SCExAO/CHARIS Near-infrared Direct Imaging, Spectroscopy, and Forward-Modeling of κ And b: A Likely Young, Low-gravity Superjovian Companion

Thayne Currie, Timothy D. Brandt, Taichi Uyama, Eric L. Nielsen, Sarah Blunt, Olivier Guyon, Motohide Tamura, Christian Marois, Kyle Mede, Masayuki Kuzuhara, Tyler D. Groff, Nemanja Jovanovic, N. Jeremy Kasdin, Julien Lozi, Klaus Hodapp, Jeffrey Chilcote, Joseph Carson, Frantz Martinache, Sean Goebel, Carol GradyMichael McElwain, Eiji Akiyama, Ruben Asensio-Torres, Masa Hayashi, Markus Janson, Gillian R. Knapp, Jungmi Kwon, Jun Nishikawa, Daehyeon Oh, Joshua Schlieder, Eugene Serabyn, Michael Sitko, Nour Skaf

Research output: Contribution to journalArticle

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Abstract

We present SCExAO/CHARIS high-contrast imaging/JHK integral field spectroscopy of κ And b, a directly imaged low-mass companion orbiting a nearby B9V star. We detect κ And b at a high signal-to-noise ratio and extract high-precision spectrophotometry using a new forward-modeling algorithm for (A-)LOCI complementary to KLIP-FM developed by Pueyo et al. κ And b's spectrum best resembles that of a low-gravity L0-L1 dwarf (L0-L1γ). Its spectrum and luminosity are very well matched by 2MASS J0141-4633 and several other 12.5-15 M J free-floating members of the 40 Myr old Tuc-Hor Association, consistent with a system age derived from recent interferometric results for the primary, a companion mass at/near the deuterium-burning limit (13 - + 2 12 M J ), and a companion-to-primary mass ratio characteristic of other directly imaged planets (q ∼ 0.005 - + 0.001 0.005 ). We did not unambiguously identify additional, more closely orbiting companions brighter and more massive than κ And b down to ρ ∼ 0 3 (15 au). SCExAO/CHARIS and complementary Keck/NIRC2 astrometric points reveal clockwise orbital motion. Modeling points toward a likely eccentric orbit: a subset of acceptable orbits include those that are aligned with the star's rotation axis. However, κ And b's semimajor axis is plausibly larger than 55 au and in a region where disk instability could form massive companions. Deeper high-contrast imaging of κ And and low-resolution spectroscopy from extreme adaptive optics systems such as SCExAO/CHARIS and higher-resolution spectroscopy from Keck/OSIRIS or, later, IRIS on the Thirty Meter Telescope could help to clarify κ And b's chemistry and whether its spectrum provides an insight into its formation environment.

Original languageEnglish (US)
Article number291
JournalAstronomical Journal
Volume156
Issue number6
DOIs
StatePublished - Dec 1 2018

Fingerprint

forward modeling
microgravity
near infrared
spectroscopy
gravity
OSIRIS
orbits
stars
eccentric orbits
deuterium
spectrophotometry
adaptive optics
mass ratios
frequency modulation
signal-to-noise ratio
floating
set theory
planets
signal to noise ratios
planet

Keywords

  • Planetary systems
  • Stars: early-type
  • Stars: individual: (HD 222439)
  • Techniques: high angular resolution

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

SCExAO/CHARIS Near-infrared Direct Imaging, Spectroscopy, and Forward-Modeling of κ And b : A Likely Young, Low-gravity Superjovian Companion. / Currie, Thayne; Brandt, Timothy D.; Uyama, Taichi; Nielsen, Eric L.; Blunt, Sarah; Guyon, Olivier; Tamura, Motohide; Marois, Christian; Mede, Kyle; Kuzuhara, Masayuki; Groff, Tyler D.; Jovanovic, Nemanja; Jeremy Kasdin, N.; Lozi, Julien; Hodapp, Klaus; Chilcote, Jeffrey; Carson, Joseph; Martinache, Frantz; Goebel, Sean; Grady, Carol; McElwain, Michael; Akiyama, Eiji; Asensio-Torres, Ruben; Hayashi, Masa; Janson, Markus; Knapp, Gillian R.; Kwon, Jungmi; Nishikawa, Jun; Oh, Daehyeon; Schlieder, Joshua; Serabyn, Eugene; Sitko, Michael; Skaf, Nour.

In: Astronomical Journal, Vol. 156, No. 6, 291, 01.12.2018.

Research output: Contribution to journalArticle

Currie, T, Brandt, TD, Uyama, T, Nielsen, EL, Blunt, S, Guyon, O, Tamura, M, Marois, C, Mede, K, Kuzuhara, M, Groff, TD, Jovanovic, N, Jeremy Kasdin, N, Lozi, J, Hodapp, K, Chilcote, J, Carson, J, Martinache, F, Goebel, S, Grady, C, McElwain, M, Akiyama, E, Asensio-Torres, R, Hayashi, M, Janson, M, Knapp, GR, Kwon, J, Nishikawa, J, Oh, D, Schlieder, J, Serabyn, E, Sitko, M & Skaf, N 2018, 'SCExAO/CHARIS Near-infrared Direct Imaging, Spectroscopy, and Forward-Modeling of κ And b: A Likely Young, Low-gravity Superjovian Companion', Astronomical Journal, vol. 156, no. 6, 291. https://doi.org/10.3847/1538-3881/aae9ea
Currie, Thayne ; Brandt, Timothy D. ; Uyama, Taichi ; Nielsen, Eric L. ; Blunt, Sarah ; Guyon, Olivier ; Tamura, Motohide ; Marois, Christian ; Mede, Kyle ; Kuzuhara, Masayuki ; Groff, Tyler D. ; Jovanovic, Nemanja ; Jeremy Kasdin, N. ; Lozi, Julien ; Hodapp, Klaus ; Chilcote, Jeffrey ; Carson, Joseph ; Martinache, Frantz ; Goebel, Sean ; Grady, Carol ; McElwain, Michael ; Akiyama, Eiji ; Asensio-Torres, Ruben ; Hayashi, Masa ; Janson, Markus ; Knapp, Gillian R. ; Kwon, Jungmi ; Nishikawa, Jun ; Oh, Daehyeon ; Schlieder, Joshua ; Serabyn, Eugene ; Sitko, Michael ; Skaf, Nour. / SCExAO/CHARIS Near-infrared Direct Imaging, Spectroscopy, and Forward-Modeling of κ And b : A Likely Young, Low-gravity Superjovian Companion. In: Astronomical Journal. 2018 ; Vol. 156, No. 6.
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abstract = "We present SCExAO/CHARIS high-contrast imaging/JHK integral field spectroscopy of κ And b, a directly imaged low-mass companion orbiting a nearby B9V star. We detect κ And b at a high signal-to-noise ratio and extract high-precision spectrophotometry using a new forward-modeling algorithm for (A-)LOCI complementary to KLIP-FM developed by Pueyo et al. κ And b's spectrum best resembles that of a low-gravity L0-L1 dwarf (L0-L1γ). Its spectrum and luminosity are very well matched by 2MASS J0141-4633 and several other 12.5-15 M J free-floating members of the 40 Myr old Tuc-Hor Association, consistent with a system age derived from recent interferometric results for the primary, a companion mass at/near the deuterium-burning limit (13 - + 2 12 M J ), and a companion-to-primary mass ratio characteristic of other directly imaged planets (q ∼ 0.005 - + 0.001 0.005 ). We did not unambiguously identify additional, more closely orbiting companions brighter and more massive than κ And b down to ρ ∼ 0 3 (15 au). SCExAO/CHARIS and complementary Keck/NIRC2 astrometric points reveal clockwise orbital motion. Modeling points toward a likely eccentric orbit: a subset of acceptable orbits include those that are aligned with the star's rotation axis. However, κ And b's semimajor axis is plausibly larger than 55 au and in a region where disk instability could form massive companions. Deeper high-contrast imaging of κ And and low-resolution spectroscopy from extreme adaptive optics systems such as SCExAO/CHARIS and higher-resolution spectroscopy from Keck/OSIRIS or, later, IRIS on the Thirty Meter Telescope could help to clarify κ And b's chemistry and whether its spectrum provides an insight into its formation environment.",
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T1 - SCExAO/CHARIS Near-infrared Direct Imaging, Spectroscopy, and Forward-Modeling of κ And b

T2 - A Likely Young, Low-gravity Superjovian Companion

AU - Currie, Thayne

AU - Brandt, Timothy D.

AU - Uyama, Taichi

AU - Nielsen, Eric L.

AU - Blunt, Sarah

AU - Guyon, Olivier

AU - Tamura, Motohide

AU - Marois, Christian

AU - Mede, Kyle

AU - Kuzuhara, Masayuki

AU - Groff, Tyler D.

AU - Jovanovic, Nemanja

AU - Jeremy Kasdin, N.

AU - Lozi, Julien

AU - Hodapp, Klaus

AU - Chilcote, Jeffrey

AU - Carson, Joseph

AU - Martinache, Frantz

AU - Goebel, Sean

AU - Grady, Carol

AU - McElwain, Michael

AU - Akiyama, Eiji

AU - Asensio-Torres, Ruben

AU - Hayashi, Masa

AU - Janson, Markus

AU - Knapp, Gillian R.

AU - Kwon, Jungmi

AU - Nishikawa, Jun

AU - Oh, Daehyeon

AU - Schlieder, Joshua

AU - Serabyn, Eugene

AU - Sitko, Michael

AU - Skaf, Nour

PY - 2018/12/1

Y1 - 2018/12/1

N2 - We present SCExAO/CHARIS high-contrast imaging/JHK integral field spectroscopy of κ And b, a directly imaged low-mass companion orbiting a nearby B9V star. We detect κ And b at a high signal-to-noise ratio and extract high-precision spectrophotometry using a new forward-modeling algorithm for (A-)LOCI complementary to KLIP-FM developed by Pueyo et al. κ And b's spectrum best resembles that of a low-gravity L0-L1 dwarf (L0-L1γ). Its spectrum and luminosity are very well matched by 2MASS J0141-4633 and several other 12.5-15 M J free-floating members of the 40 Myr old Tuc-Hor Association, consistent with a system age derived from recent interferometric results for the primary, a companion mass at/near the deuterium-burning limit (13 - + 2 12 M J ), and a companion-to-primary mass ratio characteristic of other directly imaged planets (q ∼ 0.005 - + 0.001 0.005 ). We did not unambiguously identify additional, more closely orbiting companions brighter and more massive than κ And b down to ρ ∼ 0 3 (15 au). SCExAO/CHARIS and complementary Keck/NIRC2 astrometric points reveal clockwise orbital motion. Modeling points toward a likely eccentric orbit: a subset of acceptable orbits include those that are aligned with the star's rotation axis. However, κ And b's semimajor axis is plausibly larger than 55 au and in a region where disk instability could form massive companions. Deeper high-contrast imaging of κ And and low-resolution spectroscopy from extreme adaptive optics systems such as SCExAO/CHARIS and higher-resolution spectroscopy from Keck/OSIRIS or, later, IRIS on the Thirty Meter Telescope could help to clarify κ And b's chemistry and whether its spectrum provides an insight into its formation environment.

AB - We present SCExAO/CHARIS high-contrast imaging/JHK integral field spectroscopy of κ And b, a directly imaged low-mass companion orbiting a nearby B9V star. We detect κ And b at a high signal-to-noise ratio and extract high-precision spectrophotometry using a new forward-modeling algorithm for (A-)LOCI complementary to KLIP-FM developed by Pueyo et al. κ And b's spectrum best resembles that of a low-gravity L0-L1 dwarf (L0-L1γ). Its spectrum and luminosity are very well matched by 2MASS J0141-4633 and several other 12.5-15 M J free-floating members of the 40 Myr old Tuc-Hor Association, consistent with a system age derived from recent interferometric results for the primary, a companion mass at/near the deuterium-burning limit (13 - + 2 12 M J ), and a companion-to-primary mass ratio characteristic of other directly imaged planets (q ∼ 0.005 - + 0.001 0.005 ). We did not unambiguously identify additional, more closely orbiting companions brighter and more massive than κ And b down to ρ ∼ 0 3 (15 au). SCExAO/CHARIS and complementary Keck/NIRC2 astrometric points reveal clockwise orbital motion. Modeling points toward a likely eccentric orbit: a subset of acceptable orbits include those that are aligned with the star's rotation axis. However, κ And b's semimajor axis is plausibly larger than 55 au and in a region where disk instability could form massive companions. Deeper high-contrast imaging of κ And and low-resolution spectroscopy from extreme adaptive optics systems such as SCExAO/CHARIS and higher-resolution spectroscopy from Keck/OSIRIS or, later, IRIS on the Thirty Meter Telescope could help to clarify κ And b's chemistry and whether its spectrum provides an insight into its formation environment.

KW - Planetary systems

KW - Stars: early-type

KW - Stars: individual: (HD 222439)

KW - Techniques: high angular resolution

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