Kepler-424 b: a 'lonely' hot Jupiter that found a companion

Endl, Michael and Caldwell, Douglas A. and Barclay, Thomas and Huber, Daniel and Isaacson, Howard and Buchhave, Lars A. and Brugamyer, Erik and Robertson, Paul and Cochran, William D. and MacQueen, Phillip J. and Havel, Mathieu and Lucas, Phillip and Howell, Steve B. and Fischer, Debra and Quintana, Elisa and Ciardi, David R. (2014) Kepler-424 b: a 'lonely' hot Jupiter that found a companion. The Astrophysical Journal, 795 (2). pp. 151-163. ISSN 0004-637X

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Hot Jupiter systems provide unique observational constraints for migration models in multiple systems and binaries. We report on the discovery of the Kepler-424 (KOI-214) two-planet system, which consists of a transiting hot Jupiter (Kepler-424b) in a 3.31 day orbit accompanied by a more massive outer companion in an eccentric (e = 0.3) 223 day orbit. The outer giant planet, Kepler-424c, is not detected transiting the host star. The masses of both planets and the orbital parameters for the second planet were determined using precise radial velocity (RV) measurements from the Hobby-Eberly Telescope (HET) and its High Resolution Spectrograph (HRS). In stark contrast to smaller planets, hot Jupiters are predominantly found to be lacking any nearby additional planets; they appear to be 'lonely'. This might be a consequence of these systems having a highly dynamical past. The Kepler-424 planetary system has a hot Jupiter in a multiple system, similar to Andromedae. We also present our results for Kepler-422 (KOI-22), Kepler-77 (KOI-127), Kepler-43 (KOI-135), and Kepler-423 (KOI-183). These results are based on spectroscopic data collected with the Nordic Optical Telescope (NOT), the Keck 1 telescope, and HET. For all systems, we rule out false positives based on various follow-up observations, confirming the planetary nature of these companions. We performed a comparison with planetary evolutionary models which indicate that these five hot Jupiters have heavy element contents between 20 and 120 M⊕.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 02 Jun 2017 07:21
Last Modified: 27 Jun 2017 04:42
Uncontrolled Keywords: planetary systems; stars: individual (KOI-22, KOI-127, KOI-135, KOI-183, KOI-214, Kepler-43, Kepler-77); 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/795/2/151

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