Mission Overview

A PSF-Based Approach to TESS High Quality Data Of Stellar Clusters (PATHOS)

Primary Investigator: Domenico Nardiello

HLSP Authors: Domenico Nardiello

Released: 2019-10-09

Updated: 2019-10-09

Primary Reference(s): Nardiello et al. 2019

Overview

The PATHOS project provides a database of high-precision light curves for members of stellar clusters, obtained by extracting photometry from TESS Full Frame Images. Light curves are obtained with an innovative PSF-based approach, that involves the use of empirical Point Spread Functions (PSFs), a high-angular resolution input catalogue (Gaia DR2) and neighbor-subtraction. The PSF-based approach minimises the dilution effects in crowded environments, enabling extraction of high-precision photometry for stars in the faint regime (T > 13).  The PATHOS database contains all the light curves extracted during the project, as well as light curves requested for other projects. Light curves of specific targets can be requested by contacting the project managers.

The first release contains light curves for targets in Sector 1 only.

Data Products

Each target has a FITS and TXT version of the light curves available.  The files are stored in sub-directories based on the Sector they are in as a 4-digit, zero-padded number, e.g., "s0001/" for Sector 1.  The data file naming convention is:

hlsp_pathos_tess_lightcurve_tic-<ticid>-<sector>_tess_v1_<ext>

where:

• <ticid> = The 10-digit, zero-padded TIC ID of the target
• <sector> = The Sector number as a 4-digit, zero-padded value, e.g., "s0001" for Sector 1
• <ext> = The data file type extension

Data file types:

 _llc.fits The light curve file in FITS format. _llc.txt The light curve file in TEXT format.

The available columns include the raw fluxes from the PSF-based approach and four different aperture sizes (PSF_FLUX_RAW, AP{1,2,3,4}_FLUX_RAW) and the corrected fluxes (PSF_FLUX_COR, AP{1,2,3,4}_FLUX_COR).  The TIME column is in barycentric-corrected, truncated TESS Julian Date (BJD - 2457000.0).

Data Access

from astroquery.mast import Observations
sector_num = '1'
print('Querying for PATHOS Sector ' + sector_num + " Observations...")
obsTable = Observations.query_criteria(provenance_name = "PATHOS",
sequence_number = sector_num)
print("Found a total of " + str(len(obsTable)) + " PATHOS targets.")
for obs in obsTable:
data_products = Observations.get_product_list(obs)
Observations.download_products(data_products)

MAST Portal

A web-based interface for cross-mission searches of data at MAST or the Virtual Observatory. Download PATHOS light curves for a few targets.

MAST Astroquery

Search for, and retrieve, PATHOS data products programmatically based on a list of coordinates or target names.

Citations

Please remember to cite the appropriate paper(s) below and the DOI if you use these data in a published work.

Note: These HLSP data products are licensed for use under CC BY 4.0.