Precision Doppler spectroscopy Guillem Anglada-Escude School of Physics and Astronomy Queen Mary, University of London Institute for Astrophysics Georg-August-Universität.

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Presentation transcript:

Precision Doppler spectroscopy Guillem Anglada-Escude School of Physics and Astronomy Queen Mary, University of London Institute for Astrophysics Georg-August-Universität Göttingen 2 nd CARMENES science meeting

Precision Doppler spectroscopy as a detection method Indirect methods Kinematic Doppler spectroscopy AstrometryTiming Photometric Gravitational micro-lensing Transit Dynamic Orbital perturbations Disk-planet interactions Star-planet interactions

K Time RV  Precision Doppler spectroscopy as a detection method

Width of a typical solar line is 15 km/s Spectroscopic binary K=30 km/s Hot jupiter K=300 m/s Precision Doppler spectroscopy as a detection method

0 m/s Precision Doppler spectroscopy as a detection method

+ 3 m/s Precision Doppler spectroscopy as a detection method

+ 3 m/s Precision Doppler spectroscopy : (quick & unfair) historical overview

Tau Ceti G8.5V Order Pixel 6900 A 3800 A HARPS-ESO Spectral format Precision Doppler spectroscopy as a detection method

Precision Doppler spectroscopy : (quick & unfair) historical overview + Perforated binary mask (CORAVELs) Digital CCF (ELODIE) Hot jupiters Tellurics HF cell (CFHT) Iodine cell - (M. Hamilton) Warm Jupiters 50 m/s 25 m/s 5 m/s Echelle spectrograph CCD Computers Stabilized spectrographs 300 m/s 10 m/s Absorption cells 4 m/s NextGen CCDs 3 m/s Dedicated ultra-stable (HARPS-ESO) Sub-Neptune Large telescopes (HIRES-Keck) Sub-Neptune 2 m/s 1 m/s <1 m/s G, K dwarfs Software, Pipelining + calibration Few Earth masses Dedicated semi-stabilized (PFS-Magellan) Few Earth masses

High incident angle Grating Prism Many interference orders overlapped Orders separated Absorption cell

Stabilized spectrograph High incident angle Grating Prism Many interference orders overlaping Orders separated

High incident angle Grating Prism Many interference orders overlaping Orders separated Fiber – light transport + scrambling Stabilized spectrograph

G dwarf 1 AU M dwarf 0.1 AU 30 m/s950 m/s 0.1 m/s 3.1 m/s Exo-Jupiter formula Exo-Earth formula 500+ planets ELODIE, Hamilton, HIRES/Keck, CORALIE, HARPS, UVES/VLT, AAT … Happening now… HARPS, PFS/Magellan, HIRES/Keck Precision Doppler spectroscopy : (quick & unfair) historical overview

High resolution – Large telescopes (CRIRES) Absorption cells 6 m/s 50 m/s New large format arrays, nIR cross dispersion, stabilized cryogenic optics… Tellurics HF cell (CFHT) Iodine cell - (M. Hamilton) Warm Jupiters Large telescopes (HIRES-Keck) Sub-Neptune Dedicated semi-stabilized (PFS-Magellan) Few Earth masses 50 m/s 25 m/s 5 m/s 4 m/s 2 m/s Absorption cells Infrared (~2000) First high-res spectrographs (CSHELL-IRTF, 256x256 pixels) Echelle – low resolution (Tellurics-NIRSPEC) 100 m/s

Bean et al. ApJ 2010 Proxima Cen, CRIRES/VLT with Ammonia RMS 5.4 m/s Proxima Cen, HARPS/3.5m RMS 2.3 m/s M-dwarfs : Radial velocities in the near infrared?

Requires an absorption cell External calibration source (ThAr) But (some) HARPS data is public! Absorption cell technique Stabilized spectrograph Precision limited by PSF Stabilized PSF Works on any spectrograph Specialized spectrograph No-cell templates are critical High SNR templates Available on several instruments Built only by Geneva group Very complex software. Private data reduction pipelines Proprietary instruments & Data reduction pipelines … Absorption cell (optical and nIR) vs Stabilized spectrographs (optical) & CARMENES!

Doppler measurement Ideal template of the star F(k ) f i i=1,…N obs Observed spectrum

Doppler measurement Most simple case : Only Doppler offset

Doppler measurement Most simple case : Only Doppler offset A bit better: Doppler offset + flux scaling

Doppler measurement Most simple case : Only Doppler offset Even better : Polynomial flux correction n

Doppler measurement 2

Preferred solver (and interpolator) min

Doppler measurement : and what about cross-correlation methods?

22 Doppler measurement : and what about cross-correlation methods?

2 2 Doppler measurement : and what about cross-correlation methods?

2 2 Doppler measurement : and what about cross-correlation methods?

Doppler measurement : and what about cross-correlation methods?

Cross Correlation Function (CCF) D. Queloz, Proc. IAU Symposium RV offset (km/s) CCF Cross-correlation with binary mask (weighted) Proxima Cen

Tau Ceti G8.5V Barnard’s M4V ? ?? ? ? ?? ? ???? ? ? ? ? ?? ? ? ? ? ???? OK! Mask CCF in M dwarfs?

Least-squares matching is much better! Barnard’s star, M4V

Least-squares matching is much better!

Some M-dwarfs are more stable than G and K dwarfs! 2.6% Perspective acceleration effect Zechmeister et al A&A

Some M-dwarfs are more stable than G and K dwarfs! 2.6% Perspective acceleration effect Zechmeister et al A&A Now we are surfing the photon noise!

We got RV, now what?

Toolbox : periodograms P P P Pnull

Toolbox : periodograms P null 2 i i i More detailed/correct discussion see: Baluev 2009 & 2012 (his codes are public!)

Toolbox : periodograms P null

Toolbox : periodograms P null M sin i = 11.0 M earth M sin i = 4.4 M earth RMS 1.6 m/s

Multiplanet system! GJ 676A, M0V 2 gas giants +1 hot Neptune +1 very hot super-Earth Anglada-Escude & Tuomi, 2012 A&A AU AU 1.8 AU 5.2 AU

Likelihood function Period Mass Toolbox : Bayesian MCMC

Likelihood function Period Mass Provides optimal sampling in highly dimensional spaces N = x Nplanets Run a few million steps and you are done! Toolbox : Bayesian MCMC

Combined constrains Example : GJ 317 astrometry + radial velocity Toolbox : Bayesian MCMC

Periodograms + Bayesian + dynamics + priors + attempts to model red noise

b c d e f g Applying dynamical stability prior

Periodograms + Bayesian + dynamics + priors + attempts to model red noise b c (h)

Take home message Understand your instrument AND YOUR DATA Learn how to design your model optimization scheme Get trained into basic data analysis techniques. Take a course if necessary Think further : Bayesian RV measuring algorithm? How can I measure line shapes? (e.g. bisector-like indices) How to incorporate activity information into the Doppler model? Find collaborators to take care of thinks you don’t have time to learn (e.g. dynamics!) or do (TRANSIT SEARCHES, anybody in charge???) Be skeptic of black-boxes. If you can code it, you master it.