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The HD 192263 System: Planetary Orbital Period and Stellar Variability Disentangled

Dragomir, Diana and Kane, Stephen R. and Henry, Gregory W. and Ciardi, David R. and Fischer, Debra A. and Howard, Andrew W. and Jensen, Eric L. N. and Laughlin, Gregory and Mahadevan, Suvrath and Matthews, Jaymie M. and Pilyavsky, Genady and von Braun, Kaspar and Wang, Sharon X. and Wright, Jason T. (2012) The HD 192263 System: Planetary Orbital Period and Stellar Variability Disentangled. Astrophysical Journal, 754 (1). Art. No. 37. ISSN 0004-637X.

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As part of the Transit Ephemeris Refinement and Monitoring Survey, we present new radial velocities and photometry of the HD 192263 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 HD 192263b, a Jupiter-mass planet with a period of 24.3587 ± 0.0022 days. We use 10 years 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 23.4 days. 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 ∼23 day variability to stellar rotation. There are also indications of spot variations on longer (8 years) timescales. Finally, we use the photometric data to exclude transits for a planet with the predicted radius of 1.09 R_J, and as small as 0.79 R_J.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Dragomir, Diana0000-0003-2313-467X
Kane, Stephen R.0000-0002-7084-0529
Henry, Gregory W.0000-0003-4155-8513
Ciardi, David R.0000-0002-5741-3047
Fischer, Debra A.0000-0003-2221-0861
Howard, Andrew W.0000-0001-8638-0320
Jensen, Eric L. N.0000-0002-4625-7333
Laughlin, Gregory0000-0002-3253-2621
Mahadevan, Suvrath0000-0001-9596-7983
Matthews, Jaymie M.0000-0002-4461-080X
von Braun, Kaspar0000-0002-5823-4630
Wang, Sharon X.0000-0002-6937-9034
Wright, Jason T.0000-0001-6160-5888
Additional Information:© 2012 The American Astronomical Society. Received 2012 January 17; accepted 2012 May 13; published 2012 July 3. We thank Victoria Antoci for insightful conversations on interpreting the stellar variability and the anonymous referee for suggestions which have significantly improved the paper. The authors acknowledge financial support from the National Science Foundation through grant AST-1109662. D.D. is supported by a University of British Columbia Four Year Fellowship. The Center for Exoplanets and Habitable Worlds is supported by the Pennsylvania State University, the Eberly College of Science, and the Pennsylvania Space Grant Consortium. G.W.H. acknowledges support from NASA, NSF, Tennessee State University, and the State of Tennessee through its Centers of Excellence program.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
University of British ColumbiaUNSPECIFIED
Tennessee State UniversityUNSPECIFIED
State of Tennessee Centers of Excellence ProgramUNSPECIFIED
Pennsylvania State UniversityUNSPECIFIED
Eberly College of ScienceUNSPECIFIED
Pennsylvania Space Grant ConsortiumUNSPECIFIED
Subject Keywords:planetary systems; stars: activity; stars: individual (HD 192263); starspots; techniques: photometric; techniques: radial velocities
Issue or Number:1
Record Number:CaltechAUTHORS:20120807-093738992
Persistent URL:
Official Citation:The HD 192263 System: Planetary Orbital Period and Stellar Variability Disentangled Diana Dragomir et al. 2012 ApJ 754 37
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32969
Deposited By: Aucoeur Ngo
Deposited On:07 Aug 2012 16:52
Last Modified:13 Dec 2019 03:43

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