GPI Spectra of HR 8799 c, d, and e from 1.5 To 2.4 μm with KLIP Forward Modeling

Authors

• Alexandra Z. Greenbaum, University of Michigan, Ann Arbor
• Laurent Pueyo, Space Telescope Science Institute
• Jean Baptiste Ruffio, Kavli Institute for Particle Astrophysics and Cosmology
• Jason J. Wang, University of California, Berkeley
• Robert J.De Rosa, University of California, Berkeley
• Jonathan Aguilar, Johns Hopkins University
• Julien Rameau, Institut de Recherche sur les Exoplanètes
• Travis Barman, The University of Arizona
• Christian Marois, National Research Council Canada
• Mark S. Marley, NASA Ames Research Center
• Quinn Konopacky, Center for Astrophysics & Space Sciences
• Abhijith Rajan, School of Earth and Space Exploration
• Bruce Macintosh, Kavli Institute for Particle Astrophysics and Cosmology
• Megan Ansdell, University of California, Berkeley
• Pauline Arriaga, University of California, Los Angeles
• Vanessa P. Bailey, Jet Propulsion Laboratory
• Joanna Bulger, National Institutes of Natural Sciences - National Astronomical Observatory of Japan
• Adam S. Burrows, Princeton University
• Jeffrey Chilcote, Kavli Institute for Particle Astrophysics and Cosmology
• Tara Cotten, University of Georgia
• Rene Doyon, Institut de Recherche sur les Exoplanètes
• Gaspard Duchêne, University of California, Berkeley
• Michael P. Fitzgerald, University of California, Los Angeles
• Katherine B. Follette, Amherst College
• Benjamin Gerard, National Research Council Canada
• Stephen J. Goodsell, Gemini Observatory
• James R. Graham, University of California, Berkeley
• Pascale Hibon, Gemini ObservatorySouthern Operations Center
• Li Wei Hung, University of California, Los Angeles
• Patrick Ingraham, Large Synoptic Survey Telescope
• Paul Kalas, University of California, Berkeley
• James E. Larkin, University of California, Los Angeles
• Kimberly Ward-Duong, Amherst CollegeFollow
• et al, Various Institutions

Document Type

Article

Publication Date

6-1-2018

Publication Title

Astronomical Journal

Abstract

We explore KLIP forward modeling spectral extraction on Gemini Planet Imager coronagraphic data of HR 8799, using PyKLIP, and show algorithm stability with varying KLIP parameters. We report new and re-reduced spectrophotometry of HR 8799 c, d, and e in the H and K bands. We discuss a strategy for choosing optimal KLIP PSF subtraction parameters by injecting simulated sources and recovering them over a range of parameters. The K1/K2 spectra for HR 8799 c and d are similar to previously published results from the same data set. We also present a K-band spectrum of HR 8799 e for the first time and show that our H-band spectra agree well with previously published spectra from the VLT/SPHERE instrument. We show that HR 8799 c and d show significant differences in their H and K spectra, but do not find any conclusive differences between d and e, nor between c and e, likely due to large error bars in the recovered spectrum of e. Compared to M-, L-, and T-type field brown dwarfs, all three planets are most consistent with mid- and late-L spectral types. All objects are consistent with low gravity, but a lack of standard spectra for low gravity limit the ability to fit the best spectral type. We discuss how dedicated modeling efforts can better fit HR 8799 planets' near-IR flux, as well as how differences between the properties of these planets can be further explored.

Keywords

planets and satellites: gaseous planets, stars: individual (HR 8799)

Volume

155

Issue

6

DOI

https://doi.org/10.3847/1538-3881/aabcb8

ISSN

00046256

Rights

© 2018. The American Astronomical Society.

Version

Version of Record

Recommended Citation

Greenbaum, Alexandra Z.; Pueyo, Laurent; Ruffio, Jean Baptiste; Wang, Jason J.; Rosa, Robert J.De; Aguilar, Jonathan; Rameau, Julien; Barman, Travis; Marois, Christian; Marley, Mark S.; Konopacky, Quinn; Rajan, Abhijith; Macintosh, Bruce; Ansdell, Megan; Arriaga, Pauline; Bailey, Vanessa P.; Bulger, Joanna; Burrows, Adam S.; Chilcote, Jeffrey; Cotten, Tara; Doyon, Rene; Duchêne, Gaspard; Fitzgerald, Michael P.; Follette, Katherine B.; Gerard, Benjamin; Goodsell, Stephen J.; Graham, James R.; Hibon, Pascale; Hung, Li Wei; Ingraham, Patrick; Kalas, Paul; Larkin, James E.; Ward-Duong, Kimberly; and al, et, "GPI Spectra of HR 8799 c, d, and e from 1.5 To 2.4 μm with KLIP Forward Modeling" (2018). Astronomy: Faculty Publications, Smith College, Northampton, MA.
https://scholarworks.smith.edu/ast_facpubs/123