Published in
American Astronomical Society, Astrophysical Journal Letters, 2(753), p. L38, 2012
DOI: 10.1088/2041-8205/753/2/l38
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A Likely Close-In Low-Mass Stellar Companion to the Transitional Disk Star HD 142527
,
Sylvestre Lacour,
Attila Juhász,
Myriam Benisty,
Gael Chauvin,
Johan Olofsson,
Jörg-Uwe Pott,
André Müller,
Aurora Sicilia-Aguilar ,
Mickaël Bonnefoy,
Peter Tuthill,
Philippe Thebault,
Thomas Henning,
Aurelien Crida
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Abstract
The Astrophysical Journal Letters 753.2 (2012): L38 reproduced by permission of the AAS ; With the uniquely high contrast within 0''.1 (Δmag(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 145pc) and flux ratios in H, K, and L′ of 0.016 ± 0.007, 0.012 ± 0.008, and 0.0086 ± 0.0011, respectively (3σ 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 ∼0.1-0.4 M⊙. 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.