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. The Astrophysical Journal, 754 (1). pp. 37-45. ISSN 0004-637X

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Abstract

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Astrophysical Journal
Faculty / Department / School: No Faculty
Date Deposited: 05 Jun 2017 22:54
Last Modified: 27 Jun 2017 04:32
Uncontrolled Keywords: planetary systems; stars: activity; individual stars (HD 192263); starspots; photometric techniques: radial velocities;
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1088/0004-637X/754/1/37
URI: http://eprints.usq.edu.au/id/eprint/32142

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