ge/ay133
DESCRIPTION
What have radial velocity surveys told us about (exo)-planetary science?. Ge/Ay133. Discovery space for indirect methods:. Radial velocity. Astrometry. ( r =distance to the star). Mayor, M. & Queloz, D. 1995, Nature, 378, 355. Udry, S. et al. 2002, A&A, 390, 26. - PowerPoint PPT PresentationTRANSCRIPT
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Ge/Ay133
What have radial velocity surveys told us about (exo)-planetary science?
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Discovery space for indirect methods:
Radial velocity
Astrometry
(r=distance to the star)
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Mayor, M. & Queloz, D. 1995, Nature, 378, 355
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Udry, S. et al. 2002, A&A, 390, 26
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Jovian planetsthrougout the0.05-5 AU region.
And…
Updated plots follow.
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No strong preference for orbital distances…
…except for a“pile up” of hotJupiters at P~3 days.
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Planetary characteristics? Some trend in M versus R (bias?), butbeyond 0.05-0.1 AU, little preference for low eccentricities:
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Eccentricities. II. Short Period Circularization
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Even with incompleteness, strong preference for ~Jovian mass:
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Stars are different, turnover at low mass!
“The brown dwarf desert”?
Does this tell usthat stars and planets formdifferently?
Orion IMF
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Is there an eccentricity preference w/mass? Not really…
Marcy, G. et al. 2005, astro-ph/0505003
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Is there an eccentricity preference w/mass? Not really, part II…
Butler, R.P. et al. 2006, ApJ, 646, 505
?
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Another clue as to formation: Planet formation efficiency correlates strongly with metallicity!
Fischer, D.A. & Valenti, J. 2005, ApJ, 622, 1102
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What about planet formation efficiency & stellar mass?
Johnson, J.A et al. 2007, ApJ, 665, 785
Radial velocity surveys mostly focused on Sun-like stars. Why?
ActiveChromospheres
Low-contrastLines
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What about planet formation efficiency & stellar mass?
Clever idea for highermass A stars:
Look at older systemsthat have evolvedoff the main sequence.
Johnson, J.A et al. 2007, ApJ, 665, 785
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Johnson, J.A et al. 2007, ApJ, 665, 785
What about planet formation efficiency & stellar mass?
Two preliminary findings (that are being tested with larger surveys):
1. Planet formation efficiency increases w/mass.
2. The proportion of hot Jupiters decreases w/mass (not observational bias).
M4 – K7 K5 – F8 F5 - A5
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What about planetary multiplicity? Complex doppler patterns:
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Summary of several of the known multiple planetary systems:
Marcy, G. et al. 2005, astro-ph/0505003
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A super earth & GJ 876? Rivera, E.J. et al. 2005, (see class web site)
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GJ 876 orbitsevolve with time (expected w/mutual perturbations)!
What about other systems?
Rivera, E.J. et al. 2005, (see class web site)
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A habitable super-Earth? The GJ 581(M3V) system:
Vogt, S.S. et al. 2010, (arXiv:1009.5733v1)
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HD 168443b: 7.2 Mj 58 daysc: 17 Mj 1739 days
=1/29.98 ?!30:1?
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HD 12661b: 2.3 Mj 263 daysc: 1.6 Mj 1444 days
=1/5.511:2?
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47 U Mab: 2.5 Mj 1089 daysc: 0.76 Mj 2594 days
=1/2.4
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Gleise 876b: 1.89 Mj 61 daysc: 0.56 Mj 30 days
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HD 37124b: 0.75 Mj 152 dc: 1.2 Mj 1495 d
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ups Andb: 0.69 Mj 4.6 dc: 1.9 Mj 241.5 dd: 3.75 Mj 1284 d
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HD 82943b: 1.63 Mj 444 dc: 0.88 222 d
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55 Cncb: .84 Mj 14.6 dc: 0.21 Mj 44.3 dd: 4 Mj 5360 d
3:1!
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What we know:- ~1% of solar-type stars have Hot Jupiters
-~7% of solar-type stars have >Mj planets in the “terrestrial planet” region. Extrapolation of currentincompeteness suggests >12% w/planets @ <20 AU.- multiple planetary systems are ~common
- planetary resonances are ~common
What can explain these properties?
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Disk-star- and protoplanet interactions lead to migration while the gas is present. Core- accretion?
Theory
1 AU at 140 pc subtends 0.’’007.
Jupiter (5 AU):V_doppler = 13 m/sV_orbit = 13 km/sSimulation G. Bryden, JPL
Thus, need to study objects in this phase…
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Core-accretion models can now be compared to observations:
Planetsversusmetallicity:
Data
Observedin opencircles.
Ida, S. & Lin, D. 2004, ApJ, 616, 567
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Early disk models held that eccentricities were DAMPED. Not so fast…
Goldreich & Sari 2005
Need aninitiale~0.01.
Goldreich, P. & Sari, R. 2003, ApJ, 585, 1024