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Orbital Refinement and Stellar Properties for the HD 9446, HD 43691, and HD 179079 Planetary Systems

Hill, Michelle L. and Močnik, Teo and Kane, Stephen R. and Henry, Gregory W. and Pepper, Joshua and Hinkel, Natalie R. and Dalba, Paul A. and Fulton, Benjamin J. and Stassun, Keivan G. and Rosenthal, Lee J. and Howard, Andrew W. and Howell, Steve B. and Everett, Mark E. and Boyajian, Tabetha S. and Fischer, Debra A. and Rodriguez, Joseph E. and Beatty, Thomas G. and James, David J. (2020) Orbital Refinement and Stellar Properties for the HD 9446, HD 43691, and HD 179079 Planetary Systems. Astronomical Journal, 159 (5). Art. No. 197. ISSN 1538-3881. doi:10.3847/1538-3881/ab7d33.

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The Transit Ephemeris Refinement and Monitoring Survey is a project that aims to detect transits of intermediate-long period planets by refining orbital parameters of the known radial velocity planets using additional data from ground-based telescopes, calculating a revised transit ephemeris for the planet, then monitoring the planet host star during the predicted transit window. Here we present the results from three systems that had high probabilities of transiting planets: HD 9446 b and c, HD 43691 b, and HD 179079 b. We provide new radial velocity (RV) measurements that are then used to improve the orbital solution for the known planets. We search the RV data for indications of additional planets in orbit and find that HD 9446 shows a strong linear trend of 4.8σ. Using the newly refined planet orbital solutions, which include a new best-fit solution for the orbital period of HD 9446 c, and an improved transit ephemerides, we found no evidence of transiting planets in the photometry for each system. Transits of HD 9446 b can be ruled out completely and transits HD 9446 c and HD 43691 b can be ruled out for impact parameters up to b = 0.5778 and b = 0.898, respectively, due to gaps in the photometry. A transit of HD 179079 b cannot be ruled out, however, due to the relatively small size of this planet compared to the large star and thus low signal to noise. We determine properties of the three host stars through spectroscopic analysis and find through photometric analysis that HD 9446 exhibits periodic variability.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Hill, Michelle L.0000-0002-0139-4756
Močnik, Teo0000-0003-4603-556X
Kane, Stephen R.0000-0002-7084-0529
Henry, Gregory W.0000-0003-4155-8513
Pepper, Joshua0000-0002-3827-8417
Hinkel, Natalie R.0000-0003-0595-5132
Dalba, Paul A.0000-0002-4297-5506
Fulton, Benjamin J.0000-0003-3504-5316
Stassun, Keivan G.0000-0002-3481-9052
Rosenthal, Lee J.0000-0001-8391-5182
Howard, Andrew W.0000-0001-8638-0320
Howell, Steve B.0000-0002-2532-2853
Everett, Mark E.0000-0002-0885-7215
Boyajian, Tabetha S.0000-0001-9879-9313
Fischer, Debra A.0000-0003-2221-0861
Rodriguez, Joseph E.0000-0001-8812-0565
Beatty, Thomas G.0000-0002-9539-4203
James, David J.0000-0001-5160-4486
Additional Information:© 2020. The American Astronomical Society. Received 2019 May 28; revised 2020 March 4; accepted 2020 March 4; published 2020 April 9. Thanks to the anonymous referee, whose comments greatly improved the quality of the paper. G.W.H. acknowledges long-term support from NASA, NSF, Tennessee State University, and the State of Tennessee through its Centers of Excellence program. The research shown here acknowledges use of the Hypatia Catalog Database, an online compilation of stellar abundance data as described in Hinkel et al. (2014), which was supported by NASA's Nexus for Exoplanet System Science (NExSS) research coordination network and the Vanderbilt Initiative in Data-Intensive Astrophysics (VIDA). This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. This research has made use of NASA's Astrophysics Data System. This research has made use of the VizieR catalog access tool, CDS, Strasbourg, France (doi:10.26093/cds/vizier). The original description of the VizieR service was published in A&AS 143, 23.
Group:Astronomy Department
Funding AgencyGrant Number
NSF Astronomy and Astrophysics FellowshipUNSPECIFIED
Tennessee State UniversityUNSPECIFIED
Tennessee Centers of Excellence ProgramUNSPECIFIED
Subject Keywords:Radial velocity ; Transit photometry ; Photometry ; Stellar photometry ; Ephemerides ; Exoplanets ; Exoplanet dynamics ; Spectral energy distribution ; Proper motions
Issue or Number:5
Classification Code:Unified Astronomy Thesaurus concepts: Radial velocity (1332); Transit photometry (1709); Photometry (1234); Stellar photometry (1620); Ephemerides (464); Exoplanets (498); Exoplanet dynamics (490); Spectral energy distribution (2129); Proper motions (1295
Record Number:CaltechAUTHORS:20200409-115738361
Persistent URL:
Official Citation:Michelle L. Hill et al 2020 AJ 159 197
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102444
Deposited By: George Porter
Deposited On:10 Apr 2020 14:06
Last Modified:16 Nov 2021 18:12

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