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SUMMARY:Towards Characterizing Atmospheres of Terrestrial Planets
DTSTART;VALUE=DATE-TIME:20220909T080000Z
DTEND;VALUE=DATE-TIME:20220909T081500Z
DTSTAMP;VALUE=DATE-TIME:20240704T115922Z
UID:indico-contribution-117@meetings.aip.de
DESCRIPTION:Speakers: Ray Jayawardhana (Cornell University)\nWe aim to cha
 racterize transiting exoplanets spanning a wide range of sizes\, masses an
 d effective temperatures using a variety of high-resolution spectrographs\
 , including through our on-going Gemini Large Program “Exploring the Div
 ersity of Exoplanet Atmospheres at High Spectral Resolution” (ExoGemS\, 
 for short) with Gemini-N/GRACES. Here I will share a few early results fro
 m ExoGems\, and present our new\, complementary study of GJ 486b\, a 1.3-E
 arth-radius planet around a nearby M dwarf. Given its high transmission sp
 ectroscopy metrics\, GJ 486b is a compelling target for constraining an at
 mosphere in the terrestrial size regime.  We observed three planetary tran
 sits with Subaru/IRD\, Gemini-S/IGRINS and CFHT/SPIRou\, and searched for 
 absorption by a multitude potential atmospheric species. We are able to ru
 le out a H/He-dominated atmosphere with solar abundances to a confidence o
 f >5σ and a 100% water atmosphere to a confidence of 3σ. We also investi
 gate the implications of our results for the upcoming JWST transit observa
 tions of GJ 486b. Our findings suggest that terrestrial planets orbiting M
 -dwarf stars may experience significant atmospheric loss.\n\nhttps://meeti
 ngs.aip.de/event/16/contributions/117/
LOCATION:Leibniz Institute for Astrophysics Potsdam (AIP) Lecture Hall
URL:https://meetings.aip.de/event/16/contributions/117/
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