Direct imaging search for extrasolar planets in the pleiades

Kodai Yamamoto, Taro Matsuo, Hiroshi Shibai, Yoichi Itoh, Mihoko Konishi, Jun Sudo, Ryoko Tanii, Misato Fukagawa, Takahiro Sumi, Tomoyuki Kudo, Jun Hashimoto, Nobuhiko Kusakabe, Lyu Abe, Wolfgang Brandner, Timothy D. Brandt, Joseph Carson, Thayne Currie, Sebastian E. Egner, Markus Feldt, Miwa Goto & 36 others Carol Grady, Olivier Guyon, Yutaka Hayano, Masahiko Hayashi, Saeko Hayashi, Thomas Henning, Klaus Hodapp, Miki Ishii, Masanori Iye, Markus Janson, Ryo Kandori, Gillian R. Knapp, Masayuki Kuzuhara, Jungmi Kwon, Mike Mcelwain, Shoken Miyama, Jun Ichi Morino, Amaya Moro-Martin, June Nishikawa, Tetsuo Nishimura, Tae Soo Pyo, Eugene Serabyn, Hiroshi Suto, Ryuji Suzuki, Michihiro Takami, Naruhisa Takato, Hiroshi Terada, Christian Thalmann, Daigo Tomono, Edwin L. Turner, John Wisniewski, Makoto Watanabe, Toru Yamada, Hideki Takami, Tomonori Usuda, Motohide Tamura

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

We carried out an imaging survey for extrasolar planets around stars in the Pleiades (125 Myr, 135 pc) in the H and KS bands using HiCIAO combined with adaptive optics, AO188, on the Subaru telescope. We found 13 companion candidates fainter than 14.5 mag in the H band around 9 stars. Five of these 13 were confirmed to be background stars by measurement of their proper motion. One was not found in the second epoch observation, and thus was not a background or companion object. One had multi-epoch images, but the precision of its proper motion was not sufficient to conclude whether it was a background object. Four other candidates are waiting for second-epoch observations to determine their proper motion. Finally, the remaining two were confirmed to be 60MJ brown dwarf companions orbiting around HD 23514 (G0) and HII 1348 (K5), respectively, as had been reported in previous studies. In our observations, the average detection limit for a point source was 20.3 mag in the H band beyond 1:005 from the central star. On the basis of this detection limit, we calculated the detection efficiency to be 90% for a planet with 6 to 12 Jovian masses and a semi-major axis of 50-1000 AU. For this reason we extrapolated the distribution of the planet mass and the semi-major axis derived from radial velocity observations, and adopted the planet evolution model Baraffe et al. (2003, A&A, 402, 701). Since there was no detection of a planet, we estimated the frequency of such planets to be less than 17.9% (2) around one star of the Pleiades cluster.

Original languageEnglish (US)
Article number90
JournalPublications of the Astronomical Society of Japan
Volume65
Issue number4
StatePublished - Aug 25 2013
Externally publishedYes

Fingerprint

extrasolar planets
planets
planet
proper motion
stars
time measurement
Pleiades cluster
adaptive optics
radial velocity
point sources
point source
Pleiades
telescopes
detection

Keywords

  • Brown dwarfs
  • Infrared: stars
  • Methods: statistical
  • Stars: low-mass
  • Stars: planetary systems
  • Techniques: high angular resolution

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Yamamoto, K., Matsuo, T., Shibai, H., Itoh, Y., Konishi, M., Sudo, J., ... Tamura, M. (2013). Direct imaging search for extrasolar planets in the pleiades. Publications of the Astronomical Society of Japan, 65(4), [90].

Direct imaging search for extrasolar planets in the pleiades. / Yamamoto, Kodai; Matsuo, Taro; Shibai, Hiroshi; Itoh, Yoichi; Konishi, Mihoko; Sudo, Jun; Tanii, Ryoko; Fukagawa, Misato; Sumi, Takahiro; Kudo, Tomoyuki; Hashimoto, Jun; Kusakabe, Nobuhiko; Abe, Lyu; Brandner, Wolfgang; Brandt, Timothy D.; Carson, Joseph; Currie, Thayne; Egner, Sebastian E.; Feldt, Markus; Goto, Miwa; Grady, Carol; Guyon, Olivier; Hayano, Yutaka; Hayashi, Masahiko; Hayashi, Saeko; Henning, Thomas; Hodapp, Klaus; Ishii, Miki; Iye, Masanori; Janson, Markus; Kandori, Ryo; Knapp, Gillian R.; Kuzuhara, Masayuki; Kwon, Jungmi; Mcelwain, Mike; Miyama, Shoken; Morino, Jun Ichi; Moro-Martin, Amaya; Nishikawa, June; Nishimura, Tetsuo; Pyo, Tae Soo; Serabyn, Eugene; Suto, Hiroshi; Suzuki, Ryuji; Takami, Michihiro; Takato, Naruhisa; Terada, Hiroshi; Thalmann, Christian; Tomono, Daigo; Turner, Edwin L.; Wisniewski, John; Watanabe, Makoto; Yamada, Toru; Takami, Hideki; Usuda, Tomonori; Tamura, Motohide.

In: Publications of the Astronomical Society of Japan, Vol. 65, No. 4, 90, 25.08.2013.

Research output: Contribution to journalArticle

Yamamoto, K, Matsuo, T, Shibai, H, Itoh, Y, Konishi, M, Sudo, J, Tanii, R, Fukagawa, M, Sumi, T, Kudo, T, Hashimoto, J, Kusakabe, N, Abe, L, Brandner, W, Brandt, TD, Carson, J, Currie, T, Egner, SE, Feldt, M, Goto, M, Grady, C, Guyon, O, Hayano, Y, Hayashi, M, Hayashi, S, Henning, T, Hodapp, K, Ishii, M, Iye, M, Janson, M, Kandori, R, Knapp, GR, Kuzuhara, M, Kwon, J, Mcelwain, M, Miyama, S, Morino, JI, Moro-Martin, A, Nishikawa, J, Nishimura, T, Pyo, TS, Serabyn, E, Suto, H, Suzuki, R, Takami, M, Takato, N, Terada, H, Thalmann, C, Tomono, D, Turner, EL, Wisniewski, J, Watanabe, M, Yamada, T, Takami, H, Usuda, T & Tamura, M 2013, 'Direct imaging search for extrasolar planets in the pleiades', Publications of the Astronomical Society of Japan, vol. 65, no. 4, 90.
Yamamoto K, Matsuo T, Shibai H, Itoh Y, Konishi M, Sudo J et al. Direct imaging search for extrasolar planets in the pleiades. Publications of the Astronomical Society of Japan. 2013 Aug 25;65(4). 90.
Yamamoto, Kodai ; Matsuo, Taro ; Shibai, Hiroshi ; Itoh, Yoichi ; Konishi, Mihoko ; Sudo, Jun ; Tanii, Ryoko ; Fukagawa, Misato ; Sumi, Takahiro ; Kudo, Tomoyuki ; Hashimoto, Jun ; Kusakabe, Nobuhiko ; Abe, Lyu ; Brandner, Wolfgang ; Brandt, Timothy D. ; Carson, Joseph ; Currie, Thayne ; Egner, Sebastian E. ; Feldt, Markus ; Goto, Miwa ; Grady, Carol ; Guyon, Olivier ; Hayano, Yutaka ; Hayashi, Masahiko ; Hayashi, Saeko ; Henning, Thomas ; Hodapp, Klaus ; Ishii, Miki ; Iye, Masanori ; Janson, Markus ; Kandori, Ryo ; Knapp, Gillian R. ; Kuzuhara, Masayuki ; Kwon, Jungmi ; Mcelwain, Mike ; Miyama, Shoken ; Morino, Jun Ichi ; Moro-Martin, Amaya ; Nishikawa, June ; Nishimura, Tetsuo ; Pyo, Tae Soo ; Serabyn, Eugene ; Suto, Hiroshi ; Suzuki, Ryuji ; Takami, Michihiro ; Takato, Naruhisa ; Terada, Hiroshi ; Thalmann, Christian ; Tomono, Daigo ; Turner, Edwin L. ; Wisniewski, John ; Watanabe, Makoto ; Yamada, Toru ; Takami, Hideki ; Usuda, Tomonori ; Tamura, Motohide. / Direct imaging search for extrasolar planets in the pleiades. In: Publications of the Astronomical Society of Japan. 2013 ; Vol. 65, No. 4.
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abstract = "We carried out an imaging survey for extrasolar planets around stars in the Pleiades (125 Myr, 135 pc) in the H and KS bands using HiCIAO combined with adaptive optics, AO188, on the Subaru telescope. We found 13 companion candidates fainter than 14.5 mag in the H band around 9 stars. Five of these 13 were confirmed to be background stars by measurement of their proper motion. One was not found in the second epoch observation, and thus was not a background or companion object. One had multi-epoch images, but the precision of its proper motion was not sufficient to conclude whether it was a background object. Four other candidates are waiting for second-epoch observations to determine their proper motion. Finally, the remaining two were confirmed to be 60MJ brown dwarf companions orbiting around HD 23514 (G0) and HII 1348 (K5), respectively, as had been reported in previous studies. In our observations, the average detection limit for a point source was 20.3 mag in the H band beyond 1:005 from the central star. On the basis of this detection limit, we calculated the detection efficiency to be 90{\%} for a planet with 6 to 12 Jovian masses and a semi-major axis of 50-1000 AU. For this reason we extrapolated the distribution of the planet mass and the semi-major axis derived from radial velocity observations, and adopted the planet evolution model Baraffe et al. (2003, A&A, 402, 701). Since there was no detection of a planet, we estimated the frequency of such planets to be less than 17.9{\%} (2) around one star of the Pleiades cluster.",
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T1 - Direct imaging search for extrasolar planets in the pleiades

AU - Yamamoto, Kodai

AU - Matsuo, Taro

AU - Shibai, Hiroshi

AU - Itoh, Yoichi

AU - Konishi, Mihoko

AU - Sudo, Jun

AU - Tanii, Ryoko

AU - Fukagawa, Misato

AU - Sumi, Takahiro

AU - Kudo, Tomoyuki

AU - Hashimoto, Jun

AU - Kusakabe, Nobuhiko

AU - Abe, Lyu

AU - Brandner, Wolfgang

AU - Brandt, Timothy D.

AU - Carson, Joseph

AU - Currie, Thayne

AU - Egner, Sebastian E.

AU - Feldt, Markus

AU - Goto, Miwa

AU - Grady, Carol

AU - Guyon, Olivier

AU - Hayano, Yutaka

AU - Hayashi, Masahiko

AU - Hayashi, Saeko

AU - Henning, Thomas

AU - Hodapp, Klaus

AU - Ishii, Miki

AU - Iye, Masanori

AU - Janson, Markus

AU - Kandori, Ryo

AU - Knapp, Gillian R.

AU - Kuzuhara, Masayuki

AU - Kwon, Jungmi

AU - Mcelwain, Mike

AU - Miyama, Shoken

AU - Morino, Jun Ichi

AU - Moro-Martin, Amaya

AU - Nishikawa, June

AU - Nishimura, Tetsuo

AU - Pyo, Tae Soo

AU - Serabyn, Eugene

AU - Suto, Hiroshi

AU - Suzuki, Ryuji

AU - Takami, Michihiro

AU - Takato, Naruhisa

AU - Terada, Hiroshi

AU - Thalmann, Christian

AU - Tomono, Daigo

AU - Turner, Edwin L.

AU - Wisniewski, John

AU - Watanabe, Makoto

AU - Yamada, Toru

AU - Takami, Hideki

AU - Usuda, Tomonori

AU - Tamura, Motohide

PY - 2013/8/25

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KW - Brown dwarfs

KW - Infrared: stars

KW - Methods: statistical

KW - Stars: low-mass

KW - Stars: planetary systems

KW - Techniques: high angular resolution

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