Qatar-2: A K Dwarf Orbited by a Transiting Hot Jupiter and a more Massive Companion in an Outer Orbit
Abstract
We report the discovery and initial characterization of Qatar-2b, a hot Jupiter transiting a V = 13.3 mag K dwarf in a circular orbit with a short period, P_b = 1.34 days. The mass and radius of Qatar-2b are M_P = 2.49 M_J and R_P = 1.14 R_J, respectively. Radial-velocity monitoring of Qatar-2 over a span of 153 days revealed the presence of a second companion in an outer orbit. The Systemic Console yielded plausible orbits for the outer companion, with periods on the order of a year and a companion mass of at least several M_J. Thus, Qatar-2 joins the short but growing list of systems with a transiting hot Jupiter and an outer companion with a much longer period. This system architecture is in sharp contrast to that found by Kepler for multi-transiting systems, which are dominated by objects smaller than Neptune, usually with tightly spaced orbits that must be nearly coplanar.
Additional Information
© 2012 The American Astronomical Society. Received 2011 October 21; accepted 2012 February 19; published 2012 April 17. G.F. acknowledges financial support from the Hungarian OTKA-NFU Mobility grant MB08C 81013. C.L. acknowledges the Qatar Foundation for support from QNRF grant NPRP-09-476-1-078. D.R. (boursier FRIA) acknowledges support from the Communauté française de Belgique—Actions de recherche concertées—Académie universitaire Wallonie-Europe. The Byrne Observatory at Sedgwick (BOS) is operated by the Las Cumbres Observatory Global Telescope Network and is located at the Sedgwick Reserve, a part of the University of California Natural Reserve System. We thank the anonymous referee for several helpful suggestions for improving the clarity of the manuscript and the interpretation of the results. Facility: FLWO:1.5m (TRES) - Fred Lawrence Whipple Observatory's 1.5 meter Telescope.Errata
When the discovery paper was published, residuals from the 1.34 day orbital solution indicated a companion with several possible periods. With additional radial velocity measurements over the following months, the authors became concerned that the period of the outer planet was converging on one year. After checking for potential sources of error, the authors determined that there was an error in the barycentric correction, and that the outer planet was a detection of Earth's orbital motion. Qatar-2 was the first target observed by TRES with negative declination, and this uncovered a bug in the code that parsed the sexigesimal declination—the minutes and seconds of arc were parsed as positive instead of negative. This resulted in a low amplitude modulation of the barycentric correction due to Earth's motion around the Sun. No other published result from TRES is affected by this error. A reanalysis using the correct barycentric velocity shows that the orbital solution for Qatar-2b is unchanged from the results published in the discovery paper.Attached Files
Published - Bryan_2012_ApJ_750_84.pdf
Submitted - 1110.5912.pdf
Erratum - Bryan_2014_ApJ_782_121.pdf
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Additional details
- Eprint ID
- 88857
- Resolver ID
- CaltechAUTHORS:20180816-105849902
- MB08C 81013
- Hungarian Scientific Research Fund (OTKA)
- NPRP-09-476-1-078
- Qatar National Research Foundation
- Communauté française de Belgique – Actions de recherche concertées – Académie universitaire Wallonie-Europe
- Created
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2018-08-16Created from EPrint's datestamp field
- Updated
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2023-06-01Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)