A LIKELY CLOSE-IN LOW-MASS STELLAR COMPANION TO THE TRANSITIONAL DISK STAR HD 142527

被引：141

作者：

Biller, Beth ^{[1
]}

Lacour, Sylvestre ^{[2
]}

Juhasz, Attila ^{[3
]}

Benisty, Myriam ^{[1
]}

Chauvin, Gael ^{[1
,4
]}

Olofsson, Johan ^{[1
]}

Pott, Joerg-Uwe ^{[1
]}

Mueller, Andre ^{[1
]}

Sicilia-Aguilar, Aurora ^{[6
]}

Bonnefoy, Mickael ^{[1
]}

Tuthill, Peter ^{[5
]}

Thebault, Philippe ^{[2
]}

Henning, Thomas ^{[1
]}

Crida, Aurelien ^{[7
]}

机构：

[1] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[2] Univ Paris Diderot, UPMC, Observ Paris, LESIA,CNRS,UMR 8109, F-92195 Meudon, France

[3] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

[4] UJF Grenoble 1, CNRS, INSU, IPAG,UMR 5274, F-38041 Grenoble, France

[5] Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia

[6] Univ Autonoma Madrid, Fac Ciencias, Dept Fis Teor, E-28049 Madrid, Spain

[7] Univ Nice Sophia Antipolis, CNRS, Observ Cote Azur, Lab Lagrange,UMR 7293, F-06304 Nice 04, France

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2012年 / 753卷 / 02期

关键词：

brown dwarfs; circumstellar matter; planetary systems; stars:; emission-line; Be; stars: low-mass; HERBIG AE/BE STARS; MAIN-SEQUENCE STARS; CIRCUMBINARY DISCS; APERTURE MASKING; PLANET FORMATION; EVOLUTION; REGIONS; IMAGES; LINE;

D O I：

10.1088/2041-8205/753/2/L38

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

With the uniquely high contrast within 0 ''.1 (Delta mag(L') = 5-6.5 mag) available using Sparse Aperture Masking with NACO at Very Large Telescope, we detected asymmetry in the flux from the Herbig Fe star HD 142527 with a barycenter emission situated at a projected separation of 88 +/- 5 mas (12.8 +/- 1.5 AU at 145 pc) and flux ratios in H, K, and L' of 0.016 +/- 0.007, 0.012 +/- 0.008, and 0.0086 +/- 0.0011, respectively (3 sigma errors), relative to the primary star and disk. After extensive closure-phase modeling, we interpret this detection as a close-in, low-mass stellar companion with an estimated mass of similar to 0.1-0.4 M-circle dot. HD 142527 has a complex disk structure, with an inner gap imaged in both the near and mid-IR as well as a spiral feature in the outer disk in the near-IR. This newly detected low-mass stellar companion may provide a critical explanation of the observed disk structure.

引用

页数：5

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