A CANDIDATE YOUNG MASSIVE PLANET IN ORBIT AROUND THE CLASSICAL T TAURI STAR CI TAU

被引:84
作者
Johns-Krull, Christopher M. [1 ]
McLane, Jacob N. [2 ,3 ]
Prato, L. [2 ]
Crockett, Christopher J. [4 ]
Jaffe, Daniel T. [5 ]
Hartigan, Patrick M. [1 ]
Beichman, Charles A. [6 ,7 ]
Mahmud, Naved I. [1 ]
Chen, Wei [1 ]
Skiff, B. A. [2 ]
Cauley, P. Wilson [1 ,8 ]
Jones, Joshua A. [1 ]
Mace, G. N. [5 ]
机构
[1] Rice Univ, Dept Phys & Astron, MS-108,6100 Main St, Houston, TX 77005 USA
[2] Lowell Observ, 1400 West Mars Hill Rd, Flagstaff, AZ 86001 USA
[3] No Arizona Univ, Dept Phys & Astron, S San Francisco St, Flagstaff, AZ 86011 USA
[4] Sci News, 1719 N St NW, Washington, DC 20036 USA
[5] Univ Texas Austin, Dept Astron, RL Moore Hall, Austin, TX 78712 USA
[6] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
[7] CALTECH, NASA Exoplanet Sci Inst NExScI, 770 S Wilson Ave, Pasadena, CA 91125 USA
[8] Wesleyan Univ, Dept Astron, 45 Wyllys Ave, Middletown, CT 06459 USA
基金
美国国家科学基金会; 美国国家航空航天局;
关键词
planets and satellites: formation; stars: individual (CI Tau); stars: low-mass; stars: pre-main sequence; star spots; techniques: radial velocities; RADIAL-VELOCITY VARIABILITY; SUB-STELLAR COMPANION; LIGHT CURVES; MAGNETOSPHERIC ACCRETION; BROWN DWARF; CSI; 2264; PHOTOMETRIC VARIABILITY; MAGNETIZED STARS; DISK ACCRETION; ALL-SKY;
D O I
10.3847/0004-637X/826/2/206
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The similar to 2 Myr old classical T Tauri star CI Tau shows periodic variability in its radial velocity (RV) variations measured at infrared (IR) and optical wavelengths. We find that these observations are consistent with a massive planet in a similar to 9 day period orbit. These results are based on 71 IR RV measurements of this system obtained over five years, and on 26 optical RV measurements obtained over nine years. CI Tau was also observed photometrically in the optical on 34 nights over similar to one month in 2012. The optical RV data alone are inadequate to identify an orbital period, likely the result of star spot and activity-induced noise for this relatively small data set. The infrared RV measurements reveal significant periodicity at similar to 9 days. In addition, the full set of optical and IR RV measurements taken together phase coherently and with equal amplitudes to the similar to 9 day period. Periodic RV signals can in principle be produced by cool spots, hotspots, and reflection of the stellar spectrum off the inner disk, in addition to resulting from a planetary companion. We have considered each of these and find the planet hypothesis most consistent with the data. The RV amplitude yields an M sin i of similar to 8.1 M-Jup; in conjunction with a 1.3 mm continuum emission measurement of the circumstellar disk inclination from the literature, we find a planet mass of similar to 11.3 M-Jup, assuming alignment of the planetary orbit with the disk.
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页数:22
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