ExoFOP and the NASA Exoplanet Archive: Serving Exoplanetary Systems to the Community Julian van Eyken, Jessie Christiansen, Doug McElroy, David Ciardi, Megan Crane, John Good, Marcy Harbut, Aurora Kesseli, Mike Lund, Meca Lynn, Ricky Nilsson, Toba Oluyide, Mike Papin, Nick Susemiehl , Melanie Swain, Raymond Tam Caltech/IPAC-NExScI The Exoplanet Follow-up Observing Program (ExoFOP) and its sibling service, the NASA Exoplanet Archive, are NExScI’s two web-accessible databases dedicated to supporting the community in the study of exoplanets. Both build on the infrastructure and in-house experience of IPAC as a NASA data center. The ExoFOP website is designed to optimize resources and facilitate collaboration in follow-up studies of exoplanet candidates, serving as a repository for project and community-gathered data. The NASA Exoplanet Archive is NASA’s science archive for astronomical data on published exoplanets and their host stars. exofop.ipac.caltech.edu exoplanetarchive.ipac.caltech.edu ExoFOP The NASA Exoplanet Archive The publicly accessible NASA Exoplanet Archive collates data on confirmed exoplanets drawn from the published literature and from mission project deliveries, as well as contributed datasets. DATA • Parameters for over 5,700 published confirmed planets vetted by staff scientists, and 14,000 planet candidates • Regularly updated approx. every one to two weeks to keep up with newly published literature • Over 130 million additional photometric and radial velocity time series • Data from HST, JWST, Spitzer, TESS, Kepler/K2, SuperWASP, MOA, KELT, UKIRT, CoRoT, and more • Choice of parameters drawn from single or multiple references TOOLS • Interactive and programmatic tools for accessing, visualizing, and retrieving data: • Data tables can be filtered, searched, sorted, plotted, and downloaded in multiple formats. • System Overview pages centralize planet & host data. • Transit and Ephemeris Service predicts transit events observable from Earth and space, including JWST. • Interactive visualization of exoplanet transmission and emission spectra using IPAC-developed Firefly visualization library • EXOFAST MCMC transit & radial-velocity fitting • Predictions of exoplanet observable signatures • Pre-generated presentation plots • Periodogram service • IVOA TAP interface for standardized automated data retrieval ExoFOP facilitates science community follow-up observing. It enables users in the community to share data, files, and observing notes. Any user can access and download data, while users with registered accounts can also upload data. Originally designed to support Kepler and TESS, ExoFOP is now being adapted to handle custom target lists for other missions and community groups; the Habitable Worlds Observatory (HWO) target list is already available. • >1600 registered users: professionals and citizens scientists worldwide. • Approaching 1,000,000 user-uploaded data files, with tens to hundreds added daily. • Built on entire TESS Input Catalog (Gaia DR2): ~2-billion-star base catalog that covers the whole sky. • Primarily organized around recording photometric, imaging, and spectroscopic observations. • API interfaces available for download/upload; python- wrapped examples available; adapting to be IVOA compliant. • Related observations, data, files, notes can all be tied together with a “data-tag.” • Email notifications available for specific targets and daily updates. • Searches can be saved and tagged for reuse. Cumulative histogram of the number of files uploaded to ExoFOP by users over time. Currently around 150 files per day are uploaded on average. The large jump at the end of 2016 is a result of the K2 community sharing data; the jump around 2019 is a result of the ExoFOP being officially part of the TESS Follow-up Observing Program (TFOP) and general adoption of sharing by the community. 973,804 uploaded files 748,150 uploaded parameters 31,409 observing notes 25,641 spectroscopy observations 30,925 im