Multifilter Transit Observations of WASP-39b and WASP-43b with Three San Pedro Mártir Telescopes

Journal
Date Issued
2015
Author(s)
•
Ramón-Fox, F. G.
•
Ayala-Loera, C.
•
Michel, R.
•
Navarro-Meza, S.
•
Fox-Machado, L.
•
Reyes-Ruiz, M.
•
Brown Sevilla, S.
•
Curiel, S.
DOI
Description
Research carried out thanks to the support of UNAM-DGAPA-PAPIIT project IN115413. FGRF acknowledges the support of a CONACYT scholarship for postgraduate studies in Mexico. We also acknowledge Dr. Wolfgang Steffen Burg for the discussion about future exoplanetary-related projects, John Southworth for his useful comments about the form and the content of this manuscript, and the OAN technical and service staff for daily support. We finally acknowledge the anonymous referee for the useful remarks. Facilities: San Pedro Mrtir 0.84m (MEXMAN), San Pedro Mrtir 1.50m (RATIR), San Pedro Mrtir 2.12m (direct imaging mode).
Abstract
Three optical telescopes located at the San Pedro Mártir National Observatory were used for the first time to obtain multi-filter defocused photometry of the transiting extrasolar planets WASP-39b and WASP-43b. We observed WASP-39b with the 2.12m telescope in the U filter for the first time, and additional observations were carried out in the R and I filters using the 0.84m telescope. WASP-43b was observed in VRI with the same instrument, and in the i filter with the robotic 1.50m telescope. We reduced the data using different pipelines and performed aperture photometry with the help of custom routines, in order to obtain the light curves. The fit of the light curves (1.5--2.5mmag rms), and of the period analysis, allowed a revision of the orbital and physical parameters, revealing for WASP-39b a period ($4.0552947 \pm 9.65 \times 10^{-7}$ days) which is $3.084 \pm 0.774$ seconds larger than previously reported. Moreover, we find for WASP-43b a planet/star radius ($0.1738 \pm 0.0033$) which is $0.01637 \pm 0.00371$ larger in the i filter with respect to previous works, and that should be confirmed with additional observations. Finally, we confirm no evidence of constant period variations in WASP-43b.
Volume
127
Issue
948
Start page
143
Uri
Url
Issn Identifier
0004-6280
Ads BibCode
2015PASP..127..143R
Rights
open.access
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