THE GEMINI NICI PLANET-FINDING CAMPAIGN: DISCOVERY OF A CLOSE SUBSTELLAR COMPANION TO THE YOUNG DEBRIS DISK STAR PZ Tel

被引：82

作者：

Biller, Beth A. ^{[1
]}

Liu, Michael C. ^{[1
]}

Wahhaj, Zahed ^{[1
]}

Nielsen, Eric L. ^{[2
]}

Close, Laird M. ^{[2
]}

Dupuy, Trent J. ^{[1
]}

Hayward, Thomas L. ^{[3
]}

Burrows, Adam ^{[4
]}

Chun, Mark ^{[5
]}

Ftaclas, Christ ^{[1
]}

Clarke, Fraser ^{[6
]}

Hartung, Markus ^{[3
]}

Males, Jared ^{[2
]}

Reid, I. Neill ^{[7
]}

Shkolnik, Evgenya L. ^{[8
]}

Skemer, Andrew ^{[2
]}

Tecza, Matthias ^{[6
]}

Thatte, Niranjan ^{[6
]}

Alencar, Silvia H. P. ^{[9
]}

Artymowicz, Pawel ^{[10
]}

Boss, Alan ^{[8
]}

Dal Pino, Elisabete de Gouveia ^{[11
]}

Gregorio-Hetem, Jane ^{[11
]}

Ida, Shigeru ^{[12
]}

Kuchner, Marc J. ^{[13
]}

Lin, Douglas ^{[14
]}

Toomey, Douglas ^{[15
]}

机构：

[1] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[2] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[3] AURA, So Operat Ctr, Gemini Observ, La Serena, Chile

[4] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[5] Inst Astron, Hilo, HI 96720 USA

[6] Univ Oxford, Dept Astron, DWB, Oxford OX1 3RH, England

[7] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[8] Carnegie Inst Sci, Dept Terr Magnetism, Washington, DC 20015 USA

[9] Univ Fed Minas Gerais, ICEx, Dept Fis, BR-30270901 Belo Horizonte, MG, Brazil

[10] Univ Toronto Scarborough, Toronto, ON M1C 1A4, Canada

[11] Univ Sao Paulo, IAG USP, Dept Astron, BR-05508900 Sao Paulo, Brazil

[12] Tokyo Inst Technol, Meguro Ku, Tokyo 1528551, Japan

[13] NASA, Goddard Space Flight Ctr, Exoplanets & Stellar Astrophys Lab, Greenbelt, MD 20771 USA

[14] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA

[15] Mauna Kea Infrared LLC, Hilo, HI 96720 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 720卷 / 01期

关键词：

brown dwarfs; instrumentation: adaptive optics; planetary systems; planets and satellites: detection; stars: pre-main sequence; BROWN DWARF COMPANION; EXTRASOLAR GIANT PLANETS; INFRARED FILTER SET; LOW-MASS STARS; EVOLUTIONARY MODELS; ADAPTIVE OPTICS; T-DWARF; SPECTROSCOPY; PHOTOMETRY; TELESCOPE;

D O I：

10.1088/2041-8205/720/1/L82

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of a tight substellar companion to the young solar analog PZ Tel, a member of the beta Pic moving group observed with high-contrast adaptive optics imaging as part of the Gemini Near-Infrared Coronagraphic Imager Planet-Finding Campaign. The companion was detected at a projected separation of 16.4 +/- 1.0 AU (0.'' 33 +/- 0.'' 01) in 2009 April. Second-epoch observations in 2010 May demonstrate that the companion is physically associated and shows significant orbital motion. Monte Carlo modeling constrains the orbit of PZ Tel B to eccentricities >0.6. The near-IR colors of PZ Tel B indicate a spectral type of M7 +/- 2 and thus this object will be a new benchmark companion for studies of ultracool, low-gravity photospheres. Adopting an age of 12(-4)(+8) Myr for the system, we estimate a mass of 36 +/- 6 M-Jup based on the Lyon/DUSTY evolutionary models. PZ Tel B is one of the few young substellar companions directly imaged at orbital separations similar to those of giant planets in our own solar system. Additionally, the primary star PZ Tel A shows a 70 mu m emission excess, evidence for a significant quantity of circumstellar dust that has not been disrupted by the orbital motion of the companion.

引用

页码：L82 / L87

页数：6

共 49 条

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