VERY LOW-MASS STELLAR AND SUBSTELLAR COMPANIONS TO SOLAR-LIKE STARS FROM MARVELS. VI. A GIANT PLANET AND A BROWN DWARF CANDIDATE IN A CLOSE BINARY SYSTEM HD 87646

被引：6

作者：

Ma, Bo ^{[1
]}

Ge, Jian ^{[1
]}

Wolszczan, Alex ^{[2
]}

Muterspaugh, Matthew W. ^{[3
,4
]}

Lee, Brian ^{[1
]}

Henry, Gregory W. ^{[4
]}

Schneider, Donald P. ^{[2
,5
]}

Martin, Eduardo L. ^{[6
]}

Niedzielski, Andrzej ^{[7
]}

Xie, Jiwei ^{[1
,8
,9
]}

Fleming, Scott W. ^{[10
,11
]}

Thomas, Neil ^{[1
]}

Williamson, Michael ^{[3
,4
]}

Zhu, Zhaohuan ^{[12
]}

Agol, Eric ^{[13
]}

Bizyaev, Dmitry ^{[14
,15
]}

da Costa, Luiz Nicolaci ^{[16
,17
]}

Jiang, Peng ^{[1
,18
]}

Martinez Fiorenzano, A. F. ^{[19
]}

Gonzalez Hernandez, Jonay I. ^{[20
,21
]}

Guo, Pengcheng ^{[1
]}

Grieves, Nolan ^{[1
]}

Li, Rui ^{[1
]}

Liu, Jane ^{[1
]}

Mahadevan, Suvrath ^{[2
,5
]}

Mazeh, Tsevi ^{[22
]}

Duy Cuong Nguyen ^{[23
]}

Paegert, Martin ^{[24
]}

Sithajan, Sirinrat ^{[1
]}

Stassun, Keivan ^{[24
]}

Thirupathi, Sivarani ^{[1
]}

van Eyken, Julian C. ^{[25
]}

Wan, Xiaoke ^{[1
]}

Wang, Ji ^{[26
]}

Wisniewski, John P. ^{[27
]}

Zhao, Bo ^{[1
]}

Zucker, Shay ^{[28
]}

机构：

[1] Univ Florida, Dept Astron, Bryant Space Sci Ctr 211, Gainesville, FL 32611 USA

[2] Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA

[3] Tennessee State Univ, Coll Life & Phys Sci, Dept Math Sci, Boswell Sci Hall, Nashville, TN 37209 USA

[4] Tennessee State Univ, Ctr Excellence Informat Syst Engn & Management, 3500 John A Merritt Blvd,Box 9501, Nashville, TN 37209 USA

[5] Penn State Univ, Ctr Exoplanets & Habitable Worlds, University Pk, PA 16802 USA

[6] Ctr Astrobiol INTA CSIC, Carretera Ajalvir Km 4, E-28550 Madrid, Spain

[7] Nicolaus Copernicus Univ Torun, Torun Ctr Astron, Grudziadzka 5, PL-87100 Torun, Poland

[8] Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China

[9] Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210093, Jiangsu, Peoples R China

[10] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[11] Comp Sci Corp, 3700 San Martin Dr, Baltimore, MD 21218 USA

[12] Princeton Univ, Dept Astrophys, Princeton, NJ 08544 USA

[13] Univ Washington, Dept Astron, Box 351580, Seattle, WA 98195 USA

[14] Apache Point Observ, POB 59, Sunspot, NM 88349 USA

[15] New Mexico State Univ, POB 59, Sunspot, NM 88349 USA

[16] Lab Interinst E Astron LIneA, BR-20921400 Rio De Janeiro, RJ, Brazil

[17] Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil

[18] Univ Sci & Technol China, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China

[19] Fdn Galileo Galilei INAF, Rambla Jose Ana Fernandez Perez, E-738712 Tenerife, Spain

[20] Inst Astrofis Canarias, E-38205 Tenerife, Spain

[21] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain

[22] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

[23] Univ Toronto, Dunlap Inst Astron & Astrophys, Toronto, ON M5S 3H4, Canada

[24] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[25] UC Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[26] Yale Univ, Dept Astron, New Haven, CT 06511 USA

[27] Univ Oklahoma, HL Dodge Dept Phys & Astron, 440 W Brooks St, Norman, OK 73019 USA

[28] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Dept Geosci, IL-6997801 Tel Aviv, Israel

来源：

ASTRONOMICAL JOURNAL | 2016年 / 152卷 / 05期

基金：

美国国家科学基金会; 美国安德鲁·梅隆基金会;

关键词：

binaries: close; brown dwarfs; planetary systems; EXTERNALLY DISPERSED INTERFEROMETER; CORALIE ECHELLE SPECTROGRAPH; FIXED-DELAY INTERFEROMETRY; MULTI-ORDER TODCOR; METAL-RICH STARS; SPECKLE INTERFEROMETRY; RADIAL-VELOCITIES; NO PLANET; F STAR; EXOPLANET;

D O I：

10.3847/0004-6256/152/5/112

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the detections of a giant planet (MARVELS-7b) and a brown dwarf (BD) candidate (MARVELS-7c) around the primary star in the close binary system, HD 87646. To the best of our knowledge, it is the first close binary system with more than one substellar circumprimary companion that has been. discovered. The detection of this giant planet was accomplished using the first multi-object Doppler instrument (KeckET) at the Sloan Digital Sky Survey (SDSS) telescope. Subsequent radial velocity observations using the Exoplanet Tracker at the. Kitt Peak National Observatory, the High Resolution Spectrograph at the. Hobby Eberley telescope, the "Classic" spectrograph at the Automatic Spectroscopic Telescope at the. Fairborn Observatory, and MARVELS from SDSS-III confirmed this giant planet discovery and revealed the existence of a long-period BD in this binary. HD. 87646 is a close binary with a separation of similar to 22 au between the two stars, estimated using the Hipparcos catalog. and our newly acquired AO image from PALAO on the 200 inch Hale Telescope at Palomar. The primary star in the binary, HD 87646A, has T-eff = 5770 +/- 80 K, log g = 4.1 +/- 0.1, and [Fe/H] = -0.17 +/- 0.08. The derived minimum masses of the two substellar companions of HD 87646A are 12.4 +/- 0.7 M-Jup and 57.0 +/- 3.7 M-Jup. The periods are 13.481 +/- 0.001 days and 674 +/- 4 days and the measured eccentricities are 0.05 +/- 0.02 and 0.50 +/- 0.02 respectively. Our dynamical simulations show that the system is stable if the binary orbit has a large semimajor axis and a low eccentricity, which can be verified with future astrometry observations.

引用

页数：12

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