The HD 217107 planetary system: Twenty years of radial velocity measurements

Giovinazzi, Mark R. and Blake, Cullen H. and Eastman, Jason D. and Wright, Jason and McCrady, Nate and Wittenmyer, Rob and Johnson, John A. and Plavchan, Peter and Sliski, David H. and Wilson, Maurice L. and Johnson, Samson A. and Horner, Jonathan and Kane, Stephen R. and Houghton, Audrey and Garcia-Mejia, Juliana and Glaser, Joseph P. (2020) The HD 217107 planetary system: Twenty years of radial velocity measurements. Astronomische Nachrichten, 341 (9). pp. 870-878. ISSN 0004-6337


Abstract

The hot Jupiter HD 217107 b was one of the first exoplanets detected using the radial velocity (RV) method, originally reported in the literature in 1999. Today, precise RV measurements of this system span more than 20 years, and there is clear evidence of a longer-period companion, HD 217107 c. Interestingly, both the short-period planet (P<SUB>b</SUB> ∼ 7.13 d) and long-period planet (P<SUB>c</SUB> ∼ 5059 d) have significantly eccentric orbits (e<SUB>b</SUB> ∼ 0.13 and e<SUB>c</SUB> ∼ 0.40). We present 42 additional RV measurements of this system obtained with the MINERVA telescope array and carry out a joint analysis with previously published RV measurements from four different facilities. We confirm and refine the previously reported orbit of the long-period companion. HD 217107 b is one of a relatively small number of hot Jupiters with an eccentric orbit, opening up the possibility of detecting the precession of the planetary orbit due to general relativistic effects and perturbations from other planets in the system. In this case, the argument of periastron, ω, is predicted to change at the level of ∼0.8<SUP>∘</SUP> century<SUP>-1</SUP>. Despite the long time baseline of our observations and the high quality of the RV measurements, we are only able to constrain the precession to be ω̇&lt;65.9∘ century<SUP>-1</SUP>. We discuss the limitations of detecting the subtle effects of precession in exoplanet orbits using RV data.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 27 Jan 2021 06:03
Last Modified: 29 Jan 2021 04:48
Uncontrolled Keywords: planetary systems; planets and satellites: HD 217107; Astrophysics -; Earth and Planetary Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1002/asna.202013830
URI: http://eprints.usq.edu.au/id/eprint/40612

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