - Commissioning/test results: • Validation of occurrence prediction methods (Cassini, NDA...) • Station operation&pointing/test, LF, influence of ionosphere • Large data volumes to disk (up to 5 Tb/hour) • Structure of raw/incoherent sum/beamformed data • Observation strategy (incoherent sum unadapted to high sensitivity obs) • Comparisons of our RFI flagging (PS detected on 18/12/2010) with A. Offringa’s AOflagger (→ future «exoplanet» pipeline) • Imaging of a moving source
  11. None
  12. Potential Science results: - Detection/Characterization (spectrum, time (sub)structure, energy) of

    Saturn’s lightning ≥20 MHz (tbc, ongoing) - Fine structure of Jovian S-burst emission : flux density & polarization down to the finest time scales
  13. Plans for further commissionning observations/analyses: - Analyse Jupiter imaging data

    (cont'd) - Analyse long baselines obs of Jupiter - Analyse Jupiter polarization measurements, compared to calibrated Nançay data - Further Saturn lightning observations in better conditions that previous ones ("Call B") + Participation to development of dynamic spectrum pipeline (if programmer found) Data center in Nançay
  14. Plans for responses to calls: - Above 4 scientific topics

    : DAM, synchrotron, lightning, exoplanets - Exoplanets search/detection strategy: • Piggyback search for transients at known coordinates (in Transients Catalog) • Selected targets : hot Jupiters, normal Jupiters around high LXUV stars, Corot planets, Kepler field, all stars <10 pc, selected magnetic stars, UTR2 planets? … [ Possibility to plan joint obs. with UTR2, Cassini, Nançay, Espadons/ Narval, etc. ] - Planetary atmospheres (// survey, accurate absolute calibration, moving source) - Occultations by small SS bodies