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DTSTART;TZID=Europe/Paris:20251204T123000
DTEND;TZID=Europe/Paris:20251204T133000
DTSTAMP:20260422T100438
CREATED:20251030T103159Z
LAST-MODIFIED:20251204T123759Z
UID:27976-1764851400-1764855000@www.iaa.csic.es
SUMMARY:SO Colloquium: The Earth 2.0 (ET) Space Mission
DESCRIPTION:The Earth 2.0 (ET) mission\, currently in Phase B and scheduled for launch in fall 2028\, aims to discover Earth-like exoplanets using a dedicated space observatory at the Earth-Sun L2 point. It will combine six wide-field transit telescopes and one microlensing telescope\, leveraging large-format CMOS detectors for ultra-precise photometry. Over its four-year primary mission\, ET will monitor ~3 million nearby dwarf stars for transits and ~30 million stars in the Galactic bulge for microlensing events. Simulations suggest the mission will detect ~17 Earth 2.0 analogs\, ~25 free-floating Earth-mass planets\, over 4000 terrestrial-like planets\, and tens of thousands of additional exoplanets. \nThis talk will present an overview of the mission design\, technical innovations\, and its potential for exoplanet\, stellar and time-domain sciences. \nFecha y lugar: 04/12/2025 – 12:30 | Salón de ActosJian GeShanghai Astronomical Observatory \n  \n 
URL:https://www.iaa.csic.es/evento/the-earth-2-0-et-space-mission/
LOCATION:IAA – CSIC\, Glorieta de la Astronomía\, Granada\, España
CATEGORIES:Seminarios,SO Colloquium
ATTACH;FMTTYPE=image/png:https://www.iaa.csic.es/wp-content/uploads/2025/07/SO-COLLOQUIUM.png
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251209T123000
DTEND;TZID=Europe/Paris:20251209T133000
DTSTAMP:20260422T100438
CREATED:20251015T110641Z
LAST-MODIFIED:20260107T100028Z
UID:27740-1765283400-1765287000@www.iaa.csic.es
SUMMARY:SO Colloquium: Planetesimal vs. Pebble Accretion
DESCRIPTION:A major issue in planet formation theory is whether the terrestrial planets formed mostly by accreting asteroid-sized (~100 km) planetesimals\, or mostly by accreting small (~cm) pebbles. In either theory\, planetesimals are the first steps in formation\, and these may accrete into Mars-sized planets within the ≈2 Myr lifetime of the inner disk. Pebble accretion has been rejected for various reasons\, but those reasons don’t actually discriminate between the theories. One objection is that even mm-sized objects are commonly thought to drift into the Sun in < 2 Myr due to aerodynamic drag. This would prevent terrestrial planets from accreting pebbles with «NC» (inner-disk) isotopic composition. But it would also be a problem for formation of planetesimal parent bodies of chondrites. \nHowever\, I’ll show that the combination of the pebble trap at the dead zone inner edge\, plus turbulent diffusion of chondrules\, is quite favorable for retention of chondrule-sized pebbles\, enabling both pebble accretion and planetesimal accretion. Another objection is the geochemical constraint from Hf-W dating that Earth’s core’s formed over ~10^8 yr\, consistent with planetesimal accretion. However\, nebular H\, He\, and Ne in Earth’s deep mantle demand ingassing into a magma ocean\, and rapid core formation in ~ 10^6 yr. This geochemical constraint demands the Earth’s Hf-W age was reset during the Moon-forming impact and does not discriminate between the scenarios. What might discriminate between the formation scenarios are moderately volatile element (MVE) abundances. Whereas Mars has MVE patterns consistent with planetesimal accretion of chondrites\, Earth is depleted in MVEs. I describe a scenario by which Earth’s embryos mostly grew by accretion of MVE-depleted chondrule-sized pebbles. While Mars might have grown from planetesimals\, growth of larger planets (proto-Earth\, possibly Theia and Venus\, and super-Earth exoplanets) likely is dominated by pebble accretion. \nFecha y lugar: 09/12/2025 – 12:30 | Salón de ActosSteve DeschArizona State University\, USA \n 
URL:https://www.iaa.csic.es/evento/so-colloquium-planetesimal-vs-pebble-accretion/
LOCATION:IAA – CSIC\, Glorieta de la Astronomía\, Granada\, España
CATEGORIES:Seminarios,SO Colloquium
ATTACH;FMTTYPE=image/png:https://www.iaa.csic.es/wp-content/uploads/2025/07/SO-COLLOQUIUM.png
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DTSTART;TZID=Europe/Paris:20251211T123000
DTEND;TZID=Europe/Paris:20251211T133000
DTSTAMP:20260422T100438
CREATED:20251002T110437Z
LAST-MODIFIED:20260107T100033Z
UID:27568-1765456200-1765459800@www.iaa.csic.es
SUMMARY:SO Colloquium:  MOSAIC: the multi-object spectrograph for the ELT
DESCRIPTION:MOSAIC will be a multi-object spectrograph for the ELT. It is being designed to work at visible and NIR wavelengths\, and with different observing modes. During the first years of operation of the instrument it will carry out several surveys that will focus on the most relevant key-projects in Astronomy: first galaxies\, mass assembly along the Universe evolution\, exoplanets\, etc… \nThe IAA-CSIC is contributing to the development of the instrument\, as well as to the scientific team that is defining the first observations. The Principal Investigator of the project will update the progress of the project\, both from the technological and scientific points of view. \nFecha y lugar: 11/12/2025 – 12:30 | Salón de ActosRoser PellóLaboratoire d’astrophysique de Marseille (LAM) \n 
URL:https://www.iaa.csic.es/evento/mosaic-the-multi-object-spectrograph-for-the-elt/
LOCATION:IAA – CSIC\, Glorieta de la Astronomía\, Granada\, España
CATEGORIES:Seminarios,SO Colloquium
ATTACH;FMTTYPE=image/png:https://www.iaa.csic.es/wp-content/uploads/2025/07/SO-COLLOQUIUM.png
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