1 / 13

JIVE/JOVIAL Instrumental Concept

JIVE/JOVIAL Instrumental Concept. Patrick Gaulme New Mexico State University Apache Point Observatory. Science Objectives. JIVE/JOVIAL: provides radial velocity maps (Doppler imaging) Jovian seismology c m/s displacement of uppermost clouds

rneumann
Download Presentation

JIVE/JOVIAL Instrumental Concept

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. JIVE/JOVIAL Instrumental Concept Patrick Gaulme New Mexico State University Apache Point Observatory Patrick Gaulme - NMSU - June 26th, 2017

  2. Science Objectives • JIVE/JOVIAL: provides radial velocity maps (Doppler imaging) • Jovian seismology • cm/s displacement of uppermost clouds • Frequency range of expected oscillations [1-3] mHz, i.e., ≈[5-20] min periods. • Long time series of fast sampling data (at least 1 measurement per minute). • Venus, Jupiter, Saturn’s atmospheric dynamics • Venus zonal (100 m/s) + meridional (20 m/s?) winds • Jupiter/Saturn differential rotation ≈ ±100 m/s • Stack observations: average wind profile, average wind per longitude. Do not need long times series. Patrick Gaulme - NMSU - June 26th, 2017

  3. Radial velocity maps • What do we aim at measuring for atmospheric dynamics Patrick Gaulme - NMSU - June 26th, 2017

  4. Radial velocity maps • What do we aim at measuring for seismology • Subtraction of wind contribution to RVs • Filter each RV map by a set of spherical harmonics • Compute Fourier spectra of times series Patrick Gaulme - NMSU - June 26th, 2017

  5. Telescope TF Interferogram OPD Detector FTS OPD SYMPA/JIVE/JOVIAL are Fourier transform tachometers SpectrumS(s) s s0 I(D) =A(D)e2iPDs0 (1+v/c) Patrick Gaulme - NMSU - June 26th, 2017

  6. The SYMPA prototype • Fourier-transform imaging-spectrometer (Schmider+07, Gaulme+08, Gaulme+11) Patrick Gaulme - NMSU - June 26th, 2017

  7. The SYMPA prototype Fringes parallel to rotation axis  signature of Jupiter’s rotation Gaulme et al. 2008 Patrick Gaulme - NMSU - June 26th, 2017

  8. The SYMPA prototype Fringe Contrast g ≈ 0.6% I1 I2 I3 I4 I1 = I0 (1 + g cos f) I3 = I0 (1 – g cos f) I2 = I0 (1 + g sin f) I4 = I0 (1 – g sin f) U a cos f V a sin f Avec f = 2psD(1+v/c) et s = nombre d’onde, D = OPD et v = vitesse radiale Doppler shift = argument of complexinterferogram: Z = U + iV Colloque du PNP - Brest - Septembre 2010

  9. Observational techniquesDoppler spectrometry • Fourier transform spectrometers Patrick Gaulme - NMSU - June 26th, 2017

  10. JOVIAL/JIVE vs. SYMPA • JOVIAL • Based on SYMPA experience • Modified Mach-Zehnder design • OPD modulation for calibration • Optimisation of measurement stability, precision, resolution • Vacuum tank to insulate the interferometer • Simultaneous multi-sites observations • Noise level < 4 cm/s in 2 weeks Patrick Gaulme - NMSU - June 26th, 2017

  11. Data processing with real data • Adjustment of the four images • Position, geometrical distortion • Photometric response • Radial velocity map construction velocity map (unwrapped) Arg(Zp) Zp = Z Z*inst Residual velocity map Zinst Solid Rotation Model Patrick Gaulme - NMSU - June 26th, 2017

  12. Biases and drifts issues • PSF effect and atmospheric seeing • Positioning and RV biases • (see my presentation at 3:30pm) • Jupiter polarization • Remember, we split light according to polarization • Telescope polarization • Pupil drift • Determines where the light beam passes through the interferometer • Jupiter rotation in the field Patrick Gaulme - NMSU - June 26th, 2017

  13. JIVE at Sunspot • See Tom’s presentation Patrick Gaulme - NMSU - June 26th, 2017

More Related