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2 results on '"Mede, K."'

1. Orbital characterization of GJ1108A system, and comparison of dynamical mass with model-derived mass for resolved binaries

Author

Mede, K., Schlieder, J. E., Janson, M., Brandt, T. D., Hirano, T., Narita, N., Wisniewski, J., Biller, B., Bonnefoy, M., Carson, J. C., McElwain, M. W., Turner, E. L., Mayama, S., Akiyama, E., Uyama, T., Kudo, T., Hashimoto, J., Abe, Lyu, Brander, W., Egner, S., Feldt, M., Grady, C. A., Guyon, O., Henning, T., Hodapp, K. W., Knapp, G. R., Mono-Martin, A., Pyo, T., Serabyn, E., Suenaga, Takuya, Takahashi, Yasuhiro H., Takami, M., Thalmann, C., Mizuki, Toshiyuki, Kuzuhara, Masayuki, Yamada, Toru, Matsuo, Taro, Nakagawa, Takao, Kusakabe, Nobuhiko, Goto, Miwa, Hayano, Yutaka, Hayashi, Masahiko, Hayashi, Saeko S., Ishii, Miki, Iye, Masanori, Kandori, R., Kwon, Jungmi, Miyama, Shoken, Morino, Jun-ichi, Moro-Martin, A., Nishimura, Tetsuo, Suto, Hiroshi, Suzuki, Ryuji, Takato, Naruhisa, Terada, Hiroshi, Watanabe, Makoto, Takami, Hideki, Usuda, Tomonori, and Tamura, Motohide

Subjects
010504 meteorology & atmospheric sciences, Phase (waves), FOS: Physical sciences, Astrophysics, 01 natural sciences, stars: individual (GJ1108A), stars: low-mass, 0103 physical sciences, Binary system, Adaptive optics, 010303 astronomy & astrophysics, Solar and Stellar Astrophysics (astro-ph.SR), 0105 earth and related environmental sciences, Physics, Earth and Planetary Astrophysics (astro-ph.EP), Accretion (meteorology), Astronomy and Astrophysics, Astrometry, Mass comparison, binaries: visual, stars: imaging, Radial velocity, Stars, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Astrophysics::Earth and Planetary Astrophysics, binaries: spectroscopic, Astrophysics - Earth and Planetary Astrophysics
Abstract

著者人数: 58名（所属. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS): 水木, 敏幸; 山田, 亨; 中川, 貴雄; 權, 靜美), Accepted: 2018-08-13, 資料番号: SA1180204000

Published
2018
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2. Characterization of the gaseous companion �� Andromedae b: New Keck and LBTI high-contrast observations

Author

Bonnefoy, M., Currie, T., Marleau, G. -D., Schlieder, J. E., Wisniewski, J., Carson, J., Covey, K. R., Henning, T., Biller, B., Hinz, P., Klahr, H., Boyer, A. N. Marsh, Zimmerman, N., Janson, M., McElwain, M., Mordasini, C., Skemer, A., Bailey, V., Defr��re, D., Thalmann, C., Skrutskie, M., Allard, F., Homeier, D., Tamura, M., Feldt, M., Cumming, A., Grady, C., Brandner, W., Kandori, R., Kuzuhara, M., Fukagawa, M., Kwon, J., Kudo, T., Hashimoto, J., Kusakabe, N., Abe, L., Brandt, T., Egner, S., Guyon, O., Hayano, Y., Hayashi, M., Hayashi, S., Hodapp, K., Ishii, M., Iye, M., Knapp, G., Matsuo, T., Mede, K., Miyama, M., Morino, J. -I., Moro-Martin, A., Nishimura, T., Pyo, T., Serabyn, E., Suenaga, T., Suto, H., Suzuki, R., Takahashi, Takami, M., Takato, N., Terada, H., Tomono, D., Turner, E., Watanabe, M., Yamada, T., Takami, H., and Usuda, T.

Subjects
Earth and Planetary Astrophysics (astro-ph.EP), FOS: Physical sciences, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

We previously reported the direct detection of a low mass companion at a projected separation of 55+-2 AU around the B9 type star �� Andromedae. The properties of the system (mass ratio, separation) make it a benchmark for the understanding of the formation and evolution of gas giant planets and brown dwarfs on wide-orbits. We present new angular differential imaging (ADI) images of the Kappa Andromedae system at 2.146 (Ks), 3.776 (L'), 4.052 (NB 4.05) and 4.78 ��m (M') obtained with Keck/NIRC2 and LBTI/LMIRCam, as well as more accurate near-infrared photometry of the star with the MIMIR instrument. We derive a more accurate J = 15.86 +- 0.21, H = 14.95 +- 0.13, Ks = 14.32 +- 0.09 mag for �� And b. We redetect the companion in all our high contrast observations. We confirm previous contrasts obtained at Ks and L' band. We derive NB 4.05 = 13.0 +- 0.2 and M' = 13.3 +- 0.3 mag and estimate Log10(L/Lsun) = -3.76 +- 0.06. We build the 1-5 microns spectral energy distribution of the companion and compare it to seven PHOENIX-based atmospheric models in order to derive Teff = 1900+100-200 K. Models do not set constrains on the surface gravity. ``Hot-start" evolutionary models predict masses of 14+25-2 MJup based on the luminosity and temperature estimates, and considering a conservative age range for the system (30+120-10 Myr). ``warm-start" evolutionary tracks constrain the mass to M >= 11 MJup. Therefore, the mass of �� Andromedae b mostly falls in the brown-dwarf regime, due to remaining uncertainties in age and mass-luminosity models. According to the formation models, disk instability in a primordial disk could account for the position and a wide range of plausible masses of �� And b., 20 pages, 16 figures, accepted for publication in Astronomy and Astrophysics on August 6, 2013

Published
2013
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