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

Alexandra Z. Greenbaum, Laurent Pueyo, Jean Baptiste Ruffio, Jason J. Wang, Robert J.De Rosa, Jonathan Aguilar, Julien Rameau, Travis Barman, Christian Marois, Mark S. Marley, Quinn Konopacky, Abhijith Rajan, Bruce Macintosh, Megan Ansdell, Pauline Arriaga, Vanessa P. Bailey, Joanna Bulger, Adam S. Burrows, Jeffrey Chilcote, Tara Cotten & 34 others Rene Doyon, Gaspard Duchêne, Michael P. Fitzgerald, Katherine B. Follette, Benjamin Gerard, Stephen J. Goodsell, James R. Graham, Pascale Hibon, Li Wei Hung, Patrick Ingraham, Paul Kalas, James E. Larkin, Jérôme Maire, Franck Marchis, Stanimir Metchev, Maxwell A. Millar-Blanchaer, Eric L. Nielsen, Andrew Norton, Rebecca Oppenheimer, David Palmer, Jennifer Patience, Marshall D. Perrin, Lisa Poyneer, Fredrik T. Rantakyrö, Dmitry Savransky, Adam C. Schneider, Anand Sivaramakrishnan, Inseok Song, Rémi Soummer, Sandrine Thomas, J. Kent Wallace, Kimberly Ward-Duong, Sloane Wiktorowicz, Schuyler Wolff

Research output: Contribution to journalArticle

5 Citations (Scopus)

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.

Original languageEnglish (US)
Article number226
JournalAstronomical Journal
Volume155
Issue number6
DOIs
StatePublished - Jun 1 2018

Fingerprint

forward modeling
planets
planet
extremely high frequencies
microgravity
gravity
spectrophotometry
subtraction
modeling
parameter

Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Greenbaum, A. Z., Pueyo, L., Ruffio, J. B., Wang, J. J., Rosa, R. J. D., Aguilar, J., ... Wolff, S. (2018). GPI Spectra of HR 8799 c, d, and e from 1.5 to 2.4 μm with KLIP Forward Modeling. Astronomical Journal, 155(6), [226]. https://doi.org/10.3847/1538-3881/aabcb8

GPI Spectra of HR 8799 c, d, and e from 1.5 to 2.4 μm with KLIP Forward Modeling. / 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.; Maire, Jérôme; Marchis, Franck; Metchev, Stanimir; Millar-Blanchaer, Maxwell A.; Nielsen, Eric L.; Norton, Andrew; Oppenheimer, Rebecca; Palmer, David; Patience, Jennifer; Perrin, Marshall D.; Poyneer, Lisa; Rantakyrö, Fredrik T.; Savransky, Dmitry; Schneider, Adam C.; Sivaramakrishnan, Anand; Song, Inseok; Soummer, Rémi; Thomas, Sandrine; Wallace, J. Kent; Ward-Duong, Kimberly; Wiktorowicz, Sloane; Wolff, Schuyler.

In: Astronomical Journal, Vol. 155, No. 6, 226, 01.06.2018.

Research output: Contribution to journalArticle

Greenbaum, AZ, Pueyo, L, Ruffio, JB, Wang, JJ, Rosa, RJD, Aguilar, J, Rameau, J, Barman, T, Marois, C, Marley, MS, Konopacky, Q, Rajan, A, Macintosh, B, Ansdell, M, Arriaga, P, Bailey, VP, Bulger, J, Burrows, AS, Chilcote, J, Cotten, T, Doyon, R, Duchêne, G, Fitzgerald, MP, Follette, KB, Gerard, B, Goodsell, SJ, Graham, JR, Hibon, P, Hung, LW, Ingraham, P, Kalas, P, Larkin, JE, Maire, J, Marchis, F, Metchev, S, Millar-Blanchaer, MA, Nielsen, EL, Norton, A, Oppenheimer, R, Palmer, D, Patience, J, Perrin, MD, Poyneer, L, Rantakyrö, FT, Savransky, D, Schneider, AC, Sivaramakrishnan, A, Song, I, Soummer, R, Thomas, S, Wallace, JK, Ward-Duong, K, Wiktorowicz, S & Wolff, S 2018, 'GPI Spectra of HR 8799 c, d, and e from 1.5 to 2.4 μm with KLIP Forward Modeling', Astronomical Journal, vol. 155, no. 6, 226. https://doi.org/10.3847/1538-3881/aabcb8
Greenbaum AZ, Pueyo L, Ruffio JB, Wang JJ, Rosa RJD, Aguilar J et al. GPI Spectra of HR 8799 c, d, and e from 1.5 to 2.4 μm with KLIP Forward Modeling. Astronomical Journal. 2018 Jun 1;155(6). 226. https://doi.org/10.3847/1538-3881/aabcb8
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. ; Maire, Jérôme ; Marchis, Franck ; Metchev, Stanimir ; Millar-Blanchaer, Maxwell A. ; Nielsen, Eric L. ; Norton, Andrew ; Oppenheimer, Rebecca ; Palmer, David ; Patience, Jennifer ; Perrin, Marshall D. ; Poyneer, Lisa ; Rantakyrö, Fredrik T. ; Savransky, Dmitry ; Schneider, Adam C. ; Sivaramakrishnan, Anand ; Song, Inseok ; Soummer, Rémi ; Thomas, Sandrine ; Wallace, J. Kent ; Ward-Duong, Kimberly ; Wiktorowicz, Sloane ; Wolff, Schuyler. / GPI Spectra of HR 8799 c, d, and e from 1.5 to 2.4 μm with KLIP Forward Modeling. In: Astronomical Journal. 2018 ; Vol. 155, No. 6.
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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.",
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AU - Pueyo, Laurent

AU - Ruffio, Jean Baptiste

AU - Wang, Jason J.

AU - Rosa, Robert J.De

AU - Aguilar, Jonathan

AU - Rameau, Julien

AU - Barman, Travis

AU - Marois, Christian

AU - Marley, Mark S.

AU - Konopacky, Quinn

AU - Rajan, Abhijith

AU - Macintosh, Bruce

AU - Ansdell, Megan

AU - Arriaga, Pauline

AU - Bailey, Vanessa P.

AU - Bulger, Joanna

AU - Burrows, Adam S.

AU - Chilcote, Jeffrey

AU - Cotten, Tara

AU - Doyon, Rene

AU - Duchêne, Gaspard

AU - Fitzgerald, Michael P.

AU - Follette, Katherine B.

AU - Gerard, Benjamin

AU - Goodsell, Stephen J.

AU - Graham, James R.

AU - Hibon, Pascale

AU - Hung, Li Wei

AU - Ingraham, Patrick

AU - Kalas, Paul

AU - Larkin, James E.

AU - Maire, Jérôme

AU - Marchis, Franck

AU - Metchev, Stanimir

AU - Millar-Blanchaer, Maxwell A.

AU - Nielsen, Eric L.

AU - Norton, Andrew

AU - Oppenheimer, Rebecca

AU - Palmer, David

AU - Patience, Jennifer

AU - Perrin, Marshall D.

AU - Poyneer, Lisa

AU - Rantakyrö, Fredrik T.

AU - Savransky, Dmitry

AU - Schneider, Adam C.

AU - Sivaramakrishnan, Anand

AU - Song, Inseok

AU - Soummer, Rémi

AU - Thomas, Sandrine

AU - Wallace, J. Kent

AU - Ward-Duong, Kimberly

AU - Wiktorowicz, Sloane

AU - Wolff, Schuyler

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KW - stars: individual (HR 8799)

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