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SUMMARY:Testing the HARPS3 Data Reduction Pipeline with Synthetic Spectra 
 to achieve Earth-Twin RV Precision - Alicia Anderson (Cavendish Astrophysi
 cs)
DTSTART:20250513T101500Z
DTEND:20250513T110000Z
UID:TALK229495@talks.cam.ac.uk
CONTACT:Charles Walker
DESCRIPTION:The High Accuracy Radial velocity Planet Searcher-3 (HARPS3) i
 s being developed for the Terra Hunting Experiment\, a 10-year observing c
 ampaign to conduct nightly observations of a carefully selected group of s
 olar-like stars to detect long-period\, low-mass exoplanets. The goal is t
 o achieve extremely-precise radial velocity (EPRV) measurements at the lev
 el of 10 cm/s to enable the detection of an Earth-twin. Attaining this pre
 cision requires a deep understanding of all error sources: instrumental sy
 stematics\, astrophysical noise\, and data reduction algorithms.\n\nTo add
 ress the latter\, I have developed a novel method to test the data reducti
 on pipeline (DRP) using synthetic data. Rather than attempting to replicat
 e the instrument’s response exactly\, the method is designed to systemat
 ically probe the DRP’s performance\, identify potential biases\, and val
 idate the reduction algorithms. By injecting known inputs into the DRP and
  tracing their propagation\, I can control all aspects of the data\, test 
 specific algorithms\, and verify the accuracy of the reduction products. T
 he aim is to use simulated data to identify systematic biases and inaccura
 cies that could impact EPRV measurements.\n\nIn this talk I will present m
 y work\, currently in preparation for publication\, describing how I simul
 ate the data and discussing the first results of passing the synthetic ech
 ellogram through the DRP. This approach provides a framework to assess the
  performance of HARPS3 during commissioning and early operations - when it
  comes on-sky in late 2025 - enabling us to identify issues and refine dat
 a processing techniques.
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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