The McDonald observatory planet search: new long-period giant planets and two interacting Jupiters in the HD155358 system

Robertson, Paul and Endl, Michael and Cochran, William D. and MacQueen, Phillip J. and Wittenmyer, Robert A. and Horner, J. and Brugamyer, Erik J. and Simon, Attila E. and Barnes, Stuart I. and Caldwell, Caroline (2012) The McDonald observatory planet search: new long-period giant planets and two interacting Jupiters in the HD155358 system. The Astrophysical Journal, 749 (1). pp. 1-17. ISSN 0004-637X

[img]
Preview
Text (Published Version)
Robertson_etal_AJ_v749n1_PV.pdf

Download (1495Kb) | Preview

Abstract

We present high-precision radial velocity (RV) observations of four solar-type (F7-G5) stars - HD79498, HD155358, HD197037, and HD220773 - taken as part of the McDonald Observatory Planet Search Program. For each of these stars, we see evidence of Keplerian motion caused by the presence of one or more gas giant planets in long-period orbits. We derive orbital parameters for each system and note the properties (composition, activity, etc.) of the host stars. While we have previously announced the two-gas-giant HD155358 system, we now report a shorter period for planet c. This new period is consistent with the planets being trapped in mutual 2:1 mean-motion resonance. We therefore perform an in-depth stability analysis, placing additional constraints on the orbital parameters of the planets. These results demonstrate the excellent long-term RV stability of the spectrometers on both the Harlan J. Smith 2.7m telescope and the Hobby-Eberly telescope.


Statistics for USQ ePrint 25375
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version made accessible, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 26 Jun 2014 05:19
Last Modified: 17 Aug 2017 05:19
Uncontrolled Keywords: astrobiology; planetary systems; planets and satellites; dynamical evolution and stability; HD 79498; HD 155358; HD 197037; HD 220773; radial velocities
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020109 Space and Solar Physics
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020101 Astrobiology
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1088/0004-637X/749/1/39
URI: http://eprints.usq.edu.au/id/eprint/25375

Actions (login required)

View Item Archive Repository Staff Only