TY - JOUR
T1 - Radial velocity measurements of HR 8799 B and C with medium resolution spectroscopy
AU - Ruffio, Jean Baptiste
AU - Macintosh, Bruce
AU - Konopacky, Quinn M.
AU - Barman, Travis
AU - de Rosa, Robert J.
AU - Wang, Jason J.
AU - Wilcomb, Kielan K.
AU - Czekala, Ian
AU - Marois, Christian
N1 - Funding Information:
generous financial support of the W. M. Keck Foundation. We also wish to recognize the very important cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. Facility: Keck I (OSIRIS).
Funding Information:
We would like to thank Tuan Do and Adam Mantz for their help with OSIRIS data calibration, and statistics related issues respectively. The research was supported by grants from NSF, including AST-1411868 (J.-B.R., B.M.), 1614492, and 1614492 (T.S.B.). Support was provided by grants from the National Aeronautics and Space Administration (NASA) NNX15AD95G (J.-B.R., R.J.D.R.). This work benefited from NASAâs Nexus for Exoplanet System Science (NExSS) research coordination network sponsored by NASAâs Science Mission Directorate. Q.M.K., T.S.B., and K.K.W. were supported by NASA under grant no. NNX17AB63G issued through the Astrophysics Division of the Science Mission Directorate. Any opinions, findings, and conclusions or recommendations expressed in this work are those of the author(s) and do not necessarily reflect the views of the National Aeronautics and Space Administration. This work made use of the sky-background models made available by the Gemini observatory.12 The W. M. Keck Observatory is operated as a scientific partnership among the California Institute of Technology, the University of California, and NASA. The Keck Observatory was made possible by the
Publisher Copyright:
© 2019. The American Astronomical Society. All rights reserved.
PY - 2019/11
Y1 - 2019/11
N2 - High-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 −9.2 ± 0.5 km s−1 and −11.6 ± 0.5 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 W = 89° +27/-17 and i = 20.8° +4.5/-3.7 .
AB - High-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 −9.2 ± 0.5 km s−1 and −11.6 ± 0.5 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 W = 89° +27/-17 and i = 20.8° +4.5/-3.7 .
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U2 - 10.3847/1538-3881/ab4594
DO - 10.3847/1538-3881/ab4594
M3 - Article
AN - SCOPUS:85085764963
SN - 0004-637X
VL - 158
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 5
M1 - ab4594
ER -