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SUMMARY:Keck/KPIC Emission Spectroscopy of WASP-33b
DTSTART;VALUE=DATE-TIME:20220907T131500Z
DTEND;VALUE=DATE-TIME:20220907T133000Z
DTSTAMP;VALUE=DATE-TIME:20240704T115911Z
UID:indico-contribution-135@meetings.aip.de
DESCRIPTION:Speakers: Luke Finnerty (UCLA)\nWe present Keck/KPIC high-reso
 lution ($R\\sim35\,000$) $K$-band thermal emission spectroscopy of the ult
 ra-hot Jupiter WASP-33b. The use of KPIC's single-mode fiber greatly impro
 ves both blaze and line-spread stabilities relative to slit spectrographs\
 , enhancing the cross-correlation detection strength. We perform separate 
 retrievals for the dayside and nightside emission spectra with a cross-cor
 relation-to-logL nested sampling pipeline which fits for orbital parameter
 s\, the atmospheric pressure-temperature profile\, and molecular abundance
 s. While the dayside shows a thermal inversion which is absent on the nigh
 tside\, we measure consistent CO and H$_2$O abundances for both hemisphere
 s (nightside $\\log\\rm H_2O_{MMR} = -3.3^{+0.9}_{-0.6}$\, $\\log\\rm CO_{
 MMR} = -1.5^{+0.9}_{-0.6}$ versus dayside $\\log\\rm H_2O_{MMR} = -4^{+1}_
 {-1}$\, $\\log\\rm CO_{MMR} = -2^{+1}_{-1}$)\, suggesting limited dayside 
 H$_2$O dissociation at the pressures probed. The retrieved abundances sugg
 est a carbon- and possibly metal-enriched atmosphere\, with a gas-phase C/
 O ratio of $1.0\\pm0.1$\, consistent with the accretion of high-metallicit
 y gas near the CO$_2$ snow line and post-disk migration. The dayside hemis
 phere shows a systemic redshift compared to the nightside in excess of WAS
 P-33b's rotation speed\, suggesting day-to-night winds may be contributing
  to the offset.  We also find tentative evidence for $\\rm ^{13}CO/^{12}CO
  \\sim 40$\, consistent with values expected in protoplanetary disks. Thes
 e observations demonstrate KPIC's ability to characterize close-in planets
  and the utility of KPIC's improved instrumental stability for cross-corre
 lation techniques.\n\nhttps://meetings.aip.de/event/16/contributions/135/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://meetings.aip.de/event/16/contributions/135/
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