High-contrast imaging of intermediate-mass giants with long-term radial velocity trends

Tsuguru Ryu; Bun'Ei Sato; Masayuki Kuzuhara; Norio Narita; Yasuhiro H. Takahashi; Taichi Uyama; Tomoyuki Kudo; Nobuhiko Kusakabe; Jun Hashimoto; Masashi Omiya; Hiroki Harakawa; Lyu Abe; Hiroyasu Ando; Wolfgang Brandner; Timothy D. Brandt; Joseph C. Carson; Thayne Currie; Sebastian Egner; Markus Feldt; Miwa Goto; Carol A. Grady; Olivier Guyon; Yutaka Hayano; Masahiko Hayashi; Saeko S. Hayashi; Krzysztof G. Hełminiak; Thomas Henning; Klaus W. Hodapp; Shigeru Ida; Miki Ishii; Yoichi Itoh; Masanori Iye; Hideyuki Izumiura; Markus Janson; Eiji Kambe; Ryo Kandori; Gillian R. Knapp; Eiichiro Kokubo; Jungmi Kwon; Taro Matsuo; Satoshi Mayama; Michael W. McElwain; Kyle Mede; Shoken Miyama; Jun Ichi Morino; Amaya Moro-Martin; Tetsuo Nishimura; Tae Soo Pyo; Eugene Serabyn; Takuya Suenaga; Hiroshi Suto; Ryuji Suzuki; Michihiro Takami; Naruhisa Takato; Yoichi Takeda; Hiroshi Terada; Christian Thalmann; Edwin L. Turner; Makoto Watanabe; John Wisniewski; Toru Yamada; Michitoshi Yoshida; Hideki Takami; Tomonori Usuda; Motohide Tamura

doi:10.3847/0004-637X/825/2/127

High-contrast imaging of intermediate-mass giants with long-term radial velocity trends

Tsuguru Ryu, Bun'Ei Sato, Masayuki Kuzuhara, Norio Narita, Yasuhiro H. Takahashi, Taichi Uyama, Tomoyuki Kudo, Nobuhiko Kusakabe, Jun Hashimoto, Masashi Omiya, Hiroki Harakawa, Lyu Abe, Hiroyasu Ando, Wolfgang Brandner, Timothy D. Brandt, Joseph C. Carson, Thayne Currie, Sebastian Egner, Markus Feldt, Miwa GotoCarol A. Grady, Olivier Guyon, Yutaka Hayano, Masahiko Hayashi, Saeko S. Hayashi, Krzysztof G. Hełminiak, Thomas Henning, Klaus W. Hodapp, Shigeru Ida, Miki Ishii, Yoichi Itoh, Masanori Iye, Hideyuki Izumiura, Markus Janson, Eiji Kambe, Ryo Kandori, Gillian R. Knapp, Eiichiro Kokubo, Jungmi Kwon, Taro Matsuo, Satoshi Mayama, Michael W. McElwain, Kyle Mede, Shoken Miyama, Jun Ichi Morino, Amaya Moro-Martin, Tetsuo Nishimura, Tae Soo Pyo, Eugene Serabyn, Takuya Suenaga, Hiroshi Suto, Ryuji Suzuki, Michihiro Takami, Naruhisa Takato, Yoichi Takeda, Hiroshi Terada, Christian Thalmann, Edwin L. Turner, Makoto Watanabe, John Wisniewski, Toru Yamada, Michitoshi Yoshida, Hideki Takami, Tomonori Usuda, Motohide Tamura

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

A radial velocity (RV) survey for intermediate-mass giants has been in operation for over a decade at Okayama Astrophysical Observatory (OAO). The OAO survey has revealed that some giants show long-term linear RV accelerations (RV trends), indicating the presence of outer companions. Direct-imaging observations can help clarify what objects generate these RV trends. We present the results of high-contrast imaging observations of six intermediate-mass giants with long-term RV trends using the Subaru Telescope and HiCIAO camera. We detected co-moving companions to γ Hya B (0.61_-0.14^+0.12M_⊙), HD 5608 B (0.10 ± 0.01M_⊙), and HD 109272 B (0.28 ± 0.06 M_⊙). For the remaining targets (ι Dra, 18 Del, and HD 14067), we exclude companions more massive than 30-60 M _Jup at projected separations of 1″-7″. We examine whether these directly imaged companions or unidentified long-period companions can account for the RV trends observed around the six giants. We find that the Kozai mechanism can explain the high eccentricity of the inner planets ι Dra b, HD 5608 b, and HD 14067 b.

Original language	English (US)
Article number	127
Journal	Astrophysical Journal
Volume	825
Issue number	2
DOIs	https://doi.org/10.3847/0004-637X/825/2/127
State	Published - Jul 10 2016
Externally published	Yes

Keywords

binaries: general
methods: observational
planetary systems
techniques: high angular resolution
techniques: radial velocities

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/0004-637X/825/2/127

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Ryu, T., Sato, BE., Kuzuhara, M., Narita, N., Takahashi, Y. H., Uyama, T., Kudo, T., Kusakabe, N., Hashimoto, J., Omiya, M., Harakawa, H., Abe, L., Ando, H., Brandner, W., Brandt, T. D., Carson, J. C., Currie, T., Egner, S., Feldt, M., ... Tamura, M. (2016). High-contrast imaging of intermediate-mass giants with long-term radial velocity trends. Astrophysical Journal, 825(2), Article 127. https://doi.org/10.3847/0004-637X/825/2/127

Ryu, T, Sato, BE, Kuzuhara, M, Narita, N, Takahashi, YH, Uyama, T, Kudo, T, Kusakabe, N, Hashimoto, J, Omiya, M, Harakawa, H, Abe, L, Ando, H, Brandner, W, Brandt, TD, Carson, JC, Currie, T, Egner, S, Feldt, M, Goto, M, Grady, CA, Guyon, O, Hayano, Y, Hayashi, M, Hayashi, SS, Hełminiak, KG, Henning, T, Hodapp, KW, Ida, S, Ishii, M, Itoh, Y, Iye, M, Izumiura, H, Janson, M, Kambe, E, Kandori, R, Knapp, GR, Kokubo, E, Kwon, J, Matsuo, T, Mayama, S, McElwain, MW, Mede, K, Miyama, S, Morino, JI, Moro-Martin, A, Nishimura, T, Pyo, TS, Serabyn, E, Suenaga, T, Suto, H, Suzuki, R, Takami, M, Takato, N, Takeda, Y, Terada, H, Thalmann, C, Turner, EL, Watanabe, M, Wisniewski, J, Yamada, T, Yoshida, M, Takami, H, Usuda, T & Tamura, M 2016, 'High-contrast imaging of intermediate-mass giants with long-term radial velocity trends', Astrophysical Journal, vol. 825, no. 2, 127. https://doi.org/10.3847/0004-637X/825/2/127

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title = "High-contrast imaging of intermediate-mass giants with long-term radial velocity trends",

abstract = "A radial velocity (RV) survey for intermediate-mass giants has been in operation for over a decade at Okayama Astrophysical Observatory (OAO). The OAO survey has revealed that some giants show long-term linear RV accelerations (RV trends), indicating the presence of outer companions. Direct-imaging observations can help clarify what objects generate these RV trends. We present the results of high-contrast imaging observations of six intermediate-mass giants with long-term RV trends using the Subaru Telescope and HiCIAO camera. We detected co-moving companions to γ Hya B (0.61-0.14+0.12M⊙), HD 5608 B (0.10 ± 0.01M⊙), and HD 109272 B (0.28 ± 0.06 M⊙). For the remaining targets (ι Dra, 18 Del, and HD 14067), we exclude companions more massive than 30-60 M Jup at projected separations of 1″-7″. We examine whether these directly imaged companions or unidentified long-period companions can account for the RV trends observed around the six giants. We find that the Kozai mechanism can explain the high eccentricity of the inner planets ι Dra b, HD 5608 b, and HD 14067 b.",

keywords = "binaries: general, methods: observational, planetary systems, techniques: high angular resolution, techniques: radial velocities",

author = "Tsuguru Ryu and Bun'Ei Sato and Masayuki Kuzuhara and Norio Narita and Takahashi, {Yasuhiro H.} and Taichi Uyama and Tomoyuki Kudo and Nobuhiko Kusakabe and Jun Hashimoto and Masashi Omiya and Hiroki Harakawa and Lyu Abe and Hiroyasu Ando and Wolfgang Brandner and Brandt, {Timothy D.} and Carson, {Joseph C.} and Thayne Currie and Sebastian Egner and Markus Feldt and Miwa Goto and Grady, {Carol A.} and Olivier Guyon and Yutaka Hayano and Masahiko Hayashi and Hayashi, {Saeko S.} and He{\l}miniak, {Krzysztof G.} and Thomas Henning and Hodapp, {Klaus W.} and Shigeru Ida and Miki Ishii and Yoichi Itoh and Masanori Iye and Hideyuki Izumiura and Markus Janson and Eiji Kambe and Ryo Kandori and Knapp, {Gillian R.} and Eiichiro Kokubo and Jungmi Kwon and Taro Matsuo and Satoshi Mayama and McElwain, {Michael W.} and Kyle Mede and Shoken Miyama and Morino, {Jun Ichi} and Amaya Moro-Martin and Tetsuo Nishimura and Pyo, {Tae Soo} and Eugene Serabyn and Takuya Suenaga and Hiroshi Suto and Ryuji Suzuki and Michihiro Takami and Naruhisa Takato and Yoichi Takeda and Hiroshi Terada and Christian Thalmann and Turner, {Edwin L.} and Makoto Watanabe and John Wisniewski and Toru Yamada and Michitoshi Yoshida and Hideki Takami and Tomonori Usuda and Motohide Tamura",

year = "2016",

month = jul,

day = "10",

doi = "10.3847/0004-637X/825/2/127",

language = "English (US)",

volume = "825",

journal = "Astrophysical Journal",

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publisher = "American Astronomical Society",

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T1 - High-contrast imaging of intermediate-mass giants with long-term radial velocity trends

AU - Ryu, Tsuguru

AU - Sato, Bun'Ei

AU - Kuzuhara, Masayuki

AU - Narita, Norio

AU - Takahashi, Yasuhiro H.

AU - Uyama, Taichi

AU - Kudo, Tomoyuki

AU - Kusakabe, Nobuhiko

AU - Hashimoto, Jun

AU - Omiya, Masashi

AU - Harakawa, Hiroki

AU - Abe, Lyu

AU - Ando, Hiroyasu

AU - Brandner, Wolfgang

AU - Brandt, Timothy D.

AU - Carson, Joseph C.

AU - Currie, Thayne

AU - Egner, Sebastian

AU - Feldt, Markus

AU - Goto, Miwa

AU - Grady, Carol A.

AU - Guyon, Olivier

AU - Hayano, Yutaka

AU - Hayashi, Masahiko

AU - Hayashi, Saeko S.

AU - Hełminiak, Krzysztof G.

AU - Henning, Thomas

AU - Hodapp, Klaus W.

AU - Ida, Shigeru

AU - Ishii, Miki

AU - Itoh, Yoichi

AU - Iye, Masanori

AU - Izumiura, Hideyuki

AU - Janson, Markus

AU - Kambe, Eiji

AU - Kandori, Ryo

AU - Knapp, Gillian R.

AU - Kokubo, Eiichiro

AU - Kwon, Jungmi

AU - Matsuo, Taro

AU - Mayama, Satoshi

AU - McElwain, Michael W.

AU - Mede, Kyle

AU - Miyama, Shoken

AU - Morino, Jun Ichi

AU - Moro-Martin, Amaya

AU - Nishimura, Tetsuo

AU - Pyo, Tae Soo

AU - Serabyn, Eugene

AU - Suenaga, Takuya

AU - Suto, Hiroshi

AU - Suzuki, Ryuji

AU - Takami, Michihiro

AU - Takato, Naruhisa

AU - Takeda, Yoichi

AU - Terada, Hiroshi

AU - Thalmann, Christian

AU - Turner, Edwin L.

AU - Watanabe, Makoto

AU - Wisniewski, John

AU - Yamada, Toru

AU - Yoshida, Michitoshi

AU - Takami, Hideki

AU - Usuda, Tomonori

AU - Tamura, Motohide

PY - 2016/7/10

Y1 - 2016/7/10

N2 - A radial velocity (RV) survey for intermediate-mass giants has been in operation for over a decade at Okayama Astrophysical Observatory (OAO). The OAO survey has revealed that some giants show long-term linear RV accelerations (RV trends), indicating the presence of outer companions. Direct-imaging observations can help clarify what objects generate these RV trends. We present the results of high-contrast imaging observations of six intermediate-mass giants with long-term RV trends using the Subaru Telescope and HiCIAO camera. We detected co-moving companions to γ Hya B (0.61-0.14+0.12M⊙), HD 5608 B (0.10 ± 0.01M⊙), and HD 109272 B (0.28 ± 0.06 M⊙). For the remaining targets (ι Dra, 18 Del, and HD 14067), we exclude companions more massive than 30-60 M Jup at projected separations of 1″-7″. We examine whether these directly imaged companions or unidentified long-period companions can account for the RV trends observed around the six giants. We find that the Kozai mechanism can explain the high eccentricity of the inner planets ι Dra b, HD 5608 b, and HD 14067 b.

AB - A radial velocity (RV) survey for intermediate-mass giants has been in operation for over a decade at Okayama Astrophysical Observatory (OAO). The OAO survey has revealed that some giants show long-term linear RV accelerations (RV trends), indicating the presence of outer companions. Direct-imaging observations can help clarify what objects generate these RV trends. We present the results of high-contrast imaging observations of six intermediate-mass giants with long-term RV trends using the Subaru Telescope and HiCIAO camera. We detected co-moving companions to γ Hya B (0.61-0.14+0.12M⊙), HD 5608 B (0.10 ± 0.01M⊙), and HD 109272 B (0.28 ± 0.06 M⊙). For the remaining targets (ι Dra, 18 Del, and HD 14067), we exclude companions more massive than 30-60 M Jup at projected separations of 1″-7″. We examine whether these directly imaged companions or unidentified long-period companions can account for the RV trends observed around the six giants. We find that the Kozai mechanism can explain the high eccentricity of the inner planets ι Dra b, HD 5608 b, and HD 14067 b.

KW - binaries: general

KW - methods: observational

KW - planetary systems

KW - techniques: high angular resolution

KW - techniques: radial velocities

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U2 - 10.3847/0004-637X/825/2/127

DO - 10.3847/0004-637X/825/2/127

M3 - Article

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SN - 0004-637X

VL - 825

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 127

ER -

High-contrast imaging of intermediate-mass giants with long-term radial velocity trends

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