Radial Velocity Measurements of HR 8799 b and c with Medium Resolution Spectroscopy
Konopacky, Quinn M.
De Rosa, Robert J.
Wang, Jason J.
Wilcomb, Kielan K.
AffiliationUniv Arizona, Lunar & Planetary Lab
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationJean-Baptiste Ruffio et al 2019 AJ 158 200
RightsCopyright © 2019. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractHigh-contrast medium resolution spectroscopy has been used to detect molecules such as water and carbon monoxide in the atmospheres of gas giant exoplanets. In this work, we show how it can be used to derive radial velocity (RV) measurements of directly imaged exoplanets. Improving upon the traditional cross-correlation technique, we develop a new likelihood based on joint forward modeling of the planetary signal and the starlight background (i.e., speckles). After marginalizing over the starlight model, we infer the barycentric RV of HR 8799 b and c in 2010 yielding ?9.20.5 km s(?1) and ?11.60.5 km s(?1), respectively. These RV measurements help to constrain the 3D orientation of the orbit of the planet by resolving the degeneracy in the longitude of an ascending node. Assuming coplanar orbits for HR 8799 b and c, but not including d and e, we estimate Omega = 89 degrees(27)(-17+) and i = 20 degrees.8(-3.7)(+4.5).
VersionFinal published version
SponsorsNational Science Foundation (NSF) [AST-1411868, 1614492]; National Aeronautics & Space Administration (NASA) [NNX15AD95G]; NASAs Science Mission Directorate; National Aeronautics & Space Administration (NASA) [NNX17AB63G]; W.M. Keck Foundation