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SUMMARY:Understanding Substellar Atmospheres Through Silicate Clouds
DTSTART;VALUE=DATE-TIME:20260625T050000Z
DTEND;VALUE=DATE-TIME:20260625T060000Z
DTSTAMP;VALUE=DATE-TIME:20260630T092100Z
UID:indico-event-5130@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: GENARO SUAREZ CASTRO (American Museum of Natural His
 tory)\n\nHost: Xianyu TanJoin Tencent Meeting：https://meeting.tencent.c
 om/dm/qZogLcL2MfwtMeeting ID: 177934240 (no password）Abstract:Atmospher
 ic clouds strongly shape the observed spectra of brown dwarfs and gas gian
 t exoplanets\, making them fundamental to understanding substellar atmosph
 eres. In particular\, silicate clouds are ubiquitous in warm brown dwarfs 
 and are now beginning to be detected in a growing number of hot exoplanet 
 atmospheres through JWST observations. In this talk\, I present new JWST a
 nd archival Spitzer mid-infrared spectra of cloudy brown dwarfs spanning a
  wide range of temperatures\, metallicities\, ages\, and viewing geometrie
 s. Using these data\, I investigate the formation\, composition\, evolutio
 n\, and spatial distribution of silicate clouds and their dependence on fu
 ndamental parameters. Key results include: (1) the onset and sedimentation
  of silicate clouds between ~2000–1300 K\, (2) evidence of complex grain
  chemistry such as iron-rich silicates\, (3) a concentration of silicate c
 louds at low latitudes\, leading to redder colors in equator-on objects\, 
 (4) an age dependence in the direct spectral signature produced by silicat
 e clouds\, (5) suppressed cloud formation at low metallicity\, and (6) a s
 trong anticorrelation between spectral features from gas molecules and gra
 in species. These results provide new insight into the role of clouds in s
 haping ultracool atmospheric spectra.Biography:Genaro Suárez is a postdoc
 toral researcher in the Department of Astrophysics at the American Museum 
 of Natural History (AMNH) and a member of the Brown Dwarfs in New York Cit
 y (BDNYC) research group. His research focuses on the atmospheres of giant
  exoplanets and brown dwarfs\, using both ground- and space-based telescop
 es to characterize their composition and physical properties. He earned hi
 s PhD in Astronomy from the National Autonomous University of Mexico (UNAM
 ) in 2019\, followed by a postdoctoral position at the University of Weste
 rn Ontario in Canada. He also studies the formation of brown dwarfs and st
 ars through the initial mass function and is very passionate about open-so
 urce software development and science communication.\n\nhttps://indico-tdl
 i.sjtu.edu.cn/event/5130/
URL:https://indico-tdli.sjtu.edu.cn/event/5130/
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