SEEDS DIRECT IMAGING of the RV-DETECTED COMPANION to V450 ANDROMEDAE, and CHARACTERIZATION of the SYSTEM

K. G. Hełminiak; M. Kuzuhara; K. Mede; T. D. Brandt; R. Kandori; T. Suenaga; N. Kusakabe; N. Narita; J. C. Carson; T. Currie; T. Kudo; J. Hashimoto; L. Abe; E. Akiyama; W. Brandner; M. Feldt; M. Goto; C. A. Grady; O. Guyon; Y. Hayano; M. Hayashi; S. S. Hayashi; T. Henning; K. W. Hodapp; M. Ishii; M. Iye; M. Janson; G. R. Knapp; J. Kwon; T. Matsuo; M. W. McElwain; S. Miyama; J. I. Morino; A. Moro-Martin; T. Nishimura; T. Ryu; T. S. Pyo; E. Serabyn; H. Suto; R. Suzuki; Y. H. Takahashi; M. Takami; N. Takato; H. Terada; C. Thalmann; E. L. Turner; M. Watanabe; J. Wisniewski; T. Yamada; H. Takami; T. Usuda; M. Tamura

doi:10.3847/0004-637X/832/1/33

SEEDS DIRECT IMAGING of the RV-DETECTED COMPANION to V450 ANDROMEDAE, and CHARACTERIZATION of the SYSTEM

K. G. Hełminiak, M. Kuzuhara, K. Mede, T. D. Brandt, R. Kandori, T. Suenaga, N. Kusakabe, N. Narita, J. C. Carson, T. Currie, T. Kudo, J. Hashimoto, L. Abe, E. Akiyama, W. Brandner, M. Feldt, M. Goto, C. A. Grady, O. Guyon, Y. HayanoM. Hayashi, S. S. Hayashi, T. Henning, K. W. Hodapp, M. Ishii, M. Iye, M. Janson, G. R. Knapp, J. Kwon, T. Matsuo, M. W. McElwain, S. Miyama, J. I. Morino, A. Moro-Martin, T. Nishimura, T. Ryu, T. S. Pyo, E. Serabyn, H. Suto, R. Suzuki, Y. H. Takahashi, M. Takami, N. Takato, H. Terada, C. Thalmann, E. L. Turner, M. Watanabe, J. Wisniewski, T. Yamada, H. Takami, T. Usuda, M. Tamura

Astrophysical Sciences

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Abstract

We report the direct imaging detection of a low-mass companion to a young, moderately active star V450 And, that was previously identified with the radial velocity (RV) method. The companion was found in high-contrast images obtained with the Subaru Telescope equipped with the HiCIAO camera and AO188 adaptive optics system. From the public ELODIE and SOPHIE archives we extracted available high-resolution spectra and RV measurements, along with RVs from the Lick planet search program. We combined our multi-epoch astrometry with these archival, partially unpublished RVs, and found that the companion is a low-mass star, not a brown dwarf, as previously suggested. We found the best-fitting dynamical masses to be m1 =1.141^+0.037 _-0.091and m2= 0.279^+0.023 _-0.020M⊙. We also performed spectral analysis of the SOPHIE spectra with the iSpec code. Hipparcos time-series photometry shows a periodicity of P = 5.743 day, which is also seen in the SOPHIE spectra as an RV modulation of the star A. We interpret it as being caused by spots on the stellar surface, and the star to be rotating with the given period. From the rotation and level of activity, we found that the system is 380 ⁺²²⁰ _-100Myr old, consistent with an isochrone analysis (220⁺²¹²⁰ _-90Myr). This work may serve as a test case for future studies of lowmass stars, brown dwarfs, and exoplanets by combination of RV and direct imaging data.

Original language	English (US)
Article number	33
Journal	Astrophysical Journal
Volume	832
Issue number	1
DOIs	https://doi.org/10.3847/0004-637X/832/1/33
State	Published - Nov 20 2016

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

binaries: spectroscopic
binaries: visual
stars: imaging
stars: individual (V450 And)
stars: low-mass

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10.3847/0004-637X/832/1/33

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Hełminiak, K. G., Kuzuhara, M., Mede, K., Brandt, T. D., Kandori, R., Suenaga, T., Kusakabe, N., Narita, N., Carson, J. C., Currie, T., Kudo, T., Hashimoto, J., Abe, L., Akiyama, E., Brandner, W., Feldt, M., Goto, M., Grady, C. A., Guyon, O., ... Tamura, M. (2016). SEEDS DIRECT IMAGING of the RV-DETECTED COMPANION to V450 ANDROMEDAE, and CHARACTERIZATION of the SYSTEM. Astrophysical Journal, 832(1), Article 33. https://doi.org/10.3847/0004-637X/832/1/33

@article{7688f5a8e7924a9cb1eb46b9b8ca5f44,

title = "SEEDS DIRECT IMAGING of the RV-DETECTED COMPANION to V450 ANDROMEDAE, and CHARACTERIZATION of the SYSTEM",

abstract = "We report the direct imaging detection of a low-mass companion to a young, moderately active star V450 And, that was previously identified with the radial velocity (RV) method. The companion was found in high-contrast images obtained with the Subaru Telescope equipped with the HiCIAO camera and AO188 adaptive optics system. From the public ELODIE and SOPHIE archives we extracted available high-resolution spectra and RV measurements, along with RVs from the Lick planet search program. We combined our multi-epoch astrometry with these archival, partially unpublished RVs, and found that the companion is a low-mass star, not a brown dwarf, as previously suggested. We found the best-fitting dynamical masses to be m1 =1.141+0.037 -0.091and m2= 0.279+0.023 -0.020M⊙. We also performed spectral analysis of the SOPHIE spectra with the iSpec code. Hipparcos time-series photometry shows a periodicity of P = 5.743 day, which is also seen in the SOPHIE spectra as an RV modulation of the star A. We interpret it as being caused by spots on the stellar surface, and the star to be rotating with the given period. From the rotation and level of activity, we found that the system is 380 +220 -100Myr old, consistent with an isochrone analysis (220+2120 -90Myr). This work may serve as a test case for future studies of lowmass stars, brown dwarfs, and exoplanets by combination of RV and direct imaging data.",

keywords = "binaries: spectroscopic, binaries: visual, stars: imaging, stars: individual (V450 And), stars: low-mass",

author = "He{\l}miniak, {K. G.} and M. Kuzuhara and K. Mede and Brandt, {T. D.} and R. Kandori and T. Suenaga and N. Kusakabe and N. Narita and Carson, {J. C.} and T. Currie and T. Kudo and J. Hashimoto and L. Abe and E. Akiyama and W. Brandner and M. Feldt and M. Goto and Grady, {C. A.} and O. Guyon and Y. Hayano and M. Hayashi and Hayashi, {S. S.} and T. Henning and Hodapp, {K. W.} and M. Ishii and M. Iye and M. Janson and Knapp, {G. R.} and J. Kwon and T. Matsuo and McElwain, {M. W.} and S. Miyama and Morino, {J. I.} and A. Moro-Martin and T. Nishimura and T. Ryu and Pyo, {T. S.} and E. Serabyn and H. Suto and R. Suzuki and Takahashi, {Y. H.} and M. Takami and N. Takato and H. Terada and C. Thalmann and Turner, {E. L.} and M. Watanabe and J. Wisniewski and T. Yamada and H. Takami and T. Usuda and M. Tamura",

year = "2016",

month = nov,

day = "20",

doi = "10.3847/0004-637X/832/1/33",

language = "English (US)",

volume = "832",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1",

}

Hełminiak, KG, Kuzuhara, M, Mede, K, Brandt, TD, Kandori, R, Suenaga, T, Kusakabe, N, Narita, N, Carson, JC, Currie, T, Kudo, T, Hashimoto, J, Abe, L, Akiyama, E, Brandner, W, Feldt, M, Goto, M, Grady, CA, Guyon, O, Hayano, Y, Hayashi, M, Hayashi, SS, Henning, T, Hodapp, KW, Ishii, M, Iye, M, Janson, M, Knapp, GR, Kwon, J, Matsuo, T, McElwain, MW, Miyama, S, Morino, JI, Moro-Martin, A, Nishimura, T, Ryu, T, Pyo, TS, Serabyn, E, Suto, H, Suzuki, R, Takahashi, YH, Takami, M, Takato, N, Terada, H, Thalmann, C, Turner, EL, Watanabe, M, Wisniewski, J, Yamada, T, Takami, H, Usuda, T & Tamura, M 2016, 'SEEDS DIRECT IMAGING of the RV-DETECTED COMPANION to V450 ANDROMEDAE, and CHARACTERIZATION of the SYSTEM', Astrophysical Journal, vol. 832, no. 1, 33. https://doi.org/10.3847/0004-637X/832/1/33

TY - JOUR

T1 - SEEDS DIRECT IMAGING of the RV-DETECTED COMPANION to V450 ANDROMEDAE, and CHARACTERIZATION of the SYSTEM

AU - Hełminiak, K. G.

AU - Kuzuhara, M.

AU - Mede, K.

AU - Brandt, T. D.

AU - Kandori, R.

AU - Suenaga, T.

AU - Kusakabe, N.

AU - Narita, N.

AU - Carson, J. C.

AU - Currie, T.

AU - Kudo, T.

AU - Hashimoto, J.

AU - Abe, L.

AU - Akiyama, E.

AU - Brandner, W.

AU - Feldt, M.

AU - Goto, M.

AU - Grady, C. A.

AU - Guyon, O.

AU - Hayano, Y.

AU - Hayashi, M.

AU - Hayashi, S. S.

AU - Henning, T.

AU - Hodapp, K. W.

AU - Ishii, M.

AU - Iye, M.

AU - Janson, M.

AU - Knapp, G. R.

AU - Kwon, J.

AU - Matsuo, T.

AU - McElwain, M. W.

AU - Miyama, S.

AU - Morino, J. I.

AU - Moro-Martin, A.

AU - Nishimura, T.

AU - Ryu, T.

AU - Pyo, T. S.

AU - Serabyn, E.

AU - Suto, H.

AU - Suzuki, R.

AU - Takahashi, Y. H.

AU - Takami, M.

AU - Takato, N.

AU - Terada, H.

AU - Thalmann, C.

AU - Turner, E. L.

AU - Watanabe, M.

AU - Wisniewski, J.

AU - Yamada, T.

AU - Takami, H.

AU - Usuda, T.

AU - Tamura, M.

PY - 2016/11/20

Y1 - 2016/11/20

N2 - We report the direct imaging detection of a low-mass companion to a young, moderately active star V450 And, that was previously identified with the radial velocity (RV) method. The companion was found in high-contrast images obtained with the Subaru Telescope equipped with the HiCIAO camera and AO188 adaptive optics system. From the public ELODIE and SOPHIE archives we extracted available high-resolution spectra and RV measurements, along with RVs from the Lick planet search program. We combined our multi-epoch astrometry with these archival, partially unpublished RVs, and found that the companion is a low-mass star, not a brown dwarf, as previously suggested. We found the best-fitting dynamical masses to be m1 =1.141+0.037 -0.091and m2= 0.279+0.023 -0.020M⊙. We also performed spectral analysis of the SOPHIE spectra with the iSpec code. Hipparcos time-series photometry shows a periodicity of P = 5.743 day, which is also seen in the SOPHIE spectra as an RV modulation of the star A. We interpret it as being caused by spots on the stellar surface, and the star to be rotating with the given period. From the rotation and level of activity, we found that the system is 380 +220 -100Myr old, consistent with an isochrone analysis (220+2120 -90Myr). This work may serve as a test case for future studies of lowmass stars, brown dwarfs, and exoplanets by combination of RV and direct imaging data.

AB - We report the direct imaging detection of a low-mass companion to a young, moderately active star V450 And, that was previously identified with the radial velocity (RV) method. The companion was found in high-contrast images obtained with the Subaru Telescope equipped with the HiCIAO camera and AO188 adaptive optics system. From the public ELODIE and SOPHIE archives we extracted available high-resolution spectra and RV measurements, along with RVs from the Lick planet search program. We combined our multi-epoch astrometry with these archival, partially unpublished RVs, and found that the companion is a low-mass star, not a brown dwarf, as previously suggested. We found the best-fitting dynamical masses to be m1 =1.141+0.037 -0.091and m2= 0.279+0.023 -0.020M⊙. We also performed spectral analysis of the SOPHIE spectra with the iSpec code. Hipparcos time-series photometry shows a periodicity of P = 5.743 day, which is also seen in the SOPHIE spectra as an RV modulation of the star A. We interpret it as being caused by spots on the stellar surface, and the star to be rotating with the given period. From the rotation and level of activity, we found that the system is 380 +220 -100Myr old, consistent with an isochrone analysis (220+2120 -90Myr). This work may serve as a test case for future studies of lowmass stars, brown dwarfs, and exoplanets by combination of RV and direct imaging data.

KW - binaries: spectroscopic

KW - binaries: visual

KW - stars: imaging

KW - stars: individual (V450 And)

KW - stars: low-mass

UR - http://www.scopus.com/inward/record.url?scp=84996551932&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84996551932&partnerID=8YFLogxK

U2 - 10.3847/0004-637X/832/1/33

DO - 10.3847/0004-637X/832/1/33

M3 - Article

AN - SCOPUS:84996551932

SN - 0004-637X

VL - 832

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 33

ER -

SEEDS DIRECT IMAGING of the RV-DETECTED COMPANION to V450 ANDROMEDAE, and CHARACTERIZATION of the SYSTEM

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All Science Journal Classification (ASJC) codes

Keywords

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