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TZID:Europe/Paris
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UID:51@osups.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20260115T110000
DTEND;TZID=Europe/Paris:20260115T120000
DTSTAMP:20251210T123713Z
URL:https://osups.universite-paris-saclay.fr/calendrier/validation-charact
 erization-and-populations-of-mostly-small-exoplanets/
SUMMARY:Validation\, Characterization and Populations of (mostly) small exo
 planets
DESCRIPTION:par Léna PARC (Obs.de Genève)\n\nAbstract : \nIn this semina
 r\, I will present an overview of my PhD work on the characterization of 
 exoplanets\, with a focus on understanding the diversity of small planets.
  I will introduce the PlanetS catalog\, a curated sample of transiting pla
 nets with precise masses and radii. Using this catalog\, we show that the 
 transition between rocky super-Earths and volatile-rich sub-Neptunes aroun
 d M-dwarfs is smoother than previously thought\, with the radius valley be
 coming less pronounced. The transition also depends on stellar type\, refl
 ecting differences in formation and evolution.\nI will highlight the role 
 of high-precision spectrographs such as NIRPS\, HARPS\, and ESPRESSO in ex
 panding the sample of well-characterized small planets. The TOI-756 system
  illustrates this: we confirmed the transiting sub-Neptune TOI-756 b\, dis
 covered an outer eccentric giant planet\, and detected hints of an additio
 nal companion\, showcasing the complex architectures around M-dwarfs. I wi
 ll also discuss multi-planet systems TOI-4336 A and TOI-4342\, whose preci
 se masses and densities from ESPRESSO radial velocities reveal a range of 
 compositions from rocky to volatile-rich\, and are excellent targets for f
 uture JWST atmospheric studies.\nFinally\, I will present results from the
  long-term CORALIE programs\, which follow transiting planets to search fo
 r additional companions and better understand system architectures. \nOve
 rall\, this seminar illustrates how combining precise validation\, charact
 erization\, and population studies provides insights into the formation\, 
 evolution\, and diversity of exoplanets.\nLieu : IAS\, salle 1-2-3\n\n
CATEGORIES:Séminaires
LOCATION:IAS\, Bât. 121 rue Jean Teillac\, Orsay\, 91400\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Bât. 121 rue Jean Teillac\
 , Orsay\, 91400\, France;X-APPLE-RADIUS=100;X-TITLE=IAS:geo:0,0
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TZID:Europe/Paris
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DTSTART:20251026T020000
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