Extreme Stellar Signals Project IV
The Extreme Stellar Signals Project (ESSP) is an international research network of scientists working to mitigate stellar signals for improved radial velocity (RV) planet searches. This website describes the fourth round of ESSP work.
Those interested in joining can e-mail lilylingzhao[at]uchicago.edu or fill out this form at any time.
This page discuses the intended purpose of ESSP IV, gives the most up-to-date timeline, and lists any significant changes to be aware of. There is also an optionally anonymous form for feedback/questions.
The intended purpose of ESSP IV is:
To what degree do different techniques succeed in separating out stellar signals and instrumental variation from planetary signals in a realistic observing case ?
Hover over orange, underlined words for more details.
Timeline
The projected timeline throughout 2025 and into 2026 is as follows:
| Jan 30 | Meeting: (11 ET; 17 CET) introduce ESSP IV and intended scope () | ||||||
| May 5 | Data Release: initial data products | ||||||
| May 16 |
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| May |
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| Jun 13 | Submission: feedback on initital data products | ||||||
| Jul 31 | Data Release: all nine full data sets released | ||||||
| Sep 8 | Check-In: individual e-mails sent to each team | ||||||
| Oct 31 |
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| Feb | Meeting: discuss final report | ||||||
| Mar | Draft of final report shared with participants | ||||||
| Apr | Submit final report |
Change Log
October 9, 2025: CCF FWHM/Contrast values for all instruments have been corrected (read more). All HARPS/HARPS-N data have been heliocentric corrected (read more). Please download the new data here. The deadline for submissions has consequently been moved from Oct 15 to Oct 31.
July 31, 2025: All data sets uploaded. Added merged spectra. Debugged CCF pipeline, now iCCF based. New discussion on intrinsic instrument offsets.
May 30, 2025: Changed feedback requested for the initial data release. Deadline is now June 13.
May 29, 2025: Minor changes made to example code notebooks. Redownload for clearer example figures and directory definition.
May 21, 2025: Updated time series and CCF files for the initial data set. The old files contained a bug with the ESSP-derived NEID CCF errors. Please re-download DS1_timeseries.csv and NEID CCF files (~75 files) if they were downloaded before this date.