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Demo tool for creating a Systematics-insensitive Periodogram (SIP) to detect long period rotation in NASA's TESS mission data.

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TESS SIP

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Tool for creating a Systematics-insensitive Periodogram (SIP) to detect long period rotation in NASA's TESS mission data. Read more about TESS-SIP in our published Research Note of the American Astronomical Society.

What is SIP

SIP is a method of detrending telescope systematics simultaneously with calculating a Lomb-Scargle periodogram. You can read a more in-depth work of how SIP is used in NASA's Kepler/K2 data here.

Usage

This repository contains a Python tool to create a SIP. An example of a SIP output is below. You can run a simple notebook in the docs folder to show how to use SIP.

from tess_sip import SIP
import lightkurve as lk
# Download target pixel files
tpfs = lk.search_targetpixelfile('TIC 288735205', mission='tess').download_all()
# Run SIP
r = SIP(tpfs)

r is a dictionary containing all the information required to build a plot like the one below.

Example SIP output

Installation

You can pip install this tool:

pip install tess_sip

Requirements

To run this demo you will need to have lightkurve installed, with a minimum version number of v2.0.

Acknowledgements

This tool uses the lightkurve tool to build a SIP, and relies on the RegressionCorrector and SparseDesignMatrix lightkurve tools. The SIP project was developed in part at the online.tess.science meeting, which took place globally in 2020 September. This research made use of Astropy a community-developed core Python package for Astronomy.

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