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Maximum Angular Separation Epochs for Exoplanet Imaging Observations

Kane, Stephen R. and Meshkat, Tiffany and Turnbull, Margaret C. (2018) Maximum Angular Separation Epochs for Exoplanet Imaging Observations. Astronomical Journal, 156 (6). Art. No. 267. ISSN 1538-3881. https://resolver.caltech.edu/CaltechAUTHORS:20181115-095346090

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Abstract

Direct imaging of exoplanets presents both significant challenges and significant gains. The advantages primarily lie in receiving emitted and, with future instruments, reflected photons at phase angles not accessible by other techniques, enabling the potential for atmospheric studies and the detection of rotation and surface features. The challenges are numerous and include coronagraph development and achieving the necessary contrast ratio. Here, we address the specific challenge of determining epochs of maximum angular separation for the star and planet. We compute orbital ephemerides for known transiting and radial velocity planets, taking Keplerian orbital elements into account. We provide analytical expressions for angular star–planet separation as a function of the true anomaly, including the locations of minimum and maximum. These expressions are used to calculate uncertainties for maximum angular separation as a function of time for the known exoplanets, and we provide strategies for improving ephemerides with application to proposed and planned imaging missions.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-3881/aae981DOIArticle
http://iopscience.iop.org/article/10.3847/1538-3881/aae981PublisherArticle
https://arxiv.org/abs/1810.07328arXivDiscussion Paper
ORCID:
AuthorORCID
Kane, Stephen R.0000-0002-7084-0529
Meshkat, Tiffany0000-0001-6126-2467
Additional Information:© 2018 The American Astronomical Society. Received 2018 August 28; revised 2018 October 12; accepted 2018 October 16; published 2018 November 15. 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. The results reported herein benefited from collaborations and/or information exchange within NASA's Nexus for Exoplanet System Science (NExSS) research coordination network sponsored by NASA's Science Mission Directorate. This work was funded by the WFIRST CGI Science Investigation Team contract #NNG16P27C (PI: Margaret Turnbull).
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASANNG16P27C
Subject Keywords:planetary systems – techniques: radial velocities – techniques: high angular resolution
Issue or Number:6
Record Number:CaltechAUTHORS:20181115-095346090
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20181115-095346090
Official Citation:Stephen R. Kane et al 2018 AJ 156 267
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90911
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 Nov 2018 19:29
Last Modified:03 Oct 2019 20:29

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