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SUMMARY:The future of ground-based Astronomy?  (from a transit hunting per
 spective) - Peter Pedersen (ETH Zurich)
DTSTART:20231121T130000Z
DTEND:20231121T140000Z
UID:TALK208243@talks.cam.ac.uk
CONTACT:Dr Emily Sandford
DESCRIPTION:In this talk\, I will focus on the methods for optimizing the 
 ground-based photometric precision for observing late M and L-type stars. 
 Specifically\, I will discuss a photometric atmospheric correction method 
 and share the lessons learned from introducing an InGaAs-based instrument 
 to the SPECULOOS Southern Observatory (SSO). The correction method targete
 d the induced effects from varying precipitable water vapor (PWV) in our a
 tmosphere\, on differentially resolved light curves. This work successfull
 y reduced false variability of time-series data from late M and L-type sta
 rs on both long and short timescales\, to the extent of removing false tra
 nsit features. Parallel to this work\, a feasibility study was conducted t
 o introduce a new near-infrared instrumentation to SSO. The goal was to ac
 hieve better photometric precision than the existing CCD Si-based instrume
 ntation while minimizing the induced effects of PWV variability. An InGaAs
 -based instrument\, sensitive up to 1.62 μm\, was identified. Additionall
 y\, a custom wide-pass filter called zYJ was designed and manufactured to 
 form SPeculoos' Infra-Red photometric Imager for Transits (SPIRIT). These 
 results open up a new avenue for ground-based near-infrared robotic exopla
 net transit surveys\, as well as similar time-series focused astronomy. In
  conclusion\, I suggest viable routes to further improve the photometric p
 recision of such new instrumentation.
LOCATION:Ryle seminar room + ONLINE - Details to be sent by email
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