The HD 192263 system: Planetary orbital period and stellar variability disentangled

Diana Dragomir, Stephen R. Kane, Gregory W. Henry, David R. Ciardi, Debra A. Fischer, Andrew W. Howard, Eric L.N. Jensen, Gregory Laughlin, Suvrath Mahadevan, Jaymie M. Matthews, Genady Pilyavsky, Kaspar Von Braun, Sharon X. Wang, Jason T. Wright

Research output: Contribution to journalReview articlepeer-review

21 Scopus citations


As part of the Transit Ephemeris Refinement and Monitoring Survey, we present new radial velocities and photometry of the HD192263 system. Our analysis of the already available Keck-HIRES and CORALIE radial velocity measurements together with the five new Keck measurements we report in this paper results in improved orbital parameters for the system. We derive constraints on the size and phase location of the transit window for HD192263b, a Jupiter-mass planet with a period of 24.3587 ± 0.0022days. We use 10years of Automated Photoelectric Telescope photometry to analyze the stellar variability and search for planetary transits. We find continuing evidence of spot activity with periods near 23.4days. The shape of the corresponding photometric variations changes over time, giving rise to not one but several Fourier peaks near this value. However, none of these frequencies coincides with the planet's orbital period and thus we find no evidence of star-planet interactions in the system. We attribute the ∼23day variability to stellar rotation. There are also indications of spot variations on longer (8years) timescales. Finally, we use the photometric data to exclude transits for a planet with the predicted radius of 1.09 RJ , and as small as 0.79 RJ.

Original languageEnglish (US)
Article number37
JournalAstrophysical Journal
Issue number1
StatePublished - Jul 20 2012

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'The HD 192263 system: Planetary orbital period and stellar variability disentangled'. Together they form a unique fingerprint.

Cite this