The ASAS-SN catalogue of variable stars X: discovery of 116 000 new variable stars using G-band photometry
Abstract
The All-Sky Automated Survey for Supernovae (ASAS-SN) is the first optical survey to monitor the entire sky, currently with a cadence of ≲ 24 h down to g ≲ 18.5 mag. ASAS-SN has routinely operated since 2013, collecting ~ 2 000 to over 7 500 epochs of V- and g-band observations per field to date. This work illustrates the first analysis of ASAS-SN's newer, deeper, and higher cadence g-band data. From an input source list of ~55 million isolated sources with g < 18 mag, we identified 1.5 × 106 variable star candidates using a random forest (RF) classifier trained on features derived from Gaia, 2MASS, and AllWISE. Using ASAS-SN g-band light curves, and an updated RF classifier augmented with data from Citizen ASAS-SN, we classified the candidate variables into eight broad variability types. We present a catalogue of ~116 000 new variable stars with high-classification probabilities, including ~111 000 periodic variables and ~5 000 irregular variables. We also recovered ~263 000 known variable stars.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- March 2023
- DOI:
- 10.1093/mnras/stac3801
- arXiv:
- arXiv:2205.02239
- Bibcode:
- 2023MNRAS.519.5271C
- Keywords:
-
- catalogues;
- surveys;
- stars: variables: general;
- binaries: eclipsing;
- stars: rotation;
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 18 pages, 21 figures, 1 table. Submitted to MNRAS. The g-band catalog of variables and their light curves are available here: https://drive.google.com/drive/folders/1gxcIokRsw1eyPmbPZ0-C8blfRGItSOAu