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PRODID:https://murmitoyen.com/events/vanille/udem/
X-WR-TIMEZONE:America/Montreal
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UID:69dae7cc912f4
DTSTAMP:20260411T203108
DTSTART:20180208T113000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20180208T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/807098-brown-dwarf-di
 stances-and-atmospheres-spitzer-parallaxes-and-the-kecknirspec-upgrade-emi
 ly-martin-ucla
LOCATION:Pavillon Roger-Gaudry \, 2900\, boul. Édouard-Montpetit\, Local M
 -415\, Montréal\, QC\, Canada
SUMMARY:Brown dwarf distances and atmospheres: Spitzer Parallaxes and the K
 eck/NIRSPEC upgrade - Emily Martin (UCLA)
DESCRIPTION:Résumé
Advances in infrared technology have been essential to
 wards improving our understanding of the solar neighborhood\, revealing a 
 large population of brown dwarfs\, which span the mass regime between plan
 ets and stars. My thesis combines near-infrared (NIR) spectroscopic and as
 trometric analysis of nearby low-mass stars and brown dwarfs with instrume
 ntation work to upgrade the NIRSPEC instrument for the Keck II Telescope. 
 I will present results from a program using Spitzer/IRAC data to measure p
 recise locations and distances to 22 of the coldest and closest brown dwar
 fs. These distances allow us to constrain absolute physical properties\, s
 uch as mass\, radius\, and age\, of free-floating planetary-mass objects t
 hrough comparison to atmospheric and evolutionary models. NIR spectroscopy
  combined with the Spitzer photometry reveals a detailed look into the atm
 ospheres of brown dwarfs and gaseous extrasolar planets. Additionally\, I 
 will discuss the improvements we are making to the NIRSPEC instrument at K
 eck. NIRSPEC is a NIR echelle spectrograph\, capable of R~2000 and R~25\,0
 00 observations in the 1-5 μm range. As part of the upgrade\, I performed
  detector characterization\, optical design of a new slit-viewing camera\,
  mechanical testing\, and electronics design. NIRSPEC’s increased effici
 ency will allow us to obtain moderate- and high-resolution NIR spectra of 
 objects up to a magnitude fainter than the current NIRSPEC design. Finally
 \, I will demonstrate the utility of a NIR laser frequency comb as a high-
 resolution calibrator. This new technology will revolutionize precision ra
 dial velocity measurements in the coming decade. 
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TZID:America/Montreal
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