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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

Journal article published in 2012 by Beth Biller ORCID, Sylvestre Lacour, Attila Juhász, Myriam Benisty, Gael Chauvin, Johan Olofsson, Jörg-Uwe Pott, André Müller, Aurora Sicilia-Aguilar ORCID, Mickaël Bonnefoy, Peter Tuthill, Philippe Thebault, Thomas Henning, Aurelien Crida ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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.