A modified CoRoT detrend algorithm and the discovery of a new planetary companion

作者：Boufleur Rodrigo C^*; Emilio Marcelo^*; Janot Pacheco Eduardo; Andrade Laerte; Ferraz Mello Sylvio; do Nascimento Jose Dias Jr; de La Reza Ramiro

来源：Monthly Notices of the Royal Astronomical Society, 2018, 473(1): 710-720.

DOI：10.1093/mnras/stx2187

• methods: data analysis
• planets and satellites: detection
• stars: fundamental parameters

We present MCDA, a modification of the COnvection ROtation and planetary Transits (CoRoT) detrend algorithm (CDA) suitable to detrend chromatic light curves. By means of robust statistics and better handling of short-term variability, the implementation decreases the systematic light-curve variations and improves the detection of exoplanets when compared with the original algorithm. All CoRoT chromatic light curves (a total of 65 655) were analysed with our algorithm. Dozens of new transit candidates and all previously known CoRoT exoplanets were rediscovered in those light curves using a box-fitting algorithm. For three of the new cases, spectroscopic measurements of the candidates' host stars were retrieved from the ESO Science Archive Facility and used to calculate stellar parameters and, in the best cases, radial velocities. In addition to our improved detrend technique, we announce the discovery of a planet that orbits a 0.79(-0.09)(+0.08) R-circle dot star with a period of 6.71837 +/- 0.00001 d and has 0.57(-0.05)(+0.06) R-J and 0.15 +/- 0.10 M-J. We also present the analysis of two cases in which parameters found suggest the existence of possible planetary companions.

• 出版日期2018-1