The SARS algorithm: detrending CoRoT light curves with Sysrem using simultaneous external parameters

By A. Ofir, R. Alonso, A. Bonomo, L. Carone, S. Carpano, B. Samuel, J. Weingrill, Suzanne Aigrain, M. Auvergne, A. Baglin and 24 more. 2010

36 citations recorded by the source corpus.

Surveys for exoplanetary transits are usually limited not by photon noise but rather by the amount of red noise in their data. In particular, although the CoRoT space-based survey data are being carefully scrutinized, significant new sources of systematic noises are still being discovered. Recently, a magnitude-dependant systematic effect was discovered in the CoRoT data by Mazeh et al. and a phenomenological correction was proposed. Here we tie the observed effect to a particular type of effect, and in the process generalize the popular Sysrem algorithm to include external parameters in a simultaneous solution with the unknown effects. We show that a post-processing scheme based on this algorithm performs well and indeed allows for the detection of new transit-like signals that were not previously detected.

Subfields: Astronomy and Astrophysics, Instrumentation

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. J. Irwin
2. D. Charbonneau
3. C. Burke
4. Z. K. Berta
5. Emilio E. Falco
6. Jon Fortney
7. N. Madhusudhan
8. Sara Seager

In Instrumentation

1. D. Charbonneau
2. J. Irwin
3. C. Burke
4. Emilio E. Falco
5. Z. K. Berta
6. Jon Fortney
7. Sara Seager
8. J. Winn

Citations in the corpus

• TRANSIT DETECTION IN THE MEarth SURVEY OF NEARBY M DWARFS: BRIDGING THE CLEAN-FIRST, SEARCH-LATER DIVIDE (2012, methodology): “Methods 7 that include known physical effects through linear models of externally measured variables (Bakos et al. 2010; Ofir et al. 2010) are more helpful for MEarth-like data.”