# What is to expect from the transit method. M. Deleuil, Laboratoire d Astrophysique de Marseille Institut Universitaire de France

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1 What is to expect from the transit method M. Deleuil, Laboratoire d Astrophysique de Marseille Institut Universitaire de France

2 Transit - method Occurrence: only if the planet orbital plane is close to the observer s line of sight. The planet must cross over the diameter of the star as we watch it. Transit D No transit D

3 Transit - occurrence Probability of transit occurrence

4 Transit - occurrence Probability of transit occurrence a p D

5 Transit - occurrence Probability of transit occurrence a p D Range of solid angles under which a transit can be observed :

6 Transit - occurrence Probability of transit occurrence a p D Range of solid angles under which a transit can be observed : Transit probability (geometric):

7 Transit -observables Geometry is described by the transit depth, shape and duration F 0 : out-of transit flux t c : mid transit time = (F 0 - F transit )/F 0 flux of the photometric decrement during the full phase of the transit Δ : duration of the ingress or egress ΔT : total duration (between the mid point) P : the period

8 Transit - observables The shape changes depending on the geometry of the star and the planet shorter duration for large impact parameter & V-shape

9 Transit -Physical parameters Assuming : a circular orbit the planet is dark a single star the stellar mass-radius relation is known the transits have a flat bottoms the orbital period is known (2 transits at least)

10 Transit -Physical parameters Physical parameters to be derived from the observables : M, R, a, i, R p Radii ratio R p R = δ = ΔF F 0 Impact parameter: b = a p cos(i) R = 1 δ T τ Scaled stellar radius : a π T τ 1+ esinω δ 1/4 P 1 e 2 e orbital eccentricity ; ω argument of pericenter R Seager & Mallen-Ornelas, ApJ 585, 2003; Carter et al., 2008

11 Transit -Physical parameters Combined to Kepler s law mean stellar density ρ 3P π 2 G δ Tτ 3/2 1 e 2 (1+ esinω) 2 3/2 useful to help identifying blends and get the star s radius Seager & Mallen-Ornelas, 2003 APJ 585, 1038; Southworth et al., 2007, MNRAS 379 giant star ; dwarf stars

12 Transit - some numbers Planet ΔT (hour) ΔF/F (%) Pr (%) Orbital Period (year) Mercury The Earth Mars Jupiter Requirements : to catch transits continuous observations - high duty cycle to detect small size planets high photometric precision to compete against the low geometric probability monitor a high number of targets

13 Transit : issues with the star the limb-darkening effect : the stellar disk is not uniform affect the transit shape depends on the star s physical parameters (Teff, logg) - color effect and on the photometric system Narrow band-width large effects of stellar limb darkening Smoother edges and U shape bottom large uncertainties on the transit s parameters Smoother edges and U shape bottom Seager & Mallen-Ornelas, ApJ 585, 2003 Pal, , 0.8, 0.55, and 0.45µm

14 Transit : issue with the star (again!) the stars fundamental parameters : R but also Teff, [M/H] & age - could result in large uncertainties on the planet s parameters Torres et al., 2008, ApJ 677

15 Transit : issue with the star (again!) the stars fundamental parameters : R but also Teff, [M/H] & age - could result in large uncertainties on the planet s parameters Derived from transit fit Torres et al., 2008, ApJ 677

16 Transits in practice Observe your stars over a long time lag, perform photometry with the best precision you can achieve, build light curves

17 Transits in practice Observe your stars over a long time lag, perform photometry with the best precision you can achieve, build light curves

18 ... get some transits Perform transit detection with your favorite software

19 ... get some transits Perform transit detection with your favorite software

20 Transits : planet or stars? Eclipsing binary

21 Transits : planet or stars? Eclipsing binary

22 Transits : planet or stars? Eclipsing binary

23 Transits : planet or stars? Eclipsing binary m v =13.2 P=10.5 d SB1

24 Transits : planet or stars? blends Check the photometric behavior of the nearby stars

25 Transits : planet or stars? blends inside the seeing : spectroscopic check Bisector Span

26 Transits : planet or stars? blends inside the seeing : spectroscopic check Bisector Span

27 Transits : planet or stars? blends inside the seeing : spectroscopic check Bisector Span

28 Transits : planet or stars? blends inside the seeing : spectroscopic check Bisector Span

29 Transits : planet or stars? blends inside the seeing : spectroscopic check Bisector Span Amplitude change with the CCF template

30 Transits : in practice Different codes exist to calculate realistic LC e.g. Giménez (2006,A&A 207) on the phase-folded transit determine : the transit center Tc, the orbital phase at first contact θ1, the ratio of radii k, the orbital inclination i and the limb darkening coefficients or global analysis of the photometry and the radial velocity measurements with Bayesian Markov Chain Monte- Carlo (MCMC) algorithm : the ratio of the radii, the transit width (from first to last contact) W, the transit impact parameter, the orbital period P, the time of minimum light T0, the two parameters (e) cosω and (e) sinω where e is the orbital eccentricity and ω is the argument of periastron, and the parameter, K2 = K (1 e 2 )P 1/3 where K is the RV orbital semi-amplitude. Aigrain et al., 2008, A&A 448

31 Transit versus radial velocity Method transit radial velocity parameters P, R p, i Msini, P, e limitations star s size; stars parameters slow rotators, stellar activity bias dwarfs spectral type Association of the two methods : the planet s fundamental parameters ; the complete orbit parameters; allow to enlarge the space parameters toward active stars or fast rotators

32 Transits : probing planetary systems Assuming the photometric precision is high enough you can : measure the planetary radius : bring constrains on the planet evolution and migration history and on planet s composition and atmosphere. the orbital plane configuration : period, eccentricity, inclination the planet s atmospheric properties : albedo, thermal emission, composition Stellar surface: limb darkening, spots Star - planet interactions Additional unseen companion (TTV) planet or moons Rings and satellites Oblateness & obliquity

33 Transits - current situation Transit

34 Transits - planet s nature 123 transiting planets a striking diversity & the very first secured rocky planets

35 Spectroscopic transit or the Rossiter-McLaughin effect V rad > 0 when the distance source - observer increases - red V rad < 0 when the distance source - observer decreases- blue star s rotation axis

36 Spectroscopic transit or the Rossiter-McLaughin effect V rad > 0 when the distance source - observer increases - red V rad < 0 when the distance source - observer decreases- blue star s rotation axis

37 Spectroscopic transit or the Rossiter-McLaughin effect V rad > 0 when the distance source - observer increases - red V rad < 0 when the distance source - observer decreases- blue star s rotation axis Measure of the sky-projected angle between the stellar rotation axis and a planet's orbital axis see Queloz et al., 2000, A&A 359 L13 e.g.

38 Spin-orbit : probing the hot Jupiters dynamical origin Fig. 6. Rossiter-McLaughlin effect models with λ = 70 and the low R p value reported by Winn et al. (2008a). The squares (open and filled) are the SOPHIE radial-velocity measurements of XO-3 with 1σ error bars as a function of the orbital phase. Only the first four measurements (filled squares) are used for the Keplerian fit (together with 19 measurements at other orbital phases; see Sect. 4.1). The solid and dotted lines are the Keplerian fits with and without the Rossiter-McLaughlin effect. Fig. 8. Schematic view of the XO-3 system with transverse transit, as seen from the Earth. The stellar spin axis is shown, as well as the planet orbit and the λ misalignment angle (or stellar obliquity). The grey area shows the range λ = 70 ± 15, which is favored by our observations (see Sect. 5). Hébrard et al., 2008, A&A 488, 763 Fig. 7. Residuals of the Rossiter-McLaughlin effect fits. Top: without transit. Middle: λ = 0 (spin-orbit alignment). Bottom: λ = 70. The squares (open and filled) are the SOPHIE radial-velocity measurements of XO-3 with 1σ error bars as a function of the orbital phase. Only the first four measurements (filled squares) are used for the Keplerian fit (together with 19 measurements at other orbital phases; see Sect. 4.1). The vertical, dashed line shows the center of the transit. with the possible transverse Rossiter-McLaughlin effect we report here, though with a modest significance. The SOPHIE observation remains noisy, showing more dispersion around the fit during the transit than at other phases. We consider this result as a tentative detection of transverse transit rather than a firm detection. Indeed, the end of the transit was observed at high airmasses, which could possibly biases the radial velocity measurements. Our fits favor a transverse transit, but one cannot totally exclude a systematic error that would by chance mimic the shape of a transverse transit. This would imply that the radial velocities measured during the end of the transit night, at high airmasses, would be off by about 100 m s 1, i.e. three to four times the expected errors. Other spectroscopic transits of XO-3b should thus be observed. They will allow the transverse Rossiter-McLaughlin effect to be confirmed or not and to quantify its parameters better, such as the value of the misalignment angle λ. Narita et al. (2008) estimate that the timescale for spin-

39 Spin-orbit : probing the hot Jupiters dynamical origin Winn et al., 2010, ApJ Triaud et al., 2010, A&A 8 out 26 misaligned the creation of retrograde planets involves another body: planetary or stellar Trend with the M /Teff planet formation and migration depend on the stars mass or the final evolution is linked to the internal structure of the stars, specifically the depth of the outer convective zone

40 Transits : probing the atmosphere planet s phase variation albedo occultation atmospheric properties

41 Transits : planet s atmosphere CoRoT-1b Red LC : depth = ± % (4σ ) T = 2390 K +/- 90 geometric albedo < 0.20 Snellen et al., 2009, Nature CoRoT-1b : optical phase variation White LC : Depth = ± 0.006% (3.5 σ ) T p = /-140K Alonso et al., 2009a A&A CoRoT-2b White LC : Depth = ± 0.002% T p = /-100K geometric albedo < 0.12 Alonso et al., 2009b A&A CoRoT-2b

42 Transit : atmosphere composition In - off transit - transmission spectroscopy Na D lines : additional absorption during transit Charbonneau et al., 2002 Hydrogen detection in Lyman α - HST observations Planetary blowoff Vidal-Madjar et al., 2004

43 Transit : atmosphere composition 2 GJ1214b M p = / M Jup R p = / R Earth star : M4V at 3.6 and 4.5 microns with Spitzer flat transmission spectrum over the large wavelength domain cloud-free, metal rich atmosphere Désert J.-M. et al., 2011, ApJ 731

44 Transits : timing variation induced by an additional planet Csizmadia priv. com. Agol, E. et al., 2005, MNRAS, 359, 567

45 TTV first success : Kepler-11 system Lissauer et al., 2011, Nature 6 planets with orbital period between 10 & 118 days Radii : 2 to 4.5 R Masses from dynamics (but Kepler-11g)!

46 Probing the star s surface and understanding the star s activity stellar spots leave their imprints on the transits Rp/R = (3% larger) Average of 7 spots covered per transit spot size : Rp Temperature : 4600 to 5400 K (R =5625K) rise & decay ~ 30 days Czesla et al., 2009, A&A 505 Wolter et al., 2009, A&A 504 Silva-Valio et al., 2010, A&A 510

47 Moons, rings & others direct measure of the transit of a moon Theoretical study : Sartoretti & Schneider 1999, A&A Test on HD : moon or rings but a large spot complex (> km) Pont et al., 2007, A&A 476

48 Moons, rings & others Measure of the planet s oblateness & spin precession Carter et al., 2011, ApJ 730 Saturne oblateness : 200 ppm and 2 ppm for a synchronized hot Jupiter 5 Precession of an oblate oblique planet causes changes in the depth and duration of transits FIG. 4. Variations in the transit light curve due to an oblate, oblique, precessing exoplanet. Plotted are the transit depth (δ), total duration (T full ) and ingress duration (τ) fractional variations (TδV, TDV, and Tτ V, respectively) that are expected for a uniformly precessing Saturn-like planet around a Sun-like star. The time scale is based on the assumption P orb = 17.1 days.

49 Conclusions Transits : a powerful tool for characterizing planetary systems : fundamental parameters, orbit configuration.. constraints for their formation mechanism(s) and evolution Allow to enlarge the space parameters and to start physics studies Objectives : toward the small size planets and the long orbital periods Observations of bright targets are now required!

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